tag:blogger.com,1999:blog-81141814293630867472024-03-05T04:43:17.195+00:00Hacking CiscoMusing and Ranting of a Techno RebelJhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comBlogger289125tag:blogger.com,1999:blog-8114181429363086747.post-52921210458175302772019-10-02T19:00:00.002+01:002022-11-30T07:08:19.031+00:00Cisco: Intermediate Level<div style="margin: 0px;">
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</div><div style="margin: 0px; text-align: center;"><span style="color: #6aa84f;"><span style="font-size: large;"><b><span face=""trebuchet ms" , sans-serif" style="text-align: left;"><a href="https://www.youtube.com/@curiouscatclub5812">Watch Video Tutorials on Youtube</a><br /></span></b></span></span></div><div style="margin: 0px;"><span style="color: #6aa84f;"><span style="font-size: large;"><b><span face=""trebuchet ms" , sans-serif" style="text-align: left;"> <br /></span></b></span></span></div><div style="margin: 0px;"><span style="color: #6aa84f;"><span style="font-size: large;"><b><span face=""trebuchet ms" , sans-serif" style="text-align: left;">Intermediate Lab Categories:</span></b></span></span><br />
<span style="font-size: small;"><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html#ospf" style="font-family: "Trebuchet MS", sans-serif; text-align: left;">OSPF</a><span face=""trebuchet ms" , sans-serif" style="text-align: left;"> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html#eigrp" style="font-family: "Trebuchet MS", sans-serif; text-align: left;">EIGRP</a><span face=""trebuchet ms" , sans-serif" style="text-align: left;"> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html#rip" style="font-family: "Trebuchet MS", sans-serif; text-align: left;">RIPv2</a><span face=""trebuchet ms" , sans-serif" style="text-align: left;"> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html#bgp" style="font-family: "Trebuchet MS", sans-serif; text-align: left;">BGP</a><span face=""trebuchet ms" , sans-serif" style="text-align: left;"> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html#multicast" style="font-family: "Trebuchet MS", sans-serif; text-align: left;">Multicast</a><span face=""trebuchet ms" , sans-serif" style="text-align: left;"> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html#mpls" style="font-family: "Trebuchet MS", sans-serif; text-align: left;">MPLS</a><span face=""trebuchet ms" , sans-serif" style="text-align: left;"> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html#ipv6" style="font-family: "Trebuchet MS", sans-serif; text-align: left;">IPv6</a><span face=""trebuchet ms" , sans-serif" style="text-align: left;"> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html#security" style="font-family: "Trebuchet MS", sans-serif; text-align: left;">Security</a><span face=""trebuchet ms" , sans-serif" style="text-align: left;"> | </span></span></div>
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<span face=""trebuchet ms" , sans-serif" style="font-size: small;"><b>*** <a href="http://www.blogger.com/blogger.g?blogID=8114181429363086747" name="ospf">OSPF</a> ****</b></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/02/lab-1-ospf-point-to-point-mode.html">Lab 001 - OSPF Point-to-Point Mode</a> </span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/02/lab-1-ospf-point-to-point-mode-solution.html">Lab 001 - OSPF Point-to-Point Mode - Solution</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-2-ospf-broadcast-networks.html">Lab 002 - OSPF in Broadcast Networks</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-3-ospf-in-nbma-networks.html">Lab 003 - OSPF in NBMA Networks</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-4-ospf-in-point-to-multipoint.html">Lab 004 - OSPF in Point-to-Multipoint</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-5-ospf-in-point-to-multipoint-non.html">Lab 005 - OSPF in Point-to-Multipoint Non-broadcast</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-6-ospf-multi-area-network.html">Lab 006 - OSPF Multi-Area Network</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-7-ospf-authentication.html">Lab 007 - OSPF Authentication</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-8-ospf-filtering-with-distribute.html">Lab 008 - OSPF Filtering with Distribute-List</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lesson-9-ospf-filtering-with-route-map.html">Lab 009 - OSPF Filtering with Route-Map</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-10-ospf-filtering-with-distance.html">Lab 010 - OSPF Filtering with Distance</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-11-ospf-filtering-with-area-range.html">Lab 011 - OSPF Filtering with Area Range</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-12-ospf-filtering-with-filter-list.html">Lab 012 - OSPF Filtering with Area Filter-List</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-13-ospf-lsa-flood-filtering.html">Lab 013 - OSPF LSA Flood Filtering</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-14-ospf-stub-area.html">Lab 014 - OSPF Stub Area</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lesson-15-ospf-totally-stubby-area.html">Lab 015 - OSPF Totally Stubby Area</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-16-ospf-nssa-area-lsa7-to-5.html">Lab 016 - OSPF NSSA Area LSA7-to-5 Translation</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-17-ospf-nssa-totally-stub-area.html">Lab 017 - OSPF NSSA Totally Stub Area</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-18-ospf-fa-suppression-in.html">Lab 018 - OSPF FA Suppression in Translated Type-5 LSAs</a><br /><a href="http://hackingcisco.blogspot.com/2011/02/lab-19-ospf-external-prefix-filtering.html">Lab 019 - OSPF External Prefix Filtering</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-20-ospf-path-influencing-using-cost.html">Lab 020 - OSPF Path Influencing Using Cost</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-21-ospf-path-influencing-using.html">Lab 021 - OSPF Path Influencing Using Bandwidth</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-22-ospf-path-influencing-using.html">Lab 022 - OSPF Path Influencing Using Neighbor Cost</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-23-ospf-changing-auto-cost.html">Lab 023 - OSPF Changing Auto-Cost Reference-Bandwidth</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-24-ospf-virtual-link-example-1.html">Lab 024 - OSPF Virtual Link Example 1</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-25-ospf-virtual-link-example-2.html">Lab 025 - OSPF Virtual Link Example 2</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-26-ospf-virtual-link-example-3.html">Lab 026 - OSPF Virtual Link Example 3</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-27-ospf-path-selection-with-transit.html">Lab 027 - OSPF Path Selection with Transit Capability</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-28-ospf-stub-router-advertisement.html">Lab 028 - OSPF Stub Router Advertisement</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-29-ospf-reducing-lsa-flooding.html">Lab 029 - OSPF Reducing LSA Flooding</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-30-ospf-on-demand-circuits.html">Lab 030 - OSPF On Demand Circuits</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-31-ospf-default-routing.html">Lab 031 - OSPF Default Routing</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-32-ospf-conditional-default-routing.html">Lab 032 - OSPF Conditional Default Routing</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-33-ospf-conditional-default-routing.html">Lab 033 - OSPF Conditional Default Routing with IP SLA</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-34-ospf-discard-route.html">Lab 034 - OSPF Discard Route</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-35-ospf-resource-management.html">Lab 035 - OSPF Resource Management</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-36-ospf-timers.html">Lab 036 - OSPF Timers</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-37-ospf-other-features.html">Lab 037 - OSPF Other Features</a></span></div>
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<b><span face=""trebuchet ms" , sans-serif">**** <a href="http://www.blogger.com/blogger.g?blogID=8114181429363086747" name="eigrp">EIGRP</a> ****</span></b></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/03/lab-38-eigrp-nbma-network.html">Lab 038 - EIGRP NBMA Network</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-39-eigrp-summarization.html">Lab 039 - EIGRP Automatic Summarization</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-40-eigrp-manual-summarization.html">Lab 040 - EIGRP Manual Summarization</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-41-eigrp-summarization-with-default.html">Lab 041 - EIGRP Summarization with Default Route</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-42-summarization-with-floating.html">Lab 042 - EIGRP Summarization with a Floating Default Route</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-43-summarization-with.html">Lab 043 - EIGRP Summarization with Administrative Distance 255</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-44-selective-summarization-with.html">Lab 044 - EIGRP Selective Summarization with a Leak Map</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-45-eigrp-filtering-with-standard.html">Lab 045 - EIGRP Filtering with Standard ACL</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-46-eigrp-filtering-with-extended.html">Lab 046 - EIGRP Filtering with Extended ACL</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-47-eigrp-filtering-with-prefix-list.html">Lab 047 - EIGRP Filtering with Prefix-List</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-48-eigrp-filtering-with-route-map.html">Lab 048 - EIGRP Filtering with Route-Map</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-49-eigrp-filtering-with.html">Lab 049 - EIGRP Filtering with Administrative Distance</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-50-eigrp-filtering-with-passive.html">Lab 050 - EIGRP Filtering with Passive-Interface</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-51-eigrp-filtering-with-offset-list.html">Lab 051 - EIGRP Filtering with Offset-List</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-52-eigrp-filtering-with-stub.html">Lab 052 - EIGRP Filtering with Stub Routing</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-53-eigrp-filtering-with-stub.html">Lab 053 - EIGRP Filtering with Stub Routing and Leak Map</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-54-eigrp-default-route.html">Lab 054 - EIGRP Default Route Advertisement</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-55-eigrp-unequal-cost-load.html">Lab 055 - EIGRP Unequal Cost Load Balancing</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab56-eigrp-traffic-engineering-with.html">Lab 056 - EIGRP Traffic Engineering with the Delay</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-57-frame-relay-packet-pacing.html">Lab 057 - Frame-Relay Packet Pacing</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-58-eigrp-authentication.html">Lab 058 - EIGRP Authentication</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-59-eigrp-router-id.html">Lab 059 - EIGRP Router ID</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-60-eigrp-unicast-communication.html">Lab 060 - EIGRP Unicast Communication</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-61-eigrp-timers.html">Lab 061 - EIGRP Timers</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-62-eigrp-other-features.html">Lab 062 - EIGRP Other Features</a></span></div>
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<b><span face=""trebuchet ms" , sans-serif">**** <a href="http://www.blogger.com/blogger.g?blogID=8114181429363086747" name="rip">RIPv2</a> ****</span></b></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/03/lab-63-ripv2-split-horizon.html">Lab 063 - RIPv2 Split-Horizon</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-64-ripv2-default-routing.html">Lab 064 - RIPv2 Default Routing</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-65-ripv2-conditional-default.html">Lab 065 - RIPv2 Conditional Default Routing Advertisement</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-66-ripv2-conditional-default.html">Lab 066 - RIPv2 Conditional Default Routing with IP SLA</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-67-ripv2-send-and-receive-versions.html">Lab 067 - RIPv2 Send and Receive Versions</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-68-ripv2-filtering-with-standard.html">Lab 068 - RIPv2 Filtering with Standard ACL</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-69-ripv2-filtering-with-extended.html">Lab 069 - RIPv2 Filtering with Extended ACL</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-70-ripv2-filtering-with-passive.html">Lab 070 - RIPv2 Filtering with Passive-Interface</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-71-ripv2-filtering-with-ad.html">Lab 071 - RIPv2 Filtering with AD</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-72-ripv2-metric-manipulation-with.html">Lab 072 - RIPv2 Metric Manipulation with Offset-List</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-73-ripv2-auto-summary.html">Lab 073 - RIPv2 Auto-Summary</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-74-ripv2-manual-summarization.html">Lab 074 - RIPv2 Manual Summarization</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-75-ripv2-broadcast-updates.html">Lab 075 - RIPv2 Broadcast Updates</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-76-ripv2-unicast-updates.html">Lab 076 - RIPv2 Unicast Updates</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-77-ripv2-triggered-updates.html">Lab 077 - RIPv2 Triggered Updates</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-78-ripv2-source-update-validation.html">Lab 078 - RIPv2 Source Update Validation</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-79-ripv2-authentication.html">Lab 079 - RIPv2 Authentication</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-80-ripv2-timers.html">Lab 080 - RIPv2 Timers</a></span></div>
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<b><span face=""trebuchet ms" , sans-serif">**** <a href="http://www.blogger.com/blogger.g?blogID=8114181429363086747" name="bgp">BGP</a> ****</span></b></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/03/lab-81-bgp-internal-session-ibgp.html">Lab 081 - BGP Internal Session (IBGP)</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-82-bgp-external-session-ebgp-and.html">Lab 082 - BGP External Session (EBGP) and Advertisements</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-83-bgp-synchronization.html">Lab 083 - BGP Synchronization</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-84-bgp-next-hop-on-broadcast-and.html">Lab 084 - BGP Next-Hop on Broadcast and NBMA Networks</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-85-ebgp-multihop.html">Lab 085 - EBGP Multihop</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-86-bgp-disable-connected-check.html">Lab 086 - BGP Disable-Connected-Check</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-87-bgp-authentication.html">Lab 087 - BGP Authentication</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-88-bgp-auto-summary.html">Lab 088 - BGP Auto-Summary</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-89-non-bgp-transit-with-igp.html">Lab 089 - non-BGP Transit with IGP Redistribution</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-90-non-bgp-transit-with-gre-tunnel.html">Lab 090 - non-BGP Transit with GRE Tunnel</a><br /><a href="http://hackingcisco.blogspot.com/2011/03/lab-91-non-bgp-transit-with-mpls.html">Lab 091 - non-BGP Transit with MPLS</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-92-bgp-next-hop-modification.html">Lab 092 - BGP Next-Hop Modification</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-93-ibgp-route-reflector.html">Lab 093 - IBGP Route-Reflector</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-94-bgp-confederations.html">Lab 094 - BGP Confederations</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-95-bgp-path-selection-using-weight.html">Lab 095 - BGP Path Selection using Weight</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-96-bgp-path-selection-using-local.html">Lab 096 - BGP Path Selection using Local Preference</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-97-bgp-path-selection-using-med.html">Lab 097 - BGP Path Selection using MED</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-98-bgp-path-selection-always.html">Lab 098 - BGP Path Selection Always-Compare-MED</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-99-bgp-path-selection-using-as.html">Lab 099 - BGP Path Selection using AS-Prepending</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-100-bgp-hidden-feature-bestpath-as.html">Lab 100 - BGP Hidden Feature BESTPATH AS-PATH IGNORE</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-101-bgp-path-selection-using-origin.html">Lab 101 - BGP Path Selection Using Origin</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-102-bgp-path-selection-using.html">Lab 102 - BGP Path Selection using DMZLINK-BW</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-103-bgp-path-selection-using-maxas.html">Lab 103 - BGP Path Selection using MAXAS-LIMIT</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-104-bgp-filtering-using-standard.html">Lab 104 - BGP Filtering using Standard ACL</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-105-bgp-filtering-using-extended.html">Lab 105 - BGP Filtering using Extended ACL</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-106-bgp-filtering-using-prefix-list.html">Lab 106 - BGP Filtering using Prefix-List</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-107-bgp-aggregation-using-ip-route.html">Lab 107 - BGP Aggregation using IP Route Null0</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-108-bgp-aggregation-using-aggregate.html">Lab 108 - BGP Aggregation using Aggregate-Address</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-109-bgp-aggregation-with-unsuppress.html">Lab 109 - BGP Aggregation with Unsuppress-Map</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-110-bgp-aggregation-with-suppress.html">Lab 100 - BGP Aggregation with Suppress-Map</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-111-bgp-aggregation-with-as-set.html">Lab 111 - BGP Aggregation with AS-SET</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-112-bgp-aggregation-with-attribute.html">Lab 112 - BGP Aggregation with ATTRIBUTE-MAP</a><br /><a href="http://hackingcisco.blogspot.com/2011/04/lab-113-bgp-aggregation-with-advertise.html">Lab 113 - BGP Aggregation with ADVERTISE-MAP</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-114-bgp-communities-no-export.html">Lab 114 - BGP Communities - NO-EXPORT</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-115-bgp-communities-no-advertise.html">Lab 115 - BGP Communities - NO-ADVERTISE</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-116-bgp-communities-local-as.html">Lab 116 - BGP Communities - LOCAL-AS</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-117-bgp-community-policy.html">Lab 117 - BGP Community Policy</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-118-bgp-conditional-route.html">Lab 118 - BGP Conditional Route Advertisement Part 1</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-119-bgp-conditional-route-injection.html">Lab 119 - BGP Conditional Route Injection</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-120-bgp-default-route-advertisement.html">Lab 120 - BGP Default Route Advertisement</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-121-bgp-conditional-route.html">Lab 121 - BGP Conditional Route Advertisement Part 2</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-122-bgp-as-path-access-list.html">Lab 122 - BGP AS-Path Access-List</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-123-bgp-local-as.html">Lab 123 - BGP Local-AS</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-124-bgp-local-as-no-prepend.html">Lab 124 - BGP Local-AS No-prepend</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-125-bgp-local-as-no-prepend-replace.html">Lab 125 - BGP Local-AS No-prepend Replace-AS</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-126-bgp-local-as-no-prepend-dual-as.html">Lab 126 - BGP Local-AS No-prepend Dual-AS</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-127-bgp-allowas-in.html">Lab 127 - BGP Allowas-In</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-128-bgp-remove-private-as.html">Lab 128 - BGP Remove-Private-AS</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-129-bgp-next-hop-using-next-hop.html">Lab 129 - BGP Next-Hop using Next-Hop-Self</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-130-bgp-next-hop-using-route-map.html">Lab 130 - BGP Next-Hop using Route-map</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-131-bgp-next-hop-using.html">Lab 131 - BGP Next-Hop using Redistribution into IGP</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-132-bgp-dampening.html">Lab 132 - BGP Dampening</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-133-bgp-dampening-using-route-map.html">Lab 133 - BGP Dampening using Route-Map</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-134-bgp-backdoor.html">Lab 134 - BGP Backdoor</a><br /><a href="http://hackingcisco.blogspot.com/2011/05/lab-135-bgp-ttl-security.html">Lab 135 - BGP TTL Security</a></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/05/lab-136-bgp-peer-groups.html">Lab 136 - BGP Peer Groups</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/05/lab-137-bgp-peer-templates.html">Lab 137 - BGP Peer Templates</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/05/lab-138-bgp-orf.html">Lab 138 - BGP ORF</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/05/lab-139-bgp-soft-reconfiguration.html">Lab 139 - BGP Soft Reconfiguration</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/05/lab-140-bgp-fast-fallover.html">Lab 140 - BGP Fast Fallover</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/05/lab-141-bgp-next-hop-address-tracking.html">Lab 141 - BGP Next-Hop Address Tracking</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/05/lab-142-bgp-timers.html">Lab 142 - BGP Timers</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><br /></span></div>
<div style="background-color: #f3f3f3; text-align: center;">
<span face=""trebuchet ms" , sans-serif" style="font-size: small;"><b>**** <a href="http://www.blogger.com/blogger.g?blogID=8114181429363086747" name="multicast">Multicast</a> ****</b></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><br /></span></div>
<div>
<a href="http://hackingcisco.blogspot.com/2011/05/lab-143-pim-dense-mode.html"><span face=""trebuchet ms" , sans-serif">Lab 143 - PIM Dense-Mode</span></a></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/05/lab-144-pim-sparse-mode.html">Lab 144 - PIM Sparse-Mode</a></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-145-rpf-failure.html">Lab 145 - PIM RPF Failure</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-145-pim-rpf-failure-2.html">Lab 146 - PIM RPF Failure 2</a></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-147-cisco-auto-rp.html">Lab 147 - Cisco Auto-RP</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-148-cisco-auto-rp-multple-rps.html">Lab 148 - Cisco Auto-RP Multiple RPs</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-149-rp-filtering.html">Lab 149 - Auto-RP Filtering</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-150-auto-rp-listener.html">Lab 150 - Auto-RP Listener</a></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-151-pim-dr-election.html">Lab 151 - PIM RP Election</a></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-152-pim-accept-rp.html">Lab 152 - PIM Accept RP</a></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-153-pim-accept-register.html">Lab 153 - PIM Accept Register</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-154-auto-rp-scope-limiting.html">Lab 154 - Auto-RP Scope Limiting</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-155-multicast-traffic-boundary.html">Lab 155 - Multicast Traffic Boundary</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/06/lab-156-pim-nbma.html">Lab 156 - PIM NBMA</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/11/lab-157-pim-bootstrap-router.html" target="_blank">Lab 157 - PIM Bootstrap Router</a></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/11/lab-158-bsr-with-multiple-rps.html" target="_blank">Lab 158 - BSR with Multiple RPs</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/11/lab-159-bsr-propagation-filtering.html" target="_blank">Lab 159 - BSR Propagation Filtering</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/11/lab-160-multicast-stub-routing.html" target="_blank">Lab 160 - Multicast Stub Routing</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><span style="color: black;"><a href="http://hackingcisco.blogspot.com/2011/11/lab-161-source-specific-multicast.html" target="_blank">Lab 161 - Source Specific Multicast</a></span> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/11/lab-162-anycast-rp.html" target="_blank">Lab 162 - Anycast RP</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/11/lab-163-igmp-filtering.html" target="_blank">Lab 163 - IGMP Filtering</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/11/lab-164-igmp-timers.html" target="_blank">Lab 164 - IGMP Timers</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.com/2011/11/lab-165-multicast-rate-limiting.html" target="_blank">Lab 165 - Multicast Rate Limiting</a> </span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><span style="color: black;"><a href="http://hackingcisco.blogspot.com/2011/12/lab-166-multicast-helper-map.html" target="_blank">Lab 166 - Multicast Helper-Map</a></span><br /><span style="color: black;"><a href="http://hackingcisco.blogspot.com/2011/12/lab-167-pim-bidir.html" target="_blank">Lab 167 - PIM BiDir</a></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><br /></span></div>
<div style="background-color: #f3f3f3; text-align: center;">
<span face=""trebuchet ms" , sans-serif" style="font-size: small;"><b>**** <a href="http://www.blogger.com/blogger.g?blogID=8114181429363086747" name="mpls">MPLS</a> ****</b></span></div>
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<span face=""trebuchet ms" , sans-serif"><br /></span></div>
<div>
<a href="http://hackingcisco.blogspot.ie/2012/06/lab-168-creating-mpls-topology.html" target="_blank"><span face=""trebuchet ms" , sans-serif">Lab 168 - Creating MPLS Topology</span></a></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/06/lab-169-mpls-basic-configuration.html" target="_blank">Lab 169 - Configuring Basic MPLS</a></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/06/lab-170-multiprotocol-bgp.html" target="_blank">Lab 170 - Multiprotocol BGP</a> </span></div>
<div>
<a href="http://hackingcisco.blogspot.ie/2012/07/lab-171-conditional-label-distribution.html" target="_blank"><span face=""trebuchet ms" , sans-serif">Lab 171 - Conditional Label Distribution</span></a></div>
<div>
<a href="http://hackingcisco.blogspot.ie/2012/07/lab-172-vrf-lite.html" target="_blank"><span face=""trebuchet ms" , sans-serif">Lab 172 - VRF Lite</span></a></div>
<div>
<a href="http://hackingcisco.blogspot.ie/2012/07/lab-173-ce-to-pe-ripv2-configuration.html" target="_blank"><span face=""trebuchet ms" , sans-serif">Lab 173 - CE-to-PE RIPv2 Configuration</span></a></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/07/lab-174-mpls-vpn-using-eigrp.html" target="_blank">Lab 174 - MPLS VPN using EIGRP</a></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/07/lab-175-mpls-vpn-using-ospf.html" target="_blank">Lab 175 - MPLS VPN using OSPF</a></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/07/lab-176-mpls-vpn-using-bgp.html" target="_blank">Lab 176 - MPLS VPN using BGP</a> </span></div>
<span face=""trebuchet ms" , sans-serif" style="background-color: white;"><a href="http://hackingcisco.blogspot.co.uk/2012/07/lab-177-mpls-overlapping-vpns.html" style="background-color: white;" target="_blank">Lab 177 - MPLS Overlapping VPNs</a></span><br />
<span face=""trebuchet ms" , sans-serif" style="text-align: -webkit-auto;"><a href="http://hackingcisco.blogspot.ie/2012/08/lab-178-mpls-common-services-vpn.html" target="_blank">Lab 178 - MPLS Common Services VPN</a></span><br />
<span face=""trebuchet ms" , sans-serif" style="text-align: -webkit-auto;"><a href="http://hackingcisco.blogspot.ie/2012/08/lab-179-mpls-internet-access-via-global.html" target="_blank">Lab 179 - MPLS Internet Access (via global routing table)</a></span><br />
<span face=""trebuchet ms" , sans-serif" style="text-align: -webkit-auto;"><a href="http://hackingcisco.blogspot.ie/2012/08/lab-180-mpls-internet-access-as-vpn.html" target="_blank">Lab 180 - MPLS Internet Access (as VPN)</a></span><br />
<span style="text-align: -webkit-auto;"><span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/08/lab-181-mpls-bgp-cost-community.html" target="_blank">Lab 181 - MPLS BGP Cost Community</a></span></span><br />
<span face=""trebuchet ms" , sans-serif" style="text-align: -webkit-auto;"><a href="http://hackingcisco.blogspot.ie/2012/08/lab-182-eigrp-soo.html" target="_blank">Lab 182 - EIGRP SoO</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/08/lab-183-atom-vlan-mode.html" target="_blank">Lab 183 - AToM Vlan Mode</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/08/lab-184-l2tpv3.html" target="_blank">Lab 184 - L2TPv3</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/08/lab-185-mpls-l2-vpn.html" target="_blank">Lab 185 - MPLS L2 VPN</a></span><br />
<div>
<div>
<span face=""trebuchet ms" , sans-serif"><br /></span></div>
<div style="background-color: #f3f3f3; text-align: center;">
<span face=""trebuchet ms" , sans-serif" style="font-size: small;"><b>**** <a href="http://www.blogger.com/blogger.g?blogID=8114181429363086747" name="ipv6">IPv6</a> ****</b></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><br /></span></div>
<div>
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/09/lab-186-creating-ipv6-topology.html" target="_blank">Lab 186 - Creating IPv6 Topology</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/09/lab-187-ipv6-on-frame-relay-links.html" target="_blank">Lab 187 - IPv6 On Frame-Relay Links</a></span><br />
<a href="http://hackingcisco.blogspot.ie/2012/09/lab-189-ripng-basic-configuration.html" style="font-family: "Trebuchet MS", sans-serif;" target="_blank">Lab 188 - RIPng Basic Configuration</a><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/09/lab-189-ipv6-address-auto-configuration.html" target="_blank">Lab 189 - IPv6 Address Auto-Configuration</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/09/lab-190-ripng-prefix-summarization.html" target="_blank">Lab 190 - IPv6 Prefix Summarization</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-191-ripng-on-nbma-links.html" target="_blank">Lab 191 - RIPng on NBMA Links</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-192-ripng-protocol-redistribution.html" target="_blank">Lab 192 - RIPng Protocol Redistribution</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-193-ripng-default-route-propagation.html" target="_blank">Lab 193 - RIPng Default Route Propagation</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-194-ripng-prefix-filtering.html" target="_blank">Lab 194 - RIPng Prefix Filtering</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-195-ripng-path-selection-using.html" target="_blank">Lab 195 - RIPng Path Selection Using Metric</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-196-eigrpv6-nbma-network.html" target="_blank">Lab 196 - EIGRPv6 NBMA Network</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-197-eigrpv6-default-route-1.html" target="_blank">Lab 197 - EIGRPv6 Default Route 1</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-198-eigrpv6-default-route-2.html" target="_blank">Lab 198 - EIGRPv6 Default Route 2</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-199-eigrpv6-prefix-summarization.html" target="_blank">Lab 199 - EIGRPv6 Prefix Summarization</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-200-eigrpv6-authentication.html" target="_blank">Lab 200 - EIGRPv6 Authentication</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-201-eigrpv6-unequal-load-balance.html" target="_blank">Lab 201 - EIGRPv6 Unequal Load Balance</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-202-ospfv3-in-nbma-networks.html" target="_blank">Lab 202 - OSPFv3 in NBMA Networks</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-203-ospfv3-path-influencing.html" target="_blank">Lab 203 - OSPFv3 Path Influencing</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/10/lab-204-ospfv3-virtual-link.html" target="_blank">Lab 204 - OSPFv3 Virtual Link</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/11/lab-205-ospfv3-prefix-summarization.html">Lab 205 - OSPFv3 Prefix Summarization</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/11/lab-206-ipv6-protocol-redistribution.html">Lab 206 - IPv6 Protocol Redistribution</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/11/lab-207-ipv6-access-control-list.html">Lab 207 - IPv6 Access Control List</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2012/11/lab-208-ipv6-nat-pt.html">Lab 208 - IPv6 NAT-PT</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/01/lab-208-ipv6-over-ipv4-using-gre-tunnel.html">Lab 209 - IPv6 over IPv4 Using GRE Tunnel</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/01/lab-210-ipv6-over-ipv4-using-ipv6ip.html">Lab 210 - IPv6 over IPv4 Using IPv6IP Tunnel</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/02/lab-211-automatic-6to4-tunnel.html">Lab 211 - IPv6 Automatic 6to4 Tunnel</a> </span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/02/lab-212-ipv6-mp-bgp.html">Lab 212 - IPv6 MP-BGP</a> </span><br />
<br />
<div>
<div>
<span face=""trebuchet ms" , sans-serif"></span><br /></div>
<div style="background-color: #f3f3f3; text-align: center;">
<span face=""trebuchet ms" , sans-serif" style="font-size: small;"><b>**** <a href="http://www.blogger.com/blogger.g?blogID=8114181429363086747" name="security">SECURITY</a> ****</b></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/02/lab-213-standard-acl.html">Lab 213 - Standard ACL</a></span><br />
<a href="http://hackingcisco.blogspot.ie/2013/02/lab-214-extended-acl.html"><span face=""trebuchet ms" , sans-serif">Lab 214 - Extended ACL</span></a><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/02/lab-215-extended-acl-established.html">Lab 215 - Extended ACL Established</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/03/lab-216-acl-matching-even-network.html">Lab 216 - ACL Matching Even Network Numbers</a> </span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/03/lab-217-acl-complex-matching.html">Lab 217 - ACL Complex Matching</a> </span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/03/lab-218-dynamic-acl-lock-and-key.html">Lab 218 - Dynamic ACL (Lock-and-Key)</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/03/lab-219-reflexive-acl.html">Lab 219 - Reflexive ACL</a> </span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/04/lab-220-tcp-intercept.html">Lab 220 - TCP Intercept</a></span><br />
<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/04/lab-221-cbac.html">Lab 221 - CBAC</a></span><br />
<a href="http://hackingcisco.blogspot.ie/2013/04/lab-222-zone-based-firewall-part-1.html">Lab 222 - Zone-bases Firewall Part 1</a></div>
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<span face=""trebuchet ms" , sans-serif">In order to use OSPF (re-written) labs, you must download the topology and initial configurations as per links below.</span></div>
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<span face=""trebuchet ms" , sans-serif"><b>GNS3 Topology</b></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="https://docs.google.com/file/d/0BwE5C95tpjZOSnpMUkcwZEMwU3c/edit?usp=sharing">https://docs.google.com/file/d/0BwE5C95tpjZOSnpMUkcwZEMwU3c/edit?usp=sharing</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><br /></span></div>
<div class="separator" style="clear: both;">
<span face=""trebuchet ms" , sans-serif"><b>OSPF Labs Initial Configuration</b></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOcnY4d2hXcTREeDA/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOcnY4d2hXcTREeDA/edit?usp=sharing</a></span></div>
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<br /></div>
<div class="separator" style="clear: both; text-align: left;">
<b style="color: #6aa84f; font-family: "Trebuchet MS", sans-serif;"><span style="font-size: large;">OSPF Labs</span><span style="font-size: x-small;"> (re-written)</span></b></div>
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<span style="color: #0b5394;"><span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/07/ospf-point-to-point-mode.html">OSPF Point-to-Point Mode</a></span></span></div>
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<span style="color: #0b5394;"><span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/07/ospf-broadcast-mode.html">OSPF Broadcast Mode</a></span></span></div>
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<span style="color: #0b5394;"><span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/07/ospf-non-broadcast-mode.html">OSPF NBMA Mode</a></span></span></div>
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<span style="color: #0b5394;"><span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/07/ospf-dr-configuration.html">OSPF DR Configuration</a></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/07/ospf-multipoint-mode.html"><span style="color: #0b5394;">OSPF Point<span style="color: #0b5394;">-to-</span>Multipoint</span></a></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span style="color: #0b5394;"><span style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/07/ospf-point-to-multipoint-non-broadcast.html">OSPF Point-to-Multipoint Non-Broadcast</a> </span></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span style="color: #0b5394;"><span style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/07/ospf-simple-password-authentication.html">OSPF Simple Password Authentication</a> </span></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span style="color: #0b5394;"><span style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/07/ospf-md5-authentication.html">OSPF MD5 Authentication</a> </span></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span style="color: #0b5394;"><span style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/07/ospf-password-rollover.html">OSPF Password Rollover</a> </span></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span style="color: #0b5394;"><span style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/07/ospf-null-authentication.html">OSPF Null Authentication</a></span></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span style="color: #0b5394;"><span style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/08/ospf-network-loopback.html">OSPF Network Loopback</a> </span></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span style="color: #0b5394;"><span style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/09/ospf-filtering-using-distribute-list.html">OSPF Filtering Using Distribute List with Prefix-List</a></span></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span style="color: #0b5394;"><span style="color: #0b5394;"><span face=""trebuchet ms" , sans-serif" style="color: #0b5394;"><span style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/09/ospf-filtering-using-distribute-list_13.html">OSPF Filtering Using Distribute List with ACL</a></span></span></span></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span face=""trebuchet ms" , sans-serif" style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/09/ospf-filtering-using-distribute-list_17.html">OSPF Filtering Using Distribute-List with Route-Map</a></span><span face=""trebuchet ms" , sans-serif" style="color: #0b5394;"> </span></span></div>
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<span face=""trebuchet ms" , sans-serif"><span face=""trebuchet ms" , sans-serif" style="color: #0b5394;"><a href="http://hackingcisco.blogspot.ie/2013/09/ospf-filtering-using-administrative.html">OSPF Filtering Using Administrative Distance</a></span></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/09/ospf-inter-area-filtering-using-area.html">OSPF Inter-Area Filtering Using Area Range</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2013/09/ospf-inter-area-filtering-using-area_19.html">OSPF Inter-Area Filtering using Area Filter-List</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-lsa-flood-filtering.html">OSPF LSA Flood Filtering</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-demand-circuit.html">OSPF Demand Circuit</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-flooding-reduction.html">OSPF Flooding Reduction</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-default-route.html">OSPF Default Route</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-summarization-discard-route.html">OSPF Summarization - Discard Route</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-conditional-default-routing.html">OSPF Conditional Default Routing</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-conditional-default-routing-using.html">OSPF Conditional Default Routing Using IP SLA</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-cost.html">OSPF Path Selection with Cost</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-bandwidth.html">OSPF Path Selection with Bandwidth</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-neighbor-cost.html">OSPF Path Selection with Neighbor Cost</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-auto-cost.html">OSPF Path Selection with Auto-Cost</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.co.uk/2014/02/ospf-virtual-link.html">OSPF Virtual Link</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link-repairing-partitioned.html">OSPF Virtual Link - Repairing Partitioned Area 0</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link-complex-scenario.html">OSPF Virtual Link - Complex Scenario</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-stub-area-filtering.html">OSPF Stub Area Filtering</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-totally-stubby-area-filtering.html">OSPF Totally Stubby Area Filtering</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-nssa-filtering.html">OSPF NSSA Filtering</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-not-so-totally-stubby-area.html">OSPF Not-So-Totally-Stubby Area</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-gre-tunnel-over-nssastub-area.html">OSPF GRE Tunnel over NSSA/Stub Area</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-stub-network-traffic-engineering.html">OSPF Stub Network Traffic Engineering</a></span></div>
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<span face=""trebuchet ms" , sans-serif"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-nssa-area-lsa7-to-5-translator.html">OSPF NSSA Area LSA7-to-5 Translator Election</a></span></div>
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<span face=""trebuchet ms" , sans-serif" style="color: #0b5394; font-size: x-small;">© </span><a href="mailto:linuxed.jr@gmail.com" style="color: #0b5394; font-family: "Trebuchet MS", sans-serif; font-size: small;">Jaro</a><span face=""trebuchet ms" , sans-serif" style="color: #0b5394; font-size: x-small;"> 2013 </span></div>
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Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-90592360934872471892014-07-19T14:16:00.000+01:002015-10-08T18:03:37.248+01:00Welcome to Free CCNA and CCNP Tutorials<div style="text-align: center;">
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<span style="font-family: Verdana, sans-serif;"><a href="http://ciscoiseasy.blogspot.ie/">Main Page</a> | <a href="http://ciscoiseasy.blogspot.ie/2011/05/blogs-content-list.html">CCNA Theory Lessons</a> | </span><a href="http://ciscoiseasy.blogspot.ie/2015/10/learn-by-doing-challenges.html" style="font-family: Verdana, sans-serif;">CCNA Learn By Doing</a><span style="font-family: Verdana, sans-serif;"> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html" style="font-family: Verdana, sans-serif;">CCNP Labs</a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">If you wish to contact me, you will find my email address in the '</span><a href="http://www.blogger.com/profile/14613178990982384153" style="font-family: 'Trebuchet MS', sans-serif;">About me</a><span style="font-family: 'Trebuchet MS', sans-serif;">' section.</span><br />
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<a href="http://ciscoiseasy.blogspot.ie/2014/07/iou-forbidden-fruit.html" style="font-family: 'Trebuchet MS', sans-serif;">IOU Forbidden Fruit</a><br />
<span style="font-family: Trebuchet MS, sans-serif; font-size: x-small;">Article about IOU aka IOS on Unix which is Cisco router/switch lightweight emulator.</span><br />
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<span style="font-family: Trebuchet MS, sans-serif;">The below topology will only work with <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">the labs</a> I have been re-writing currently (the ones marked 're-written' in the title).</span><br />
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<span style="color: #6aa84f; font-family: Trebuchet MS, sans-serif; font-size: large;"><b><a href="https://docs.google.com/file/d/0BwE5C95tpjZOSnpMUkcwZEMwU3c/edit?usp=sharing">DOWNLOAD GNS3 TOPOLOGY</a></b></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">The new revamped topology I plan to use for all labs looks like shown below.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 1 - LAN Wiring.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg88X8010oU48slGXAXzN9Q44aINJVmgC3A4mdV7Jcceh0-Uai2NfRmWCDC6pEmS8RnG4Wt-BuzyL33HXVtYKd1H4N25Cd0CiI4eKv4hs1uNuG9fa4IG_GA9VQqFnpRWPzJgodjihncFOfi/s1600/LAN.Wiring.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="278" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg88X8010oU48slGXAXzN9Q44aINJVmgC3A4mdV7Jcceh0-Uai2NfRmWCDC6pEmS8RnG4Wt-BuzyL33HXVtYKd1H4N25Cd0CiI4eKv4hs1uNuG9fa4IG_GA9VQqFnpRWPzJgodjihncFOfi/s400/LAN.Wiring.png" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - WAN Wiring.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjpqBUNg_YbkbnnWTQpDwQdoPFO5JO8NyU3FkplRfreWczRuqZEt8CndUaofqNSxFtXlQJVczWUzJrMhmqOqJIveLW_5UxtQR2gOhRv3GovWWQwdSrEKlOA9gvlRmNIdTAjD8OQ0U7FNW0v/s1600/WAN.Wiring.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="246" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjpqBUNg_YbkbnnWTQpDwQdoPFO5JO8NyU3FkplRfreWczRuqZEt8CndUaofqNSxFtXlQJVczWUzJrMhmqOqJIveLW_5UxtQR2gOhRv3GovWWQwdSrEKlOA9gvlRmNIdTAjD8OQ0U7FNW0v/s400/WAN.Wiring.png" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - The Layer 2 Topology Used for All Labs</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">(based on pic. 1 and pic. 2).</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgg8UmPUXyLkH_LmAPG3k2SBb2gGpKhBxwBRrezDYMv9kJ8xZBhLOQA2f0wn9FXeHoNzjeF3BVsJ8ukLie367fkDSxDjhZcNrsjFttOPG-K5jbmOAh8YX7xSJ4JvSAQQLtw2imyuisFFEL/s1600/HC.Topology1.v1.0-Layer2.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="278" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgg8UmPUXyLkH_LmAPG3k2SBb2gGpKhBxwBRrezDYMv9kJ8xZBhLOQA2f0wn9FXeHoNzjeF3BVsJ8ukLie367fkDSxDjhZcNrsjFttOPG-K5jbmOAh8YX7xSJ4JvSAQQLtw2imyuisFFEL/s400/HC.Topology1.v1.0-Layer2.png" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 4 - The Layer 3 Topology Used for All Labs</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">(based on pic. 1 and pic. 2).</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjY72IRY67cfr3irDdyRUPr8faGGZleQqad4-7v55AjiJ3NOMdpi_NkX25A8Y0xszm07aAsJB__Emil57NgW_A0AoJkYFYd5ANWvR7CqXF-zeuHCDzaci41RIhsa7D9NnMwOXiRAg_TZaZK/s1600/HC.Topology1.v1.0-Layer3.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="282" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjY72IRY67cfr3irDdyRUPr8faGGZleQqad4-7v55AjiJ3NOMdpi_NkX25A8Y0xszm07aAsJB__Emil57NgW_A0AoJkYFYd5ANWvR7CqXF-zeuHCDzaci41RIhsa7D9NnMwOXiRAg_TZaZK/s400/HC.Topology1.v1.0-Layer3.png" width="400" /></a></div>
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Pic. 3 and Pic. 4 topology is the result of applying the following configuration in the topology presented in Pic.1 and Pic. 2</div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic.1/2 Configuration (link below)</span></div>
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<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif; font-size: x-small;">© <a href="mailto:linuxed.jr@gmail.com">Jaro</a> 2013
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Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-85679723503239043752014-02-26T19:00:00.000+00:002014-02-26T19:04:26.760+00:00OSPF NSSA Area LSA7-to-5 Translator Election<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-stub-network-traffic-engineering.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | Next</span></span></span></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">In the task 3 of the previous lab you configured R3 as the gateway for all inter-area prefixes. Remove this configuration making area 34 NSSA with both R3 and R4 injecting N2 default route.</span><br />
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task 2</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">Ensure that R3 is the LSA7-to-5 Translator.</span></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
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<li><span style="font-family: 'Trebuchet MS', sans-serif;">In case there are two or more ABRs connected to the NSSA area, which device translates LSA7 to LSA5 while injecting NSSA external routes into OSPF area 0?</span></li>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOSDZzZGV0czdmak0/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOSDZzZGV0czdmak0/edit?usp=sharing</a></span><br />
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif;"><i>In the task 3 of the previous you configured R3 as the gateway for all inter-area prefixes. Remove this configuration making area 34 NSSA with both R3 and R4 injecting N2 default route.</i></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">R4 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> area 34 no-summary</span><br />
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">area 34 nssa default-information-originate</span></span><br />
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Note!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Both R3 and R4 have the same 'area 34 nssa default-information-originate' configured in the OSPF router.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - R3 and R4 Inject N2 Default Route.</span></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 2</b></div>
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<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Ensure that R3 is the LSA7-to-5 Translator.</i></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Note!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">In order to see which device is advertising 10.0.7.7/32 prefix, check 'show ip ospf database' on R1. Look at the output below:</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - LSA7-to-LSA5 Current Translator (now change in the config).</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R3 Config:</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 4 - R3 Configuration.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjahLOsSo-YZ1RCtRNB3E5kzvwWe4-y3I-N-Rr7YN5HS0790O0E6nD5d-lyuW_Wc8sQecc39uJtas6rNRQBCAJDbfKOHzxgkANHytwqT0Eo1KPE9034_hYUnDVR3gtTDDVqEcQFXtvJTSCc/s1600/ospf.39.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjahLOsSo-YZ1RCtRNB3E5kzvwWe4-y3I-N-Rr7YN5HS0790O0E6nD5d-lyuW_Wc8sQecc39uJtas6rNRQBCAJDbfKOHzxgkANHytwqT0Eo1KPE9034_hYUnDVR3gtTDDVqEcQFXtvJTSCc/s1600/ospf.39.03.png" height="50" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Note!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">For this change to take effect, clear ip ospf process on R3 as per Pic. 3, but also clear ospf process on R1 before you check the below:</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 5 - </span><span style="font-family: 'Trebuchet MS', sans-serif; text-align: center;">LSA7-to-LSA5 Current Translator.</span></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">The router with the highest router-id becomes LSA7-to-LSA5 translator. </span></div>
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<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-stub-network-traffic-engineering.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | Next</span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-21121518026436388162014-02-25T19:36:00.000+00:002014-02-26T19:01:31.943+00:00OSPF Stub Network Traffic Engineering<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-gre-tunnel-over-nssastub-area.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-nssa-area-lsa7-to-5-translator.html">Next</a></span></span></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPT38CkaU5WP-St_D1fy6LTptL6CpjzwJZgvoqEDb4BlKKoX2sdLMjHcn352AInwiIyfBHYo8MUvCrhKRmhJlJNKkmdYeG5pmhavt2KR5bZ9DGcWFTJWztFhILkxBE0nsutbnDEETfO8Hg/s1600/ospf.38.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPT38CkaU5WP-St_D1fy6LTptL6CpjzwJZgvoqEDb4BlKKoX2sdLMjHcn352AInwiIyfBHYo8MUvCrhKRmhJlJNKkmdYeG5pmhavt2KR5bZ9DGcWFTJWztFhILkxBE0nsutbnDEETfO8Hg/s1600/ospf.38.01.png" height="281" width="400" /></a></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Remove the OSPF configuration done in the previous labs and configure network as per topology diagram (top).</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task 2</b></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Configure mutual redistribution between OSPF and EIGRP domain. Check OSPF routing table on SW1.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 3</b></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Configure OSPF area 34 such that R3 becomes the gateway for all Inter-Area prefixes and R4 for all External prefixes. Should R3 go down, R4 should become the gateway of last resort for all prefixes. Do not modify the cost of any links to accomplish the task.</span></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">When OSPF is presented with intra-area, external, nssa, inter-area prefixes, what is the order of choosing the best path?</span></li>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOdFNVUFdGbTlHaHM/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOdFNVUFdGbTlHaHM/edit?usp=sharing</a></span><br />
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><i><span style="color: #0b5394;">Remove the OSPF configuration done in the previous labs and configure network as per topology diagram (top).</span></i></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Note!</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">I do not show how to remove all previous OSPF configuration to reduce the length of the post.</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">R1 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface Serial0/0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 172.16.0.1 255.255.255.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> encapsulation frame-relay</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">ip ospf network point-to-multipoint</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> clock rate 2000000</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.4 104 broadcast</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.3 103 broadcast</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.2 102 broadcast</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.1 102</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> no frame-relay inverse-arp</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> log-adjacency-changes</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 10.0.1.1 0.0.0.0 area 12</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.0.1 0.0.0.0 area 0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.12.1 0.0.0.0 area 12</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;"></span><br />
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> log-adjacency-changes</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 10.0.2.2 0.0.0.0 area 12</span></div>
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network 172.16.12.2 0.0.0.0 area 12</div>
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!</div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">R3 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface Serial0/0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 172.16.0.3 255.255.255.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> encapsulation frame-relay</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">ip ospf network point-to-multipoint</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> clock rate 2000000</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.4 301</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.3 301</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.2 301</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.1 301 broadcast</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> no frame-relay inverse-arp</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> log-adjacency-changes</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">area 34 nssa</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.0.3 0.0.0.0 area 0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.100.3 0.0.0.0 area 34</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface Serial0/0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 172.16.0.4 255.255.255.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> encapsulation frame-relay</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">ip ospf network point-to-multipoint</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> clock rate 2000000</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.4 401</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.3 401</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.2 401</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.1 401 broadcast</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> no frame-relay inverse-arp</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> log-adjacency-changes</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">area 34 nssa</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.0.4 0.0.0.0 area 0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.100.4 0.0.0.0 area 34</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router eigrp 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.45.4 0.0.0.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> no auto-summary</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">R5 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router eigrp 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 10.0.5.5 0.0.0.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.45.5 0.0.0.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> no auto-summary</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span><br />
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<span style="font-family: 'Trebuchet MS', sans-serif;">SW1 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">route-map CONNECTED permit 10</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> match interface Loopback0</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> log-adjacency-changes</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">area 34 nssa</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> redistribute connected subnets route-map CONNECTED</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.100.7 0.0.0.0 area 34</span></div>
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</div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;"><br /></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task 2</b></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><i><span style="color: #0b5394;">Configure mutual redistribution between OSPF and EIGRP domain. Check OSPF routing table on SW1.</span></i></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div class="" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> redistribute eigrp 1 subnets</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div class="" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;">router eigrp 1</span></div>
<div class="" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;"> redistribute ospf 1 metric 1 1 1 1 1</span></div>
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</div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - OSPF Routing Table on SW1. </span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRPN1sPlLx2yIX-5Nx6UuVsnKjQ2_YE0eEyO0lwPVSoydY5dk0hLfju3BF1HXGot8o4jzdmoRDZrZ3AW7n-fMmUShZia99u-CvDQXhuK1RDzdQJbkpIA-I1uxYFQZSqAQusUWtI9vUW9_d/s1600/ospf.38.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRPN1sPlLx2yIX-5Nx6UuVsnKjQ2_YE0eEyO0lwPVSoydY5dk0hLfju3BF1HXGot8o4jzdmoRDZrZ3AW7n-fMmUShZia99u-CvDQXhuK1RDzdQJbkpIA-I1uxYFQZSqAQusUWtI9vUW9_d/s1600/ospf.38.02.png" height="171" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 3</b></span></div>
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<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Configure OSPF area 34 such that R3 becomes the gateway for all Inter-Area prefixes and R4 for all External prefixes. Should R3 go down, R4 should become the gateway of last resort for all prefixes. Do not modify the cost of any links to accomplish the task.</i></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R3 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">area 34 nssa default-information-originate</span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">area 34 nssa no-summary</span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - OSPF Routing Table on SW1 After the Reconfiguration.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFJScIMI7gF3WY7ykpKBKZ5OKHK5jeUk4ohZ9IC08v0NcwObPK9oyAOJC9LPYbvoHe4enX2JOL4U5mdKqC-r7qVaW4aSYiawFCSOOFCuXh8H8v7s7qhouc6kmGSiCyPR_cpfY9hzyVRJU7/s1600/ospf.38.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFJScIMI7gF3WY7ykpKBKZ5OKHK5jeUk4ohZ9IC08v0NcwObPK9oyAOJC9LPYbvoHe4enX2JOL4U5mdKqC-r7qVaW4aSYiawFCSOOFCuXh8H8v7s7qhouc6kmGSiCyPR_cpfY9hzyVRJU7/s1600/ospf.38.03.png" height="141" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Note!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R3 still allows Inter-Area prefixes and for all unknown destination injects default route. R4 Defines the area as Not-So-Totally-Stubby Area which effectively blocks Inter-Area prefixes. For all unknown destination it inject default route. Since R3 provides the longest match for Inter-Area prefixes it becomes the gateway of last resort as long as it is available. </span><span style="font-family: 'Trebuchet MS', sans-serif;">R4 injects default route as Inter-Area prefix, whereas R3 as N2 prefix. The reason R4 is selected as preferred default gateway is due to the path selection process in OSPF which follows this sequence:</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b>intra-area > inter-area > external > nssa-external. </b></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br />OSPF uses the following sequence to select the best path: intra-area > inter-area > external > nssa-external. Try to shutdown sub-interface f0/1.100. As soon as SW1 realizes that R3 injects N2 default routefor all unknown destinations.</span><br />
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 4 - R4 F0/1.100 Shutdown.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiS6DnHK8qDAz0Ad-gZiesGB_lpkUY1KUgkBeyCzTjswZXhPLrwsD7aRl-Noi0nEGHwJqbcO417eM45mSCyDgMhb-P-ur9LFUqcO2DqOsU_ZpmLdwpK9Cvm0awmka06fI4qbx8hzhAgY39q/s1600/ospf.38.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiS6DnHK8qDAz0Ad-gZiesGB_lpkUY1KUgkBeyCzTjswZXhPLrwsD7aRl-Noi0nEGHwJqbcO417eM45mSCyDgMhb-P-ur9LFUqcO2DqOsU_ZpmLdwpK9Cvm0awmka06fI4qbx8hzhAgY39q/s1600/ospf.38.04.png" height="116" width="400" /></a></div>
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<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-gre-tunnel-over-nssastub-area.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-nssa-area-lsa7-to-5-translator.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-69334603062916152302014-02-19T22:02:00.001+00:002014-02-25T19:38:26.308+00:00OSPF GRE Tunnel over NSSA/Stub Area<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-not-so-totally-stubby-area.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-stub-network-traffic-engineering.html">Next</a></span></span></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhTF-Hxkw6wd7i72G9NmwvqniEeCqPNzcy55ZKxwIuhmm1qdc_WCIBY9L70zgYGA9_itMRfqCBKQ3xGz1P0DBf6gOh2VVC1XffSLsS9c-Ytu6tgfj4lQYU6_pJz-KU-b4sE3UgScUoBrZZM/s1600/ospf.36.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhTF-Hxkw6wd7i72G9NmwvqniEeCqPNzcy55ZKxwIuhmm1qdc_WCIBY9L70zgYGA9_itMRfqCBKQ3xGz1P0DBf6gOh2VVC1XffSLsS9c-Ytu6tgfj4lQYU6_pJz-KU-b4sE3UgScUoBrZZM/s1600/ospf.36.01.png" height="281" width="400" /></a></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Configure OSPF area 58 between R5 and SW2 (Vlan 58). Ensure that Vlan 58 does have connectivity to all prefixes in OSPF domain even if connection between R5 and SW2 failed. You can create two new IP addresses to accomplish the goal.</span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
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<li><span style="font-family: 'Trebuchet MS', sans-serif;">Can OSPF virtual-link be configured over a transit area that is stub or nssa?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">What is another method of extending area 0 if another area is not physically connected to the backbone area?</span></li>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOaGg4WE8yR3RNcWs/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOaGg4WE8yR3RNcWs/edit?usp=sharing</a></span><br />
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<i><span style="color: #0b5394;"><span style="font-family: 'Trebuchet MS', sans-serif;">Configure OSPF area 58 between R5 and SW2 (Vlan 58). Ensure that Vlan 58 does have connectivity to all prefixes in OSPF domain even if connection between R5 and SW2 failed. </span><span style="font-family: 'Trebuchet MS', sans-serif;">You can create two new IP addresses to accomplish the goal.</span></span></i></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Note!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">As per lab stipulation, area 58 must be also linked through area 28 to the backbone area to provide connectivity in case of R5 to SW2 link failure. However, area 28 is nssa and virtual-link cannot be used to make SW2 an ABR, GRE tunnel must be used instead.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface tunnel0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 192.168.28.2 255.255.255.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> tunnel source f0/1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> tunnel destination 172.16.28.8</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">network 192.168.28.2 0.0.0.0 area 0</span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">SW2 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface tunnel0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 192.168.28.8 255.255.255.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> tunnel source vlan 28</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> tunnel destination 172.16.28.2</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">network 192.168.28.8 0.0.0.0 area 0</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">network 172.16.58.8 0.0.0.0 area 58</span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R5 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> log-adjacency-changes</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> area 45 virtual-link 10.0.4.4</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> area 59 virtual-link 10.0.9.9</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.45.5 0.0.0.0 area 45</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">network 172.16.58.5 0.0.0.0 area 58</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.59.5 0.0.0.0 area 59</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - Status of GRE Tunnel.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjoyR-Sx8RMIwKj12Qaz0SL-CXtUogGqAkzq2CsaxFtfogH4yHrtJ3c5aOkcdDwte4_K8kMjhbSWelza51wIpqRqihvzw0EDlqxw6T_GI5Ff26Ir-CFZhWqGvJ0tumJHKD6rSVlZEeh4wWt/s1600/ospf.37.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjoyR-Sx8RMIwKj12Qaz0SL-CXtUogGqAkzq2CsaxFtfogH4yHrtJ3c5aOkcdDwte4_K8kMjhbSWelza51wIpqRqihvzw0EDlqxw6T_GI5Ff26Ir-CFZhWqGvJ0tumJHKD6rSVlZEeh4wWt/s1600/ospf.37.02.png" height="375" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - Vlan 58 Availability.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihV4IGri_kNCG-GXxR8DItnB8ZfT3IKpvQXNTsSNgP7qlKlBTsv1wcTB7YCbKcdXwXTtosVuK9A600y17rJ5B4OyocSj5EQDKZDYVhbvwq40DGkwosl2jCWHeglDHKWU4psRqOtYlFPCMV/s1600/ospf.37.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihV4IGri_kNCG-GXxR8DItnB8ZfT3IKpvQXNTsSNgP7qlKlBTsv1wcTB7YCbKcdXwXTtosVuK9A600y17rJ5B4OyocSj5EQDKZDYVhbvwq40DGkwosl2jCWHeglDHKWU4psRqOtYlFPCMV/s1600/ospf.37.03.png" height="72" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Shut down interface Fas0/0 on R5. The ping test from R6 is still successful!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br />OSPF virtual-link cannot cross any transit area that is stub or nssa. An alternative solution is to use GRE tunnel.</span><br />
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<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-not-so-totally-stubby-area.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-stub-network-traffic-engineering.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-42686223461199913402014-02-18T19:48:00.000+00:002014-02-19T22:03:54.674+00:00OSPF Not-So-Totally-Stubby Area<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-nssa-filtering.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-gre-tunnel-over-nssastub-area.html">Next</a></span></span></span></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Change OSPF area 28 in such a way, that it does not allow external (E2) and inter-area (IA) prefixes. It must still allow redistributed prefixes on SW2 configured in previous lab. Routers in area 28 (SW2) should have connectivity to all advertised subnets.</span></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">In No-So-Totally-Stubby Area, what does ABR do by default which ABR in NSSA does not</span><span style="font-family: 'Trebuchet MS', sans-serif;">?</span></li>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOM0stVzEwcjdHNlU/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOM0stVzEwcjdHNlU/edit?usp=sharing</a></span><br />
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<b style="font-family: 'Trebuchet MS', sans-serif;"><i><span style="color: #0b5394;">Task 1</span></i></b></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif;"><i>Change OSPF area 28 in such a way, that it does not allow external(E2) and inter-area (IA) prefixes. It must still allow redistributed prefixes on SW2 configured in previous lab. Routers in area 28 (SW2) should have connectivity to all advertised subnets.</i></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 2 - SW2 Routing Table with NSSA Configuration (previous lab).</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJrainh4FpJWyRAdhfrytEoz24vhEftblKl5I2tfjF8pbL9ZviSqhUi64yMafd5CnvEvTPBDP6EaR0dp1w6F3sp3nqgHBssrJJKsXkyi74fq7WmGOV324PJAeGBy_e4OlS5O0FIVHFujvu/s1600/ospf.35.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJrainh4FpJWyRAdhfrytEoz24vhEftblKl5I2tfjF8pbL9ZviSqhUi64yMafd5CnvEvTPBDP6EaR0dp1w6F3sp3nqgHBssrJJKsXkyi74fq7WmGOV324PJAeGBy_e4OlS5O0FIVHFujvu/s1600/ospf.35.02.png" height="235" width="400" /></a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">R2 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> area 28 nssa</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> area 28 nssa no-summary</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - </span><span style="font-family: 'Trebuchet MS', sans-serif; text-align: center;">SW2 Routing Table with Not-So-Totally-Stubby Area.</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif; text-align: center;">Default route automatically advertised by ABR (R2) allows connectivity to all other ospf prefixes.</span><span style="font-family: 'Trebuchet MS', sans-serif;"> </span></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br />By default ABR router in Not-So-Totally-Stubby Area will inject the default route as the substitute for prefixes filtered out. This is not going to happen if ABR is connected to NSSA area. In such case, ABR must have explicit injection of the default route like shown in the previous lab.</span><br />
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<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-nssa-filtering.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-gre-tunnel-over-nssastub-area.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-23825777097605915752014-02-17T20:13:00.000+00:002014-02-19T18:09:54.371+00:00OSPF NSSA Filtering<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-totally-stubby-area-filtering.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-not-so-totally-stubby-area.html">Next</a></span></span></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqdwn1Ox4ikjD9igWCEdQEuhAdQoukAx2FYl_5lDukn5FF-bT7ANYQ_lAIY1pGGyoDngUQvTRvFVVAk8TZb3zo_1NEHgZJ3vqDCfHIDmzTGvEe-O2JFGkLnYfLCSbDANRPzCXqCiZSgImS/s1600/ospf.34.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqdwn1Ox4ikjD9igWCEdQEuhAdQoukAx2FYl_5lDukn5FF-bT7ANYQ_lAIY1pGGyoDngUQvTRvFVVAk8TZb3zo_1NEHgZJ3vqDCfHIDmzTGvEe-O2JFGkLnYfLCSbDANRPzCXqCiZSgImS/s1600/ospf.34.01.png" height="281" width="400" /></a></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">On SW2 create two loopbacks and configure IP addresses as shown below.</span></div>
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<ul>
<li><span style="font-family: Trebuchet MS, sans-serif;">Loopback1: 192.168.8.8/24</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Loopback2: 192.168.88.8/24</span></li>
</ul>
<span style="font-family: 'Trebuchet MS', sans-serif;">Configure OSPF area 28 in such a way, that R2 does not allow external prefixes but allows SW2 redistribute two new loopbacks into OSPF as external LSAs (SW2 is becoming ASBR). Ensure that routers in area 28 do have connectivity to all external prefixes already advertised.</span><br />
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">What kind of solution can solve the problem</span><span style="font-family: 'Trebuchet MS', sans-serif;">?</span></li>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">What is a potential pitfall using this solution?</span></li>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOd29BZ3hqZVVSM28/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOd29BZ3hqZVVSM28/edit?usp=sharing</a></span><br />
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif;"><i>On SW2 create two loopbacks and configure IP addresses as shown below.</i></span></div>
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<ul>
<li><span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Loopback1: 192.168.8.8/24</i></span></li>
<li><span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Loopback2: 192.168.88.8/24</i></span></li>
</ul>
<i style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif;">Configure OSPF area 28 in such a way, that R2 does not allow external prefixes but allows SW2 redistribute two new loopbacks into OSPF as external LSAs (SW2 is becoming ASBR). Ensure that routers in area 28 do have connectivity to all external prefixes already advertised.</i><br />
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<span style="font-family: Trebuchet MS, sans-serif;">SW2 Configuration:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface Loopback1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 192.168.8.8 255.255.255.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface Loopback2</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 192.168.88.8 255.255.255.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">route-map CONN_TO_OSPF permit 10</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> match interface loopback1 loopback2</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> area 28 stub</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">area 28 nssa</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> redistribute connected subnets route-map CONN_TO_OSPF</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">In order to match the area a quick jump to R2.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> area 28 stub</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">area 28 nssa default-information-originate</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Note!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R2 is ABR in area 28. While configuring NSSA area, ABR does NOT inject the default route by default. This way, all routers in area 28 (SW2) would not be able to reach other prefixes that area external ones redistributed in OSPF domain outside area 28. Thus, the </span><span style="font-family: Courier New, Courier, monospace;">area 28 nssa default-information-originate</span><span style="font-family: Trebuchet MS, sans-serif;"> command on R2.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - LSA Type 7 on SW2 (NSSA).</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgLNib5UkrOrLLrItzGITUv1sqT2zIE1D1i8GtBzF-Av2ZnMH7jihA_JVJn1207hfHMDwwXhYmwdBo63aUzSNCwXUHjbJJrsbS-xRpKBu3MUKD1vUztvJxi6fW3uRw7qtByvGtQAAUxb1Qf/s1600/ospf.34.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgLNib5UkrOrLLrItzGITUv1sqT2zIE1D1i8GtBzF-Av2ZnMH7jihA_JVJn1207hfHMDwwXhYmwdBo63aUzSNCwXUHjbJJrsbS-xRpKBu3MUKD1vUztvJxi6fW3uRw7qtByvGtQAAUxb1Qf/s1600/ospf.34.02.png" height="88" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - SW2 NSSA 7 Converted to LSA5 in Area 0.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn4qgcH4jE_z6qcAojRpIpGtfYMYG4jooAsRJKQ7jDByq8cYdjrXyO65NbC934aa2Ow5Yc5Vxoqwm-5sY7eLTpe9nboYTX3IZ5cK2c8f5xK9Vws0pgkZAas-nhJ8jRjdgPtIN8C0z30jxb/s1600/ospf.34.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn4qgcH4jE_z6qcAojRpIpGtfYMYG4jooAsRJKQ7jDByq8cYdjrXyO65NbC934aa2Ow5Yc5Vxoqwm-5sY7eLTpe9nboYTX3IZ5cK2c8f5xK9Vws0pgkZAas-nhJ8jRjdgPtIN8C0z30jxb/s1600/ospf.34.03.png" height="120" width="400" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br />OSPF Not-So-Stubby Area allows filtering LSA 5 but allows a presence of ASBR. The difference is that ASBR introduces external prefixes as LSA 7 (NSSA). ABR converts them into LSA 5 while introducing them into area 0.</span><br />
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<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-totally-stubby-area-filtering.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-not-so-totally-stubby-area.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-9343471532587972082014-02-14T10:55:00.000+00:002014-02-19T18:07:25.441+00:00OSPF Totally Stubby Area Filtering<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-stub-area-filtering.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-nssa-filtering.html">Next</a></span></span></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><span style="color: red;">Note!</span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Since in our previous lab we have configured new loopbacks, R1 changes its ospf router id to the highest IP address of the loopback interface (192.168.1.49) after reload. This will affect the virtual-link created between R1 and R3. In order to correct that, we must change ospf router id on R1 manually so that it matches the VL configuration on R3. Here's quick config you should apply:</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R1 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">router-id 10.0.1.1</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">And then, the 'clear ip ospf process' for this change to take effect. Do clear the ospf on both R1 and R3.</span></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Extend OSPF area 0 to include R6 to SW4 connection. Advertise loopback0 of SW4 into area 100 (as per pic.1 above).</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task 2</b></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Reduce the size of the routing table in OSPF area 100 so that external and inter-area prefixes are represented by default route. Do not use any filtering tool such as ACL, prefix-list, etc. Use Cisco proprietary feature to accomplish the task.</span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
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<li><span style="font-family: 'Trebuchet MS', sans-serif;">What is the difference between this solution and the one used in the previous lab</span><span style="font-family: 'Trebuchet MS', sans-serif;">?</span></li>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">Do all routers have to be Cisco devices to solve the problem presented in this lab?</span></li>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOdHBmTHRkc01lZG8/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOdHBmTHRkc01lZG8/edit?usp=sharing</a></span><br />
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif;"><i>Extend OSPF area 0 to include R6 to SW4 connection. Advertise loopback0 of SW4 into area 100 (as per pic.1 above).</i></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">R6 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.106.6 0.0.0.0 area 100</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">NOTE!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">This lab runs on GNS3 emulator. In case you use real layer3 switch, you should start with enabling routing for IPv4 first ('ip routing' command in the global config mode).</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">SW4 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 10.0.10.10 0.0.0.0 area 100</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> network 172.16.106.10 0.0.0.0 area 100</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - R6 Current OSPF Neighbors.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOf8l699KwAqq70jPezc480Ox5WG6x8HeNf96LjKzPIjOES2lt7nkQw5Cm39Zj7ZxfCVO8MTIQiIh6_azaMdukDuJ3nYoEPVjCD-jr7Es-BaQAhu6SwduNIalYhTxQh-Ar10jrNoloeeeG/s1600/ospf.33.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOf8l699KwAqq70jPezc480Ox5WG6x8HeNf96LjKzPIjOES2lt7nkQw5Cm39Zj7ZxfCVO8MTIQiIh6_azaMdukDuJ3nYoEPVjCD-jr7Es-BaQAhu6SwduNIalYhTxQh-Ar10jrNoloeeeG/s1600/ospf.33.02.png" height="75" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - SW4 OSPF Routing Table.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmChbjE97gHliAzD9Ly_ZrtSyIGtqNfbDJpv22L8PTk12TzNUjbTFIXsHU0cmM7cPkfnVBGGzUibczDoN_uQm7qxSf_XJJkNv1bIuFzkAyXzDexXBC8n0NIeDFgq29QT56fGvUBt-uiz_B/s1600/ospf.33.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmChbjE97gHliAzD9Ly_ZrtSyIGtqNfbDJpv22L8PTk12TzNUjbTFIXsHU0cmM7cPkfnVBGGzUibczDoN_uQm7qxSf_XJJkNv1bIuFzkAyXzDexXBC8n0NIeDFgq29QT56fGvUBt-uiz_B/s1600/ospf.33.03.png" height="280" width="400" /></a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Note!</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">All routers in OSPF area 100 accept all types of LSA right now.</span></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 2</b></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif;"><i>Reduce the size of the routing table in OSPF area 100 so that external and inter-area prefixes are represented by default route. Do not use any filtering tool such as ACL, prefix-list, etc. Use Cisco proprietary feature to accomplish the task.</i></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">R3 and R4 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> area 100 stub <span style="color: red;">no-summary</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">R6, SW1, and SW4 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> area 100 <span style="color: red;">stub</span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 4 - SW4 Routing Table and Connectivity.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2A8mxtbKYh2NjlUE0DzOTRRsCV50b4CaMHEAi56OFYPHaTl8GppMghrmcXFfOJ0KnZ8n3r2enV_vkyR1lLL3LzcsnEN8Ili0soc9f9Kof43iH3rSZlUBif5RzrvekmDUc4eMIsuEx0T8g/s1600/ospf.33.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2A8mxtbKYh2NjlUE0DzOTRRsCV50b4CaMHEAi56OFYPHaTl8GppMghrmcXFfOJ0KnZ8n3r2enV_vkyR1lLL3LzcsnEN8Ili0soc9f9Kof43iH3rSZlUBif5RzrvekmDUc4eMIsuEx0T8g/s1600/ospf.33.04.png" height="265" width="400" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br />Cisco implemented additional ABR filtering in IOS called totally stubby area. This feature allows to reduce the size of the routing table by filtering external (just like in stub area) as well as inter-area prefixes. An ABR is injecting the default route instead to allow connectivity to filtered prefixes. Totally stubby area is a Cisco feature, so ABR routers must be Cisco devices to use it. The routers within the totally stubby area do not have to be Cisco devices.</span><br />
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<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-stub-area-filtering.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-nssa-filtering.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-34093089126588415952014-02-13T20:07:00.000+00:002014-02-19T18:04:58.633+00:00OSPF Stub Area Filtering<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link-complex-scenario.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-totally-stubby-area-filtering.html">Next</a></span></span></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjllCY0dlALRTsSWAp8A3iV9-uvdHzuZjbY65yjvoS_Bg83t_Ghs-CGOkQ_X4cndxQJWBfDGipCFywktAZW2l4_FZlcBD9MYeMD92MdpHBwngilKcxrf0o4YNDEacmxsl__pauWhYMBWXJM/s1600/ospf.32.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjllCY0dlALRTsSWAp8A3iV9-uvdHzuZjbY65yjvoS_Bg83t_Ghs-CGOkQ_X4cndxQJWBfDGipCFywktAZW2l4_FZlcBD9MYeMD92MdpHBwngilKcxrf0o4YNDEacmxsl__pauWhYMBWXJM/s1600/ospf.32.01.png" height="281" width="400" /></a></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">On R2 Remove the configuration from previous labs as follows:</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip route 1.1.1.1 255.255.255.255 Null0 track 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;">no ip route 10.0.8.8 255.255.255.255 172.16.28.8</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip prefix-list FAKE_NETWORK seq 5 permit 1.1.1.1/32</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip route 1.1.1.1 255.255.255.255 Null0 track 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip route 10.0.8.8 255.255.255.255 172.16.28.8</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> track 1 rtr 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> default-information originate always route-map TRACK_FAKE_NETWORK</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">On SW2:</span></div>
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<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip route 10.0.0.0 255.255.0.0 172.16.28.2</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip route 172.16.0.0 255.255.0.0 172.16.28.2</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
</div>
<div class="separator" style="clear: both;">
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
<div class="separator" style="clear: both;">
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 2</b></div>
<div class="separator" style="clear: both;">
<span style="font-family: Trebuchet MS, sans-serif;">Configure the following loopbacks on R1 and advertise them into OSPF area 0 as E2 types (external type-2).</span></div>
<div class="separator" style="clear: both;">
</div>
<ul>
<li><span style="font-family: Trebuchet MS, sans-serif;">Loopback1: 192.168.1.1/28</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Loopback1: 192.168.1.17/28</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Loopback1: 192.168.1.33/28</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Loopback1: 192.168.1.49/28</span></li>
</ul>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 3</b></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">Configure OSPF area 28 between R2 and SW2 (as per topology shown above). Advertise SW2 Loopback0 into OSPF area 28. Ensure that routers in area 28 do not learn any external prefixes (LSA5) but have connectivity to those. Do not use any filtering mechanism such as ACL, prefix-list, etc. to accomplish the task.</span></div>
<br />
<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">What are OSPF area types?</span></li>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">What does OSPF stub area do?</span></li>
</ol>
<div>
<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZORlREb0E0MnVaVlk/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZORlREb0E0MnVaVlk/edit?usp=sharing</a></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 1</b></span><br />
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Completed above.</i></span><br />
<br />
<div class="separator" style="clear: both;">
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 2</b></div>
<div class="separator" style="clear: both;">
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Configure the following loopbacks on R1 and advertise them into OSPF area 0 as E2 types (external type-2).</i></span></div>
<div class="separator" style="clear: both;">
</div>
<ul>
<li><span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Loopback1: 192.168.1.1/28</i></span></li>
<li><span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Loopback1: 192.168.1.17/28</i></span></li>
<li><span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Loopback1: 192.168.1.33/28</i></span></li>
<li><span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Loopback1: 192.168.1.49/28</i></span></li>
</ul>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">R1 Config:</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<div>
<span style="font-family: Courier New, Courier, monospace;">interface Loopback0</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> ip address 10.0.1.1 255.255.255.255</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">interface Loopback1</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> ip address 192.168.1.1 255.255.255.240</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">interface Loopback2</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> ip address 192.168.1.17 255.255.255.240</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">interface Loopback3</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> ip address 192.168.1.33 255.255.255.240</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">interface Loopback4</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> ip address 192.168.1.49 255.255.255.240</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">ip prefix-list LOOPBACKS permit 192.168.1.0/16 ge 28</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">route-map CONN_TO_OSPF permit 10</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> match ip address prefix-list LOOPBACKS</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> redistribute connected subnets route-map CONN_TO_OSPF</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div style="font-family: 'Trebuchet MS', sans-serif;">
<br /></div>
<div style="font-family: 'Trebuchet MS', sans-serif; text-align: center;">
Pic. 2 - LSA5 Advertised by R1.</div>
<div style="font-family: 'Trebuchet MS', sans-serif; text-align: center;">
<br /></div>
<div class="separator" style="clear: both; font-family: 'Trebuchet MS', sans-serif; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgiJMVvdF8ipR5dlcMnth84XFUhZisXFbgPy73aqoELKH4YqIujbqVaZPWyS1329uTX591D6oOxzcy0oCHE75DXlhFoCgZRqOtRqeyPNQPR35w2KLEb0j-R44UeuGFbOx8NMfNdvGfCNTLB/s1600/ospf.32.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgiJMVvdF8ipR5dlcMnth84XFUhZisXFbgPy73aqoELKH4YqIujbqVaZPWyS1329uTX591D6oOxzcy0oCHE75DXlhFoCgZRqOtRqeyPNQPR35w2KLEb0j-R44UeuGFbOx8NMfNdvGfCNTLB/s1600/ospf.32.02.png" height="121" width="400" /></a></div>
<div style="font-family: 'Trebuchet MS', sans-serif; text-align: center;">
<br /></div>
<div style="font-family: 'Trebuchet MS', sans-serif;">
<b>Task 3</b></div>
</div>
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;"><i><span style="color: #0b5394;">Configure OSPF area 28 between R2 and SW2 (as per topology shown above). Advertise SW2 Loopback0 into OSPF area 28. Ensure that routers in area 28 do not learn any external prefixes (LSA5) but have connectivity to those. Do not use any filtering mechanism such as ACL, prefix-list, etc. to accomplish the task.</span></i></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - SW2 Routing Table Before Stub Network Configuration.</span></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisZmVX5ddYUZwWgHQ3k2dqw0KpxDf_NN0ItYa92FFth8rgIFncP3glcErE-rtnYeOwiT6S20crVIc7N6ofOy-1AB4LJ0riSIiKeah6Cv3183LnGDGyilKAcVa20Aflc-fhb4R3meop9VkO/s1600/ospf.32.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisZmVX5ddYUZwWgHQ3k2dqw0KpxDf_NN0ItYa92FFth8rgIFncP3glcErE-rtnYeOwiT6S20crVIc7N6ofOy-1AB4LJ0riSIiKeah6Cv3183LnGDGyilKAcVa20Aflc-fhb4R3meop9VkO/s1600/ospf.32.03.png" height="273" width="400" /></a></div>
</div>
<div>
<br /></div>
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;">R2 Config:</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<div>
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> network 172.16.28.2 0.0.0.0 area 28</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div style="font-family: 'Trebuchet MS', sans-serif;">
<br /></div>
<div style="font-family: 'Trebuchet MS', sans-serif;">
SW2 Config:</div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<div>
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> log-adjacency-changes</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> network 10.0.8.8 0.0.0.0 area 28</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> network 172.16.28.8 0.0.0.0 area 28</span></div>
</div>
</div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"><br /></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">In order to filter out External prefixes the following must be added:</span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">area 28 stub</span></span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;">SW2</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<div>
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">area 28 stub</span></span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
</div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 4 - Area 28 Stub.</span></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8XSfwJqXzsveKH_xtFJp96D5F5a03CiWVU3a67iR8l3FuB9l4cpZLpBywXIkRHS7hz1DkYimQFbeHZnvJ2fub-rZM6NsEuejLNhR-qaD2KqSSRmnfdAb26LPBXsh2lSibc5OEnvA0HaZQ/s1600/ospf.32.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8XSfwJqXzsveKH_xtFJp96D5F5a03CiWVU3a67iR8l3FuB9l4cpZLpBywXIkRHS7hz1DkYimQFbeHZnvJ2fub-rZM6NsEuejLNhR-qaD2KqSSRmnfdAb26LPBXsh2lSibc5OEnvA0HaZQ/s1600/ospf.32.04.png" height="216" width="400" /></a></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">Notice!</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">External prefixes are no longer present in the routing table. ABR (R2) injects the default route automatically to ensure the connectivity to the external prefixes.</span></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
</div>
</div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br />There are three major types of OSPF areas:</span><br />
<br />
<ul>
<li><span style="font-family: Trebuchet MS, sans-serif;">Normal (default).</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Stub (filters LSA5; ABR injects default route to provide reachability to filtered networks).</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Not-So-Stubby (NSSA; filtering LSA5 but allowing redistribution into OSPF).</span></li>
</ul>
<br />
<br /></div>
</div>
</div>
</div>
<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link-complex-scenario.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-totally-stubby-area-filtering.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-49004531017336906462014-02-12T18:54:00.000+00:002014-02-19T17:48:14.342+00:00OSPF Virtual Link - Complex Scenario<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link-repairing-partitioned.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-stub-area-filtering.html">Next</a></span></span></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
</div>
<div class="separator" style="clear: both; text-align: center;">
</div>
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</div>
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</div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKH_cFvTAf-VksUddOjSLGZV1wHNUmLeZI7FqeLLIlch8i5aG9r3MJQc5-s-Q05fgv3QdBeDa0OakqLI_B1wTjLzNXtfZZvW9pJmNWom6w3X8wYeHy0YZu3_3cbwNLx5ircQG75mlGFTq8/s1600/ospf.31.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKH_cFvTAf-VksUddOjSLGZV1wHNUmLeZI7FqeLLIlch8i5aG9r3MJQc5-s-Q05fgv3QdBeDa0OakqLI_B1wTjLzNXtfZZvW9pJmNWom6w3X8wYeHy0YZu3_3cbwNLx5ircQG75mlGFTq8/s1600/ospf.31.01.png" height="281" width="400" /></a></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both;">
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: 'Trebuchet MS', sans-serif;">Replace OSPF area 0 configured between R5 and SW3 with OSPF area 59. Advertise SW3 loopback0 into OSPF area 300. Ensure full OSPF connectivity given new design.</span><br />
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">What does OSPF virtual Link do?</span></li>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">Are 'hellos' sent over virtual link?</span></li>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">What are limitations of using OSPF virtual link?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Does OSPF send 'hello' packets over virtual link?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">What is the alternative to virtual link to connect separated OSPF areas to area 0?</span></li>
</ol>
<div>
<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOdDU0OTktU1hIU3M/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOdDU0OTktU1hIU3M/edit?usp=sharing</a></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<br />
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b><br />
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><i><span style="color: #0b5394;">Replace OSPF area 0 configured between R5 and SW3 with OSPF area 59. Advertise SW3 loopback0 into OSPF area 300. Ensure full OSPF connectivity given new design</span>.</i></span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
</div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: 'Trebuchet MS', sans-serif;">R4 Current Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> area 45 virtual-link 10.0.5.5</span><br />
<span style="font-family: Courier New, Courier, monospace;"> network 172.16.0.0 0.0.0.255 area 0</span><br />
<span style="font-family: Courier New, Courier, monospace;"> network 172.16.45.0 0.0.0.255 area 45</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">R5 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">network 172.16.59.5 0.0.0.0 area 58</span></span><br />
<span style="font-family: Courier New, Courier, monospace;"> network 172.16.45.5 0.0.0.0 area 45</span><br />
<span style="font-family: Courier New, Courier, monospace;"> area 45 virtual-link 10.0.4.4</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">area 58 virtual-link 10.0.9.9</span></span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">SW3 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">network 172.16.59.9 0.0.0.0 area 58</span></span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">network 10.0.9.9 0.0.0.0 area 300</span></span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">area 58 virtual-link 10.0.5.5</span> </span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
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<span style="font-family: Trebuchet MS, sans-serif;">Note!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">In order to connect area 300 to the backbone area (area 0), two virtual links had to be configured: first, between R4 and R5 (making R5 new ABR), then between R5 and SW3, so that the loopback of SW3 (10.0.9.9/32) can be propagated to the rest of the OSPF domain.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - R5's Two Virtual Links.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - Ping Test from SW3 Loopback0.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGyBxh2KkHzMP3n-WR71jGyYu_MQ4VpdiZWCOzuFGGWPV0diKV1bwD1ZFVIIZjQ4xxR2QcUoRHCQUbCGpCpMyZMqVD57ZkmIRTb4v1efpfCZnLg88mZq-vvFI3gkYTZdd-9Pg8nO2M4RXR/s1600/ospf.31.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGyBxh2KkHzMP3n-WR71jGyYu_MQ4VpdiZWCOzuFGGWPV0diKV1bwD1ZFVIIZjQ4xxR2QcUoRHCQUbCGpCpMyZMqVD57ZkmIRTb4v1efpfCZnLg88mZq-vvFI3gkYTZdd-9Pg8nO2M4RXR/s1600/ospf.31.03.png" height="290" width="400" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: 'Trebuchet MS', sans-serif;">OSPF virtual link is extending the area 0 (backbone area) providing virtual point-to-point path between two ABRs. We must remember that we cannot create a virtual link over a transit area that is stub. Transit area is the one over which we create VL. Virtual link is not used to send hello packets. Also, LSAs learned via VL are not aging as learned in a traditional way (DNA='do not age' bit is set). LSA types 1,2,3,4 from area 0 are exchanged using VL, but LSA type 5 are not. LSA type 5 (external) have scope of domain (not an area), so this explains why a transit area cannot be stub.</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">If a transit area (the one we try to use to get to area 0) is a stub area, alternatively we can patch the network using GRE tunnels (we will use that method in some future lab).</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">As for the hello packets, after VL has been configured using router-id of connecting devices (not their real IP addresses), the intra-area shortest path is calculated and the 'hello' packets are exchanged (using 'unicast', not multicast). After discovering the new connection using VL, normal LSDB exchange is performed.</span><br />
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<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link-repairing-partitioned.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-stub-area-filtering.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-90967065829317467342014-02-11T17:59:00.000+00:002014-02-12T18:56:41.865+00:00OSPF Virtual Link - Repairing Partitioned Area 0<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link-complex-scenario.html">Next</a></span></span></span></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">You have been called as a network consultant to configure OSPF Area 0 between R5 and SW3 in XYZ Enterprises. </span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 2</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">After several months, your company acquires XYZ Enterprises. Without changing area 0 between R5 and SW3, enable OSPF connectivity with the rest of the OSPF domain. Use OSPF capability to connect partitioned backbone areas.</span><br />
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">Is there an alternative way of doing it without utilizing OSPF capability?</span></li>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOejU0VVVVRmlWYkU/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOejU0VVVVRmlWYkU/edit?usp=sharing</a></span><br />
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>You have been called as a network consultant to configure OSPF Area 0 between R5 and SW3 in XYZ Enterprises.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R5 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: 'Courier New', Courier, monospace;"> network 172.16.59.5 0.0.0.0 area 0</span><br />
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">SW3 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<div>
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> network 172.16.59.9 0.0.0.0 area 0</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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Pic. 2 - SW3 OSPF Neighbor and OSPF Routing Table.</div>
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Note!</div>
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Since Area 0 is now partitioned, SW3 is not learning all OSPF prefixes (only what R5 is advertising as local networks). Now, R5 complains about mismatched area ID and prompts for virtual-link creation.</div>
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<b>Task 2</b></div>
</div>
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>After several months, your company acquires XYZ Enterprises. Without changing area 0 between R5 and SW3, enable OSPF connectivity with the rest of the OSPF domain. Use OSPF capability to connect partitioned backbone areas.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> area 45 virtual-link 10.0.5.5</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R5 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> area 45 virtual-link 10.0.4.4</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - R4 to R5 Connection with OSPF Virtual-Link.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4X3gZxuNWPCW8Xz3DyZIQshvb62x5tqTN84oDDK4QRUxjzmGhUngDY_fuR1bIkgLjMyWqgIoDKkwL2QfA-t5ZX66RWCd5o8jZx3GFoBDb4V16K_qJcERNS5qfMlCXdWx1J1IrfDaSQPPk/s1600/ospf.lab30.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4X3gZxuNWPCW8Xz3DyZIQshvb62x5tqTN84oDDK4QRUxjzmGhUngDY_fuR1bIkgLjMyWqgIoDKkwL2QfA-t5ZX66RWCd5o8jZx3GFoBDb4V16K_qJcERNS5qfMlCXdWx1J1IrfDaSQPPk/s1600/ospf.lab30.03.png" height="95" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 4 - SW3 Current Routing Table.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3ca9fmHs9sV9EfDQJfn8abItkdIZ08-uROwEp5koyYciyDE_gmLePv_FB0JEpJxTB18GgD_UAQhR20y4kUQ4bwUZxn1s24U2S-Q_Zpz9j515ysUytutYBuMG6r7Uhyphenhyphenj_ojZOA4WBCZAka/s1600/ospf.lab30.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3ca9fmHs9sV9EfDQJfn8abItkdIZ08-uROwEp5koyYciyDE_gmLePv_FB0JEpJxTB18GgD_UAQhR20y4kUQ4bwUZxn1s24U2S-Q_Zpz9j515ysUytutYBuMG6r7Uhyphenhyphenj_ojZOA4WBCZAka/s1600/ospf.lab30.04.png" height="217" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Now, SW3 has full connectivity to OSPF domain.</span><br />
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: 'Trebuchet MS', sans-serif;">The lab stipulates that we should use OSPF capability to create connection between partitioned areas 0. If there was no stipulation like this, we could also use GRE tunnel can be used to accomplish the same goal. Try to do it on your own.</span><br />
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<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link-complex-scenario.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-64124774566174174882014-02-10T09:53:00.000+00:002014-02-11T18:00:46.014+00:00OSPF Virtual Link<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-auto-cost.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link-repairing-partitioned.html">Next</a></span></span></span></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">Ensure that R3 will have connectivity VLAN 12 subnet in case Frame-Relay connection is down.</span><br />
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">How does traffic flow between areas in multiarea OSPF design?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">What area two common methods available to patch a partitioned Area 0 or connect a disconnected area to Area 0?</span></li>
</ol>
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<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOeUhoX0ZNUTV5Ykk/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOeUhoX0ZNUTV5Ykk/edit?usp=sharing</a></span><br />
<br />
<div class="separator" style="clear: both;">
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Ensure that R3 will have connectivity VLAN 12 subnet in case Frame-Relay connection is down.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R1 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> area 13 virtual-link 10.0.3.3</span><br />
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
</div>
</div>
<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<div style="text-align: left;">
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<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">R3 Config:</span></div>
<div style="text-align: left;">
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div style="text-align: left;">
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
<div style="text-align: left;">
<span style="font-family: Courier New, Courier, monospace;"> area 13 virtual-link 10.0.1.1</span></div>
<div style="text-align: left;">
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div style="text-align: left;">
<br /></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - OSPF Virtual Link Between R1 and R3.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCG3UEdaSShL5wdr1lHUAvVc68MqE8oZ5M5OEEaYmyl7ySLFYGJvplNzM1zONtDxqTJm_i8abmUlx3FyM_NKmHyrk91v2PtvJn6GcTcrZ3kS1fnZvaZgWo-8eNxyBxA8DjFq0DWv_NG6lp/s1600/hc.ospf.lab28.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCG3UEdaSShL5wdr1lHUAvVc68MqE8oZ5M5OEEaYmyl7ySLFYGJvplNzM1zONtDxqTJm_i8abmUlx3FyM_NKmHyrk91v2PtvJn6GcTcrZ3kS1fnZvaZgWo-8eNxyBxA8DjFq0DWv_NG6lp/s1600/hc.ospf.lab28.02.png" height="105" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - Virtual Link.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhE-UddkEpEf2z2ZUx0nsrhRkAKRkBVVOLcpRXRi2t7_VyJ8aqfWvOgwPpLMHUnxDWqagzlv1UAprQ5vWTYEHg6oB6yVD-_w3ukClCm7bgNGcbfLv2OqYOzWby5pfJ-4peT4E26d6P7zqd6/s1600/hc.ospf.lab28.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhE-UddkEpEf2z2ZUx0nsrhRkAKRkBVVOLcpRXRi2t7_VyJ8aqfWvOgwPpLMHUnxDWqagzlv1UAprQ5vWTYEHg6oB6yVD-_w3ukClCm7bgNGcbfLv2OqYOzWby5pfJ-4peT4E26d6P7zqd6/s1600/hc.ospf.lab28.03.png" height="77" width="400" /></a></div>
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<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
</div>
</div>
</div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: 'Trebuchet MS', sans-serif;"> OSPF assumes that connectivity between areas will need to through backbone area. </span><span style="font-family: 'Trebuchet MS', sans-serif;">In case backbone area (area 0) is partitioned or an area lost direct connection to area 0, OSPF virtual-link or GRE tunnel can be used to enable connectivity.</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
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<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-auto-cost.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/02/ospf-virtual-link-repairing-partitioned.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-48006223737405455342014-01-31T10:35:00.001+00:002014-02-10T09:55:51.586+00:00OSPF Path Selection with Auto-Cost<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-neighbor-cost.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.co.uk/2014/02/ospf-virtual-link.html">Next</a></span></span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhihl4TBMw2WUhM5HAvlaMxBE0iYQ1p-oH_HLPGL4qDRz8axz4M0oM-2FlGl9UQ73XorTmAjSRJRhkpn2vaND5eawPCnPC4Dn5lMBDHW7DJUwtYlJXzw9xA7v1k9oVS7NGWJYIYe9Tw_2Am/s1600/ospf.25.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhihl4TBMw2WUhM5HAvlaMxBE0iYQ1p-oH_HLPGL4qDRz8axz4M0oM-2FlGl9UQ73XorTmAjSRJRhkpn2vaND5eawPCnPC4Dn5lMBDHW7DJUwtYlJXzw9xA7v1k9oVS7NGWJYIYe9Tw_2Am/s1600/ospf.25.01.png" height="281" width="400" /></a></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">Remove configuration from the previous lab.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /><b>Task 2</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">You will need to prepare for the migration towards 10Gbps. As a test, you have been asked to change the metric on R6 so that a 100Mbps link should have a metric of 100 instead of 1 (default).</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 3</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">If the result of the configuration is satisfactory, restore the default cost calculation on R6.</span><br />
<div class="separator" style="clear: both; text-align: center;">
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<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">What are the options to change OSPF metric in an consistent manner?</span></li>
</ol>
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<div style="text-align: center;">
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<div style="text-align: center;">
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below; solution contains task 1 and task 2 (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOM3NWTTA5UktFdW8/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOM3NWTTA5UktFdW8/edit?usp=sharing</a></span><br />
<br />
<div class="separator" style="clear: both;">
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Remove configuration from the previous lab.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R1 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> neighbor 172.16.0.4 cost 100</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /><b>Task 2</b></span><br />
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>You will need to prepare for the migration towards 10Gbps. As a test, you have been asked to change the metric on R6 so that a 100Mbps link should have a metric of 100 instead of 1 (default).</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R6 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> auto-cost reference-bandwidth 10000</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">Note!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;">As soon as you change the default auto-cost reference-bandwidth, you get the warning as shown below. The same configuration should be applied on all routers in the OSPF domain. In our case it is just a quick test, so we will revert this back to the default value.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
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<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - Warning.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0gGRvZbGoeTOYwDXubPNmzS26QCkZCS6XeBUvdBiQ23YS4O3ajjtirCM7Wewd5tVDaK9KvAY9MQNQ_lMgdpoCzP4JJKvD2q7KZKWJfkbVta0VFveJhpSaWVO2SwuqjDKUiRJPpAsxVHis/s1600/ospf.28.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0gGRvZbGoeTOYwDXubPNmzS26QCkZCS6XeBUvdBiQ23YS4O3ajjtirCM7Wewd5tVDaK9KvAY9MQNQ_lMgdpoCzP4JJKvD2q7KZKWJfkbVta0VFveJhpSaWVO2SwuqjDKUiRJPpAsxVHis/s1600/ospf.28.02.png" height="37" width="400" /></a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 3 - New Metric on R6.</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgb0gX4RDe6D-fv17EmQNq8MuKur9EoQUQzpUuj5614R6WrZkyMYcgCv4bbAZqerrybraSoVzG_SH55tNOIREi4rp7gbfs4FBiH0aVhQCTSSNOo4gjDmIVtcMbtnhIZRPwOmQdGybOxmVTQ/s1600/ospf.28.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgb0gX4RDe6D-fv17EmQNq8MuKur9EoQUQzpUuj5614R6WrZkyMYcgCv4bbAZqerrybraSoVzG_SH55tNOIREi4rp7gbfs4FBiH0aVhQCTSSNOo4gjDmIVtcMbtnhIZRPwOmQdGybOxmVTQ/s1600/ospf.28.03.png" height="38" width="400" /></a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 3</b><br />
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>If the result of the configuration is satisfactory, restore the default cost calculation on R6.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R6 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> auto-cost reference-bandwidth 10000</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 4 - Metric on R6 Restored.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2gN28KRatMENc4P6NB5X_DdX1EaSbfk-OqsOzbvr0li2g-fse_QnW5P8fK5QA6VVtVqk-JvXKjrJCZmyBs7ECxrzlLmAwntZ2T3B9zA_NERKp4bS_94khPQqzO10d_sdj9YwAbDH6d3rD/s1600/ospf.28.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2gN28KRatMENc4P6NB5X_DdX1EaSbfk-OqsOzbvr0li2g-fse_QnW5P8fK5QA6VVtVqk-JvXKjrJCZmyBs7ECxrzlLmAwntZ2T3B9zA_NERKp4bS_94khPQqzO10d_sdj9YwAbDH6d3rD/s1600/ospf.28.04.png" height="28" width="320" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
</div>
</div>
</div>
</div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: 'Trebuchet MS', sans-serif;">If a network designer wants to apply consistent metric in Cisco OSPF domain, there are two common solutions in use. In the first one, a consistent bandwidth-to-cost conversion table can be created similar to the one STP uses. Then, the designer can use 'ip ospf cost' command throughout the domain to manually apply the costs on every interface. Alternatively, every router can have the value of auto-cost reference-bandwidth changed using the new value (default = 100, representing 100Mbps). </span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
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</div>
<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-neighbor-cost.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.co.uk/2014/02/ospf-virtual-link.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-22999785077374819282014-01-30T13:10:00.000+00:002014-01-31T10:36:48.647+00:00OSPF Path Selection with Neighbor Cost<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-bandwidth.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-auto-cost.html">Next</a></span></span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhihl4TBMw2WUhM5HAvlaMxBE0iYQ1p-oH_HLPGL4qDRz8axz4M0oM-2FlGl9UQ73XorTmAjSRJRhkpn2vaND5eawPCnPC4Dn5lMBDHW7DJUwtYlJXzw9xA7v1k9oVS7NGWJYIYe9Tw_2Am/s1600/ospf.25.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhihl4TBMw2WUhM5HAvlaMxBE0iYQ1p-oH_HLPGL4qDRz8axz4M0oM-2FlGl9UQ73XorTmAjSRJRhkpn2vaND5eawPCnPC4Dn5lMBDHW7DJUwtYlJXzw9xA7v1k9oVS7NGWJYIYe9Tw_2Am/s1600/ospf.25.01.png" height="281" width="400" /></a></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">Remove Task 2 configuration from the previous lab.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /><b>Task 2</b></span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;">The following prefixes (marked in red rectangle) are advertised by both R3 and R4 (pic. 2). Configure R1 so that it prefers R3 towards these destinations. R4 should only be backup router in case frame-relay circuit towards R3 is down.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
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<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - Prefixes Advertised by Both R3 and R4.</span></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWwAWOvhhJixFuPXPzIJ3V-omNd_RhtwFuztanpEKhC5EmiOhMYk2fPKSxC601A_S3Vsz-7ubbD8YRJ4iLYgwvbe5tbMtBhGW1SeJJEo-XnCoktU6dH9jyCfp34pE4qZ-lfgzfazMsK-1e/s1600/ospf.27.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWwAWOvhhJixFuPXPzIJ3V-omNd_RhtwFuztanpEKhC5EmiOhMYk2fPKSxC601A_S3Vsz-7ubbD8YRJ4iLYgwvbe5tbMtBhGW1SeJJEo-XnCoktU6dH9jyCfp34pE4qZ-lfgzfazMsK-1e/s1600/ospf.27.02.png" height="192" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">If the task did not stipulate that the configuration had to be done on R1, what would be the alternative methods of accomplishing the same goal?</span></li>
</ol>
<div>
<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOak0wQ3AzUTEtaFE/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOak0wQ3AzUTEtaFE/edit?usp=sharing</a></span><br />
<br />
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Remove Task 2 configuration from the previous lab.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">interface fastethernet0/0</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> bandwidth 10</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /><b>Task 2</b></span><br />
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>The following prefixes (marked in red rectangle) are advertised by both R3 and R4 (pic. 2). Configure R1 so that it prefers R3 towards these destinations. R4 should only be backup router in case frame-relay circuit towards R3 is down.</i></span></div>
</div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">R1 Config:</span></div>
<div style="text-align: left;">
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div style="text-align: left;">
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
<div style="text-align: left;">
</div>
<div style="text-align: left;">
<span style="font-family: Courier New, Courier, monospace;"> neighbor 172.16.0.4 cost 100</span></div>
<div style="text-align: left;">
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="color: red; font-family: Trebuchet MS, sans-serif;"><b>Note!</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">This solution '</span><span style="font-family: Courier New, Courier, monospace;"><b>neighbor</b> <i>address</i> <b>cost</b> <i>value</i></span><span style="font-family: Trebuchet MS, sans-serif;">' can only be used in '<b><span style="color: red;">ospf network point-to-multipoint</span></b>' mode.</span></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - Path Verification.</span></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhieafGn4ZLNB-W6j3I6DMJ3Bk9BDSD7vKJAFv2sk81WNFnu_JPBN3hBKBe-MRVNBbffLXkKwdIqJYE_KriAo4fCTKRwDJlGXpWl96-9pGB8Vr9oDZn2_ZLLuy5Q-9LFiUXGVCz_ntrgQEk/s1600/ospf.27.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhieafGn4ZLNB-W6j3I6DMJ3Bk9BDSD7vKJAFv2sk81WNFnu_JPBN3hBKBe-MRVNBbffLXkKwdIqJYE_KriAo4fCTKRwDJlGXpWl96-9pGB8Vr9oDZn2_ZLLuy5Q-9LFiUXGVCz_ntrgQEk/s1600/ospf.27.03.png" height="162" width="400" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
</div>
</div>
</div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: 'Trebuchet MS', sans-serif;">Of course, there are usually more than one methods of accomplishing the same goal. If the task did not stipulate that configuration was supposed to be done on R1, we could change the original metric of the prefix on the advertising router(s) using the 'ip ospf cost' command. In case it was not loopback interface, we could also use the bandwidth command to manipulate the original cost calculation.</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
</div>
</div>
</div>
<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-bandwidth.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-auto-cost.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-22303250066595133652014-01-29T11:49:00.000+00:002014-01-30T13:11:40.841+00:00OSPF Path Selection with Bandwidth<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-cost.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-neighbor-cost.html">Next</a></span></span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhihl4TBMw2WUhM5HAvlaMxBE0iYQ1p-oH_HLPGL4qDRz8axz4M0oM-2FlGl9UQ73XorTmAjSRJRhkpn2vaND5eawPCnPC4Dn5lMBDHW7DJUwtYlJXzw9xA7v1k9oVS7NGWJYIYe9Tw_2Am/s1600/ospf.25.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhihl4TBMw2WUhM5HAvlaMxBE0iYQ1p-oH_HLPGL4qDRz8axz4M0oM-2FlGl9UQ73XorTmAjSRJRhkpn2vaND5eawPCnPC4Dn5lMBDHW7DJUwtYlJXzw9xA7v1k9oVS7NGWJYIYe9Tw_2Am/s1600/ospf.25.01.png" height="281" width="400" /></a></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">Remove Task 2 configuration from the previous lab.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 2</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">R2 chooses its FastEthernet interface as the outgoing path towards OSPF advertised destinations. Modify configuration on R2 so that it selects Frame-Relay interface instead. Use interface bandwidth command to accomplish this.</span><br />
<br /></div>
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">What is the significance of BW in show interface command with regard to OSPF?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">What does 'bandwidth' interface command do?</span></li>
</ol>
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<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOa1pvdlJmbUhIcXM/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOa1pvdlJmbUhIcXM/edit?usp=sharing</a></span><br />
<br />
<div class="separator" style="clear: both;">
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Remove Task 2 configuration from the previous lab.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">interface FastEthernet0/0</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> ip ospf cost 65</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
</div>
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<br /></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 2 - R2 Current OSPF Routing Table (before configuration).</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVwzGWRW8NN_YsH6TJ0BdS-ikVKZf8otcrWOoNFgWTe-W4X7jl0BQoJGjlXXTg1HNxQp5aHAOWpI3HO1xSg-3rcgmpzyjopnYWYAYzvkMTd7QU7OU7rH3eT6s4vL75HFBHdxzPa8lET4dm/s1600/hc.ospf.25.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVwzGWRW8NN_YsH6TJ0BdS-ikVKZf8otcrWOoNFgWTe-W4X7jl0BQoJGjlXXTg1HNxQp5aHAOWpI3HO1xSg-3rcgmpzyjopnYWYAYzvkMTd7QU7OU7rH3eT6s4vL75HFBHdxzPa8lET4dm/s1600/hc.ospf.25.03.png" height="150" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Note!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R2 calculates the best path based on the cost received from R1 by adding its own cost to reach R1 using two different interfaces:</span></div>
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</div>
<ul>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">FastEthernet (cost = 1)</span></li>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">Serial0/0 (cost = 64) </span></li>
</ul>
<span style="font-family: 'Trebuchet MS', sans-serif;">Let's consider prefix 172.16.13.0/24 as an example of choosing the shortest path. </span><br />
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<span style="font-family: Trebuchet MS, sans-serif;">There are two routers advertising 172.16.13.0/24:</span></div>
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</div>
<ul>
<li><span style="font-family: Trebuchet MS, sans-serif;">R1 with the cost of 64</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">R3 also with the cost of 64</span></li>
</ul>
<br />
<div class="separator" style="clear: both;">
<span style="font-family: Trebuchet MS, sans-serif;">R1 cost of serial0/1 is calculated based on the formula (</span><span style="font-family: 'Trebuchet MS', sans-serif;">10^8 = 100,000,000)</span><span style="font-family: 'Trebuchet MS', sans-serif;">:</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="color: red; font-family: Trebuchet MS, sans-serif;"><b>cost = 10^8 / bandwidth_of_interface (bps)</b></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - R1 OSPF Cost of Serial0/1.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhaKU-CzApdmp7lEbCOVPl1ZuS0Q4Zx9pWnOYEQTzociTevgN6R2gv253Ylbjot5khj3Wi8Zv7p_zzZvpmeemoRf8K9W1qqBNyN_eVUzAWOvbCzr4SSR_rAHPwhnfMJWcA_j7jM_4XtieuU/s1600/hc.ospf.lab26.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhaKU-CzApdmp7lEbCOVPl1ZuS0Q4Zx9pWnOYEQTzociTevgN6R2gv253Ylbjot5khj3Wi8Zv7p_zzZvpmeemoRf8K9W1qqBNyN_eVUzAWOvbCzr4SSR_rAHPwhnfMJWcA_j7jM_4XtieuU/s1600/hc.ospf.lab26.03.png" height="65" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">cost = 100,000,000 / 1,544,000 = <b>64</b> (rounded down)</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Similarly, R3 is advertising 172.16.13.0/24 with the cost of 64.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 4 - R3 OSPF Cost of Serial0/1.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYXgfoRCp0RNGNwW3wHq5b85aoSWvXViFMgqC9UO_dhs5hG3FYjpjwEx8oDjNGIiuQeETb3RusdcIKT59ZVUn3kHfCMfqESJwSk26bdy2PewlNHC4edl3S32VFDzInsod2UGfgX2wE_0bB/s1600/hc.ospf.lab26.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYXgfoRCp0RNGNwW3wHq5b85aoSWvXViFMgqC9UO_dhs5hG3FYjpjwEx8oDjNGIiuQeETb3RusdcIKT59ZVUn3kHfCMfqESJwSk26bdy2PewlNHC4edl3S32VFDzInsod2UGfgX2wE_0bB/s1600/hc.ospf.lab26.04.png" height="62" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">R2 chooses the least cost path:</span></div>
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</div>
<ul>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">R2--->R1 (FastEthernet0/0), then R1's directly connected destination</span></li>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">R2--->R1(Serial0/0), then </span><span style="font-family: 'Trebuchet MS', sans-serif;">R1's directly connected destination</span></li>
</ul>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">It is worth noting that R1 has 172.16.13.0/24 directly connected (serial0/1) but can also reach it through R3 using its Serial0/1). It calculates the least cost path as well.</span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">Take a closer look at the topology to understand it.</span></div>
<br />
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<span style="font-family: 'Trebuchet MS', sans-serif; text-align: center;"><br /></span></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 2</b></div>
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>R2 chooses its FastEthernet interface as the outgoing path towards OSPF advertised destinations. Modify configuration on R2 so that it selects Frame-Relay interface instead. Use interface bandwidth command to accomplish this.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<br />
<div style="text-align: left;">
<span style="font-family: 'Trebuchet MS', sans-serif;">R2 Config:</span></div>
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">interface fastethernet0/0</span><br />
<span style="font-family: Courier New, Courier, monospace;"> bandwidth 10</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">The cost of FastEthernet0/0 changes from initial 1 to 10000 (10 here is 10 kbps):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<br />
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 5 - New OSPF Cost of FastEthernet0/0.</span></div>
<div style="text-align: center;">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfH1pwqXIv9Q2G7DYtG0UsBgwjJZmG-gRrUOD0Vva75SL3SC9GqatbR4VNllEuOu-ofIBvjsiwNM-idtNNrP_QR_dPxXFuLaoKv57v_jKQdkXsL_N9z2pPWpFFNR4EPfEL7Hc2BKWPqsKD/s1600/hc.ospf.lab26.05.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfH1pwqXIv9Q2G7DYtG0UsBgwjJZmG-gRrUOD0Vva75SL3SC9GqatbR4VNllEuOu-ofIBvjsiwNM-idtNNrP_QR_dPxXFuLaoKv57v_jKQdkXsL_N9z2pPWpFFNR4EPfEL7Hc2BKWPqsKD/s1600/hc.ospf.lab26.05.png" height="65" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Now, R2 selects Serial0/0 as the best path:</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<br />
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 6 - R2's OSPF Routing Table.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwbopkYbdLcbJJJeVqXSEPLAzKm_hHg5TAhFhyphenhypheneV5BgvLHpZdWWR_T30zCSJkG_qrVi3eMIBeorvIxbDYTSQl6xL7reAHOo7qGkNvc09a9cA2ujXqwSP-Hi0YI1Djdx18iwivr_iqXCzfH/s1600/hc.ospf.lab26.06.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwbopkYbdLcbJJJeVqXSEPLAzKm_hHg5TAhFhyphenhypheneV5BgvLHpZdWWR_T30zCSJkG_qrVi3eMIBeorvIxbDYTSQl6xL7reAHOo7qGkNvc09a9cA2ujXqwSP-Hi0YI1Djdx18iwivr_iqXCzfH/s1600/hc.ospf.lab26.06.png" height="168" width="400" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: 'Trebuchet MS', sans-serif;">The interface keyword 'bandwidth' followed by the number of kbps is NOT going to throttle the actual traffic. The rate stays the same. It only affects path selection routing protocols use (EIGRP and OSPF which factor in the bandwidth in the calculation).</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">This concept requires a bit of theory but also some hands-on verification in LSDB. Try to look at this from the practical perspective by looking in OSPF databases of R1 and R2.</span><br />
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<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-cost.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-neighbor-cost.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-58392450551920937142014-01-28T15:54:00.000+00:002014-01-29T11:50:10.491+00:00OSPF Path Selection with Cost<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-conditional-default-routing-using.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-bandwidth.html">Next</a></span></span></span></div>
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<span style="font-family: "Trebuchet MS", sans-serif;">Pic. 1 - Topology Diagram.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhihl4TBMw2WUhM5HAvlaMxBE0iYQ1p-oH_HLPGL4qDRz8axz4M0oM-2FlGl9UQ73XorTmAjSRJRhkpn2vaND5eawPCnPC4Dn5lMBDHW7DJUwtYlJXzw9xA7v1k9oVS7NGWJYIYe9Tw_2Am/s1600/ospf.25.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhihl4TBMw2WUhM5HAvlaMxBE0iYQ1p-oH_HLPGL4qDRz8axz4M0oM-2FlGl9UQ73XorTmAjSRJRhkpn2vaND5eawPCnPC4Dn5lMBDHW7DJUwtYlJXzw9xA7v1k9oVS7NGWJYIYe9Tw_2Am/s1600/ospf.25.01.png" height="281" width="400" /></a></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">Configure OSPF area 0 between R1 and R2 using Frame-Relay connection (Ser0/0).</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task 2</b></span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;">After you have completed Task1, check OSPF path on R2 towards the rest of the OSPF domain (check next-hop router's address). Configure R2 to use the newly created Frame-Relay link as the best path. Use interface cost command to accomplish this.</span><br />
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">How does OSPF calculate the metric on Cisco routers by default?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">How can you influence the path selection in OSPF?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">How does Cisco OSPF router calculate the cost by default (as of writing this post)?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">How would you configure support so that the higher than 100Mbps interfaces have their cost automatically calculated?</span></li>
</ol>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZORlpIR0RDNnU5QW8/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZORlpIR0RDNnU5QW8/edit?usp=sharing</a></span><br />
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<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Configure OSPF area 0 between R1 and R2 using Frame-Relay connection (Ser0/0).</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">Notice!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;">It is a good idea to check how R1 is already configured (ospf mode, authentication etc.) in order to configure R2 properly on Frame-Relay link.</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">R1 Current Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> log-adjacency-changes</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="background-color: yellow;">area 0 authentication</span></span><br />
<span style="font-family: Courier New, Courier, monospace;"> network 10.0.1.1 0.0.0.0 area 0</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="background-color: yellow;">network 172.16.0.0 0.0.0.255 area 0</span></span><br />
<span style="font-family: Courier New, Courier, monospace;"> network 172.16.13.1 0.0.0.0 area 13</span><br />
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;"></span><br />
<div>
<span style="font-family: Courier New, Courier, monospace;">interface FastEthernet0/0</span></div>
<span style="font-family: Courier New, Courier, monospace;">
</span>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 172.16.12.1 255.255.255.0</span></div>
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</span>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="background-color: yellow;">ip ospf authentication null</span></span></div>
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</span>
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<span style="font-family: Courier New, Courier, monospace;"> ip ospf 1 area 0</span></div>
<span style="font-family: Courier New, Courier, monospace;">
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speed 100</div>
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full-duplex</div>
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!</div>
</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface Serial0/0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 172.16.0.1 255.255.255.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> encapsulation frame-relay</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="background-color: yellow;">ip ospf authentication-key G33K</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="background-color: yellow;">ip ospf network point-to-multipoint</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;"> clock rate 2000000</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.1 103</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.3 103 broadcast</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.4 104 broadcast</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> no frame-relay inverse-arp</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Notice!</span></div>
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<ul>
<li><span style="font-family: Trebuchet MS, sans-serif;">R1 uses simple password authentication in area 0 but it is disabled on Fas0/0.</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">R1 does not have Frame-Relay IP mapping towards R2 (R2 has this mapping towards R3; not shown here).</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">R1 ospf mode is point-to-multipoint</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">R1 authentication key = G33K</span></li>
</ul>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R1 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface serial0/0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> frame-relay map ip 172.16.0.2 102 broadcast</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface serial0/0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip ospf authentication</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip ospf authentication-key G33K</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip ospf network point-to-multipoint</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip ospf 1 area 0</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - OSPF Neighborship Verification.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPWTKGmd4CnZo4CvLh7Ci6VsV1eHkMYIJep7kNTX0N-CqANCNcQi5qyqrzIa1Ud4ejAFMomf2FPquoxbNnA9GxcJx8KSwVjnzlDbJJIwYYCCQZwgNErNkCBVB4atgdJwdKTmkViMTZAMgz/s1600/hc.ospf.25.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPWTKGmd4CnZo4CvLh7Ci6VsV1eHkMYIJep7kNTX0N-CqANCNcQi5qyqrzIa1Ud4ejAFMomf2FPquoxbNnA9GxcJx8KSwVjnzlDbJJIwYYCCQZwgNErNkCBVB4atgdJwdKTmkViMTZAMgz/s1600/hc.ospf.25.02.png" height="55" width="400" /></a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task 2</b></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><i><span style="color: #0b5394;">After you have completed Task1, check OSPF path on R2 towards the rest of the OSPF domain (check next-hop router's address). Configure R2 to use the newly created Frame-Relay link as the best path. Use interface cost command to accomplish this.</span></i></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 3 - R2's Routing Table.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRaXkNg68qh4qWiVjssII3bsF4U1nRBBQGEw2mHx0yWuuEeXpTRFQifX8UBcgTE1ofutKHA-v3jw30-grbyjfrOkHNdDIxaTpJiJiiqmeuIwMw9ohlMgDiMGgzrH04Gq5oadYWFSL2wqkk/s1600/hc.ospf.25.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRaXkNg68qh4qWiVjssII3bsF4U1nRBBQGEw2mHx0yWuuEeXpTRFQifX8UBcgTE1ofutKHA-v3jw30-grbyjfrOkHNdDIxaTpJiJiiqmeuIwMw9ohlMgDiMGgzrH04Gq5oadYWFSL2wqkk/s1600/hc.ospf.25.03.png" height="150" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Notice!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">For all OSPF destination R2 uses FastEthernet0/0 as expected.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 4 - R2's OSPF Costs of Interfaces.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">The last thing to complete the goal is to change the cost of the interface preferring Serial0/0.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span></div>
<div style="text-align: left;">
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div style="text-align: left;">
<span style="font-family: Courier New, Courier, monospace;">interface FastEthernet0/0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip ospf cost 65</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 5 - R2's Current Routing Table (after few seconds).</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLDKD0iBEhtav67Mwa0Z7GkVERIt2k-ceX2VTfIlTWpiDXM3SS4ysiwX3nOZg5wa8KLmPO44b8IbI_KEcchbCqezQq5Ae1YiBEcB45MXny3dnha-3LwZXXc1kaaXXWh5-7VSmGKMm1lxSV/s1600/hc.ospf.25.05.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLDKD0iBEhtav67Mwa0Z7GkVERIt2k-ceX2VTfIlTWpiDXM3SS4ysiwX3nOZg5wa8KLmPO44b8IbI_KEcchbCqezQq5Ae1YiBEcB45MXny3dnha-3LwZXXc1kaaXXWh5-7VSmGKMm1lxSV/s1600/hc.ospf.25.05.png" height="165" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R2 prefers Serial0/0 as its outgoing interface for all OSPF networks.</span></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br />There are bunch of methods to influence the path selection process in OSPF:</span><br />
<ul>
<li><span style="font-family: Trebuchet MS, sans-serif;">ip ospf cost</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">auto-cost reference-bandwidth</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">bandwidth</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">summarization a range of prefixes</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">neighbor costs (working in certain ospf modes)</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">etc.</span></li>
</ul>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">It is worth mentioning that OSPF will calculate the cost based on the reference bandwidth (value of 100 representing 100,000,000 bps by default) according to the formula:</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">cost = ref_band / bandwidth_of_the_link.</span></div>
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<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-conditional-default-routing-using.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-bandwidth.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-77047866991427189172014-01-24T09:03:00.000+00:002014-01-28T15:55:28.338+00:00OSPF Conditional Default Routing Using IP SLA<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-conditional-default-routing.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-cost.html">Next</a></span></span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
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<span style="font-family: "Trebuchet MS", sans-serif;">Pic. 1 - Topology Diagram.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s1600/ospf.15.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s400/ospf.15.01.png" height="281" width="400" /></a></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><b><br /></b></span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">Remove the configuration used in the previous lab.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 2</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">On R2 configure a static route towards 10.0.8.8/32.</span><br />
<br />
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 3</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">Configure R2 so that it advertises the default route into OSPF domain as long as there is connectivity between R2 and SW2 Loopback0 interface (10.0.8.8). You should use IP SLA to accomplish the goal. IP SLA should track the object that will perform ping test every 3 seconds and the timeout should be set to 2 seconds.</span><br />
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">What is an advantage of using this solution?</span></li>
</ol>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOMUhnSmdRRFdER0E/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOMUhnSmdRRFdER0E/edit?usp=sharing</a></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<br />
<div class="separator" style="clear: both;">
<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Remove the configuration used in the previous lab.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip prefix-list VLAN28</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> route-map CHECK</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> default-information originate</span><br />
<br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 2</b></span><br />
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>On R2 configure a static route towards 10.0.8.8/32.</i></span><br />
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">ip route 10.0.8.8 255.255.255.255 172.16.28.8</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<br />
<span style="color: red; font-family: Trebuchet MS, sans-serif;"><b>Note!</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">Make sure that SW2 has these two static routes configured for the next task to succeed.</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">ip route 172.16.0.0 255.255.0.0 172.16.28.2</span><br />
<span style="font-family: Courier New, Courier, monospace;">ip route 10.0.0.0 255.255.0.0 172.16.28.2</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<br />
<span style="font-family: Trebuchet MS, sans-serif;">Also, make sure that R2's FastEthernet is UP (we brought it down in the previous lab for testing purposes).</span><br />
<br /></div>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 3</b></span><br />
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Configure R2 so that it advertises the default route into OSPF domain as long as there is connectivity between R2 and SW2 Loopback0 interface (10.0.8.8). You should use IP SLA to accomplish the goal. IP SLA should track the object that will perform ping test every 3 seconds and the timeout should be set to 2 seconds.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="color: red; font-family: Trebuchet MS, sans-serif;"><b>NOTE!</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">Depending on which IOS version you use, the syntax to configure ip sla probe may be different. Try to check the syntax using: ip sla ?</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">ip sla 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> icmp-echo 10.0.8.8</span><br />
<span style="font-family: Courier New, Courier, monospace;"> timeout 2000</span><br />
<span style="font-family: Courier New, Courier, monospace;"> frequency 3</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
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<span style="font-family: Courier New, Courier, monospace;">ip sla schedule 1 life forever start-time now</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - IP SLA Activated.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIJRYIbdRXFy-P7_Tto_OABJWZeo8CKMQU5mDUOyFvE7UcT_MsksimQ-T-3yzL_-38jxgNU7f315xlCqhmIm8ivTI04StwvxhHDKX1LUMF3nKhnq9vk02zBKOZiCLr6yJgnxeMw3n0IlJA/s1600/ospf.24.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIJRYIbdRXFy-P7_Tto_OABJWZeo8CKMQU5mDUOyFvE7UcT_MsksimQ-T-3yzL_-38jxgNU7f315xlCqhmIm8ivTI04StwvxhHDKX1LUMF3nKhnq9vk02zBKOZiCLr6yJgnxeMw3n0IlJA/s1600/ospf.24.02.png" height="111" width="400" /></a></div>
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<b style="font-family: 'Trebuchet MS', sans-serif;">Notice!</b></div>
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<span style="font-family: Trebuchet MS, sans-serif;">My router's date and time are not set properly.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">track 1 rtr 1</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">ip route 1.1.1.1 255.255.255.255 Null0 track 1</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">ip prefix-list FAKE_NETWORK permit 1.1.1.1/32</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">route-map TRACK_FAKE_NETWORK permit 10</span><br />
<span style="font-family: Courier New, Courier, monospace;"> match ip address prefix-list FAKE_NETWORK</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> default-information originate always route-map TRACK_FAKE_NETWORK</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Note!</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">This solution requires the presence of a bogus/fake network entry in the routing table (here: 1.1.1.1/32). This is the condition for default route advertisement.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">As long as 1.1.1.1/32 is present in the routing table, R2 advertises the default route into OSPF. This entry (1.1.1.1/32) will be present in the routing table as long as object 1 receives success from IP SLA 1 probe. </span><br />
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - R1 Receives Default Route.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgp004r4WemeMmt5vjYuT6qfpR1wcB6ju0-zTqkCG6ohiRwQoWndFGeqWJ8AfXB7MGcxYV3inZtQ9eVxkKWDWS40o8HL6KGsJR3J0IYfsB8Cq1dVUvTcdap5yuSCosE_RfwkxiYGz4QjOBE/s1600/ospf.24.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgp004r4WemeMmt5vjYuT6qfpR1wcB6ju0-zTqkCG6ohiRwQoWndFGeqWJ8AfXB7MGcxYV3inZtQ9eVxkKWDWS40o8HL6KGsJR3J0IYfsB8Cq1dVUvTcdap5yuSCosE_RfwkxiYGz4QjOBE/s1600/ospf.24.03.png" height="86" width="400" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br />This is a more reliable method of injecting a default route into OSPF since it will rely on non-direct failure.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">Perform the test by shutting down 10.0.8.8 on SW2. See, if the default route has been withdrawn. Below, is what happens to IP SLA when SW2 shuts down its loopback0 interface.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 4 - IP SLA Statistics on R2 (SW2 Loopack Down).</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjR8Wk0ohq-RVcHFbnFzNnI1ahXN4vyKWNhYaJcrx9RkZUbTYuSgq_05dKBKysnuwGwavlOPbr-4mOgl4PdpQHdh_eZXhdKIwOcsRxlQivdaWoiA3hPiqyMRrqUkVUwAEynEh1QagBv1z1H/s1600/ospf.24.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjR8Wk0ohq-RVcHFbnFzNnI1ahXN4vyKWNhYaJcrx9RkZUbTYuSgq_05dKBKysnuwGwavlOPbr-4mOgl4PdpQHdh_eZXhdKIwOcsRxlQivdaWoiA3hPiqyMRrqUkVUwAEynEh1QagBv1z1H/s1600/ospf.24.04.png" height="141" width="400" /></a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
<span style="font-family: Trebuchet MS, sans-serif;">As a result of that, 1.1.1.1/32 disappears from the routing table on R2.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<br />
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 5 - 1.1.1.1/32 is Missing.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyj-rbaVZBVYAJDHTa0ROeqRXABoJXz-4EZ1H-RksQvnpe_U7U3xI3ehvz3D_vAutWKn82sZgMO7pZ6nfJfagwc6FbQh3WfWhTeT06K6nszs_XSQNlTvtDmrbr_ss-NCSos7WfEV_Fdvz1/s1600/ospf.24.05.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyj-rbaVZBVYAJDHTa0ROeqRXABoJXz-4EZ1H-RksQvnpe_U7U3xI3ehvz3D_vAutWKn82sZgMO7pZ6nfJfagwc6FbQh3WfWhTeT06K6nszs_XSQNlTvtDmrbr_ss-NCSos7WfEV_Fdvz1/s1600/ospf.24.05.png" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<span style="font-family: 'Trebuchet MS', sans-serif;">And R2 stops advertising the default route.</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
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<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 6 - R1 Loses Default Route.</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgu5PVvAzmNiXi1fFH00KQNLXBegjltJx9qw9I7Miojy2BY6nXoUpwpPv8Vtq2IXbhka94QUJ4Kl476_BeMnF8krIvsRavfju55ZVXov4gruw7_jfnQFfQrWbeOXFrMBIH5MHPCSpywHr7e/s1600/ospf.24.06.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgu5PVvAzmNiXi1fFH00KQNLXBegjltJx9qw9I7Miojy2BY6nXoUpwpPv8Vtq2IXbhka94QUJ4Kl476_BeMnF8krIvsRavfju55ZVXov4gruw7_jfnQFfQrWbeOXFrMBIH5MHPCSpywHr7e/s1600/ospf.24.06.png" height="72" width="320" /></a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
<span style="font-family: Trebuchet MS, sans-serif;">As soon as connectivity to 10.0.8.8 is restored, the default route R2 advertises into OSPF again.</span><br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span></div>
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</div>
<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-conditional-default-routing.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-path-selection-with-cost.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-33090376018721656652014-01-23T08:40:00.000+00:002014-01-24T09:06:37.811+00:00OSPF Conditional Default Routing<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-summarization-discard-route.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-conditional-default-routing-using.html">Next</a></span></span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
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<span style="font-family: "Trebuchet MS", sans-serif;">Pic. 1 - Topology Diagram.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s1600/ospf.15.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s400/ospf.15.01.png" height="281" width="400" /></a></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">Remove the configuration used in the previous lab.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 2</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">Remove the existing default route injection on R2 (including default static route).</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 3</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">Configure R2 to generate a default route into OSPF assuming that 172.16.28.0/24 is present in its routing table.</span><br />
<br /></div>
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">How can OSPF inject the default route based on the presence of specific route entry in its routing table?</span></li>
</ol>
<div>
<div style="text-align: center;">
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<div style="text-align: center;">
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOVFZYQzlZQjQydUk/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOVFZYQzlZQjQydUk/edit?usp=sharing</a></span><br />
<br />
<br />
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<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Remove the configuration used in the previous lab.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> access-list 1</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> distribute-list 1 in</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> area 0 range 10.0.0.0 255.255.252.0</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">discard-route internal</span></span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
</div>
<div style="text-align: left;">
<br /></div>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 2</b></span><br />
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Remove the existing default route injection on R2 (including default static route).</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip route 0.0.0.0 0.0.0.0 172.16.28.8</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;"> no</span> default-information originate</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<br />
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - R1's Routing Table.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhSZRm9u-kUPHJoRLQ2vlSShnJ6GF-gF3Or9arcWrX0s7cj2E2ME6-2VBDeSCCT635vqRjgP-5HSMN2hA_7y9fS3CaDmO7aI1ohVP2GLZZOEZY_oXgVlH0vNZLDptzxvG7a-OqgEUc-OShg/s1600/ospf.23.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhSZRm9u-kUPHJoRLQ2vlSShnJ6GF-gF3Or9arcWrX0s7cj2E2ME6-2VBDeSCCT635vqRjgP-5HSMN2hA_7y9fS3CaDmO7aI1ohVP2GLZZOEZY_oXgVlH0vNZLDptzxvG7a-OqgEUc-OShg/s1600/ospf.23.02.png" height="90" width="400" /></a></div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 3</b><br />
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Configure R2 to generate a default route into OSPF assuming that 172.16.28.0/24 is present in its routing table.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">ip prefix-list VLAN28 permit 172.16.28.0/24</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">route-map CHECK permit 10</span><br />
<span style="font-family: Courier New, Courier, monospace;"> match ip address prefix-list VLAN28</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> default-information originate always route-map CHECK</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - R1's Routing Table.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-t9yA1HwAdlchVasOU95kxRlRP4FcRZp5Iwy3D3qRHHW-lf_LbL24ETY3JDPOzFQD1nqG-fD2NXFlzJKSEgGnnhdgO3y9j_wa9PcOqhafZHhqV15cTg7PNuL-FnifvpAt0Jm23aYlviaq/s1600/ospf.23.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-t9yA1HwAdlchVasOU95kxRlRP4FcRZp5Iwy3D3qRHHW-lf_LbL24ETY3JDPOzFQD1nqG-fD2NXFlzJKSEgGnnhdgO3y9j_wa9PcOqhafZHhqV15cTg7PNuL-FnifvpAt0Jm23aYlviaq/s1600/ospf.23.03.png" height="42" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Now, in order to simulate the removal, shutdown FastEthernet0/1 on R2. It should no longer propagate the default route.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 4 - R2 Loses access to 172.16.28.0/24.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7nw8uk5G9uYRZTxY-iGAqX-hzg0B3EcHTZxK9woWV_VKwT-rK3X1iR5MQYA2kqt28Q2DSpP1MYXfE7-Lbl40BXpp2PFfXGhBLQwWJ28YSZFBZdnJJXlYbljseej28XXSs_FDxTOOOkvSW/s1600/ospf.23.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7nw8uk5G9uYRZTxY-iGAqX-hzg0B3EcHTZxK9woWV_VKwT-rK3X1iR5MQYA2kqt28Q2DSpP1MYXfE7-Lbl40BXpp2PFfXGhBLQwWJ28YSZFBZdnJJXlYbljseej28XXSs_FDxTOOOkvSW/s1600/ospf.23.04.png" height="63" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">As a result of that, R1 no longer receives the default route from R2. This can be seen in the 'debug ip routing' on R1 activated before R2 shut down it Fas0/1 interface.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 5 - Debug IP Routing on R1 Before R2's Fas0/1 Shutdown.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-yNcQVjDXfX1SMLzEvleDe90DyFoP8bhdD9F1rF88jGOc2DyN3zuReT_MBeD7VjUfY6eS9H3qr3PICe3vfYIOLv5cT18A4GNmKhKOA0LQIwgvXxd8E3Wlkb3X6OIuc6RBQB6R93W-afbq/s1600/ospf.23.05.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-yNcQVjDXfX1SMLzEvleDe90DyFoP8bhdD9F1rF88jGOc2DyN3zuReT_MBeD7VjUfY6eS9H3qr3PICe3vfYIOLv5cT18A4GNmKhKOA0LQIwgvXxd8E3Wlkb3X6OIuc6RBQB6R93W-afbq/s1600/ospf.23.05.png" height="100" width="400" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br />OSPF command 'default-information originate' is already a conditional route injection. It will originate the default route into OSPF if the router has the default route itself. In case, the router with </span><span style="font-family: 'Trebuchet MS', sans-serif;">'default-information originate' command loses the default route from its routing table, it will withdrawn the default route from OSPF domain.</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">OSPF can also originate the default route, without having it in its routing table. You need to add the </span><span style="font-family: 'Trebuchet MS', sans-serif;">'default-information originate <b><span style="color: red;">always</span></b>' keyword (the one in red), to originate the default route unconditionally.</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">However, OSPF also uses conditional default route injection method in which the router will check for presence of any prefix specified in the route-map, just like presented in this lab.</span><br />
<br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span></div>
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</div>
<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-summarization-discard-route.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-conditional-default-routing-using.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-92223782288147227132014-01-22T08:29:00.002+00:002014-01-23T08:41:48.686+00:00OSPF Summarization - Discard Route<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-default-route.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-conditional-default-routing.html">Next</a></span></span></span></div>
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<span style="font-family: "Trebuchet MS", sans-serif;">Pic. 1 - Topology Diagram.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s1600/ospf.15.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s400/ospf.15.01.png" height="281" width="400" /></a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b><span style="color: red;">NOTE!</span></b></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Make sure that the tasks in the previous lab are completed before proceeding with this lab. Also, this is NOT a best practice lab. It creates a potential problem and provides solution to it.</span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><b><br /></b></span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: 'Trebuchet MS', sans-serif;">On R4 configure distribute-list filtering area 0 prefixes so that they are still present in the LSDB but not in the routing table of R4. Prefixes to be filtered out are as follows:</span><br />
<ul>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">10.0.1.1/32</span></li>
<li><span style="font-family: 'Trebuchet MS', sans-serif;">10.0.2.2/32.</span></li>
</ul>
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 2</b><br />
<span style="font-family: "Trebuchet MS",sans-serif;">Configure summary route 10.0.0.0/22 on R4 so that the area 3 does not receive more specific LSAs in the range given (10.0.0.0 - 10.0.3.255).</span><br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span>
<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 3</b></span><br />
<span style="font-family: "Trebuchet MS",sans-serif;">Ensure that R5 has connectivity to the routes summarized by R4. Configure R4 to accomplish this.</span><br />
<br /></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Questions</span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">What problem can prefix summarization create in OSPF domain?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">What do OSPF, EIGRP and BGP create in their routing table while doing route summarization?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">What does Null0 summary is designed to do?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">What problem is this task list going to create?</span></li>
</ol>
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<div style="text-align: center;">
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<div style="text-align: center;">
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOang4ZTFwcXNpZEE/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOang4ZTFwcXNpZEE/edit?usp=sharing</a></span><br />
<br />
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<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: 'Trebuchet MS', sans-serif;"><i><span style="color: #0b5394;">On R4 configure distribute-list filtering area 0 prefixes so that they are still present in the LSDB but not in the routing table of R4. Prefixes to be filtered out are as follows:</span></i></span><br />
<br />
<ul>
<li><span style="font-family: 'Trebuchet MS', sans-serif;"><i><span style="color: #0b5394;">10.0.1.1/32</span></i></span></li>
<li><span style="font-family: 'Trebuchet MS', sans-serif;"><i><span style="color: #0b5394;">10.0.2.2/32.</span></i></span></li>
</ul>
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 2 - R4's OSPF Table Before Filtering.</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiE0fZ_hN_P0Y_1vbgFyCbrURmgrvKeFvxTVLgmhKT3s3n6yUyHSKmVAYq4T0_8TymmbQW2dUTvWEBykYDPWe3oIRMpJ-8qe_y6b2rdsIa0WrXbe86sJQ6hntsfr_um-Ns7-W2K9B60IMQf/s1600/ospf.22.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiE0fZ_hN_P0Y_1vbgFyCbrURmgrvKeFvxTVLgmhKT3s3n6yUyHSKmVAYq4T0_8TymmbQW2dUTvWEBykYDPWe3oIRMpJ-8qe_y6b2rdsIa0WrXbe86sJQ6hntsfr_um-Ns7-W2K9B60IMQf/s1600/ospf.22.02.png" height="90" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;">R4 Config:</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">access-list 1 deny 10.0.1.1</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">access-list 1 deny 10.0.2.2</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">access-list 1 permit any</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> distribute-list 1 in</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - </span><span style="font-family: 'Trebuchet MS', sans-serif; text-align: center;">R4's OSPF Table After Filtering.</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif; text-align: center;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7td9DwjuP1gjgS5TvsKGHmF3hS9r2qgozLSpUm7EPiI5y7EFR0b8GQtwz3dYFbdZ8_ww_TndJLnwC3h6JJ-i5JrinX1rITNylqA7SbvTUu_yfRCBzTBfsdSCPeRBuOgimzn2YRmmTTuOj/s1600/ospf.22.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7td9DwjuP1gjgS5TvsKGHmF3hS9r2qgozLSpUm7EPiI5y7EFR0b8GQtwz3dYFbdZ8_ww_TndJLnwC3h6JJ-i5JrinX1rITNylqA7SbvTUu_yfRCBzTBfsdSCPeRBuOgimzn2YRmmTTuOj/s1600/ospf.22.03.png" height="75" width="400" /></a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif; text-align: center;"><br /></span></div>
<div>
<span style="font-family: 'Trebuchet MS', sans-serif; text-align: center;">10.0.1.1/32 and 10.0.2.2/32 are now missing (but they are still in LSDB).</span></div>
<br />
<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 2</b></span><br />
<span style="color: #0b5394; font-family: "Trebuchet MS",sans-serif;"><i>Configure summary route 10.0.0.0/22 on R4 so that the area 3 does not receive more specific LSAs in the range given (10.0.0.0 - 10.0.3.255).</i></span><br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span>
<span style="font-family: "Trebuchet MS",sans-serif;">R4 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> area 0 range 10.0.0.0 255.255.252.0</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span>
<br />
<div style="text-align: center;">
<span style="font-family: "Trebuchet MS",sans-serif;">Pic. 4 - OSPF Routing Table on R4.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg160N_hlEMMH4XCko50m_6BCIW-2TxJzOZ5op49EfR4D93CJcNGt6xOU0sKo6RWtFm1FEMilXPjo3DxTewb2RUy0QLupA5YIdoh9j8ofECKmJSit6NWGz2iVxF4NohPg8vfJ3WBAv7CpHj/s1600/ospf.22.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg160N_hlEMMH4XCko50m_6BCIW-2TxJzOZ5op49EfR4D93CJcNGt6xOU0sKo6RWtFm1FEMilXPjo3DxTewb2RUy0QLupA5YIdoh9j8ofECKmJSit6NWGz2iVxF4NohPg8vfJ3WBAv7CpHj/s1600/ospf.22.04.png" height="136" width="400" /></a></div>
<div style="text-align: center;">
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span></div>
<b style="font-family: 'Trebuchet MS', sans-serif;">NOTE!</b><br />
<span style="font-family: 'Trebuchet MS', sans-serif;">R4 has the default route as per previous lab, but since summarization has been configured, it also creates 10.0.0.0/22 summary route pointing to Null0 interface (default behavior of OSPF, EIGRP, BGP).</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 3</b></div>
</div>
<i><span style="color: #0b5394;"><span style="font-family: 'Trebuchet MS', sans-serif;">Ensure that R5 has connectivity to the routes summarized by R4. Configure R4 to accomplish this</span><span style="font-family: 'Trebuchet MS', sans-serif;">.</span></span></i><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<br />
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 5 - R5's Routing Table After R4's Summarization.</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgULOCgqVFGQEIfwYn0_RjY_0E8w8b5ggbWnSubXguM5YH3WVGV-eeUgjxKDXaglnR7wZvwjZrTo-8syGJ4wDkp7puPkDPBrq3OxcTiJVuhaRaxgdD2wkycTg66utaopeymG974fEjHgFe_/s1600/ospf.22.05.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgULOCgqVFGQEIfwYn0_RjY_0E8w8b5ggbWnSubXguM5YH3WVGV-eeUgjxKDXaglnR7wZvwjZrTo-8syGJ4wDkp7puPkDPBrq3OxcTiJVuhaRaxgdD2wkycTg66utaopeymG974fEjHgFe_/s1600/ospf.22.05.png" height="168" width="400" /></a></div>
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
<span style="font-family: 'Trebuchet MS', sans-serif;">R5 receives the summary route 10.0.0.0/22 as presented in pic 5. When it sends packets towards 10.0.1.1 or 10.0.2.2 it sends the packets to the next-hop router 172.16.45.4 (R4). Here's the result of the ping test:</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<br />
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 6 - R5 Ping Test to Summarized Prefixes.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhA-SRVJ9HdbqWq6agmgGdAn-HTF1JN15CBkfMHGt396_79JGOeFQL_gfns798c6qE0iB-RIkaCPwkkuiWLE1uaM0qN8QrTFCdN6hEy0wXdL7HsLOA7NpYp7juqiQRiTdusRKFqCsh0cF1g/s1600/ospf.22.06.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhA-SRVJ9HdbqWq6agmgGdAn-HTF1JN15CBkfMHGt396_79JGOeFQL_gfns798c6qE0iB-RIkaCPwkkuiWLE1uaM0qN8QrTFCdN6hEy0wXdL7HsLOA7NpYp7juqiQRiTdusRKFqCsh0cF1g/s1600/ospf.22.06.png" height="172" width="400" /></a></div>
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
<span style="font-family: 'Trebuchet MS', sans-serif;">R4 sends ICMP host unreachable to R5!</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">R4 has the summary route with Null0 interface as the next hop for more specific routes (10.0.0.0 - 10.0.3.255 in this case). This summary route pointing to Null0 interface assumes that R4 has more specific entries in the routing table (filtering in task 1 has removed those entries from the routing table). Even though R4 has the default route It will NOT use it due to the presence of summary route. Packets are being dropped on R4 creating a black hole.</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">Solution to this 'unorthodox' design could be removal the discard route (null0) from the routing table:</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">R4 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> no discard-route internal</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">This will remove the discard route (null0) from OSPF routing table (compare with pic. 4).</span><br />
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 7 - OSPF Routing Table on R4.</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4EuOPg7-UVojMe9m5AWF3vyNhcLLANcACiAI-gCRa20aP7CKs_BXx5mpy3JJDblnORzylUL4tZRh9c7a8mUJHTe3vlfxqYUJSMOH90M1uaMCx6PDNMIlSWQWrNhGPXEkaA2RImyOWxmM4/s1600/ospf.22.07.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4EuOPg7-UVojMe9m5AWF3vyNhcLLANcACiAI-gCRa20aP7CKs_BXx5mpy3JJDblnORzylUL4tZRh9c7a8mUJHTe3vlfxqYUJSMOH90M1uaMCx6PDNMIlSWQWrNhGPXEkaA2RImyOWxmM4/s1600/ospf.22.07.png" height="131" width="400" /></a></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b>NOTE!</b></span></div>
<div style="text-align: left;">
<span style="font-family: 'Trebuchet MS', sans-serif;">Only default route is present now.</span></div>
<div style="text-align: left;">
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 8 - R5 Ping Test.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9vgkGJxriQgGrXIUvFS9FoEkfAOunFTUFQtgtTPJqADezSxQqkTmvZfCcIMC_YtyuDev6I6Q0DU415MUYaZfkpEwC1gF31XN-sMLIHYb3Poo4kUfhYq3AqbLPskntFyCaxvPc0JKfNWLs/s1600/ospf.22.08.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9vgkGJxriQgGrXIUvFS9FoEkfAOunFTUFQtgtTPJqADezSxQqkTmvZfCcIMC_YtyuDev6I6Q0DU415MUYaZfkpEwC1gF31XN-sMLIHYb3Poo4kUfhYq3AqbLPskntFyCaxvPc0JKfNWLs/s1600/ospf.22.08.png" height="132" width="400" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
</div>
</div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br />While using route summarization it is possible to create a 'black hole' for the traffic or sub-optimal routing in the domain. It is imperative to remember that route summarization introduces a summary route with the Null0 interface as the next hop. It is called 'discard route'. It prevents a router from using a shorter match (default route for instance), if the more specific destination network is not present in the routing table. </span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">In this lab, the problem has been introduced which resulted exactly as per 'discard route' role. This design if definitely not the best practice. It only shows the possibility of removing the 'discard route' from OSPF table in order to accomplish the task given stipulations.</span><br />
<br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span></div>
</div>
</div>
</div>
<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-default-route.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-conditional-default-routing.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-67311027832019796002014-01-21T11:23:00.001+00:002014-01-22T08:31:14.542+00:00OSPF Default Route <div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-flooding-reduction.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-summarization-discard-route.html">Next</a></span></span></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
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<span style="font-family: "Trebuchet MS", sans-serif;">Pic. 1 - Topology Diagram.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s1600/ospf.15.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s400/ospf.15.01.png" height="281" width="400" /></a></div>
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<br /></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: "Trebuchet MS",sans-serif;">Remove OSPF configuration applied in the previous lab.</span></div>
<div style="text-align: left;">
<br />
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task 2</b></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">On R1 advertise the loopback0 address (10.0.1.1/32) into OSPF area 0 (currently it is in area 13).</span><br />
<br />
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 3</b></span><br />
<span style="font-family: Trebuchet MS, sans-serif;">On SW2 create summary route 172.16.0.0/16 and 10.0.0.0/16 with the next hop address of 172.16.28.2 (R2).</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 4</b></span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;">SW2 is connected to ISP. </span><span style="font-family: 'Trebuchet MS', sans-serif;">Configure a static default route on R2 with the next hop of 172.16.28.8 and advertise it into OSPF domain. Do not user 'redistribute static' command to accomplish that.</span></div>
</div>
<div style="text-align: left;">
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<span style="font-family: "Trebuchet MS",sans-serif;"><span style="color: #0b5394; font-size: large;">Questions</span></span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">What is the difference between 'default-information originate' and 'default-information originate always'?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Are there any other methods of introducing a default route into OSPF domain?</span></li>
</ol>
<div>
<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOR1RfOG1OWk13TkU/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOR1RfOG1OWk13TkU/edit?usp=sharing</a></span><br />
<br />
<div class="separator" style="clear: both;">
<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: "Trebuchet MS",sans-serif;"><i>Remove OSPF configuration applied in the previous lab.</i></span><br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">interface Serial0/1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> ip ospf flood-reduction</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R5 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">interface Serial0/1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> ip ospf flood-reduction</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<div>
<br /></div>
</div>
<div style="text-align: left;">
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task 2</b></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><i>On R1 advertise the loopback0 address (10.0.1.1/32) into OSPF area 0 (currently it is in area 13).</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R1 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">network 10.0.1.1 0.0.0.0 area 0</span></span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<br />
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - 10.0.1.1 in OSPF Area 0.</span></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisBYl7eOcsIOV8bJEyj2w3piXSuYBs5KTe3vsLpHGgu1bMc8deU6BS-dZoGo0ftlCjeCFX-dlEglzPq260ESP-5JpVj8Evp_CY0vPJvMv8H9Z0HJs1RVqvFnDXhnjdHysDc2PqbboAQAOd/s1600/ospf.21.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisBYl7eOcsIOV8bJEyj2w3piXSuYBs5KTe3vsLpHGgu1bMc8deU6BS-dZoGo0ftlCjeCFX-dlEglzPq260ESP-5JpVj8Evp_CY0vPJvMv8H9Z0HJs1RVqvFnDXhnjdHysDc2PqbboAQAOd/s1600/ospf.21.02.png" height="73" width="400" /></a></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 3</b><br />
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>On SW2 create summary routes 172.16.0.0/16 and 10.0.0.0/16 with the next hop address of 172.16.28.2 (R2).</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">SW2 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="color: blue; font-family: Courier New, Courier, monospace;">ip route 172.16.0.0 255.255.0.0 172.16.28.2</span><br />
<span style="color: blue; font-family: Courier New, Courier, monospace;">ip route 10.0.0.0 255.255.0.0 172.16.28.2</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><b>Task 4</b></span><br />
<span style="color: #0b5394;"><span style="font-family: Trebuchet MS, sans-serif;"><i>SW2 is connected to ISP. </i></span><span style="font-family: 'Trebuchet MS', sans-serif;"><i>Configure a static default route on R2 with the next hop of 172.16.28.8 and advertise it into OSPF domain. Do not use 'redistribute static' command to accomplish that</i>.</span></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">R2 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="color: blue; font-family: Courier New, Courier, monospace;">ip route 0.0.0.0 0.0.0.0 172.16.28.8</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">default-information originate</span></span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
</div>
</div>
<br />
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - Routing Table on R1.</span></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLV5FfbRbHEbBsuuKPXiT0yTglqNmBdJVDn56j0s9bVaP1DXPHtysIml56OrmSjsWG1-Pg_GuGWzZKC0ObV3rJzJZy_mUNGxPewGMrCrN4wY_BzTga92a3vq-kfFjq5kiqkbCsZO34GpzC/s1600/ospf.21.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLV5FfbRbHEbBsuuKPXiT0yTglqNmBdJVDn56j0s9bVaP1DXPHtysIml56OrmSjsWG1-Pg_GuGWzZKC0ObV3rJzJZy_mUNGxPewGMrCrN4wY_BzTga92a3vq-kfFjq5kiqkbCsZO34GpzC/s1600/ospf.21.03.png" height="230" width="400" /></a></div>
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<br />
<span style="font-family: Trebuchet MS, sans-serif;">At this point, SW2 should be able to reach all OSPF enabled subnets and loopbacks.</span><br />
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
</div>
</div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br />OSPF router can introduce default route into the routing domain using a bunch of methods. Static default route can be redistributed into OSPF or advertised into OSPF with 'default-information originate [always]'. The keyword 'always' is only necessary when OSPF router injecting default route does not have it in its routing table. If it is present (static default route), the keyword 'always' is not needed.</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">There are also two other ways of introducing default route into OSPF:</span><br />
<ul>
<li><span style="font-family: Trebuchet MS, sans-serif;">Conditional default route injection</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Reliable default route injection</span></li>
</ul>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">More on these, in later labs.</span></div>
<br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span></div>
</div>
</div>
</div>
<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-flooding-reduction.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-summarization-discard-route.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-32230592685806605502014-01-20T08:40:00.001+00:002014-01-21T11:25:25.968+00:00OSPF Flooding Reduction<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-demand-circuit.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-default-route.html">Next</a></span></span></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-family: "Trebuchet MS", sans-serif;">Pic. 1 - Topology Diagram.</span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s1600/ospf.15.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s400/ospf.15.01.png" height="281" width="400" /></a></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both;">
<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: "Trebuchet MS",sans-serif;">Remove OSPF configuration applied in the previous lab.</span></div>
<div style="text-align: left;">
<br />
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task2</b></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">Point-to-point connection between R4 and R5 is slow. Disable the default LSA flooding triggered every 30 minutes in OSPF area 45.</span></div>
</div>
<div style="text-align: left;">
<br />
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="color: #0b5394; font-size: large;">Questions</span></span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">What does RFC 2328 stipulate regarding the LSA MaxAge?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">What is common way to refer to OSPF flooding behavior?</span></li>
</ol>
<div>
<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOSXFTSFhzMFZyQTg/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOSXFTSFhzMFZyQTg/edit?usp=sharing</a></span><br />
<br />
<br />
<div class="separator" style="clear: both;">
<b style="font-family: 'Trebuchet MS', sans-serif;">Task 1</b></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: "Trebuchet MS",sans-serif;"><i>Remove OSPF configuration applied in the previous lab.</i></span></div>
</div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div class="separator" style="clear: both;">
<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span></div>
<div class="separator" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div class="separator" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;">interface Serial0/1</span></div>
<div class="separator" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> ip ospf demand-circuit</span></div>
<div class="separator" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div class="separator" style="clear: both;">
<br /></div>
<div>
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task2</b></span></div>
<div>
<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Point-to-point connection between R4 and R5 is slow. Disable the default LSA flooding triggered every 30 minutes in OSPF area 45.</i></span></div>
</div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div class="separator" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;">interface Serial0/1</span></div>
<div class="separator" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;"> ip address 172.16.45.4 255.255.255.0</span></div>
<div class="separator" style="clear: both;">
</div>
<div class="separator" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">ip ospf flood-reduction</span></span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">R5 Config:</span></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div class="separator" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;">interface Serial0/1</span></div>
<div class="separator" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;"> ip address 172.16.45.5 255.255.255.0</span></div>
<div class="separator" style="clear: both;">
</div>
<div class="separator" style="clear: both;">
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">ip ospf flood-reduction</span></span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div class="separator" style="clear: both; text-align: left;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - OSPF Database on R5.</span></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidQKBxQ9cOYwBfAH0ElOfkmiyESLZ_Ds1IY1uNcpnRoOsUZ4d8BGWY05UrvEQmunD2jMJcQKg6A_q4EH8jl8t6aQjRpyVZYQzUSX3Q8nwuAIjZ3kyWzn6ga1QqOZi6a3hYPIWtLBJ2J0sd/s1600/ospf.20.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidQKBxQ9cOYwBfAH0ElOfkmiyESLZ_Ds1IY1uNcpnRoOsUZ4d8BGWY05UrvEQmunD2jMJcQKg6A_q4EH8jl8t6aQjRpyVZYQzUSX3Q8nwuAIjZ3kyWzn6ga1QqOZi6a3hYPIWtLBJ2J0sd/s1600/ospf.20.01.png" height="340" width="400" /></a></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: left;">
<br /></div>
<div class="separator" style="clear: both;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
</div>
</div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br />RFC 2328 (OSPF version2) defines the maximum age of LSA (MaxAge). The timer is set to 30 minutes by default after which LSAs time will not be incremented. An OSPF router mus re-flood this LSA as it is a new LSA. This behavior is called 'paranoid' update. This can be disabled using DoNotAge flag in OSPF update.</span><br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span></div>
</div>
</div>
</div>
<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-demand-circuit.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-default-route.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-79536909235167282014-01-17T09:05:00.000+00:002014-01-20T08:42:24.568+00:00OSPF Demand Circuit<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-lsa-flood-filtering.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-flooding-reduction.html">Next</a></span></span></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-family: "Trebuchet MS", sans-serif;">Pic. 1 - Topology Diagram.</span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s1600/ospf.15.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s400/ospf.15.01.png" height="281" width="400" /></a></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both;">
<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: "Trebuchet MS",sans-serif;">Remove OSPF filtering applied in the previous lab.</span></div>
<div style="text-align: left;">
<br />
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task2</b></span></div>
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;">Since the point-to-point connection between R4 and R5 is slow, prevernt OSPF on this link from sending LSA refresh advertisements. Routers should not even use hello packets on this point-to-point link.</span></div>
</div>
<div style="text-align: left;">
<br />
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="color: #0b5394; font-size: large;">Questions</span></span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">What is the LSA refresh time used by Cisco?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Which types of connection the solution is particularly useful on?</span></li>
</ol>
<div>
<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOWWNNVlVKZmp6Y0k/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOWWNNVlVKZmp6Y0k/edit?usp=sharing</a></span><br />
<br />
<div class="separator" style="clear: both;">
<br /></div>
<div class="separator" style="clear: both;">
<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: "Trebuchet MS",sans-serif;"><i>Remove OSPF filtering applied in the previous lab.</i></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface Serial0/1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 172.16.45.4 255.255.255.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> ip ospf database-filter all out</span></div>
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<span style="font-family: 'Courier New', Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R5 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip route 0.0.0.0 0.0.0.0 s0/1</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task2</b></span></div>
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<span style="color: #0b5394; font-family: Trebuchet MS, sans-serif;"><i>Since the point-to-point connection between R4 and R5 is slow, prevernt OSPF on this link from sending LSA refresh advertisements. Routers should not even use hello packets on this point-to-point link.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<br />
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2- OSPF Interface Information without Demand Circuit Feature.</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhm_7n4p8NTsVFX-92nrGxIUUvTj5raAUI3mbu-XYLpYowFDhsvWO9E7dIsBpIZPH5oHSmqdtb0F4BrdphulUlxwkVzKETH0ObidfY481VLvfvAXdDKmSphCCqRT_JnMUFeBMCydlln6T2q/s1600/ospf.19.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhm_7n4p8NTsVFX-92nrGxIUUvTj5raAUI3mbu-XYLpYowFDhsvWO9E7dIsBpIZPH5oHSmqdtb0F4BrdphulUlxwkVzKETH0ObidfY481VLvfvAXdDKmSphCCqRT_JnMUFeBMCydlln6T2q/s1600/ospf.19.02.png" height="190" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<span style="font-family: 'Trebuchet MS', sans-serif;">R4 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">interface Serial0/1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> ip address 172.16.45.4 255.255.255.0</span><br />
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">ip ospf demand-circuit</span></span><br />
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - OSPF Interface Information with Demand Circuit Feature.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFHgVW-zgb8Fqr6uEDZazDG_FN5CdPByX6WkmFat_rUqmln_5OxetvN8_f2AVhIoVsLjeQdSTQ0vk8OKa6NvgR3jG7HTwNrrLI76XQeUV4dK-6SeegkMA0ZiUibdPemWErs020JV8g06VT/s1600/ospf.19.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFHgVW-zgb8Fqr6uEDZazDG_FN5CdPByX6WkmFat_rUqmln_5OxetvN8_f2AVhIoVsLjeQdSTQ0vk8OKa6NvgR3jG7HTwNrrLI76XQeUV4dK-6SeegkMA0ZiUibdPemWErs020JV8g06VT/s1600/ospf.19.03.png" height="174" width="320" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 4 - R4-R5 Neighbor Dead Timer.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgGg5vHyIGaE5qYtmvjqkNQJ0uLQfsumttqFcnHqJYvyRxSn7M2escx23NiwGsyYFMoqtfws_rnxv4JRfg41FbB8TaU2OFka-hgnhuujTYA7hjtPbvgwE8vFtMNN7ARxIowDpTTkIVVif-u/s1600/ospf.19.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgGg5vHyIGaE5qYtmvjqkNQJ0uLQfsumttqFcnHqJYvyRxSn7M2escx23NiwGsyYFMoqtfws_rnxv4JRfg41FbB8TaU2OFka-hgnhuujTYA7hjtPbvgwE8vFtMNN7ARxIowDpTTkIVVif-u/s1600/ospf.19.04.png" height="64" width="320" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">RFC 2328 stipulates that the self originated LSAs must be refreshed using LSRefreshTime (every 30 minutes):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;"><i>LSRefreshTime</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><i> The maximum time between distinct originations of any particular</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><i> LSA. If the LS age field of one of the router's self-originated</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><i> LSAs reaches the value LSRefreshTime, a new instance of the LSA</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><i> is originated, even though the contents of the LSA (apart from</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><i> the LSA header) will be the same. The value of LSRefreshTime is</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><i> set to 30 minutes.</i></span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">However, RFC 1793, describes OSPF operation to support Demand Circuits (Dial-up, ISDN etc.). Hellos and LSA refresh mechanisms are being suppressed on those types of OSPF connections. This feature will be negotiated between OSPF routers.</span><br />
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<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span></div>
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<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2014/01/ospf-lsa-flood-filtering.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-flooding-reduction.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-65307992604278594782014-01-15T21:08:00.000+00:002014-01-21T09:36:15.446+00:00OSPF LSA Database Filtering<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2013/09/ospf-inter-area-filtering-using-area_19.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-demand-circuit.html">Next</a></span></span></span></div>
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<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
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<span style="font-family: "Trebuchet MS", sans-serif;">Pic. 1 - Topology Diagram.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s1600/ospf.15.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s400/ospf.15.01.png" height="281" width="400" /></a></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: "Trebuchet MS",sans-serif;">Remove OSPF filtering applied in the previous lab.</span></div>
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<br />
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task2</b></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Configure R4 such that it learns prefixes advertised by R5 via OSPF (Lo0: 10.0.5.5/32), but R5 does not learn any OSPF prefixes from R4. OSPF state between R4 and R5 should be 'full'. R5 should use a static default route in order to get connectivity to the rest of OSPF domain. </span><span style="font-family: 'Trebuchet MS', sans-serif;">Do not use any filtering mechanism to accomplish that (such as ACL, route-map etc.).</span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><span style="color: #0b5394; font-size: large;">Questions</span></span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: Trebuchet MS, sans-serif;">Can you enumerate OSPF intra-area and inter-area filtering mechanisms?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Apart from reducing the size of the routing table, what other goal can you accomplish with prefix filtering?</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">What are two ways of using LSA Flood Filtering?</span></li>
</ol>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration can be accessed below (if you want to save it, click the link, then go to File-->Download):</span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><a href="https://drive.google.com/file/d/0BwE5C95tpjZOM3RQRVVjakNKUjA/edit?usp=sharing">https://drive.google.com/file/d/0BwE5C95tpjZOM3RQRVVjakNKUjA/edit?usp=sharing</a></span><span style="font-family: "Trebuchet MS",sans-serif;"> </span><br />
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<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: "Trebuchet MS",sans-serif;"><i>Remove OSPF filtering applied in the previous lab.</i></span><br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span>
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<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip prefix-list BLOCK deny 172.16.13.0/24</span></div>
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<span style="font-family: Courier New, Courier, monospace;"><span style="color: red;">no</span> ip prefix-list BLOCK permit 0.0.0.0/0 le 32 </span></div>
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<span style="font-family: Courier New, Courier, monospace;">! </span></div>
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<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">no</span> area 0 filter-list prefix BLOCK out</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task2</b></span></div>
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<i><span style="color: #0b5394;"><span style="font-family: Trebuchet MS, sans-serif;">Configure R4 such that it learns prefixes advertised by R5 via OSPF (Lo0: 10.0.5.5/32), but R5 does not learn any OSPF prefixes from R4. OSPF state between R4 and R5 should be 'full'. R5 should use a static default route in order to get connectivity to the rest of OSPF domain. </span><span style="font-family: 'Trebuchet MS', sans-serif;">Do not use any filtering mechanism to accomplish that (such as ACL, route-map etc.).</span></span></i><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">R5 current OSPF configuration:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> log-adjacency-changes</span><br />
<span style="font-family: Courier New, Courier, monospace;"> network 10.0.5.5 0.0.0.0 area 45</span><br />
<br />
<span style="font-family: Courier New, Courier, monospace;"> network 172.16.45.0 0.0.0.255 area 45</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: "Trebuchet MS",sans-serif;"><b><br /></b></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - R5's OSPF Routing Table Before Filtering.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4DUbzyMtEdMxvM9PFZhM1QfsbbliZk71pPEUiuoqelP95out1TaF58ndA5Aj0ZyDYBiwdnKDPVBv0uDs9DxigL8Fdv1uf2l_kT_6QV6nqeQAY3NOOHf9M8jdcVKnHXkQb941e4F15VSWP/s1600/ospf.18.02.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4DUbzyMtEdMxvM9PFZhM1QfsbbliZk71pPEUiuoqelP95out1TaF58ndA5Aj0ZyDYBiwdnKDPVBv0uDs9DxigL8Fdv1uf2l_kT_6QV6nqeQAY3NOOHf9M8jdcVKnHXkQb941e4F15VSWP/s400/ospf.18.02.png" height="167" width="400" /></a></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R4 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">interface Serial0/1</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> ip address 172.16.45.4 255.255.255.0</span></div>
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<span style="font-family: Courier New, Courier, monospace;"> <span style="color: blue;">ip ospf database-filter all out</span></span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">R5 Config:</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Courier New, Courier, monospace;">ip route 0.0.0.0 0.0.0.0 s0/1</span></div>
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<span style="font-family: Courier New, Courier, monospace;">!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">NOTICE!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Clear IP OSPF process on R5 for this change to take effect!</span></div>
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<span style="font-family: Trebuchet MS, sans-serif;">Pic. 3 - R5 After Applying Solution.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFDx_6ddjNq33EIv8E5VBP3Vu-4GnByN0PTgSGf0Y-KrJnddAGmeuiN7tx9-JHtyJy-Y55669uJ7kTe-tphRTKZEJFuk4o3L834yhdIZv3JqVmGew39mvH6f8BufCjqbjSzmLfqAa-Z-6X/s1600/ospf.18.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFDx_6ddjNq33EIv8E5VBP3Vu-4GnByN0PTgSGf0Y-KrJnddAGmeuiN7tx9-JHtyJy-Y55669uJ7kTe-tphRTKZEJFuk4o3L834yhdIZv3JqVmGew39mvH6f8BufCjqbjSzmLfqAa-Z-6X/s400/ospf.18.03.png" height="241" width="400" /></a></div>
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<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
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</div>
<div>
<br />
<span style="font-family: Trebuchet MS, sans-serif;">Filtering in OSPF can be applied as INTRA-AREA and INTER-AREA filtering mechanism. </span><br />
<span style="font-family: Trebuchet MS, sans-serif;">INTRA-AREA filtering cannot filter LSAs but can filter prefixes sent from LSDB into a routing table. </span><br />
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span>
<span style="font-family: Trebuchet MS, sans-serif;">INTRA-AREA (LSA1/2) Filtering Methods:</span><br />
<br />
<ul>
<li><span style="font-family: Trebuchet MS, sans-serif;">distribute-list (with ACL, or route-map referring to ACL or prefix-list).</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">Changing Administrative Distance to 255 (Unknown) on chosen prefixes.</span></li>
</ul>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">INTER-AREA (LSA3) Filtering Methods (on ABR):</span></div>
<div>
<ul>
<li><span style="font-family: Trebuchet MS, sans-serif;">area <i>number</i> range <i>pfx</i> not-advertise.</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">area <i>number</i> prefix-list <i>name</i> in|out.</span></li>
<li><span style="font-family: Trebuchet MS, sans-serif;">ip ospf database-filter all out command (LSA flood filtering)</span></li>
</ul>
<div>
<span style="color: red; font-family: Trebuchet MS, sans-serif;"><b>Notice!</b></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">In OSPF point-to-multipoint mode, LSA Flood Filtering can be applied with the following command:</span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;"> <span style="color: red;">neighbor address database-filter all out</span></span></div>
<div>
<span style="font-family: Courier New, Courier, monospace;">!</span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif;">We must not forget that LSA and/or prefix filtering can help us influence the path selection (traffic engineering). </span></div>
</div>
<br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span></div>
</div>
</div>
</div>
<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2013/09/ospf-inter-area-filtering-using-area_19.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-demand-circuit.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-11330131829699689592014-01-14T10:12:00.000+00:002014-01-14T10:27:43.692+00:00Intense SchoolBelow are articles I have written for <a href="http://resources.intenseschool.com/author/jarek-rek/">INTENSE SCHOOL</a>. Synopsis of the articles can be found below:<br />
<br />
1. IOS Speed Tips Part 1<br />
2. IOS Speed Tips Part 2<br />
3. IOS Speed Tips Part 3<br />
4. IOS Speed Tips Part 4<br />
5. IOS Speed Tips Part 5 (in preparation)<br />
6. IP Addressing and Masks: Theory<br />
7. IP Subnetting Practice (Exam Preparation)<br />
<br />
<br />
<span style="font-size: x-small;">1. <a href="http://resources.intenseschool.com/ios-cli-speed-tips/">IOS Speed Tips Part 1</a></span><br />
<span style="font-size: x-small;">In this article you will find the following tips:</span><br />
<br />
<span style="font-size: x-small;"><b>Tip #1:</b></span><br />
<span style="font-size: x-small;">Increase the size of the command history buffer.</span><br />
<br />
<span style="font-size: x-small;"><b>Tip #2:</b></span><br />
<span style="font-size: x-small;">Use CLI editing features and common shortcuts.</span><br />
<br />
<span style="font-size: x-small;"><b>Tip #3:</b></span><br />
<span style="font-size: x-small;">Use the ‘do’ keyword in any context in combination with the ‘show’ and ‘debug’ commands in any IOS context (‘config’, ‘interface’, ‘router’, etc.).</span><br />
<br />
<span style="font-size: x-small;"><b>Tip #4:</b></span><br />
<span style="font-size: x-small;">Use pipe ‘|’ with available arguments to display and/or redirect only required sections of your configuration and/or ‘show’ command output.</span><br />
<br />
<span style="font-size: x-small;"><b>Tip #5:</b></span><br />
<span style="font-size: x-small;">Use TCL script for ping connectivity test if multiple destination IP addresses are involved. </span><br />
<br />
<span style="font-size: x-small;"><a href="http://resources.intenseschool.com/ios-cli-speed-tips/">Read more...</a></span><br />
<span style="font-size: x-small;"><br /></span>
<span style="font-size: x-small;">2. <a href="http://resources.intenseschool.com/more-ios-cli-speed-tips/">IOS Speed Tips Part 2</a></span><br />
<span style="font-size: x-small;">This article features: </span><br />
<br />
<b><span style="font-size: x-small;">Tip #6:</span></b><br />
<span style="font-size: x-small;">Disabling domain lookup.<br /> </span><br />
<b><span style="font-size: x-small;">Tip #7:</span></b><br />
<span style="font-size: x-small;">Preventing syslog messages from interrupting your typing.<br /> </span><br />
<b><span style="font-size: x-small;">Tip #8:</span></b><br />
<span style="font-size: x-small;">Faster way of saving your configuration in NVRAM.<br /> </span><br />
<b><span style="font-size: x-small;">Tip #9:</span></b><br />
<span style="font-size: x-small;">Creating command aliases.<br /> </span><br />
<span style="font-size: x-small;"><b>Tip #10: </b></span><br />
<span style="font-size: x-small;">Using ‘debugs’ the way experts do. </span><br />
<span style="font-size: x-small;"><br /></span>
<span style="font-size: x-small;"><a href="http://resources.intenseschool.com/more-ios-cli-speed-tips/">Read more...</a></span><br />
<br />
<span style="font-size: x-small;">3. <a href="http://resources.intenseschool.com/ios-speed-tips-part-3/">IOS Speed Tips Part 3</a></span><br />
<span style="font-size: x-small;">In this article you can learn: </span><br />
<br />
<span style="font-size: x-small;">Tip #11: </span><br />
<span style="font-size: x-small;">Copy IOS using TFTP and FTP (recommended) servers.<br /> </span><br />
<span style="font-size: x-small;">Tip #12: </span><br />
<span style="font-size: x-small;">Copy configuration using terminal software logging capability.<br /> </span><br />
<span style="font-size: x-small;">Tip # 13: </span><br />
<span style="font-size: x-small;">Copy configuration to and from a TFTP/FTP/RCP server.<br /> </span><br />
<span style="font-size: x-small;">Tip #14: </span><br />
<span style="font-size: x-small;">Flash memory configuration archive.<br /> </span><br />
<span style="font-size: x-small;">Tip #15: </span><br />
<span style="font-size: x-small;">Seamless running-configuration replacement. </span><br />
<span style="font-size: x-small;"><br /></span>
<a href="http://resources.intenseschool.com/ios-speed-tips-part-3/"><span style="font-size: x-small;">Read more...</span></a><br />
<br />
<br />
<span style="font-size: x-small;">4. <a href="http://resources.intenseschool.com/ios-speed-tips-part-4-16-20/">IOS Speed Tips Part 4 </a></span><br />
<span style="font-size: x-small;">The article briefly explains the following:</span><br />
<span style="font-size: x-small;"><br /></span>
<span style="font-size: x-small;">Tip #16:</span><br />
<span style="font-size: x-small;">Cisco Switch Interface “Range” Command.<br /> </span><br />
<span style="font-size: x-small;">Tip #17: </span><br />
<span style="font-size: x-small;">User Privilege Levels.<br /> </span><br />
<span style="font-size: x-small;">Tip #18: </span><br />
<span style="font-size: x-small;">Switch Macro Command.<br /> </span><br />
<span style="font-size: x-small;">Tip #19: </span><br />
<span style="font-size: x-small;">Named ACL.<br /> </span><br />
<span style="font-size: x-small;">Tip #20: </span><br />
<span style="font-size: x-small;">‘Reload in’ Command.</span><br />
<br />
<a href="http://Cisco Switch Interface “Range” Command User Privilege Levels Switch Macro Command Named ACL ‘Reload in’ Command"><span style="font-size: x-small;">Read more..</span>.</a><br />
<br />
<span style="font-size: x-small;">5. IOS Speed Tips Part 5 (in preparation)</span><br />
<span style="font-size: x-small;"><br /></span>
<span style="font-size: x-small;">6. <a href="http://resources.intenseschool.com/ccna-converting-between-binary-and-decimal-for-network-masks/">IP Addressing and Masks: Theory</a></span><br />
<span style="font-size: x-small;">In this article I am dissecting IP addresses, network masks and subnet theory.</span><br />
<br />
<span style="font-size: x-small;"><a href="http://resources.intenseschool.com/ccna-converting-between-binary-and-decimal-for-network-masks/">Read more...</a> </span><br />
<span style="font-size: x-small;"><br /></span>
<span style="font-size: x-small;">7. <a href="http://resources.intenseschool.com/subnetting-solution/">IP Subnetting Practice (Exam Preparation)</a></span><br />
<span style="font-size: x-small;">In this article you will find different mock exam questions regarding subnetting calculation along with the solutions.</span><br />
<span style="font-size: x-small;"><br /></span>
<span style="font-size: x-small;"><a href="http://resources.intenseschool.com/subnetting-solution/">Read more...</a></span><br />
<span style="font-size: x-small;"><br /></span>
<span style="font-size: x-small;"> </span><br />
<br />Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.comtag:blogger.com,1999:blog-8114181429363086747.post-15934992128757059472013-09-19T14:19:00.000+01:002014-01-17T08:30:27.898+00:00OSPF Inter-Area Filtering using Area Filter-List<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-size: large;"><span style="font-family: "Trebuchet MS", sans-serif;"><a href="http://hackingcisco.blogspot.ie/2013/09/ospf-inter-area-filtering-using-area.html">Previous</a> | </span><a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html"><span style="font-family: "Trebuchet MS", sans-serif;">Intermediate Level</span></a><span style="font-family: "Trebuchet MS", sans-serif;"> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-lsa-flood-filtering.html">Next</a></span></span></span></div>
<div>
<span style="font-family: Trebuchet MS, sans-serif; font-size: large;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-family: "Trebuchet MS", sans-serif;">Pic. 1 - Topology Diagram.</span></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s1600/ospf.15.01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHisCq7WfVrOO3mjuB8M3ZuD_xEMMYBjkbceRlnrJ89NtCSYnKewFTYksYCjtmuT4yXLBQwtVx-a28aa8Cl8e-SAMQgH06DAQe6QGB7TMmyevQ29Zn1RwayEGMcWUabiURkKF8E_0BIKHJ/s400/ospf.15.01.png" height="281" width="400" /></a></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div style="text-align: center;">
<div style="text-align: left;">
<span style="font-family: "Trebuchet MS",sans-serif;">Remove OSPF filtering applied in the previous lab.</span></div>
<div style="text-align: left;">
<br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task2</b></span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;">Ensure that R5 learns all OSPF prefixes except for 172.16.12.0/24. Use area filter-list command to accomplish that.</span><br />
<br />
<span style="font-family: "Trebuchet MS",sans-serif;"><span style="color: #0b5394; font-size: large;">Questions</span></span></div>
</div>
<span style="font-family: "Trebuchet MS",sans-serif;">Try to answer the following questions:</span><br />
<ol>
<li><span style="font-family: "Trebuchet MS",sans-serif;">What is the difference in operation between <span style="font-family: "Courier New",Courier,monospace;">'area <i>number</i> range'</span>, and </span><span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-family: "Trebuchet MS",sans-serif;"><span style="font-family: "Courier New",Courier,monospace;">'area <i>number</i> filter-list prefix' </span></span>command?</span></li>
<li><span style="font-family: "Trebuchet MS",sans-serif;">What type of OSPF router do both of these command work on?</span></li>
<li><span style="font-family: "Trebuchet MS",sans-serif;">Do they filter LSAs or just a prefix? </span></li>
</ol>
<div>
<div style="text-align: center;">
<div style="text-align: left;">
<div style="text-align: center;">
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: x-large;">Lab Solution</span></div>
<div style="text-align: left;">
<span style="font-family: Trebuchet MS, sans-serif;"><br /></span><span style="font-family: Trebuchet MS, sans-serif;">Solution configuration below:</span><span style="font-family: "Trebuchet MS",sans-serif;"><b> </b></span><br />
<div class="separator" style="clear: both;">
<a href="https://docs.google.com/file/d/0BwE5C95tpjZOQ1gwU1NVaE5wY28/edit?usp=sharing"><span style="font-family: "Trebuchet MS",sans-serif;">https://docs.google.com/file/d/0BwE5C95tpjZOQ1gwU1NVaE5wY28/edit?usp=sharing</span></a></div>
<div class="separator" style="clear: both;">
<span style="font-family: "Trebuchet MS",sans-serif;"><b><br /></b></span></div>
<div class="separator" style="clear: both;">
<span style="font-family: "Trebuchet MS",sans-serif;"><b>Task 1</b></span></div>
<div>
<span style="color: #0b5394; font-family: "Trebuchet MS",sans-serif;"><i>Remove OSPF filtering applied in the previous lab.</i></span><br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span><span style="font-family: "Trebuchet MS",sans-serif;">R4 Config:</span><br />
<span style="font-family: "Courier New",Courier,monospace;">!</span></div>
<div>
<span style="font-family: "Courier New",Courier,monospace;">router ospf 1</span></div>
<div>
<span style="font-family: "Courier New",Courier,monospace;"> no area 0 range 172.16.12.0 255.255.255.0 not-advertise</span></div>
<div>
<span style="font-family: "Courier New",Courier,monospace;">!</span><br />
<div>
<br /></div>
<span style="font-family: 'Trebuchet MS', sans-serif;"><b>Task2</b></span><br />
<span style="color: #0b5394;"><i><span style="font-family: Trebuchet MS, sans-serif;">Ensure that R5 learns all OSPF prefixes except for 172.16.12.0/24. Use area filter-list command to accomplish that.</span></i></span><br />
<div>
<span style="font-family: 'Trebuchet MS', sans-serif;"></span>
<br />
<div style="text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><span style="font-family: Trebuchet MS, sans-serif;">Pic. 2 - R5 Status Before Filter-List.</span></span></div>
<div style="text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<span style="font-family: Trebuchet MS, sans-serif;"><span style="font-family: Trebuchet MS, sans-serif;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhW12RMGBErE0e21PzATkMdfdNNfMOhhw7IcxLa9ayHhMuXIx3FuGYymMzzo-qhcoXuDUZmQDo9W6bViuMvK00WcVHACDQX4sI63CMRmEtWMtkn3d1mCCI0rwpqRal1TtYYT9WBnHwgl1Qb/s1600/ospf.16.03.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhW12RMGBErE0e21PzATkMdfdNNfMOhhw7IcxLa9ayHhMuXIx3FuGYymMzzo-qhcoXuDUZmQDo9W6bViuMvK00WcVHACDQX4sI63CMRmEtWMtkn3d1mCCI0rwpqRal1TtYYT9WBnHwgl1Qb/s400/ospf.16.03.png" height="181" width="400" /></a></span></span></div>
<span style="font-family: Trebuchet MS, sans-serif;"> </span><br />
<span style="font-family: Trebuchet MS, sans-serif;"> R4 Config:</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: Courier New, Courier, monospace;">ip prefix-list BLOCK deny 172.16.13.0/24<br />ip prefix-list BLOCK permit 0.0.0.0/0 le 32 </span><br />
<span style="font-family: Courier New, Courier, monospace;">! </span><br />
<span style="font-family: Courier New, Courier, monospace;">router ospf 1</span><br />
<span style="font-family: Courier New, Courier, monospace;"> area 0 filter-list prefix BLOCK out</span><br />
<span style="font-family: Courier New, Courier, monospace;">!</span><br />
<span style="font-family: 'Trebuchet MS', sans-serif;"><br /></span>
<span style="font-family: 'Trebuchet MS', sans-serif;">Verification:</span><br />
<div style="text-align: center;">
<span style="font-family: 'Trebuchet MS', sans-serif;">Pic. 3 - R5 LSDB and Routing Table.</span><br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhAevtXawf2TNG3rRYoNdiRjPac83xLxBD5RcwNhcayaKoM518J4zeOUxyoCgCfELNpYZOOyKMerRYXZlBRBgta5Wvo2AVrD_s70vOMkGqEvUxBREw0qpRwpIwvjVEHzrDCo81YrCYb9R5Q/s1600/ospf.16.04.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhAevtXawf2TNG3rRYoNdiRjPac83xLxBD5RcwNhcayaKoM518J4zeOUxyoCgCfELNpYZOOyKMerRYXZlBRBgta5Wvo2AVrD_s70vOMkGqEvUxBREw0qpRwpIwvjVEHzrDCo81YrCYb9R5Q/s320/ospf.16.04.png" height="84" width="320" /></a></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<br /></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="color: red;"><b><span style="font-family: "Trebuchet MS",sans-serif;">NOTICE!</span></b></span></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: "Trebuchet MS",sans-serif;">LSDB entry will be removed after few seconds (wait at least 30-40 seconds for this to take effect)! </span></div>
<div class="separator" style="clear: both; text-align: left;">
<br /></div>
<div class="separator" style="clear: both; text-align: left;">
<span style="font-family: "Trebuchet MS",sans-serif;">The conclusion is that both commands ('<span style="font-family: "Courier New",Courier,monospace;">area range</span>' and '<span style="font-family: "Courier New",Courier,monospace;">area filter-list</span>'), prevent ABR from sending LSAs into the area(s) as well. In this instance, R4 has filtered out LSA from the area for which it is not ABR (R4 is not directly connected to area 13).</span></div>
<span style="font-family: "Trebuchet MS",sans-serif;"> <span style="color: #0b5394; font-size: large;"> </span></span><br />
<div style="text-align: left;">
<span style="color: #0b5394; font-family: 'Trebuchet MS', sans-serif; font-size: large;">Study Drill</span></div>
</div>
</div>
</div>
</div>
</div>
<div>
<br />
<span style="font-family: Trebuchet MS, sans-serif;">If you have not tried my suggestion in the previous lab, try to use the same prefix (172.16.13.0) to filter it using '<span style="font-family: "Courier New",Courier,monospace;">area <i>number</i> range</span>' command. Filtering will not work.</span><br />
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span>
<span style="font-family: "Trebuchet MS",sans-serif;"><br /></span></div>
</div>
</div>
</div>
<div style="text-align: center;">
<span style="color: #0b5394;"><span style="font-family: "Trebuchet MS", sans-serif; font-size: large;"><a href="http://hackingcisco.blogspot.ie/2013/09/ospf-inter-area-filtering-using-area.html">Previous</a> | <a href="http://hackingcisco.blogspot.ie/2012/09/wanna-be-geek.html">Intermediate Level</a> | <a href="http://hackingcisco.blogspot.ie/2014/01/ospf-lsa-flood-filtering.html">Next</a></span></span></div>
Jhttp://www.blogger.com/profile/14613178990982384153noreply@blogger.com