Wednesday, February 2, 2011

Lab 1 - OSPF Point-to-Point Mode

Prerequisites: CCNP skills.

Here's our first lab which I hope is going to help us hone the skills with OSPF point-to-point operation.

First, a quick refresher.

Cisco IOS OSPF modes of Operation:
  1. Point-to-point (Cisco)
  2. Broadcast (Cisco)
  3. Non-broadcast (RFC 2328)
  4. Point-to-multipoint (RFC 2328)
  5. Point-to-multipoint non-broadcast  (Cisco)
It's time to roll up the sleeves. Below is my topology.
    Topology

    Pic. 1 - OSPF Point-to-Point Topology.
    Icons designed by: Andrzej Szoblik - http://www.newo.pl

    Workflow
    1. Read the whole task list first and try to picture what needs to be done.
    2. Answer the questions listed below BEFORE you start the lab.
    3. Check the results with your answers given before starting the lab (the answers will available in the next post).
    Task List
    On router R1:
    • Use default encapsulation on serial0/1 interface.
    • Enable and configure interfaces as per topology diagram (pic. 1).
    • Enable OSPF area 0 on F1/0 interface. Make sure that no other interface is going to be enabled if one is created in the future.
    • Enable OSPF area 0 on S0/1 interface. Use the wildcard mask as per original network mask.
    • Make sure that both interfaces are OSPF-enabled.
    On router R3:
    • Use default encapsulation on serial0/1 interface.
    • Enable and configure interfaces as per topology diagram (pic. 1).
    • Enable OSPF area 0 on F1/0 interface. Make sure that no other interface is going to be enabled if one is created in the future.
    • Enable OSPF area 0 on S0/1 interface. Use the wildcard mask as per original network mask.
    • Make sure that both interfaces are OSPF-enabled.
    On router R1 and R3:
    • Check if the OSPF adjacency has been built.
    • Check if the the advertised routes are in LSDBs.
    • Check the OSPF routing table.
    • Check the reachability between the two subnets being advertised.
    Questions
    1. What is the default OSPF mode of operation on F1/0 interface?
    2. Are hello packets sent using unicast or multicast?
    3. Does F1/0 interface participate in DR/BDR election? Why?
    4. What is the default OSPF mode of operation on S0/1 interface?
    5. Are hello packets sent using unicast or multicast? 
    6. Does it participate in DR/BDR election? Why?
    7. What are the default hello and dead interval timers used on F1/0 and S0/1?
    8. Is there any other OSPF mode of operation that could work with the default OSPF mode on F1/0? What would you have to do to make it work?
    9. Is there any other OSPF mode of operation that could work with the default OSPF mode on S1/0? What would you have to do to make it work?
    10. Without using the 'network' statement, how can you advertise the subnet 10.1.1.0/24?
    Video on Youtube with the answers to the questions:
    http://www.youtube.com/watch?v=tVBxlSUj77g
      Video with the lab and practical presentation for questions 8-10.
      http://www.youtube.com/watch?v=cQMgnX7J68E


      In the next post, I'm going to post the solution to the lab along with the answers to the questions above.
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