Monday, March 14, 2011

Lab 40 - EIGRP Manual Summarization

Prerequisites: CCNP level skills.
Topology
Pic. 1 - EIGRP NBMA Topology.
Icons designed by: Andrzej Szoblik - http://www.newo.pl

Task 1
Given the topology (pic. 1) enable EIGRP (AS 1) protocol on all interfaces. You should use one network statement on each router.

Task 2
On R3 check the routing table.

Task 3
Configure route summarization on R2 so that both loopback 1 and loopback 2 addresses are represented by a single EIGRP entry in the routing table. The summary route should not overlap any address space.

Task 4
Repeat the task 3 on R1. Check routing table on R3. It should see the two summary routes.

Lab Solution

Task 1
Given the topology (pic. 1) enable EIGRP (AS 1) protocol on all interfaces. You should use one network statement on each router.

R1, R2, R3 Configuration:
!
router eigrp 1
 network 0.0.0.0
 no auto-summary
!
Notice!
Automatic summarization has been disabled ('no auto-summary') as per task 3 and task 4 requirement.



Task 2
On R3 check routing table.

Pic. 2 - EIGRP Routing Table on R3.
Task 3
Configure route summarization on R2 so that both loopback 1 and loopback 2 addresses are represented by a single EIGRP entry in the routing table. The summary route should not overlap any address space.

R2 Configuration:
!
interface FastEthernet1/0
 ip address 10.1.12.2 255.255.255.0
 ip summary-address eigrp 1 192.168.2.0 255.255.254.0 5
!

Notice!
The summary command automatically adds (can be changed manually) Administrative Distance 5. Any route with AD between 1-4 can override it.

Pic. 3 - R2's Routing Table.
Notice!
The 'discard route' has been automatically added to R2's routing table (null0).

Pic. 4 - The Discard Route Administrative Distance: 5.

Pic. 5 - R3's Routing Table.

Task 4
Repeat the task 3 on R1. Check routing table on R3. It should see the two summary routes.

R1 Configuration:
!
interface Serial0/1
 ip address 10.1.13.1 255.255.255.0
 ip summary-address eigrp 1 192.168.0.0 255.255.254.0 5
!

Pic. 6 - R3's Routing Table.