Task:
Configure EIGRP 100 and make sure all the routers are able to form neighbor relationship and learn the best route using EIGRP.
Verify the neighbor table, routing table and topology table.

R1#configure terminal
R1(config)#router eigrp 100
R1(config-router)#network 192.168.1.0
R1(config-router)#network 1.0.0.0
R1(config-router)#network 4.0.0.0
R1(config-router)#no auto-summary
R1(config-router)#end

– The above output displays that the router is running EIGRP with Automomous system number 100.
– It uses K1(Bandwidth)& K3(Delay) to calculate the metric. EIGRP internal routes will be marked as “D” and will be installed
in the routing table with an Administrative Distance value of 90 & EIGRP External routes will be marked as “D EX” with an AD of 170.
– EIGRP can perform equal & unequal cost load balancing across 4 paths.
– Currently the output shows that the router is configured with a default maximum hop count of 100 but it can support upto a maximum of 255 hops.
– The router is advertising the directly connected networks.

*********************************************************************************************************************
R2#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#router eigrp 100
R2(config-router)#network 1.0.0.0
*Jul 31 20:25:10.152: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 1.0.0.1 (GigabitEthernet0/1) is up: new adjacency
R2(config-router)#network 2.0.0.0
R2(config-router)#network 192.168.2.0
R2(config-router)#no auto-summary
R2(config-router)#end

************************************************************************************************************************

R3#configure terminal
R3(config)#router eigrp 100
R3(config-router)#network 192.168.3.0
R3(config-router)#network 2.0.0.0
R3(config-router)#network 2.0.0.0
*Jul 31 21:32:43.571: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 2.0.0.1 (GigabitEthernet0/0) is up: new adjacency
R3(config-router)#network 3.0.0.0
R3(config-router)#no auto-summary
R3(config-router)#end

***********************************************************************************************************************

R4#config t
R4(config)#router eigrp 100
R4(config-router)#network 3.0.0.0
*Jul 31 21:35:25.697: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 3.0.0.1 (GigabitEthernet0/1) is up: new adjacency
R4(config-router)#network 4.0.0.0
*Jul 31 21:35:30.751: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 4.0.0.1 (GigabitEthernet0/0) is up: new adjacency
R4(config-router)#network 192.168.4.0
R4(config-router)#no auto-summary
R4(config-router)#end

*********************************************************************************************************************

Verify the neighbor table and you will find the routers forming a neighbor relationship with the other directly connected routers through EIGRP

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Verify the EIGRP Routing Table and you will find the routes marked as “D”  The routes marked with a code D will be the routes learned through EIGRP

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Verify the EIGRP topology table. You will find the successor (Best Path) and feasible successor (Second Best Path) in the topology table.
All the statements in the topology table should be marked with Code “P” which means that all the routes learned through EIGRP are reachable.

 

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