Cisco IOS Cookbook, 2nd Edition

Configuring EIGRP

Problem

You want to run EIGRP on a simple network.

Solution

The following commands configure EIGRP on one router in a simple network:

Router1#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router1(config)#interface Ethernet0
Router1(config-if)#ip address 192.168.20.1 255.255.255.0
Router1(config-if)#exit
Router1(config)#interface Serial0.1 point-to-point
Router1(config-subif)#ip address 172.25.2.2 255.255.255.252
Router1(config-subif)#exit
Router1(config)#router eigrp 55
Router1(config-router)#network 172.25.0.0
Router1(config-router)#network 192.168.20.0
Router1(config-router)#exit
Router1(config)#end
Router1#

Naturally you would need to configure the other routers in this network to also exchange routing information using EIGRP process number 55. For example:

Router2#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router2(config)#interface Serial0.1 point-to-point
Router2(config-subif)#ip address 172.25.2.1 255.255.255.252
Router2(config-subif)#exit
Router2(config)#router eigrp 55
Router2(config-router)#network 172.25.0.0
Router2(config-router)#exit
Router2(config)#end
Router2#

Discussion

This example shows how simple the basic EIGRP configuration is. To get the standard default functionality, you only need to enable EIGRP and add at least one network statement. In the example, we have set the EIGRP process ID numbers on both routers to 55:

Router1(config)#router eigrp 55

This process ID number, which ...