EIGRP configuration

EIGRP can be configured using only two commands:

1. (config) router eigrp ASN – starts EIGRP on the router. In order to become EIGRP neighbors, routers must be configured with the same AS number. You can use any number between 1 and 65,535.

2. (config-router) network SUBNET [WILDCARD_MASK] – a network command does two things:

  • for each interface matched by the network command, EIGRP tries to discover neighbors on that interface.
  • the subnet connected to the interface matched by the network command will be advertised.

 

By default, the network command accepts a classful network number as a parameter.

 

Consider the following example:

eigrp configuration example network

We have a simple network of two routers. Here is how we can configure EIGRP on both routers:

1. on R1, we need to enable EIGRP with the ASN of 1 and use the network command to match the interface direcly connected to the 10.0.0.0/24 network:

eigrp configuration r1

2. on R2, we need to enable EIGRP with the ASN of 1, use the network command to match the interface direcly connected to the 10.0.0.0/24 network, and advertise the 192.168.0.0/24 network:

eigrp configuration r2

To confirm that the EIGRP neighbor relationship has been established, we can use the show ip eigrp neighbors command:

show eigrp neighbors

In the picture above you can see that R1 has a single neighbor with the IP address of 10.0.0.2.

To verify that R1 has received a route to reach the 192.168.0.0/24 network, we can use the show ip route eigrp command:

show eigrp routes

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Geek University 2019