Configuring EIGRP

Configuring EIGRP


3.2.1 Despite the complexity of DUAL, configuring EIGRP can be relatively simple. EIGRP configuration commands vary depending on the protocol that is to be routed. Some examples of these protocols are IP, IPX, and AppleTalk. This page describes EIGRP configuration for the IP protocol.
Perform the following steps to configure EIGRP for IP:

1. Use the following to enable EIGRP and define the autonomous system:

router(config)#router eigrp autonomous-system-number

The autonomous system number is used to identify all routers that belong within the internetwork. This value must match all routers within the internetwork.

2. Indicate which networks belong to the EIGRP autonomous system on the local router by using the following command:

router(config-router)#networknetwork-number

The network-number is the network number that determines which interfaces of the router are participating in EIGRP and which networks are advertised by the router.

The network command configures only connected networks. For example, network 3.1.0.0, which is on the far left of the main Figure, is not directly connected to Router A. Consequently, that network is not part of the configuration of Router A.

3. When configuring serial links using EIGRP, it is important to configure the bandwidth setting on the interface. If the bandwidth for these interfaces is not changed, EIGRP assumes the default bandwidth on the link instead of the true bandwidth. If the link is slower, the router may not be able to converge, routing updates might become lost, or suboptimal path selection may result. To set the interface bandwidth, use the following syntax:

router(config-if)#bandwidthkbps

The bandwidth command is only used by the routing process and should be set to match the line speed of the interface.

4. Cisco also recommends adding the following command to all EIGRP configurations:

router(config-router)#eigrp log-neighbor-changes

This command enables the logging of neighbor adjacency changes to monitor the stability of the routing system and to help detect problems.

In the Lab Activities, students will set up an IP address scheme and configure EIGRP.
The next page will discuss EIGRP summarization.