Cisco Systems 78-11741-02 manual Making the Transition from Igrp to Eigrp, IPC-260

Configuring EIGRP

EIGRP Configuration Task List

Making the Transition from IGRP to EIGRP

If you have routers on your network that are configured for IGRP, and you want to make a transition to routing EIGRP, you must designate transition routers that have both IGRP and EIGRP configured. In these cases, perform the tasks as noted in the previous section, “Enabling EIGRP,” and also see the chapter “Configuring IGRP” in this document. You must use the same autonomous system number in order for routes to be redistributed automatically.

Logging EIGRP Neighbor Adjacency Changes

You can enable the logging of neighbor adjacency changes to monitor the stability of the routing system and to help you detect problems. By default, adjacency changes are not logged. To enable such logging, use the following command in global configuration mode:

Command	Purpose
Router(config)# eigrp log-neighbor-changes	Enables logging of EIGRP neighbor adjacency changes.

Configuring the Percentage of Link Bandwidth Used

By default, EIGRP packets consume a maximum of 50 percent of the link bandwidth, as configured with the bandwidth interface configuration command. You might want to change that value if a different level of link utilization is required or if the configured bandwidth does not match the actual link bandwidth (it may have been configured to influence route metric calculations).

To configure the percentage of bandwidth that may be used by EIGRP on an interface, use the following command in interface configuration mode:

Command	Purpose
Router(config-if)#ip bandwidth-percent eigrp percent	Configures the percentage of bandwidth that may be used
	by EIGRP on an interface.

Adjusting the EIGRP Metric Weights

EIGRP uses the minimum bandwidth on the path to a destination network and the total delay to compute routing metrics. You can use the eigrp metric weights command to adjust the default behavior of EIGRP routing and metric computations. For example, this adjustment allows you to tune system behavior to allow for satellite transmission. EIGRP metric defaults have been carefully selected to provide optimal performance in most networks.

Note Adjusting EIGRP metric weights can dramatically affect network performance. Because of the complexity of this task, we recommend that you do not change the default values without guidance from an experienced network designer.

Cisco IOS IP Configuration Guide

IPC-260