Configuring EIGRP
EIGRP Configuration Task List
IPC-260
Cisco IOS IP Configuration Guide
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:
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:
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.
Command Purpose
Router(config)# eigrp log-neighbor-changes Enables logging of EIGRP neighbor adjacency changes.
Command Purpose
Router(config-if)# ip bandwidth-percent eigrp percent Configures the percentage of bandwidth that may be used
by EIGRP on an interface.