IGRP configuration example

FIGURE 4 . 3 IGRP configuration example
This would configure IGRP for the network. If you decide to cut down on excess bandwidth
usage on the Ethernet segment of Router1, you will make interface Ethernet 0 passive. Here is
the configuration that would accomplish this:
Router1>enable
Router1#configure terminal
Router1(config)#router igrp 100
Router1(config-router)#passive-interface e0
That’s all there is to it. As you can see, configuring IGRP is a straightforward process. From
personal experience, I ask you to remember one thing about IGRP, or any other routing protocol
for that matter: Do not adjust timers or K-values unless it is for an important reason and you
thoroughly understand the consequences. Adjusting these parameters in a production network
can cause serious problems, and you will not want to deal with the repercussions.
IGRP 100
S0
S0
S1 S1
S1
S0
E0
.1
.1
.1 .1
.2
.2
.2
172.16.21.0/24
Ethernet
Router1
Router3
Router2
172.16.100.0/24
192.168.100.0/24
192.168.21.0/24