Cisco CCNA Exam Tutorial: IGRP And Equal Cost Load Balancing
To pass the CCNA exam, you’ve got to know the role of the bandwidth command with IGRP and EIGRP and when to use it. In this tutorial, we’ll configure IGRP over a frame relay hub-and-spoke network using the following networks:
R1 (the hub), R2, and R3 are running IGRP over the 172.12.123.0 /24 network. This is a T1 line.
R1 and R3 are also connected on a different subnet, 172.12.13.0 /24. The bandwidth of this connection is 512 KBPS.
R2 and R3 are also connected by an Ethernet segment, 172.23.0.0 /16.
We’ll configure IGRP on R1, R2, and R3 with the router igrp 1 command. IGRP will run on all interfaces in the 172.12.0.0 and 172.23.0.0 network.
R1#conf t
R1(config)#router igrp 1
R1(config-router)#network 172.12.0.0
The 1 in the router igrp command refers to the Autonomous System (AS). IGRP is a classful routing protocol, so wildcard masks are not used in the network statements.
R2#conf t
R2(config-if)#router igrp 1
R2(config-router)#network 172.12.0.0
R2(config-router)#network 172.23.0.0
R3#conf...
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