Case Study A Basic IGRP Configuration

Only two steps are necessary to configure IGRP:

1. Enable IGRP with the command router igrp process-id.

2. Specify each major network on which to run IGRP with the network command.

The process ID is carried in the 16-bit autonomous system field of the update packet. The selection of a process ID is arbitrary—any number between 1 and 65,535 (0 is not allowed) can be used, as long as it is used consistently on all routers that must share information via that particular IGRP process. Figure 6.11 shows a simple internetwork; the configurations for the three routers are as follows:

Figure 6.11. IGRP will perform address summarization at these three network boundary routers.

Figure 6.11. IGRP will perform address summarization at these three network boundary routers.

McCloy(config)#router igrp 10 McCloy(config-router)#network 192.168.1.0 McCloy(config-router)#network 192.168.2.0

Acheson(config)#router igrp 10 Acheson(config-router)#network 192.168.2.0 Acheson(config-router)#network 172.16.0.0

Kennan(config)#router igrp 10 Kennan(config-router)#network 172.16.0.0 Kennan(config-router)#network 10.0.0.0

IGRP will perform subnet hiding, or summarization, at network boundaries. In the case of Figure 6.11, all three routers are network boundary routers.

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