Case Study Multiple IGRP Processes

Two new routers, Lovett and Harriman, have been added to the internetwork (Figure 6.18). A decision has been made to create two IGRP autonomous system "domains" in the internetwork with no communications between the two. Figure 6.19 shows the two autonomous systems and the related links for each.

Figure 6.18. Separate routing domains are to be created in this internetwork.

Figure 6.18. Separate routing domains are to be created in this internetwork.

Figure 6.19. The routers Harriman and Acheson will each run multiple IGRP processes to facilitate the creation of separate autonomous systems (AS 10 and AS 15) within this IGP.

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The configurations for Bohlen, Lovett, McCloy, and Kennan are straightforward: Bohlen, Lovett, and

McCloy will run IGRP 10, and Kennan will run IGRP 15. At Acheson, the configuration will be:

router igrp 10 network 192.168.2.0 network 192.168.3.0

router igrp 15 network 172.16.0.0

Each process will run only on the interfaces of the networks specified. At Harriman, both interfaces belong to network 10.0.0.0:

router igrp 10 passive-interface TokenRing0 network 10.0.0.0

router igrp 15 passive-interface Serial0 network 10.0.0.0

Using the passive-interface command prevents IGRP updates from being broadcast on data links where they don't belong.

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