Redistribution Between Same Protocol Networks

Although route redistribution is almost always associated with internetworking between networks that use dissimilar routing protocols, that is not its only use. Route redistribution can be an effective way of compartmentalizing networks that use the same routing protocol. For example, a large IGRP network can be logi- cally configured as two separate IGRP networks with routes redistributed between them. This would simulate the function of OSPF areas: Convergence becomes much more rapid, without compromising interconnectivity between any given pair of end systems.

Figure 14-9: Routing information is redistributed bidirectionally between the RIP and OSPF networks.

Figure 14-10 illustrates this form of route redistribution.

Figure 14-10: Route redistribution is used to compartmentalize an IGRP network.

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