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IP Routing Protocols by Uyless Black

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DESIGNATED ROUTER FOR A NETWORK

The value of partitioning an autonomous system into smaller and more manageable areas is especially important for an enterprise that is faced with the interconnection of a large set of networks, routers, and hosts. To illustrate, consider networks 1 and 3 and router 1 in Figure 6-7. Router 1 connects the two networks, network 1 and network 3, an Ethernet and token ring respectively.

Figure 6-7. Designated Routers.

OSPF requires that one router be assigned the designated router for a network. In this manner, the hosts do not have to be concerned with route advertising. In this example, router 1 assumes the responsibility ...

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