The exchange of link state information between neighbors can create significant quantities of network traffic. To reduce the total bandwidth required to synchronize databases and advertise link state information, a router does not necessarily develop adjacencies with every neighboring device:– Multi-access networks: Adjacencies are formed between an individual router and the (backup) designated router.– Point-to-point networks: An adjacency is formed between both devices. Each multi-access network elects a designated router (DR) and backup designated router (BDR). The DR performs two key functions on the network segment:– It forms adjacencies with all routers on the multi-access network. This causes the DR to become the focal point for forwarding LSAs.– It generates network link advertisements listing each router connected to the multi-access network. The BDR forms the same adjacencies as the designated router. It assumes DR functionality when the DR fails.Each router is assigned an 8-bit priority, indicating its ability to be selected as the DR or BDR. A router priority of zero indicates that the router is not eligible to be selected. The priority is configured on each interface in the router.
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