EIGRP Discovery, Selection, and Route Maintenance

Routers that are loaded with the EIGRP routing protocol use the Hello protocol packets for the neighbor discovery process. The router discovery process is a dynamic activity via the Hello protocol. The Hello packets are sent to the multicast address to determine whether a neighbor is available. An adjacency relationship is a formal agreement between EIGRP neighbor devices established for the goal of exchanging routing information. When EIGRP routers receive Hello packets from a router in the same autonomous system, they will establish an adjacency (neighbor relationship). EIGRP adjacencies must occur within the same AS; therefore neighbor relationships will not form if the devices are ...

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