EIGRP Neighbors

When an adjacency is formed, neighbouring EIGRP routers exchange their entire routing table, following exchanges only contain partial updates as the topology changes in the network.

EIGRP uses five different types of packets to communicate with other routers, with it’s own IP number – 88.

TypePacket NameFunction
1HelloDiscovering EIGRP neighbour and checking if a neighbour is no longer available.
2RequestUsed to get specific information from one or more neighbours
3UpdateUsed to transmit routing or reachability information to other EIGRP neighbours
4QuerySent out to search for alternative paths during convergence
5ReplySent in response to the query packet type
Types of EIGRP packet

Multicast packets are used where possible for communication between routers with the address or unicast when required.



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