Exchanging EIGRP Topology Information
EIGRP uses EIGRP update messages to send topology information to neighbors. These update messages can be sent to multicast IP address 224.0.0.10 if the sending router needs to update multiple routers on the same subnet; otherwise, the updates are sent to the unicast IP address of the particular neighbor. (Hello messages are always sent to the 224.0.0.10 multicast address.) The use of multicast packets on LANs allows EIGRP to exchange routing information with all neighbors on the LAN efficiently.
EIGRP sends update messages without UDP or TCP, but it does use a protocol called Reliable Transport Protocol (RTP). RTP provides a mechanism to resend any EIGRP messages that are not received by a neighbor. By using ...
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