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EIGRP uses RTP for Reliable communication..
EIGRP its self is a protocol. EIGRP uses5 different types of Packets.
(Hello, Update, Query Reply, Acknowledge)
Hello packets are used to from neighbour relationships.
Update packets: after hello packets and neighbor relation ships are formed. update packets are used to exchange routing tables
Query: if the sucessor is down and there is no feasible sucessor. then query packets are used to search for the next path from its neighbors
reply: when a router recieve a query from its neighbor it will reply it back
acknowledge: they are used for relaiblility of data. to make sure that packets are reaching their destinations.
you can view my artical on EIGRP on my website.(www.itmag.weebly.com/eigrp.html)
Hope this will help you to understand about EIGRP
