EIGRP is using RTP as a Transport protocaols .Reliable Transport Protocol (RTP) is responsible for guaranteed, ordered delivery of eigrp packets to all neighborss.RTP support an intermixed transmission of multicast or unicast packets.
For Example, on Ethernet network it is not necessary to send hello packets reliably to all neighbours.So eigrp send single multicast hello packet with a flag that informs the receivers that the packet need not be acknowledged. But on other packet types such as query, update and reply indicate in the packet that acknowledgement in required. With both these features RTP ensures that convergence time remains low in the presence of varying speed links.
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