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EIGRP uses a proprietary protocol called Reliable Transport Protocol (RTP)
to deal the communication of substances between EIGRP-speaking routers. And as the name indicates, reliability is a key care of this protocol. Cisco has designed a mechanism that leverages multicasts and unicasts to present updates rapidly and to track the receipt of the data.

When EIGRP places multicast traffic, it uses the Class D address 224.0.0.10. As I said, each EIGRP router is conscious of who its neighbors are, and for each multicast it sends out, it keeps a list of the neighbors who have answered. If EIGRP doesn’t get a response from a neighbor, it will switch to using unicasts to resend the synoptical data. If it still doesn’t get a reply after 16 unicast efforts, the neighbor is declared dead. People often mention to this process as reliable multicast
.
Routers keep path of the info they send by putting a sequence number to each
packet. With this technique, it’s possible for them to detect the comer of old, unnecessary, or out-of-sequence information. Being able to do these matters is extremely large because EIGRP is a quiet protocol.

It depends upon its power to synchronize routing databases at inauguration time and then maintain the consistency of databases over time by only communicating any changes. So the permanent release of any packets, or the out-of-order execution of packets, can result in corruption of the routing database.

EIGRP roles Diffusing Update Algorithm (DUAL) for taking and maintaining the best path to each remote network. This algorithm allows for the following:

Backup path determination if one is procurable

Indorse of VLSMs

Dynamic route recoveries

Inquiries for an alternate route if no route can be learned

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