EIGRP Concepts and Operation
Enhanced Interior Gateway Routing Protocol (EIGRP) went through a similar creation process as compared to RIP, but with the work happening inside Cisco. Cisco has already created the Interior Gateway Routing Protocol (IGRP) in the 1980s, and the same needs that drove people to create RIPv2 and OSPF drove Cisco to improve IGRP as well. Instead of naming the original IGRP Version 1, and the new one IGRP Version 2, Cisco named the new version Enhanced IGRP (EIGRP).
EIGRP acts a little like a DV protocol, and a little like no other routing protocol. Frankly, over the years, different Cisco documents and different books (mine included) have characterized EIGRP as either its own category, called a balanced hybrid routing ...
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