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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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EIGRP Features and Operation

Enhanced IGRP (EIGRP) is a classless, enhanced distance-vector protocol that uses the concept of an autonomous system to describe the set of contiguous routers that run the same routing protocol and share routing information. EIGRP includes the subnet mask in its route updates because it is considered classless. And as you now know, the advertisement of subnet information allows us to use Variable Length Subnet Masks (VLSMs) and manual summarization when designing our networks!

EIGRP is sometimes referred to as a hybrid routing protocol because it has characteristics of both distance-vector and link-state protocols. For example, EIGRP doesn’t send link-state packets as OSPF does; instead, it sends traditional distance-vector ...

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