Chapter Ten. Enhanced IGRP

This chapter describes principles of operation of another class of routing protocols: hybrids. Hybrid routing technique is based on the distance-vector algorithms but also incorporates some features, such as adjacencies between neighboring routers or guaranteed message delivery, usually found in link-state routing protocols. The sole routing protocol in this group is enhanced IGRP (EIGRP), implemented by Cisco Systems and based on theoretical work done by J. J. Garcia Luna Aceves.

Basic Description and History

Although the name implies that EIGRP is an enhanced version of IGRP, the only thing these two protocols have in common is the attributes used for route metric calculation: effective path bandwidth, cumulative path ...

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