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IP Routing Fundamentals by Mark A. Sportack

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An Overview of IGRP

IGRP is a distance-vector protocol designed for use on interior gateway routers within an autonomous system. As explained in Chapter 7, "The Mechanics of Routing Protocols," routers that use distance-vector routing protocols regularly forward all, or part, of their routing tables to their immediate neighbors. This process recurs periodically, and recursively throughout the AS until all the nodes in that system agree on its topology and distances to known destinations.

IGRP was given an expanded capability set relative to RIP and other distance-vector protocols. One of the more revolutionary new features was the way it calculated distance vectors. Unlike previous distance vector protocols that used a single metric for calculating ...

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