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Internetworking Technologies Handbook, Fourth Edition by Cisco Systems, Inc.

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Chapter 44. Interior Gateway Routing Protocol

Objectives

  • Identify the metrics that IGRP uses to compare routes.

  • Explain how an administrator can influence route selection.

  • Understand multipath routing.

  • Identify IGRP's native stability features.

  • Identify IGRP's timing mechanisms and explain their purpose.

Background

The Interior Gateway Routing Protocol (IGRP) is a routing protocol that was developed in the mid-1980s by Cisco Systems, Inc. Cisco's principal goal in creating IGRP was to provide a robust protocol for routing within an autonomous system (AS). Such protocols are known as Interior Gateway Routing Protocols.

In the mid-1980s, the most popular Interior Gateway Routing Protocol was the Routing Information Protocol (RIP). Although RIP was quite ...

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