OSPF Network Design Solutions: Redistribution

Tom Thomas

OSPF Network Design Solutions

Chapter 6: Redistribution

This excerpt is reprinted with permission from Cisco Press. For more information or to order the book, visit the Cisco Press Web site.

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By now, you have discovered that minimizing routing tables and choosing the next-hop destination path are critical for a well-tuned IP network. When routing information from one routing protocol, such as OSPF, is redistributed into IGRP, you must be mindful of possible routing loops.

A routing loop is a path to a remote network that alternates between two routers that assume the path is reachable via each other. Hence, the time to live that is present in every IP packet expires, and the packet or user data is dropped, resulting in loss of network connectivity.

Routing that uses a single routing algorithm is usually more desirable than running multiple IP and non-IP routing protocols, especially from a configuration and troubleshooting perspective.

However, in today's changing networks and with mergers, department politics, and acquisitions, more than one IP routing protocol is likely in use.

Before "diving in," you first need a definition of redistribution and summarization to clarify your understanding of these concepts. These are potentially confusing topics. Hopefully, they will be clearer to you after reading this chapter and Chapter 7, "Summarization."

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