Controlling Routing Updates

By now, you have discovered that minimizing routing table size and simplifying how routers choose the next hop destination path are critical for a well-tuned IP network. When routing information from one routing protocol, such as Open shortest Path First (OSPF), is redistributed into Internet Gateway Routing Protocol (IGRP), for example, you must always be mindful of possible routing loops.

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

Routing using a single routing algorithm ...

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