IP Routing Topics

To do the job right, a router needs information about how to reach various parts of the network. It can get this information through static routing (i.e., including commands in the configuration that explicitly specify how to reach certain networks) or by exchanging routing information with other routers. To share this information, the router uses a routing protocol such as RIP, IGRP, EIGRP, OSPF, IS-IS, or BGP. In this chapter, we discuss a number of topics that are common to all (or most) of these protocols.