7.3 Route Redistribution
7.3.1 Redistribution overview
To support multiple routing protocols within the same internetwork efficiently, routing information must be shared among the different routing protocols. For example, routes learned from a RIP process may need to be imported into an IGRP process. This process of exchanging routing information between routing protocols is called route redistribution. Such redistribution can be one-way (that is, one protocol receives the routes from another) or two-way (that is, both protocols receive routes from each other). Routers that perform redistribution are called boundary routers because they border two or more autonomous systems or routing domains. This section examines route redistribution in detail, including the use of administrative distance, guidelines for redistribution implementation, and issues with redistribution configuration.