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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.
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