Chapter 11. Redistribution

Redistribution is the process of injecting routes into a routing protocol from outside the realm of the protocol. For example, if you had a router that was running EIGRP and OSPF, and you needed the routes learned by EIGRP to be advertised in OSPF, you would redistribute the EIGRP routes into OSPF. Another common example is the redistribution of static or connected routes. Because static routes are entered manually, and not learned, they must be redistributed into a routing protocol if you wish them to be advertised.

As Figure 11-1 shows, routes learned through EIGRP are not automatically advertised out of the OSPF interfaces. To accomplish this translation of sorts, you must configure redistribution within the protocol where you wish the routes to appear.