Route Redistribution

This is the concept when routing information must be exchanged between different protocols or routing domains. Only routes that are in the routing table and learned via the specified protocol are redistributed. 

Redistribution Characteristics

RIP - Default metric is Infinity. Metric must be set, except when redistributing static or connected routes, which have a metric of 1.

OSPF - Default metric is 20. Can specify the metric type; the default is E2. Must use subnets keyword or only classful networks are redistributed.

EIGRP - Default metric is Infinity. Metric must be set, except when redistributing static or connected routes, which get their metric from the interface. Metric value is "bandwidth, delay, reliability, load, MTU." Redistributed routes have a higher administrative distance than internal ones.

Static/Connected - To include local networks not running the routing protocol, you must redistribute connected interfaces. You can also redistribute static routes into a dynamic protocol.

BGP - Metric (MED) is set to IGP metric value.

Command:

Router(config-router)# redistribute {route-source} [metric metric] [route-map tag]