Filtering with Redistribution

Filtering with Redistribution
When redistributing, it may not always be desirable to redistribute all of the routes contained
in the routing protocol. If this is the case, you can filter the routes that you are going to redistribute.
You can accomplish this through the use of a route map.
Another time you may need to use filtering is when performing mutual redistribution in multiple
places between the same routing protocols. The reason for this is you may not find it desirable to
have the same route redistributed into the other protocol from multiple routers.