I have done route filtering between different routing protocol using route- map and redistribution it is working fine. I have used standard access-list in route-map to filter the necessary routes. But i could not understand how the standard access-list can be used to mark the routes. It just marks the packets with source address as specified in the access-list. But how it filters the route or route-updates.
For example from OSPF to EIGRP. : What I feel is that, if there is IP packet with the soutce IP address as specified in the access-list : then this list will be hit. But happens is in the redistrubuted process those routes are not seen at all ( filterout out with deny keyword). Which works fine ! But still could not understand the logic.
Please share the if it can be explained.
Thanks in advance