Getting BGP to send routes

While getting a route advertiesed in an IGP like OSPF is pretty simple, getting it into BGP or redistributed can be a little more tricky. Routing process are event driven that is something has to happen to force the router (or L3 switch) to scan the tables. If you say add a network statement in BGP for a route that already exists, it may not go out to the rest of the network for awhile. This can usually be fixed with a clear ip bgp soft out but it is better to follow the following rule. Before bringing up an interface or adding a default route, make sure that all the the routing protocol configuration is in place BEFORE, so if you have a ACL on your redistribution statement, update the ACL, add any network statements you need on the routing protocol configurations, update route maps if needed. THEN bring up the interface, add the IP address to the SVI, or add the new static route. Those are events that will drive the routing protocol. Finally not everything is done in BGP by clearing a neighbor soft out, there are courner cases where the routeing logic is not fully driven. In that case shut/no shut, or remove and add is needed.