BGP route -map

[Steven Williams]

If I create a route-map that blocks routes being advertised to a neighbor (outbound routes), will I still see those routes in the local routers show ip bgp table?                  

[Vishesh Verma · Accepted solution]

Yes, a route-map applied to a BGP neighbor only filters the advertisements. You would still see those routes in local router's BGP table.

-Vishesh

[Vishesh Verma]

If you want to see the local routes use show ip bgp

If you want to see what is advertised to the neighbor use show ip bgp neighbor advertised-routes

This is a good document with some case studies of BGP -

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c95bb.shtml

-Vishesh

[Jon Marshall]

Steven

As Vishesh says you will still see them. This is because BGP has already run through the best path selection on all the routes it has received from BGP peers an placed them in the BGP table. So your route map is simply filtering what is then advertised to other BGP routers but they are still in the BGP table.

Jon