BGP communiuty filtering tech.

[syjeon]

I would like to filter bgp route update tagged specific community-list from neighbor bgp router.

for example, A router bgp update like below

1.1.1.0/24 set community 100:10

3.3.3.30/24 set community 100:20

B router doesn't update 100:20, but accept 100:10 route, Is it possible?

How can I configure on B Router?

The point of my question is that B router doesn't update specific community-tagged route, when updating route from A

thank you

[Gregory Camp · Accepted solution]

You can filter an update from A to B with a simple route-map matching a community-list. The route-map below will only permit routes in with the community 100:10 set.

ip community-list 1 permit 100:10

route-map Filter-A permit 10

match community 1

router bgp 1

neighbor A.A.A.A route-map Filter-A in