BGP communiuty filtering tech.

Answered Question
Feb 15th, 2009
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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

Correct Answer by Gregory Camp about 8 years 1 month ago

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


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Correct Answer
Gregory Camp Sun, 02/15/2009 - 21:54
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  • Cisco Employee,

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


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