[c-nsp] Advertised community in BGP

[Cisco List]

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Actually, to send communities to a peer you need:

neighbor x.x.x.x send-community [extended, standard, both]

In order to pass communities on to a peer.  If you have a route-map
that is tagging a community for the peer be sure that you aren't also
stripping of the communities that were on the route.  For example,
the following if applied to a peer will remove any existing
communities and add the 1:100 community.

router bgp xxx
 neighbor x.x.x.x remote-as xxx
 neighbor x.x.x.x send-community
 neighbor x.x.x.x route-map something-out out
!
route-map something-out permit 10
 set community 1:100

If you want to add 1:100 to any existing routes to a peer you could
modify the above to look like this.

router bgp xxx
 neighbor x.x.x.x remote-as xxx
 neighbor x.x.x.x send-community
 neighbor x.x.x.x route-map something-out out
!
route-map something-out permit 10
 set community 1:100 additive


Hope that helps,
Chad


- ----------------------------
Chad E Skidmore
One Eighty Networks, Inc.
http://www.go180.net
509-688-8180   


> -----Original Message-----
> From: Michael Smith [mailto:mksmith at noanet.net] 
> Posted At: Tuesday, December 14, 2004 10:55 PM
> Posted To: Cisco List
> Conversation: [c-nsp] Advertised community in BGP
> Subject: RE: [c-nsp] Advertised community in BGP
> 
> 
>  
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> 
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp- 
> > bounces at puck.nether.net] On Behalf Of dje
> > Sent: Tuesday, December 14, 2004 12:00 PM
> > To: cisco-nsp at puck.nether.net
> > Subject: [c-nsp] Advertised community in BGP
> > 
> > All,
> > 
> > 
> > Is there a command available on Cisco routers to see the 
> communities 
> > being advertised *to* a BGP peer? The only command I can 
> find to show 
> > advertised routes is 'show ip bgp neighbor x.x.x.x 
> advertised-routes' 
> > but there is nothing to see what communities are being sent.
> > 
> > Thanks,
> > 
> > Daniel Evans
> > 
> 
> Well, if you use the 'show ip bgp community/community-list aa:nn'
> command it will tell you what routes are associated with a 
> particular community.  I think the community is always 
> advertised, so you can assume (dangerous, I know) that the 
> associated route is being advertised with the community in question.
> 
> Mike
> 
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