From: Nicolai Gersbo Solling (nicolai@xxxxxxxxx)
Date: Tue Mar 19 2002 - 09:38:54 GMT-3
Hi there Dr. Preppers!
I have investigated my bgp community no-export problem a bit more...
If you have an EBGP connection on R1 to R2 and set the community in a
route-map on the neighbor statement from R1 to R2 then R2 will pick up the
route and propogate it through it's own AS, but not to any peering AS'es...
This is an entirely straightforward action from BGP community...
However...if you have a network statement on R1 which has a route-map that
sets the community to no-export then the route will be installed in R1's bgp
table with the community allready set!
That means that R1 will not forward the prefix (route) to any neighboring
AS'es! However it will forward the route to any IBGP peers...But...a little
gotcha is that you need to have neighbor send-community on the other IBGP
peers, otherwise they may forward the route to neighbporing AS'es!
So to make a short story long...
There is a lot of difference in the apperance of BGP if you set the BGP
community on a network statement in compariosn to setting it on a neighbor
statement....
Nic
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Nelson Salvatorelli
Sent: 19. marts 2002 00:13
To: Nicolai Gersbo Solling; CCIE
Subject: RE: Community no-export
Nicolai,
Setting communities on network statements in BGP should work perfectly.
Actually this is quite useful when tagging your own routes and customer
routes. What IOS release are you running? It may be a bug or misconfig?
Send us the configuration you are trying.
Cheers,
-nelson
> -----Original Message-----
> From: Nicolai Gersbo Solling [mailto:nicolai@cisco.com]
> Sent: 18 March 2002 22:10
> To: CCIE
> Subject: Community no-export
>
>
> Hi there!
>
> I am encountering a special behaviour from BGP!
>
> Can it really be true that one can only set the community on
> the neighbor statement? I have tried to do it by adding a
> route-map on the network statement but that does not work -
> As soon as it is set on the neighbor statement it works like a dream!
>
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