From: premkumar somasundaram (premkumar.somasundaram@gmail.com)
Date: Tue Mar 13 2007 - 15:34:05 ART
Thanks Brain..
On 3/13/07, Brian McGahan <bmcgahan@internetworkexpert.com> wrote:
>
> By default all community values (standard and extended) are
> stripped from BGP advertisements when sent to iBGP or EBGP neighbors.
> If you want to propagate community values on you must use the
> send-community option at the end of the neighbor statement.
>
> The issue you're running into is dependent on whether you have
> the community set locally or you are setting the community value
> outbound to the neighbor. If you receive a prefix with the community
> no-advertise you don't necessarily need the "send-community" option on
> to your neighbors because the prefix is not candidate to be advertised
> to the neighbors regardless. If you receive a prefix with a community
> of no-export for example you will not advertise it to EBGP neighbors,
> but when you advertise it to iBGP neighbors the community attribute will
> be stripped unless you add the send-community value at the end of the
> neighbor statement.
>
>
> HTH,
>
> Brian McGahan, CCIE #8593 (R&S/SP)
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
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>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> premkumar somasundaram
> Sent: Tuesday, March 13, 2007 7:16 AM
> To: ccielab@groupstudy.com
> Subject: Community List
>
> GS,
> I have a doubt about community list in bgp. When do we want use the
> neighbour x.x.x.x send -community. When I use the community value,
> No-export, I must use the neighbour x.x.x.x send-community. But when I
> use
> the community value, No-advertise, even when I am not using neighbour
> x.x.x.x send-community, it solves the purpose. Is there any logic behind
> the
> use of send-community or am I going wrong somewhere??
>
> Thanks
> prem
>
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