From: Alexei Monastyrnyi (alexeim@orcsoftware.com)
Date: Mon Oct 30 2006 - 13:08:24 ART
I was completely wrong here.
advertise-map is used to conditionally advertise a summary if a route
matched by this route-map exists.
Tried that in lab and no communities are inherited by summary when using
advertise-map. Must have got confused.
Sorry for the mess.
A.
Alexei Monastyrnyi wrote:
> Hi.
>
> I think it works like this.
>
> If you have a number of routes with long prefix, say /24, and want to
> build /23 or shorter summary out of this set of routes, without
> advertise-map all /24 route attributes will be participating in
> forming a cumulative attribute list for the summary. If you want to
> inherit attributes from particular routes, you pick them with
> advertise-map.
>
> For example some /24 routes have community no-export, you build a
> summary out of all routes and as a result it is going to have
> community no-export. Hence, it is not going to be propagated out of
> your AS even if it was designed to be advertised outside it. Of course
> you can tweak this community explicitly later.. So it is really
> depends on goals, I think, what tool to use.
>
> HTH
> A.
>
> Adhu Ajit wrote:
>> Folks, in the BGP aggregate address command, I do understand how the
>> attribute-map option works. However, I do not quite understand how
>> the <advertise-map> option works. Does someone have a config that
>> would explain it to me plain and clear ?
>> Thanks in advance.
>>
>>
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