From: Alexei Monastyrnyi (alexeim@orcsoftware.com)
Date: Sun Oct 29 2006 - 20:00:59 ART
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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