From: nisha rani (nisharani1@googlemail.com)
Date: Mon Oct 30 2006 - 17:22:55 ART
This link may help you in understanding --
On 30/10/06, Alexei Monastyrnyi <alexeim@orcsoftware.com> wrote:
>
> 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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