From: Anshuk Kesarwani (anshuk.ccie@gmail.com)
Date: Fri Sep 28 2007 - 09:11:56 ART
Hi John,
Just wondering whether you are advertising 150.1.x.x/24 in the network
statement of BGP.
If that is the case then the network will not be even in the local BGP table
as BGP looks for a exact match in the routing table before entering in the
BGP table.
If you just advertise 150.1.x.0/24 in the network statement itself , there
will be no need to apply prefix list for route maps.
Correct me if I have misunderstood your query.
Regards
Anshuk
On 9/28/07, John <jgarrison1@austin.rr.com> wrote:
>
> I'm having a hard time understanding advertise-map.I have a hub and spoke
> BGP
> setup. R1, R2, and R3 are the spokes R5 is the hub. R1, R2, R3 are
> advertising 150.1.x.x/24(x represents the router number). On R5 I
> aggregate
> the address to aggregate-address 150.1.0.0/21 with as-set, summary-only
> and
> advertise-map added on. The part I'm not getting is for the spokes to
> recieve
> the aggregate I have to include the 150.1.x.0 in the prefix-list that the
> route -map is using. Does BGP compare the advertise-map to incoming
> advertisements and then sends advertisements to all matches. Does BGP
> then
> strip off the as-set and advertise the aggregate route? Because if it
> doesn't
> strip of the as-set than the as-set will contain the originating AS and
> therefore break the loop avoidance rule?
>
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