From: Lupi, Guy (Guy.Lupi@eurekanetworks.net)
Date: Tue Apr 29 2003 - 18:24:42 GMT-3
Hello Juan, comments inline:
-----Original Message-----
From: jfaure@sztele.com [mailto:jfaure@sztele.com]
Sent: Tuesday, April 29, 2003 1:55 PM
To: ccielab@groupstudy.com
Subject: Redundant Route Reflector config
Hi all:
I'm reading the Halabi book and working with the RR bgp features. These are
the questions I have:
1-Is it possible to have multiple route reflectors in your AS, all these RR
belonging to the same cluster, and distribute some ibgp clients to one RR
and others clients to the other RR? This is, imagine you have 2 RR , all
the ibgp clients pointing to both, but you want that a group of these
clients learn the prefixs from the first RR and the other group from the
second RR. Obviously, you also connect the two RR with a normal ibgp
session.
The whole reason that one installs dual route reflectors is so that you have
redundancy, if laid out the way you described that advantage is no longer
present, so you would never want to do this.
2-I though that the "bgp cluster-id " command was used to purposes as
above. Anyway, reading the cd doc i understood thay you need to configure
it in the ibgp clients (to identify witch cluster they belong to), but
reading the Halabi it seems this command must be configured in the RRs, no
in the clients. I've seing that you can't add this command if you have
already added the clients in the RR, but you can add it if you remove the
clients first, then add the cluster-id and then add the clients newly. If
this is the way you must use this command, how do you do to assign some
clients to one RR and the others to other RR?
The cluster-id is the method that route reflectors use to avoid routing
loops. Whenever a route-reflector announces a route to a client, it will
add it's cluster id to the list of existing cluster ids, if there is no list
it will start one. If the route reflector ever gets a route announced to it
with it's cluster-id, it knows that a routing loop has formed and it drops
the route. The cluster id must be configured to be the same for all of the
route reflectors in a cluster. You would never assign some clients to one
RR within a cluster and some to another, all clients should have iBGP
peering sessions with all RRs within a cluster.
Any help would be apreciated.
Regards and thank you very much for your help
Juan Faure Ferrer
email: jfaure@sztele.com
Lmnea de Negocio de Telematica y CC
Ingeniero de Integracisn de Redes y Sistemas
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