From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Fri Jun 27 2008 - 07:52:07 ART
You can, but you don't necessarily have to. Most large scale route
reflection designs include a full mesh of peerings between clusters via
the route reflectors, but the route reflectors are not clients of each
other. This means that if reflector A peers with reflector B, and
reflector B peers with reflector C, reflector C cannot learn a route
from reflector A's cluster through B's cluster, because if A is a
non-client of B, B cannot advertise an iBGP route from A to C. However
if these is a full mesh of non-client iBGP peerings between A, B, and C,
reflector C wouldn't need to use B to get to A, since it has a direct
peering.
Ultimately for production it depends on your redundancy design.
Technically you can have every single router be a router reflector with
everyone else beings its clients. You won't cause any routing loops,
since the cluster list prevents this, but instead you'll just have a lot
of unnecessary route replication. However when we are talking about
update messages in the order of 300,000 routes for the full BGP table,
scalability from a resource management perspective is highly affected by
route reflection design.
HTH,
Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan@internetworkexpert.com <mailto:bmcgahan@internetworkexpert.com>
Internetwork Expert, Inc.
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ccie wrote:
> Hi experts,
>
> Assume I have 5 router within the same AS, and two of them will have IBGP
> peer with the rest, So I configure these two with the same bgp cluster-id,
> and configure the rest to be their route-reflector-clients. Should I
> configure these two to be route-reflector-clients to each others!!!
>
> Thanks in advance
>
> Amin
>
>
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