[31664] in North American Network Operators' Group
Re: BGP Confederations
daemon@ATHENA.MIT.EDU (Brian Wallingford)
Thu Oct 5 03:02:37 2000
Date: Thu, 5 Oct 2000 02:59:29 -0400 (EDT)
From: Brian Wallingford <brian@meganet.net>
To: Robert Raszuk <raszuk@cisco.com>
Cc: "Daniel L. Golding" <dan@netrail.net>,
ccie10 <ccie10@hotmail.com>, nanog@merit.edu
In-Reply-To: <39DBED26.DF979592@cisco.com>
Message-ID: <Pine.LNX.4.10.10010050254060.1135-100000@cerise>
MIME-Version: 1.0
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Errors-To: owner-nanog-outgoing@merit.edu
FWIW, I'd consider a current case study on such very worthwhile on CCO.
The talent is certainly there, so let's see some less-than-stale content.
-brian
: Have you considered reflectors ? The configuration is trival and
: migration easy. Is your reason for confederations partitioning based on
: the need to run multiple IGP instances in your network ? If so what IGP
: are you running today (having full mesh of ibgp) and how big is the
: network we are talking about here ?
:
: I am asking as I wonder why scaling ibgp mesh with reflectors was not
: chosen as the prefered option.
:
: > It's not a fun process. I've given the matter quite a lot of thought.
: > There are no easy ways to do this. Of course, with sufficient planning,
: > some scripts, a good lab environment, and a few hours of downtime, a
: > network can be transitioned. I don't recommend it for faint of heart. The
: > best candidates for a BGP Confederation design are isolated eBGP networks
: > (i.e. networks where AS border routers run eBGP, with no iBGP mesh) and
: > greenfield networks. The last network I worked with that made a successful
: > transition was Mindspring, AS4355, and they fell into the former category.
: >
: > The big question is, how big is the network. It's a trivial transition
: > with 10 routers, lets say. If you have 100 fully meshed iBGP peers, I
: > wouldn't bet on it. Also, implement communities - they make certain
: > aspects of confederation configuration much easier.
: >
: > For more information on confeds, check on the NANOG web site. There are
: > several archived presentations on the subject.
: >
: > > Is there an easy way to migrate an existing network running IBGP full mesh
: > > to a
: > > Condederation based configration. Any documentation that I have come across
: > > states that current BGP configs need to be redone and all peering
: > > relationships must torn down and rebuilt. Any addtional info/links regarding
: > > confederations would be appreciated
:
