[31661] in North American Network Operators' Group
Re: BGP Confederations
daemon@ATHENA.MIT.EDU (Robert Raszuk)
Wed Oct 4 22:56:25 2000
Message-ID: <39DBED26.DF979592@cisco.com>
Date: Wed, 04 Oct 2000 19:53:26 -0700
From: Robert Raszuk <raszuk@cisco.com>
Reply-To: raszuk@cisco.com
MIME-Version: 1.0
To: "Daniel L. Golding" <dan@netrail.net>
Cc: ccie10 <ccie10@hotmail.com>, nanog@merit.edu
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Errors-To: owner-nanog-outgoing@merit.edu
Hi ccie10,
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.
R.
> 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.
>
> - Dan Golding
>
> On Wed, 4 Oct 2000, ccie10 wrote:
>
> >
> > 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
> >
> > thanks
