Re: iBGP RR Cluster ID - What is best practice?

From: Narbik Kocharians (narbikk@gmail.com)
Date: Wed Nov 26 2008 - 15:02:17 ARST

You mean you know an ISP that actually does that?

On Wed, Nov 26, 2008 at 3:15 AM, Marko Milivojevic <markom@markom.info>wrote:

> On Tue, Nov 25, 2008 at 21:34, Narbik Kocharians <narbikk@gmail.com>
> wrote:
> !
> > But i don't know of a provider that configures the cluster-id, typically
> a
> > RR-client must be a client in at least 2 or more clusters, this way the
> > provider maximizes its availability.
>
> It's actually very common practice when deploying hierarchical route
> reflection (global RR's reflect to regional RR's which reflect to
> local RR's and vice-versa).
>
> In this kind of scenario, where redundant route-reflectors are at the
> same time route-reflector clients, forming a loop is very real danger.
> The "only" way to prevent these loops is careful cluster-id planning
> and I'm more than certain that these are set manually to values other
> than BGP router-id :-).
>
> --
> Marko
> CCIE #18427 (SP)
> My network blog: http://cisco.markom.info/
>
>
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-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining
www.Net-Workbooks.com
Sr. Technical Instructor

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