MPLS VPN design - RR in forwarding path?

joel jaeggli joelja at
Wed Dec 31 16:01:55 UTC 2014

On 12/31/14 4:08 AM, Marcin Kurek wrote:
> Hi everyone,
> I'm reading Randy's Zhang BGP Design and Implementation and I found
> following guidelines about designing RR-based MPLS VPN architecture:
> - Partition RRs
> - Move RRs out of the forwarding path
I'd find it odd if the RR were the nexthop for any signficant traffic,
in recent deployments I've done there's no fib to speak of excepting igp
routes installed on the RR itself.
> - Use a high-end processor with maximum memory
bgp addpath kicked up the memory requirements of the RR considerably
when we deployed it.
> - Use peer groups
> - Tune RR routers for improved performance.
> Since the book is a bit outdated (2004) I'm curious if these rules
> still apply to modern SP networks.
> What would be the reasoning behind keeping RRs out of the forwarding
> path? Is it only a matter of performance and stability?
> Thanks,
> Marcin

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