[177217] in North American Network Operators' Group
Re: MPLS VPN design - RR in forwarding path?
daemon@ATHENA.MIT.EDU (Mark Tinka)
Thu Jan 8 10:09:23 2015
X-Original-To: nanog@nanog.org
From: Mark Tinka <mark.tinka@seacom.mu>
To: nanog@nanog.org
Date: Thu, 8 Jan 2015 17:09:03 +0200
In-Reply-To: <CAJXc8RK2r5ZY-K-F2OuNrGg68TDLOdbd17H52tn4BAiHp-wMDw@mail.gmail.com>
Reply-To: mark.tinka@seacom.mu
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On Friday, January 02, 2015 11:03:21 PM Daniel Rohan wrote:
> Also think physical topologies like ethernet rings.=20
> Where's the RR go in this topology?
In these topologies, I've been playing with having the RR's=20
in the core (i.e., on the other end of the PE Aggregation=20
routers terminating the ring) and running the iBGP sessions=20
between the Metro-E Access switches and the RR's.
As the RR's are MPLS-free (but the Metro-E Access switches=20
[particularly Cisco] still assign MPLS labels to each IGP=20
route), we cobble together a combination of hop-by-hop IP=20
forwarding + MPLS forwarding fu to get traffic to where it=20
needs to go without involving the PE Aggregation routers in=20
the routing toward the Metro-E Access switches (i.e., 0/0=20
and ::/0 + a few more specifics come from the RR's).
Been working with this routing topology for MPLS rings since=20
2009. It seems to hold up...
Mark.
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