[c-nsp] L2VPN Pseudowire Redundancy

[Arie Vayner (avayner)]

I would suggest that you treat these 2 parallel PW's as 2 separate L2 connections.
Each connection would be handed over to the end customer separately, and the customer can run STP end to end between their CE's.
This way the failover between PW1 and PW2 would be based on CE-to-CE STP

Alternatively, if the customer is using L3 CE's, then its just 2 parallel L3 links...

Arie 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Mateusz B?aszczyk
Sent: Sunday, November 02, 2008 21:40 PM
To: giesen at snickers.org
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] L2VPN Pseudowire Redundancy

you would have to land these xconnects on VPLS instance.
so add 4 more devices that would be your N-PEs with VPLS instance and your current PEs would become U-PEs connected to the rest of the MPLS cloud with 1 xconnect to the "active" N-PE and backup xconnect to the "standby" N-PE.

But I am not sure it is possible on 7206.



--
-mat


2008/11/2 Gary T. Giesen <giesen at snickers.org>:
> I'm not sure if this is possible, but maybe someone can give me some
> input on how to best achieve this.
>
> I'm labbing EoMPLS using 4x 7206 VXR. I'd like to create a fully
> redundant pseudowire (from the provider persective).
>
> The idea is to put two PE routers at each end of the pseudowire (with
> a common VLAN at each end shared through a switch), so that I can
> fully lose a PE router and the VC still stays up.
>
> The topology looks like this:
>
>                              [PE1]                                 [PE3]
> CE1 --- [SW1] ---<          > [MPLS CLOUD] <           >--- [SW2] --- CE2
>                              [PE2]                                 [PE4]
>
> I've tried a number of ways using xconnect-peers and backup peers (per
> http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fspseudo.html
> ), and it works great when I only have redundancy on one end, but as
> soon as I add the 4th PE, nothing works anymore.
>
> When I add the 4th PE router, PE1 forms a VC with PE3, and PE2 forms a
> VC with PE4, when in reality I should only ever have one VC formed at
> any given time, and PE2 should never form a VC with PE4 until PE1 or
> PE3 goes down.
>
> Does anyone have any suggested configurations?
>
> Regards,
>
> GG
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