[c-nsp] Two mpls provider with the same core AS# workaround

[Arie Vayner (avayner)]

Roger,

If I had to design it, I would have used "remote-private-as" with both providers, and use BGP communities to avoid BGP routing loops. Basically each route received on a different peer can be marked with a BGP community, and then you can filter the routes sent to the same peer so that this community is not sent back out.

Arie

-----Original Message-----
From: roger.wiklund at gmail.com [mailto:roger.wiklund at gmail.com] On Behalf Of Roger Wiklund
Sent: Monday, September 20, 2010 14:46
To: Arie Vayner (avayner)
Cc: Cisco-nsp
Subject: Re: [c-nsp] Two mpls provider with the same core AS# workaround

1. The providers are running L3VPN in their MPLS. We have CE sites
that run BGP to the PEs.

2. We are the customer.

So basically we have 2 providers, in the middle we have our network,
where we get all the routes from each provider. And we want to
propagate the routes via BGP between them.

Regards
Roger

On Mon, Sep 20, 2010 at 2:25 PM, Arie Vayner (avayner)
<avayner at cisco.com> wrote:
> Roger,
>
> What kind of services these network run (Inter-AS L3VPN)?
> What kind of service does your network provide in the scheme of all
> things (are you a transit MPLS provider, the customer etc)?
>
> Arie
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Roger Wiklund
> Sent: Monday, September 20, 2010 12:37
> To: Cisco-nsp
> Subject: [c-nsp] Two mpls provider with the same core AS# workaround
>
> Hi.
>
> Scenario: Two MPLS providers, one major with bulk of the sites. one
> minor with ~10 sites.
> Both providers have the same AS# in the core, and I want to exchange
> routes between these providers (via our network, not directly betweent
> the providers).
>
> to overcome this, I thinking about some different approaches (on the
> minor MPLS provider side/in our own network)
>
> BGP aggregate (in our network)
> allow-as in (minor MPLS providers network)
> local-as + allow-as in (minor mpls providers network)
> remove private as function in IOS 15.1(2)T (can remove private AS even
> if you have a mix of public and private AS#)
>
> Anyone with some experience on this and how this best can be solved?
>
> Thanks!
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