Re: Merge 2 MPLS Network

If its any help I have done exactly this in the past.

We had 3 hub sites, one for each region (EMEA,AMER,APAC) and these hub sites had a connection to both providers and were learning all routes from the remotes sites advertised from each provider. We were able to summarize each regions sites into a /20 range and advertised this summary out from each hub site to both providers.

 If a remote site in provider A wants to talk to a remote site in provider B he will be routed via the /20 summary to the hub site for that region and then it will crossover and be routed out via the more specific route learned from provider B to the remote site in provider B.

Sent from my iPad

On 28 Mar 2013, at 02:44, "Joseph L. Brunner" <joe_at_affirmedsystems.com> wrote:

>> If they won't peer, and it's private L3VPN then there's not much you can do other than multi-home a site both to A and B and redistribute the routes between them.
>
> I don't know 2 carriers I would trust well enough to do this for any serious company I have as a customer now, or worked at previously...
>
> They have a hard enough time keeping our circuits up as it is...
>
> As a managed service provider I can tell you the best option is "any option you can achieve without calling any carriers". So I would do the plug 2 MPLS carriers into a routing device and making sure routes are redistributed and you have "fully reachability" thing... That should be hard enough. You will need to slowly (or quickly) make sure subnets disappear on Vendor A, sites 2-999, and reappear for a while on Vendor A, Site 1 (site where A/B are redistributed)... you will then need to make sure those sites go to Vendor B site 2-999 (reverse what you did before).
>
> Just do some basic algebra and try and figure out how you can pull this all off with the MINIMUM number of calls to either vendor...
>
> That's my advice.
>
> -Joe
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Brian McGahan
> Sent: Wednesday, March 27, 2013 8:48 PM
> To: Cisco Fanatic; ccielab_at_groupstudy.com
> Subject: RE: Merge 2 MPLS Network
>
> Did you already ask the providers if they'll run Inter-AS MPLS for you? If they won't peer, and it's private L3VPN then there's not much you can do other than multi-home a site both to A and B and redistribute the routes between them. All inter-provider traffic is going to route through the multi-homed site though, which will likely be your bottleneck and could be a single point of failure. What's the current routing design look like?
>
> Brian McGahan, CCIE #8593 (R&S/SP/Security), CCDE #2013::13 bmcgahan_at_INE.com
>
> Internetwork Expert, Inc.
> http://www.INE.com
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Cisco Fanatic
> Sent: Wednesday, March 27, 2013 6:04 PM
> To: ccielab_at_groupstudy.com
> Subject: Merge 2 MPLS Network
>
> We currently have an MPLS network provided from vendor A and we are moving to an MPLS network provided by vendor B.
> For next 3 months till all other sites get FOC dates we have to utilize MPLS network provided from vendor A. The only way around is to merge 2 networks and start routing traffic on MPLS network provided by vendor B, till all sites eventually are on vendor's B network.
> How can one merge 2 MPLS network?
> -yuri
>
>
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Received on Thu Mar 28 2013 - 08:16:05 ART