. 2 remote locations, 2 MPLS links between

Question:

 Imaybe this is simple question WS-C3560X-24T-L for someone with MPLS experience. I have 2 locations that are connected with 2 MPLS links by 2 different ISPs. Some services go over one link, some over another link to remote location. I presume there is a static route on each server with next hop 1st or 2nd MPLS router so that's how traffic is divided. Let's presume that is truth and when 1 MPLS link goes down services on that link become unavailable. It's obvious i need to use dynamic routing protocol so path is corrected when one of the links go down. Also i need to make sure that after that broken link is restored previous path is auto restored. Which routing protocol should i implement?

Answer:

You will need to come to an agreement with the providers to enable the routing protocol so you can form a neighborship with them. Most providers do not have a problem with this. They will just enable the routing protocol - takes a bit of configuration from an MPLS point of view, but nothing that should concern you. All you are doing is enabling a routing protocol to learn routes dynamically.

Your topology would look like this...

The PE (provider edge) routers will be advertising you the networks. For example in the Remote network, you are advertising A.A.A.A to the PE routers (the service provider routers) and have formed a neighborship with them. They will then carry these routes in the MPLS VPN towards the other sites (Main site for example) on the left hand side. And the PE on the other side will advertise this to your router.

If connectivity were to fail, then the routes would stop being advertised anyway and you have a backup MPLS VPN which is also good. You can possibly loadbalance across both providers which is another benefit.

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