Redundant link between two core sites with MPLS

Hi,
we have 50+ sites connected via MPLS. (see diagram)
Out core sites are SITE A (primary) & SITE B (secondary). These core sites are connected via a ptp link.
Both sites connect to the MPLS cloud via their own routers and all sites can reach SITE A & SITE B.
Now, if I pull the cable on SITE A's MPLS router, nothing can reach SITE A as expected.
Is it possible to get all of the MPLS sites to reach SITE A via SITE B's MPLS router and PtP link (and vice versa if SITE B's MPLS router went down)
Basically, redundancy if one of the MPLS routers went down at one of the core sites?

Hi,
yes, it's clearer now.
So what I'd think about would be running OSPF between the MPLS router and L3 switch on each site.
You would redistribute BGP prefixes to OSPF then.
And also configure a default route on the L3 switch pointing to the other L3 switch over the ptp line.
Plus keep the static routes for the other core site prefixes pointing to the other L3 switch over the ptp line.
That way:
1) Under normal conditions the L3 switch in site A will use a static route over ptp line (better AD than OSFP) to reach site B and vice versa.
2) In a case of MPLS router A failure:
The outging traffic from Site A would be routed via the ptp line to the L3 switch in site B (due to the default route). The L3 switch in site B will know the routes to the remote MPLS sites (received via OSPF from MPLS router B).
The incoming traffic will be received on the MPLS router B (due to prefixes for site A advertised from B with worse BGP attributes - but no prefixes advertised to MPLS from A). The MPLS router in Site B will use its static routes to forward the traffic to the L3 switch in site B. And the L3 switch will use its static routes for site A prefixes to forward the traffic over the ptp line.
Analogic routing will be applied in a case of MPLS router failure in site B.
3) In a case of the ptp line going Down:
The static routes should disapper from the routing tables on both L3 switches.
But they should still get the routes to the other core site received from OSPF (redistributed from BGP).
4) So the only problematic case might be the ptp line failing but the L3 switch interface remaining Up.
You might need to get either some tracking (not sure if available on L3 switches) or dynamic routing involved to overcome this.
Either running OSPF between the L3 switches or even runnig EIGRP to route the site A and B prefixes only possibly?
But I'm not sure if this wouldn't bring too much complexity to the design?
Best regards,
Milan

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