Do you want routers downstream from location A to have subnets from B in their mpls forwarding table even if site B is down? If so, the only way to do this is for these routers to have location Bs subnets in their global routing table. This can be done by adding a permanent static route on router A to location Bs locations and redistributing this static route. When the connection to location B goes down, the route will remain in router As routing table and will continue to be advertised allowing this label to remain in downstream routers MPLS forwarding table.
If i understood your question correctly, you have two offices connected via MPLS & running BGP. You also said, you have Point-to-Point connection as well. Could you please share a topology to show the interconnectivities between location A & B.
you can have a static or a dynamic routing protocol running on your p2p links
Have them redistributed into BGP.
If you could share me the topology, i may be able to answer you appropriately.
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