Failover from MPLS to VPN and Back to MPLS

Experts:

I have a client that has 5 sites thoughout the US and one abroad.  All connections are directed to the One Main office and none to each other. What they would like to happen is that IF a MPLS link goes down, to Failover to a VPN (Site to Site) Connection, and once the MPLS link comes back online, they would rollback to the MPLS line from the VPN Connection. All sites are currently using all Cisco Gear and the FW's are ASA  5510. If anyone would happen to know the best way of going about this, I would be forever in your debt. If you could include commmands that would be even better.

I look forward to hearing solutions to my situation.

Thanks
rperaultAsked:
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evan_weinerCommented:
I have used LAN-to-LAN VPN tunnels running GRE for multiple clients.  With this, you can add as many carriers/connections as you want and the routing takes care of all of it for you.
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rperaultAuthor Commented:
They have used GRE IPSec in the past and have now had the network completely configured using MPLS with Dedicated Lines between Sites, and thats the reason for the VPN Failover, for when those Links go done, the VPN Connection will take over.
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evan_weinerCommented:
You can still use the IPSec/GRE configuration on top of MPLS.  That way, it's persistent and doesn't have the delay of a connection.  Do you have any control over the MPLS routing?
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rperaultAuthor Commented:
Thanks
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