we have two ASA 5510 connected through MPLS network, and there is other route with T1 to the internet. I'd like to configure VPN tunnel as backup. If MPLS get down, I want ASAs initiate VPN connection with each other and create a tunnel. If you show me a document and shows this configuration, I'll be very appreciated. Both ASA have one outside interface though with default route to the MPLS network.