VPN failover over ISDN

[cmorris_DRI]

I am setting up a new site, and our plan is to have a main internet connection with A GRE tunnel that the ISDN monitors to see if it needs to come up. We also need to make a VPN tunnel from behind this router over the main internet connection and then when it fails, over the ISDN internet connection. How would this be done? With 2 seperate tunnels, one to the main IP address and one to the ISDN IP address? I am not quite sure how this will work.

[smahbub]

I think the following document will answer your question. This will give you some good idea on vpn configguration.

http://www.cisco.com/en/US/products/hw/routers/ps341/products_configuration_guide_book09186a008051522f.html