I'm looking for a solution for my problem. one of our branch site hav a DSL line and is connected to our headquater via L2L VPN. Now there getting a T1 line and my boss wants to keep the DSL link as a backup. Which means all VPN traffic should go then over the T1 line and when the T1 line fails it should go over the DSL line.
I had a look on the Cisco website and I thought I can do it with GRE tunnels but I don't know how to configure the router on the Branch site. Can anyone help me please.