A customer has an existing Cisco ASA (ASA1) providing primary Internet and remote site VPN connectivity. One of the site-to-site VPN connections (Site X) is critical to the organization, so they need to implement a backup/failover VPN to Site X using a 2nd ASA (ASA2) connected to another ISP. Both ASAs are in-place (ASA2 currently only handling an incoming remote VPN connection).
We need to somehow configure failover for the Site X VPN - if ASA1 (or its ISP connection) fails, we need the traffic destined for Site X to automatically failover to the Site X VPN through ASA2/ISP2. We don't care about load-balancing at this point, just failover for VPN connectivity.
Thanks, and as always, reference docs/links are appreciated!