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ASA 9.1 - dual VPN (ISP-1 static IP, ISP-2 dynamic IP) possible?

Hi everyone,

I am preparing a design where I have 2 ASAs in L2L VPN config for main ISP-1 using of course public and static IPs. But it get interesting where we will be adding a backup ISP-2 on each site but only with public and dynamic IPs. Would it be possible to have 2 VPN tunnels L2L configured on each ASA and the tunnel over ISP-1 will be the primary to carry the data and voice traffic and the tunnel over ISP-2 will be the backup tunnel? How is that accomplished? With the metric on the static routes? The thing is that I want the ISP-1 to be always the prefered VPN tunnel (more bandwidth available) when the ISP-1 is restored after the service failure.

In regrards to the ISP-2 and public/dynamic IPs, how can it be accomplished? I thought of on ASA-1 the ISP-2 will be configured as a VPN client to the ASA-2 on ISP-1 (static IP available) and vice verse on the opposite side. But can be ASA configured for both L2L server and client and the same time?

Thanks for any suggestions.