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VPN primary and backup peer

We have one router (Cisco 3925E) to setup L2L VPN.

From our end, there is only one IP, But there is two IPs (Primary and Backup at client end. The client want to VPN failover. 

I set up 2 Peers for this. 

Crypto map WAN 10 ipec-isakmp

set peer

set peer


Client complains that it has happened all time for disconnection. After I take second IP ( It runs OK.

There is a feature called IPsec Prefered Peer. But I check this feature is not available on Cisco 3925E and 3945E (I hope my check wrong).

Does any one know how to configure VPN failover for this scenario?