The easiest way is to bring up a tunnel on each router to each VPN concentrator.
On your router, you would have one crypto map that points to multiple peers:
crypt map ACS 5
set peer 1.1.1.1
set peer 1.1.1.2
etc.
If anything happens on your side, VPN concentrator goes down, then traffic wouldn't be disrupted because the tunnel on the clients end would roll over to the other concentrator.
HTH,
John
HTH,
John
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