Hi Kyle,
You can set up the redundant VPN tunnels with the help of SLA monitoring. SLA monitoring defines which interface would be active and accordingly with which IP the tunnel would be negotiated.
On your side, you can set the primary and backup peers with this command:
crypto map set peer
Along with this, we need to create two tunnel groups for both the peers.
On Remote end, SLA monitoring will be configured and crypto map should be enabled on both the interfaces
This can be achieved with the following commands:
crypto map interface primary
crypto map interface secondary
sla monitor x
type echo protocol ipIcmpEcho interface primary
num-packets 3
frequency 10
sla monitor schedule x life forever start-time now
track 1 rtr x reachability
route primary 0.0.0.0 0.0.0.0 172.16.10.10 1
route backup 0.0.0.0 0.0.0.0 172.16.20.10 254
Please go through the given document that explains the Redundant ISP configuration in detail
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00806e880b.shtml
Hope that helps.
Regards,
Dinesh Moudgil
Cisco Network Security Channel - https://www.youtube.com/c/CiscoNetSec/