It should work but you would probably have to be running a routing protocol. OSPF is supported on the concentrators and if you also run it on your wan routers you should be able to route back to the remotes.
Don't know if this will help, but we have succesfully used IKE failovers with PIX units to various Cisco gear, however we are using dynamic crypto map in a hub and spoke configuration as opposed to static tunnels (same concepts though).
If you have on the two pixes:
crypto map MAP 10 set peer NYC
crypto map MAP 10 set peer PH
And IKE keepalives set, then if NYC tunnel fails it will try PH. The only trick here is keeping the routes updated. You have two ways that are decent. Use the reverse route injection on the Concentrators and redistribute from RIP or OSPF into whatever, or use Cisco IOS box that supports reverse route injection into EIGRP and use a floating static on the NYC side. We use a floating static route to the Concentrator (metric 240) and the use RRI on 75xx redistributed in EIGRP so once the Concentrator no longer has the SA the EIGRP routes are prefered.
It may not be an exact configuration, but the ideas are the same.
PIXes and Cisco IOS handles IKE peers fine, but I am looking for the same with Linksys, Netopia, Netgear, blah, blah, which don't respond the same for us.
DocumentationCode download linksGoalRequirementLimitationsSupported ISR
and UCS-E ModelSupported ISRG2 and UCS-E Blades:Supported ISR4K and
UCS-E Blades:Step by Step ConfigurationConfigure one of the connectivity
options to access the Cisco IMC from the n...
Firepower Threat Defense (NGFWv) on UCS E-series - Transparent Mode in
HA DocumentationCode download linksGoalRequirementLimitationsSupported
ISR and UCS-E ModelSupported ISRG2 and UCS-E Blades:Supported ISR4K and
UCS-E Blades:Step by Step ConfigurationCo...
Question I am currently unable to specify "crypto keyring" command when
configuring VPN connection on my cisco 2901 router. The following
licenses have been activated on my router :