I am trying to create a DMVPN design with 2 hubs, 1 primary and 1 backup, and several spokes. I have been reading of the difficulty of terminating a DMVPN tunnel onto an HSRP address and indeed I have not been able to get this to work. I have, however, been able to use the Dual Hub/Single DMVPN design where the spoke maps the tunnel endpoints to the physical outside addresses of each hub, changing the metric of the backup hub (in my case increasing the OSPF cost) to avoid routing loops.
What I am unclear about is _why_ the DMVPN tunnel will not terminate on the HSRP address. Could someone please point me to some official Cisco document indicating the incompatibility, or else if I am completely wrong point me in the direction of how to configure DMVPN with HSRP?
Thanks in advance,