I'm trying to find out more about the if-state nhrp option for DMVPN, and more specifically how it interacts with front-door VRF. Googling cisco.com just brings up minimal info that it basically tracks the NHRP NHS and if it's unavailable, it downs the tunnel interface. I'd like a little more meat. Specifically, whether it matters which routing table the NHS is rachable via.
I'm troubleshooting a spoke with this config on it that occasionally shuts it's tunnel interface down, and it *appears* that simply pinging the NHS (via global table) wakes it back up. Kludge fix would be to setup an sla pinger if this is the case. I doubt that would fly as a true solution, though.
Anyone have info or pointers to docs?