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Re: DMVPN Tunnel went to NHRP state After Spoke Router Reboot

The problem is as follows:
The spoke router reboots and creates another IKE session with the hub.

The hub gets confused and deletes both crypto ike sessions, the old one and the new one.

 

The end result is that show crypto sessions will show as OK on the spoke, but there is no session on the hub!
The way out is to do clear ike sessions on spoke OR use DPD, which will reinstate the ike tunnels properly.