I'm currently running a 2621XM as a DMVPN spoke with varying client from 2610/11 to 2621s. The config is pretty much out of the box DMVPN along the lines of the following KB article:
The config works flawlessly site to site with clients logging into the hub. What I would like to do is run a DMVPN hub on one of the Spokes while maintaining connectivity to the primary spoke (2621XM).
I've tried several times to duplicate the tunnels and all associated entries, but every time I finish it still only connects one tunnel. Looking at the crypto isakmp sa it shows the second connection repeatedly trying unsuccessfully to connect. This spoke is also accepting inbound client request without problem.
Any help would be appreciated.