I am in the midst of designing a backup solution for our Asia Pac MPLS/BGP wan. Before proceeding with the design and procurement etc I thought it best to confirm a few things. We will use dmvpn and I am planning to use a 7200 VXR at the headend though it might be a bit of an overkill. Has anyone used a smaller say 3800 series router as a dmvpn hub/headend plus what series of routers can be used as the headend that will ensure the successful operation of the dmvpn network? Would the other vpn technologies be a better alternative?