Have a 6500 using the vpn spa with ipsec tunnels. The plan is to migrate all tunnels over to DMVPN. When we configured the mGRE tunnel and bring it up, all the other tunnels slowly drop. As soon as we shutdown the mGRE tunnel, all other tunnels come up. We have a tunnel key set for the mGRE tunnel. The only limitations I could find were that we only source 1 mGRE tunnel from an interface, I could not find anything about sharing and interface with p3p tunnels. Anyone know if it is possible to source an mGRE tunnel and p3p tunnel from the same interface?
I have this problem too.