- run 6 mGRE tunnels (spoke-side) at Spoke Locations.. because you'll need the nhrp-stuff as well.
- Implement EIGRP as the routing protocol within the GRE tunnels.. there are some limitations when using OSPF (will be fixed in DMVPN Phase 3). (Cisco did recommend using a distance vector protocol once.. but they added support for OSPF after this.. and now they even support ODR!! ;)
Atleast you indicated that i'm heading in right direction.
Regarding the changes you suggested.
I would not implement mGRE at Spoke locations as i require only HUB-SPOKE Topology.
And Yes i'm going to have NHRP at Spoke locations in combination with GRE as this would help the HUB Location to dynamically create IPSEC Profiles and Map NBMA Address to Tunnel Address
On the Routing Protocol, OSPF Limitations are there on a Spoke-to-Spoke Topology with the nos of DR/BDR i can have in an DMVPN Group. But in HUB-SPOKE Topology, i'm going to have only one OSPF DR Router i.e. the HUB Router. Rest all Spoke locations i'm going to configure "ip ospf Priority 0", so that they become ineligible for DR/BDR Election in that DMVPN Group.
Also, the Route Summarization feature is currently not availablke in EIGRP as well as OSPF in DMVPN Phase 1 Implementation.
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