Go to DMVPN Part 1
4. DMVPN Routing Configuration
So each router doesn't know about the other routers attached networks (in this case its the loopback addresses). The routing can be completed using either static routes.
Because "ip nhrp map multicast" command was used on the spoke routers they can only broadcast hellos to the hub router, so OSPF becomes a hub and spoke configuration. This means the hub router must become the DR and using the OSPF broadcast network type must be used.
It should look like this:
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