This is a closed network running DMVPN phase 2/3 with two hub routers/sites and multiple (100+) spoke sites. The issue the network is having is a couple of spoke sites fail to connect to a couple of other spoke sites but are able to connect to a majority of the spoke sites.
What would cause this issue? I have compared the configurations, compared ip nhrp detailed on the spoke routers and the hub routers.
For some conversation clarity I will number the spoke routers
The sho DMVPN command on the spoke routers in question showed that Spoke-1 router displayed a DX in the: Attrb field and the other spoke-2 did not have an entry for spoke-1 in the DMVPN table or the nhrp table.
The hub routers sho DMVPN and ip nhrp detailed output both sho all of the spoke routers information correctly.
I hope this is enough to enable some conversation that will lead to a resolution for this spoke to spoke issue.
Thanks
bymc