I have a DMVPN setup with two hubs, primary and secondary and about 20 remote sites.
At present all sites are able to build a tunnel to the primary site and learn routes (EIGRP).
However this is only working on the secondary for one of these 20 sites and we cannot see why.
All of the others the tunnel comes up, goes idle, then another tunnel will build to the same addressing, then it will go into no state.
I have tried various debugs but nothing has come up.
The only difference between the single remote site which works and the others is it is on 12.4(6)T7, not 12.4(9)T7 like all others.
The config extract of the working hub is..
interface Tunnel1
description Primary Multi-Point GRE Tunnel For Remote Sites
bandwidth 10000
ip address 192.168.111.1 255.255.255.0
no ip redirects
no ip next-hop-self eigrp 206
ip nhrp authentication pQHtmoKO
ip nhrp map multicast dynamic
ip nhrp network-id 9371
ip nhrp holdtime 600
ip nhrp cache non-authoritative
no ip split-horizon eigrp 206
delay 1000
tunnel source 192.168.206.251
tunnel mode gre multipoint
tunnel key XXXX
tunnel protection ipsec profile dmvpn
!
The secondary hub is..
interface Tunnel2
description Secondary Multi-Point GRE Tunnel For Remote Sites
bandwidth 10000
ip address 192.168.112.1 255.255.255.0
no ip redirects
no ip next-hop-self eigrp 206
ip nhrp authentication pQHtmoKO
ip nhrp map multicast dynamic
ip nhrp network-id 9372
ip nhrp holdtime 600
ip nhrp cache non-authoritative
no ip split-horizon eigrp 206
delay 5000
tunnel source 192.168.206.252
tunnel mode gre multipoint
tunnel key XXXX
tunnel protection ipsec profile dmvpn
The remote sites all have the same and are set at..
interface Tunnel1
description Primary mGRE tunnel to THM Cisco 2801
ip address 192.168.111.137 255.255.255.0
no ip redirects
no ip next-hop-self eigrp 206
ip nhrp authentication pQHtmoKO
ip nhrp map 192.168.111.1 XXXX
ip nhrp map multicast XXXX
ip nhrp network-id 9371
ip nhrp holdtime 600
ip nhrp nhs 192.168.111.1
ip tcp adjust-mss 1300
no ip split-horizon eigrp 206
delay 1000
tunnel source XXXX
tunnel mode gre multipoint
tunnel key XXXX
tunnel protection ipsec profile dmvpn
!
interface Tunnel2
description Secondary mGRE tunnel to TC Cisco 2801
ip address 192.168.112.137 255.255.255.0
no ip redirects
no ip next-hop-self eigrp 206
ip nhrp authentication pQHtmoKO
ip nhrp map 192.168.112.1 XXXX
ip nhrp map multicast XXXX
ip nhrp network-id 9372
ip nhrp holdtime 600
ip nhrp nhs 192.168.112.1
ip tcp adjust-mss 1300
no ip split-horizon eigrp 206
delay 5000
tunnel source XXXX
tunnel mode gre multipoint
tunnel key XXXX
tunnel protection ipsec profile dmvpn
Any ideas?
