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DMVPN - Spoke to spoke direct tunnel

For some reason, my spoke to spoke tunnel doesn't stay up when my hub goes down. Not sure what I am missing. Please help!!

 

Hub:

interface Tunnel0
 ip address 172.16.1.1 255.255.255.0
 no ip redirects
 no ip next-hop-self eigrp 10
 no ip split-horizon eigrp 10
 ip nhrp authentication _GW_
 ip nhrp map multicast dynamic
 ip nhrp network-id 1
 no ip split-horizon
 ip summary-address eigrp 10 10.1.0.0 255.255.0.0
 tunnel source 1.1.1.1
 tunnel mode gre multipoint
 tunnel protection ipsec profile dmvpn
end


spoke 1: 

interface Tunnel0
 ip address 172.16.1.7 255.255.255.0
 no ip redirects
 no ip split-horizon eigrp 10
 ip nhrp authentication _GW_
 ip nhrp map multicast dynamic
 ip nhrp map 172.16.1.1 1.1.1
 ip nhrp map multicast 1.1.1.1
 ip nhrp network-id 1
 ip nhrp nhs 172.16.1.1
 ip summary-address eigrp 10 10.7.0.0 255.255.0.0
 tunnel source GigabitEthernet0/0
 tunnel mode gre multipoint
 tunnel protection ipsec profile dmvpn
end

Spoke 2:

interface Tunnel0
 ip address 172.16.1.6 255.255.255.0
 no ip redirects
 no ip split-horizon eigrp 10
 ip nhrp authentication _GW_
 ip nhrp map multicast dynamic
 ip nhrp map 172.16.1.1 1.1.1.1
 ip nhrp map multicast 1.1.1.1
 ip nhrp network-id 1
 ip nhrp nhs 172.16.1.1
 ip summary-address eigrp 10 10.6.0.0 255.255.0.0
 tunnel source GigabitEthernet0/0
 tunnel mode gre multipoint
 tunnel protection ipsec profile dmvpn
end

 

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