I have configured GRE tunnel between all routers to each other router except those in the same network (sales 1 to sales 2 for example). I have also configured all interfaces for OSPF in all routers and did DR/BDR election with making the 1st router of each segment the DR. However, OSPF forms neighborship between Sales 2 and Main 2/Admin 2 and Main 2. Admin 2 and Sales 2 do not form a neighborship also. I have also segregated the ospf into 3 different areas being,
Area 0
Tunnel 1, Tunnel 2, Tunnel 5, Tunnel 6
Area 1
Tunnel 3, Tunnel 4, Tunnel 7, Tunnel 8
Area 2
Tunnel 9, Tunnel 11, Tunnel 10, Tunnel 12
I do not understand why this is happening
I have attached the configs
MainRouter1#sh run | section ospf
ip ospf priority 200
ip ospf priority 200
router ospf 50
router-id 1.1.1.1
log-adjacency-changes
redistribute static subnets
network 172.16.1.192 0.0.0.3 area 0
network 172.16.1.196 0.0.0.3 area 0
network 172.16.1.200 0.0.0.3 area 1
network 172.16.1.204 0.0.0.3 area 1
MainRouter1#sh run | section ospf
ip ospf priority 200
ip ospf priority 200
router ospf 50
router-id 1.1.1.1
log-adjacency-changes
redistribute static subnets
network 172.16.1.192 0.0.0.3 area 0
network 172.16.1.196 0.0.0.3 area 0
network 172.16.1.200 0.0.0.3 area 1
network 172.16.1.204 0.0.0.3 area 1
MainRouter2#show run | section ospf
router ospf 50
router-id 2.2.2.2
log-adjacency-changes
redistribute static subnets
network 172.16.1.208 0.0.0.3 area 0
network 172.16.1.212 0.0.0.3 area 0
network 172.16.1.216 0.0.0.3 area 1
network 172.16.1.220 0.0.0.3 area 1
MainRouter2#show run | section interface
interface Tunnel5
ip address 172.16.1.209 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.18
interface Tunnel6
ip address 172.16.1.213 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.19
interface Tunnel7
ip address 172.16.1.217 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.34
interface Tunnel8
ip address 172.16.1.221 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.35
interface GigabitEthernet0/0
ip address 172.16.1.179 255.255.255.248
duplex auto
speed auto
standby version 2
standby 1 ip 172.16.1.177
standby 1 preempt
interface GigabitEthernet0/1
ip address 172.16.1.188 255.255.255.248
duplex auto
speed auto
standby version 2
standby 2 ip 172.16.1.185
standby 2 priority 110
standby 2 preempt
interface GigabitEthernet0/0/0
ip address 200.200.100.6 255.255.255.240
interface FastEthernet0/1/0
switchport mode access
switchport nonegotiate
interface FastEthernet0/1/1
switchport mode access
switchport nonegotiate
interface FastEthernet0/1/2
switchport mode access
switchport nonegotiate
interface FastEthernet0/1/3
switchport mode access
switchport nonegotiate
interface Vlan1
no ip address
shutdown
AdminRouter1#show run | section ospf
ip ospf priority 200
router ospf 50
router-id 5.5.5.5
log-adjacency-changes
redistribute static subnets
network 172.16.1.200 0.0.0.3 area 1
network 172.16.1.216 0.0.0.3 area 1
network 172.16.1.96 0.0.0.31 area 1
network 172.16.1.224 0.0.0.3 area 2
network 172.16.1.232 0.0.0.3 area 2
AdminRouter1#show run | section interface
interface Loopback1
ip address 172.16.1.197 255.255.255.248
interface Tunnel3
ip address 172.16.1.202 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.5
interface Tunnel7
ip address 172.16.1.218 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.6
interface Tunnel9
ip address 172.16.1.226 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.18
interface Tunnel11
ip address 172.16.1.234 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.19
interface GigabitEthernet0/0
ip address 172.16.1.98 255.255.255.224
ip ospf priority 200
duplex auto
speed auto
standby version 2
standby 1 ip 172.16.1.97
standby 1 preempt
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
shutdown
interface GigabitEthernet0/0/0
ip address 200.200.100.34 255.255.255.240
interface Vlan1
no ip address
shutdown
AdminRouter2#show run | section ospf
router ospf 50
router-id 6.6.6.6
log-adjacency-changes
network 172.16.1.204 0.0.0.3 area 1
network 172.16.1.220 0.0.0.3 area 1
network 172.16.1.96 0.0.0.31 area 1
network 172.16.1.228 0.0.0.3 area 2
network 172.16.1.236 0.0.0.3 area 2
AdminRouter2#show run | section interface
interface Loopback1
ip address 172.16.1.178 255.255.255.248
interface Tunnel4
ip address 172.16.1.206 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.5
interface Tunnel8
ip address 172.16.1.222 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.6
interface Tunnel10
ip address 172.16.1.230 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.18
interface Tunnel12
ip address 172.16.1.238 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.19
interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
shutdown
interface GigabitEthernet0/1
ip address 172.16.1.99 255.255.255.224
duplex auto
speed auto
standby version 2
standby 1 ip 172.16.1.97
standby 1 priority 110
standby 1 preempt
interface GigabitEthernet0/0/0
ip address 200.200.100.35 255.255.255.240
interface Serial0/1/0
no ip address
clock rate 2000000
shutdown
interface Serial0/1/1
no ip address
clock rate 2000000
shutdown
interface Vlan1
no ip address
shutdown
SalesRouter1#show run | section ospf
ip ospf priority 200
router ospf 50
router-id 3.3.3.3
log-adjacency-changes
network 172.16.1.192 0.0.0.3 area 0
network 172.16.1.208 0.0.0.3 area 0
network 172.16.1.128 0.0.0.15 area 0
network 172.16.1.224 0.0.0.3 area 2
network 172.16.1.228 0.0.0.3 area 2
SalesRouter1#show run | section interface
interface Tunnel1
ip address 172.16.1.194 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.5
interface Tunnel5
ip address 172.16.1.210 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.6
interface Tunnel9
ip address 172.16.1.225 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.34
interface Tunnel10
ip address 172.16.1.229 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.35
interface GigabitEthernet0/0
ip address 172.16.1.130 255.255.255.240
ip ospf priority 200
duplex auto
speed auto
standby version 2
standby 1 ip 172.16.1.129
standby 1 priority 110
standby 1 preempt
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
shutdown
interface GigabitEthernet0/0/0
ip address 200.200.100.18 255.255.255.240
interface Vlan1
no ip address
shutdown
SalesRouter2#show run | section ospf
router ospf 50
router-id 4.4.4.4
log-adjacency-changes
network 172.16.1.196 0.0.0.3 area 0
network 172.16.1.212 0.0.0.3 area 0
network 172.16.1.128 0.0.0.15 area 0
network 172.16.1.232 0.0.0.3 area 2
network 172.16.1.236 0.0.0.3 area 2
SalesRouter2#show run | section interface
interface Tunnel2
ip address 172.16.1.198 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.5
interface Tunnel6
ip address 172.16.1.214 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.6
interface Tunnel11
ip address 172.16.1.233 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.2
interface Tunnel12
ip address 172.16.1.237 255.255.255.252
mtu 1476
tunnel source GigabitEthernet0/0/0
tunnel destination 200.200.100.3
interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
shutdown
interface GigabitEthernet0/1
ip address 172.16.1.131 255.255.255.240
duplex auto
speed auto
standby version 2
standby 1 ip 172.16.1.129
interface GigabitEthernet0/0/0
ip address 200.200.100.19 255.255.255.240
interface Vlan1
no ip address
shutdown
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