PeraHoman
asked on
Stuck in INIT/DROTHER
Neighbor went down. Router log shows that the core switch's dead timer expired.
I checked:
Hello and dead timers are the same. 10, 40
No mismatch in network commands, areas, mask, or MTU
passive interface is not used on either side.
Router doesn't see core switch in 'sh ip ospf nei"
CORE
CSW001#sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
10.148.0.222 0 FULL/ - 804 msec 10.148.0.2 Vlan11
10.148.0.226 1 FULL/DR 00:00:32 10.148.0.34 GigabitEthernet2/48
10.148.0.225 1 INIT/DROTHER 00:00:33 10.148.0.26 GigabitEthernet2/47 Dead timer counts down and resets
interface GigabitEthernet2/48
description RTR
no switchport
ip address 10.148.0.33 255.255.255.252
no ip redirects
carrier-delay msec 0
speed 1000
duplex full
no cdp enable
end
CSW#sh ip ospf int bri
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Lo0 10 0 10.148.0.221/32 1 LOOP 0/0
Vl11 10 0 10.148.0.1/30 100 P2P 1/1
Gi2/48 10 30 10.148.0.33/30 1 BDR 1/1
Gi2/47 10 30 10.148.0.25/30 1 DR 0/1
Vl311 10 100 10.148.32.18/28 1 DR 0/0
Vl30 10 100 10.148.32.50/28 1 DR 0/0
Vl32 10 100 10.148.32.34/29 1 DR 0/0
Vl7 10 100 57.23.226.253/24 1 DR 0/0
Te1/3 10 100 10.148.0.13/30 1 P2P 1/1
Te1/2 10 100 10.148.0.5/30 1 P2P 1/1
Te3/5 10 101 10.148.0.54/30 1 P2P 1/1
ROUTER
ROUTER#sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
10.148.0.222 1 FULL/BDR 00:00:32 10.148.0.29 GigabitEthernet0/3
interface GigabitEthernet0/2
description CSW1
ip address 10.148.0.26 255.255.255.252
no ip redirects
no ip proxy-arp
ip flow ingress
ip route-cache flow
duplex full
speed 1000
media-type rj45
no negotiation auto
no cdp enable
end
ROUTER#sh ip ospf int bri
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Lo0 11111 30 10.148.0.225/32 1 LOOP 0/0
Gi0/3 11111 30 10.148.0.30/30 1 DR 1/1
Gi0/2 11111 30 10.148.0.26/30 1 DR 0/0
I checked:
Hello and dead timers are the same. 10, 40
No mismatch in network commands, areas, mask, or MTU
passive interface is not used on either side.
Router doesn't see core switch in 'sh ip ospf nei"
CORE
CSW001#sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
10.148.0.222 0 FULL/ - 804 msec 10.148.0.2 Vlan11
10.148.0.226 1 FULL/DR 00:00:32 10.148.0.34 GigabitEthernet2/48
10.148.0.225 1 INIT/DROTHER 00:00:33 10.148.0.26 GigabitEthernet2/47 Dead timer counts down and resets
interface GigabitEthernet2/48
description RTR
no switchport
ip address 10.148.0.33 255.255.255.252
no ip redirects
carrier-delay msec 0
speed 1000
duplex full
no cdp enable
end
CSW#sh ip ospf int bri
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Lo0 10 0 10.148.0.221/32 1 LOOP 0/0
Vl11 10 0 10.148.0.1/30 100 P2P 1/1
Gi2/48 10 30 10.148.0.33/30 1 BDR 1/1
Gi2/47 10 30 10.148.0.25/30 1 DR 0/1
Vl311 10 100 10.148.32.18/28 1 DR 0/0
Vl30 10 100 10.148.32.50/28 1 DR 0/0
Vl32 10 100 10.148.32.34/29 1 DR 0/0
Vl7 10 100 57.23.226.253/24 1 DR 0/0
Te1/3 10 100 10.148.0.13/30 1 P2P 1/1
Te1/2 10 100 10.148.0.5/30 1 P2P 1/1
Te3/5 10 101 10.148.0.54/30 1 P2P 1/1
ROUTER
ROUTER#sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
10.148.0.222 1 FULL/BDR 00:00:32 10.148.0.29 GigabitEthernet0/3
interface GigabitEthernet0/2
description CSW1
ip address 10.148.0.26 255.255.255.252
no ip redirects
no ip proxy-arp
ip flow ingress
ip route-cache flow
duplex full
speed 1000
media-type rj45
no negotiation auto
no cdp enable
end
ROUTER#sh ip ospf int bri
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Lo0 11111 30 10.148.0.225/32 1 LOOP 0/0
Gi0/3 11111 30 10.148.0.30/30 1 DR 1/1
Gi0/2 11111 30 10.148.0.26/30 1 DR 0/0
ASKER CERTIFIED SOLUTION
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The troubleshooting steps from the link below will walk you through different scenarios. Focus on the section that refers to Init/DRother issues
https://networklessons.com/ospf/troubleshooting-ospf-neighbor-adjacency/