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
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AkinsdNetwork AdministratorCommented:
Can you ping the loopback address from the router?

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/
JustInCaseCommented:
interface GigabitEthernet2/48
 description RTR
 ip address 10.148.0.33 255.255.255.252
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
Wrong interface attached and IP address ranges do not match?
interface GigabitEthernet0/2
 description CSW1
 ip address 10.148.0.26 255.255.255.252

Otherwise debug ospf adj on both devices.
# debug ip ospf adj

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