WS-C3750X-24 OSPF problem

[jluis_alves]

Hi all,

I having a big issue with OSPF on a WS-C3750X-24T-L device. IOS version - 15.0(2)SE2

Randomly we lost OSPF routing.

Here is the log after the issue.

Some ideas about it?

Thanks in advance.

[Leo Laohoo]

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@jluis_alves wrote:

Neighbor 10.42.201.250, Interface Vlan1 state changes from FULL to DOWN reason Dead timer expired 

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I am seeing a lot of these. 

Check the logs of the switch and see if the LINK to the adjacent neighbor isn't flapping.

[Deepak Kumar]

Hi, 

It is looking as the connected link is continues flapping. Please check "show logging" if logging buffered is enabled. 

Regards,

Deepak Kumar

[Julio E. Moisa]

Hi,

How is your topology, the logs show the following info associated to vlan 1:

240 Apr 18 00:23:40.949: Interface Vlan1 state changes from DR to DR
241 Apr 18 00:23:40.949: Elect DR: Vlan1 10.42.201.254
242 Apr 18 00:23:40.949: Elect BDR: Vlan1 0.0.0.0
243 Apr 18 00:23:40.949: i/f state nbr chg: Vlan1 0x5
244 Apr 18 00:23:40.949: Neighbor 10.42.201.250, Interface Vlan1 state changes from 2WAY to EXSTART
245 Apr 18 00:23:40.949: nbr state adjok: 10.42.201.250 0x3
246 Apr 18 00:23:40.949: Interface Vlan1 state changes from DR to DR
247 Apr 18 00:23:40.949: Elect DR: Vlan1 10.42.201.254
248 Apr 18 00:23:40.949: Elect BDR: Vlan1 0.0.0.0
249 Apr 18 00:23:40.949: i/f state nbr chg: Vlan1 0x5
250 Apr 18 00:23:40.949: Neighbor 10.42.201.250, Interface Vlan1 state changes from INIT to 2WAY
251 Apr 18 00:23:40.949: Neighbor 10.42.201.250, Interface Vlan1 state changes from DOWN to INIT

Could you please share the configuration of these routers having this issue? and also verify the CPU utilization during this issue.

Thank you

[jluis_alves]

Hi all,I can't found any flapping interfaces on logs. 

This switch is direct connected to a Palo Alto Firewall using a port-channel.

This issue occur randomly. We can have this up for 4 days or for 8 hours.

On the Firewall logs we only see that the neighbor does down.

[Julio E. Moisa]

During this situation, you could execute a: debug ip ospf adj, it could display any key information. 

[Deepak Kumar]

Hi, 

Please check the port channel status. Is it really work as a port channel on both sites?

Regards,

Deepak Kumar

[Leo Laohoo]

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@jluis_alves wrote:

Hi all,I can't found any flapping interfaces on logs.  

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Check the interface-level configuration.  There are some people who likes to disable interface logging so the logs won't show if the ports go down/up.  The command is "no logging interface link".  If this line is present, take it off. 

Post the complete output to the command "sh interface <PHYSICAL PORT>" of the link.