OSPF Issues

[leedsit]

Hi,

Really stuck with this one.

I have an OSPF area, made up of Cisco, Nortel and Nokia devices. At 16:40 on Monday and 16:40 on Wednesday we had network connectivity issues for approx 6 minutes. After investigating I found....

All OSPF routes on all Cisco Routers age were 5 minutes old
All External routes ( from various ASBRs ) were 5 minutes old on Nokia and Nortels, Intra routes were fine. ( age 3 weeks )

No neighbourships were torn down/set back up
No Interfaces flapped or died... nothing in the logs!!!!
How can the OSPF routes change when "no link states" changed. Im starting to think bug as ive dismissed all other logical options.

Not sure now where to look for the issue.

Any advice from other buddies ospf`ers would be appreciated.

Lee.



LEEroy
MCNE6,CCNP,CWNA,CCSA,Project+

 

[burtsbees]

Do you ever look at the Bug Tool on CCO? It's a great tool...I would go there at this point...let me know if you need a link.
Did you see any interface resets increment past 1 on any OSPF interfaces?

Burt

 

[vipergg]

I think your only option is to peruse the logs on the attached devices for anything weird as something triggered the routing update whether it be a quick link flap or whatever .