OSPF flapping issue with Cisco 4500 Switches

[vinayak2010]

Hi All,

We are having Cisco 4500 switch running on (cat4500e-UNIVERSALK9-M), Version 03.04.00.SG RELEASE SOFTWARE (fc3) with ROM: 15.0(1r)SG7.

Recently we  were having issue with WAN links flap (OSPF neighbor) , The WAN links connected on Gig ports & found nothing wrong on those ports or nothing at WAN provider end.

After reloading switch all come back to normal. but again after a week same issue reoccurred.

is there any Bug causing this weird behavior ?

[Nagendra Kumar Nainar]

Are you seeing WAN link flap (and so OSPF flap) or just OSPF flap while WAN link stays up?.

[vinayak2010]

Hi Kumar,

WAN link flaps are there. The switch interface where WAN links connected goes up/down repetitively.

[sbhadrav@cisco.com]

Look  at the TSHOOT section in this doc for OSPF , debug ip ospf monitor may help you pinpoint the issue

https://www.cisco.com/networkers/nw00/pres/2206_7-5.pdf