Odd OSPF problems

RouterOS Forwarding Protocols
1

I have an email in with support regarding this. We are seeing very odd OSPF (?) related problems between two of our routers. One is a 1100AH running 5.18, and one is a 450G running 5.14. They are connected via UBNT M5’s in WDS mode.

  • The two routers have an established OSPF broadcast session between them.
  • Several times per day, R1 reports that it’s ethernet link goes physically down.
  • The OSPF neighbor goes down
  • The ethernet link comes back up, but only at 10M/full
  • The ethernet link goes back down
  • The ethernet link comes back up, this time at 100M/full
  • OSPF reports “state change from Exchange to 2-Way” 4-6 times
  • OSPF then reports “wrong peer state, state=ExStart”

The only way to get the OSPF session to re-establish is to physically reboot the radio on one end. EVERYTHING on these towers has been replaced - routers, all cabling, UBNT radios, etc. This continues to happen on this one link.

This may not be OSPF related, but at this point, I’m looking for any advice.

Thanks.

2

you are a victim of the port-flapping issue.

have you tried to upgrade the routerboot?
/sys routerboard upgrade

this fixed the port flapping for me in one case.

3

No, I haven’t, but I will!

Thanks,

Josh

4

Support told me this was normal for auto-negotiation.. I think not. Anyhow, I upgraded the firmware this morning, so we’ll see how it works.

Josh

5

This RB ran all weekend with no problems. Thanks again!

6

http://forum.mikrotik.com/t/database-description-packet-has-different-master-status-flag/30658/1