[c-nsp] OSPFv3 down every 34 minutes

[Mike Louis]

What type of link is this running? NBMA or PTP? Are you using authentication on the link?

________________________________________
From: cisco-nsp-bounces at puck.nether.net [cisco-nsp-bounces at puck.nether.net] On Behalf Of Mike Louis [MLouis at nwnit.com]
Sent: Sunday, April 13, 2008 7:54 PM
To: Brad Henshaw; Ben Steele; Eric Van Tol
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] OSPFv3 down every 34 minutes

>From what I recall, OSPF does a periodic sanity check every 30 minutes where it flushes its SPF table or something like that. Could this timing be related to something during that process? Wild guess, but I have seen issues with bouncing EIGRP adjacencies that were related to MTU sizes being set incorrectly on Gigabit and 10/100 interfaces facing each other. The problem only occurred when certain packets with DF bit were set.

Just a thought. Like I said , wild guess.



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Brad Henshaw
Sent: Sunday, April 13, 2008 7:23 PM
To: Ben Steele; Eric Van Tol
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] OSPFv3 down every 34 minutes

Ben Steele wrote:

> might also be worth setting up an ip sla probe

Definitely. Since it happens fairly predictably, you should also be
able to set the load-interval to 30 on the interfaces connecting to
those neighbours and check if there's a momentary increase of traffic
on those interfaces when the problem occurs.

Can you route around the problem while you troublshoot? (maybe force
a high ip ospf cost on the L3 interfaces)

Regards,
Brad
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