[c-nsp] OSPF dead timer problem

[Rodney Dunn]

Set up either an ACL inbound to match on the OSPF packets
and monitor them or either start a "debug ip packet"
debug against an ACL to match on hello's between the
two neighbors.

You can use this to identify direction of loss and
go from there.

On Wed, Mar 23, 2005 at 02:00:23PM -0800, Matt Bazan wrote:
> I'll reset the counters for the circuit and see if anything odd shows
> up.  CPU are running around 15% on both units.  Thanks.
> 
> > -----Original Message-----
> > From: Church, Chuck [mailto:cchurch at netcogov.com] 
> > Sent: Wednesday, March 23, 2005 1:58 PM
> > To: Matt Bazan; cisco-nsp at puck.nether.net
> > Subject: RE: [c-nsp] OSPF dead timer problem
> > 
> > 
> > Are you sure the circuit is running clean?  I've seen 
> > marginal T1s where there was enough packet loss to cause 
> > routing protocol drops, yet the interfaces always said 'up'.  
> > What does the CSU side of things tell you? You can always try 
> > a larger hello to dead interval ratio, like 1:5, 2:10, etc to 
> > see if that helps.  Are the CPUs running ok on both routers? 
> > 
> > 
> > Chuck Church
> > Lead Design Engineer
> > CCIE #8776, MCNE, MCSE
> > Netco Government Services - Design & Implementation Team
> > 1210 N. Parker Rd.
> > Greenville, SC 29609
> > Home office: 864-335-9473
> > Cell: 703-819-3495
> > cchurch at netcogov.com
> > PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D 
> > 
> > 
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net 
> > [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Matt Bazan
> > Sent: Wednesday, March 23, 2005 2:28 PM
> > To: cisco-nsp at puck.nether.net
> > Subject: [c-nsp] OSPF dead timer problem
> > 
> > Hello,
> > 	I'm no OSPF expert (by any stretch) and I'm seeing a 
> > strange anomaly between two of our 3640 routers.  What's 
> > happening is that the dead timer is expiring between on one 
> > of our T1 p2p links even though the circuit between the two 
> > routers is fine (everyting is up/up).  This is causing a 
> > brief (few seconds or so) loss of communication between the 
> > devices but not long enough to trigger an ospf re-convergence 
> > (if I have my terminology correct).  Ideas as to what is 
> > going on?  Thanks,
> > 
> >   Matt
> > 
> > 
> > _______________________________________________
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> > 
> > 
> 
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