[nsp] dot1q causes port error?

[Temkin, David]

I'm positive it's actually a problem with dot1q on the 2924's.  110%
positive, because I had the same exact issue two weeks ago between a URM
(3660 on a card) and a 2924 in a remote office.

AFAIK, disabling keepalives doesn't actually make the problem go away - it
didn't for me.  The only fix that worked for me was converting the trunk to
ISL.  It seems pretty obvious from the fact that the counters are exactly
the same.

I should have looked at the bug before I sent it to you, because it's not
the same as what's happening here.

First of all, the 35xx series doesn't have the same limitation as the 2924.
 Give it a shot if you can... I'm not sure what kind of production
environment you run.




> -----Original Message-----
> From: Stephen J. Wilcox [mailto:steve@telecomplete.co.uk] 
> Sent: Monday, November 25, 2002 2:13 PM
> To: Temkin, David
> Cc: cisco-nsp@puck.nether.net
> Subject: RE: [nsp] dot1q causes port error?
> 
> 
> Hi David,
>  this is actually saying it is a problem in ISL and NOT in 
> dot1q, I have seen a similar reference and have disabled 
> keepalives. THis makes no difference tho, the errors are 
> there as before.
> 
> Steve
> 
> 
> On Mon, 25 Nov 2002, Temkin, David wrote:
> 
> > It's a known issue caused by keepalives.
> > 
> > See bug CSCdr22809
> > 
> > It's a hardware limitation on the switch.  The router sends 
> keepalives 
> > untagged and the switch can't deal with it.
> > 
> > Convert the trunk to ISL and they will go away.  I promise. :-)
> > 
> > -Dave
> > 
> > > -----Original Message-----
> > > From: Stephen J. Wilcox [mailto:steve@telecomplete.co.uk]
> > > Sent: Monday, November 25, 2002 2:00 PM
> > > To: cisco-nsp@puck.nether.net
> > > Subject: [nsp] dot1q causes port error?
> > > 
> > > 
> > > Hi,
> > > 
> > > I've a Cat2924-XL-EN (c2900XL-c3h2s-mz-120.5.2-XU.bin)
> > > connecting to a 7200 with IO-FE (c7200-js-mz.122-8.T5)
> > > 
> > > I'm running dot1q on them and seeing errors. I'm sure theres
> > > no cable fault and have replicated this with different 
> > > hardware. I'm unable to find anything in the bug toolkit 
> > > (which doesnt appear to support IOS for switches very well) 
> > > and google showed nothing useful either.
> > > 
> > > ANyone else seen this and perhaps knows the problem?
> > > 
> > > relevant counters (no others show error)
> > > 
> > > Switch:
> > >      Received 89 broadcasts, 1698991 runts, 0 giants, 0 throttles
> > >      1819995 input errors, 121004 CRC, 0 frame, 44 overrun,
> > > 132 ignored
> > > 
> > > Router:
> > >      16687740 packets output, 3005655898 bytes, 299991 underruns
> > >      299991 output errors, 0 collisions, 0 interface resets
> > > 
> > > Note the errors occur in the direction router to switch.
> > > 
> > > Also, pinging the switch or devices beyond the switch doesnt
> > > appear to produce any packet loss that ought to be associated 
> > > to errored frames
> > > 
> > > Any thoughts?
> > > 
> > > Steve
> > > 
> > > 
> > > _______________________________________________
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> > > 
> > 
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