[nsp] dot1q causes port error?
Temkin, David
temkin@sig.com
Mon, 25 Nov 2002 15:23:57 -0500
No. I've done it before (and done exactly what you'd be doing - used a 2924
to go between ISL and dot1q trunks...
-Dave
> -----Original Message-----
> From: Stephen J. Wilcox [mailto:steve@telecomplete.co.uk]
> Sent: Monday, November 25, 2002 2:20 PM
> To: Temkin, David
> Cc: cisco-nsp@puck.nether.net
> Subject: RE: [nsp] dot1q causes port error?
>
>
> Thanks David,
>
> there is non-cisco equipment connecting which is why we run
> dot1q. I guess we can run ISL on one port and dot1q on another.
>
> Do you know if this deencaps and reencaps process adds load
> or if this occurs anyway in the switching path between two
> trunk ports? I wouldnt like to do it if it compromises the
> efficiency of the switch.
>
> Steve
>
>
> On Mon, 25 Nov 2002, Temkin, David wrote:
>
> > 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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