[nsp] dot1q causes port error?

[Temkin, David]

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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