[c-nsp] Runts

[Wojtek Zlobicki]

Have you verified cabling ?  Runts and CRCs can be caused by a faulty
cable.  Second, take a detailed look at the Cisco port counters, there
is a chance that you are indeed seeing runts [sub 64 byte frames].  I
would also suggest that you try various duplex combos [Extreme Full,
Cisco Auto / Auto/Auto].  I have seen all sort of garbage categorized
as a runt when in reality, it did not exist.

On 7/19/05, Net Guru <net.guru.india at gmail.com> wrote:
> 
> Hi! Jay,
>             Thanks for ur response. But already I checked for duplex and speed. Both side its 100 full. Also the interface is not showing any other errors.
> 
> Regards,
> NG
> 
>   ----- Original Message -----
>   From: Jay Hennigan
>   To: Net Guru
>   Cc: Cisco Mailing List
>   Sent: Tuesday, July 19, 2005 11:52 AM
>   Subject: Re: [c-nsp] Runts
> 
> 
>   On Tue, 19 Jul 2005, Net Guru wrote:
> 
>   > Hi!
>   >         I have a Cisco 3750ME & Extreme Summit 48Si connected back to back over a trunk port. I am observing runts in Cisco side switch port, thus its increasing the input errors and effectively bringing down my switchport interface reliability. (Note - There is no packet loss due to this, from devices connected to cisco switch I am able to ping smoothly to the devices connected to Summit switch.) Where as in the Summit side I am not seeing any errors at all. Is there any way that we can find out the source of runts.
> 
>   Check for a duplex mismatch.  If the Extreme is half-duplex and the
>   Cisco full, the Extreme will stop transmitting when it sees traffic
>   from the Cisco resulting in a runt on the Cisco side.
> 
>   --
>   Jay Hennigan - CCIE #7880 - Network Administration - jay at west.net
>   WestNet:  Connecting you to the planet.  805 884-6323      WB6RDV
>   NetLojix Communications, Inc.  -  http://www.netlojix.com/
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-- 
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wojtek.zlobicki at gmail.com