Re: [nsp] Deferred Packets

From: dhudson (dhudson@pilot.net)
Date: Thu Dec 14 2000 - 13:55:39 EST


A Routerman wrote:
>
> Normal? Even at low traffic rates of less than 1MB on a 10MB circuit? I would expect collisions certainly but don't understand why packets would be deferred (i.e how is the circuit that busy that packets have to be deferred given our traffic load). Over the course of 1 week we have over 70,000 deferred packets - seems high in relation to traffic (over 1% of total traffic).
>
> Thoughts?
>
> -----Original Message-----
> From: Basil Dolmatov dol@office.east.ru
> Sent: Thu, 14 Dec 2000 20:25:37 +0300
> To: routerman@briefcase.com, cisco-nsp@puck.nether.net
> Subject: RE: [nsp] Deferred Packets
>
> "Deferred" packets are absolutely normal at _any_ half-duplex links.
>
> -----------------------------------------------------
> Basil (Vasily) V. Dolmatov CCIE# 5347
> LightCom Corp. http://www.lightcom.ru
>
> > -----Original Message-----
> > From: routerman@visto.com [mailto:routerman@visto.com]On Behalf
> > Of A Routerman
> > Sent: Thursday, December 14, 2000 7:42 PM
> > To: cisco-nsp@puck.nether.net
> > Subject: [nsp] Deferred Packets
> >
> >
> > I have an issue that is causing too much hair loss :)
> >
> > We have a two 3640's connected to two Foundry switch/routers.
> > Then behind our 3640's we have two 2924xl switches that have a
> > connection to each 3640 (and the siwtches are trnked). We run
> > HSRP between the routers on the back end.
> >
> > The issue we see is on the front end between the 3640's and the
> > Foundry's. It is a 10 half duplex connection and we are seeing
> > about 1% of total traffic as deferred packets on the Cisco's. No
> > errors on the Foundry's. The link is only utilized at about 8%
> > (less than 1MB).
> >
> > Trying to determine why we are getting deferred packets and what
> > could be causing them. Some say it is "normal" to have deferred
> > packets on a 10 half (as well as collisions of course). Others
> > say it is a problem in that the Cisco is trying to send packets
> > and senses the network is busy so defers the packets.....
> >
> > Anyone else seen this? Normal? Causes of deferred packets are?
> >
> > Thanks in advance
> > __________________________________________________________________
> > _________
> > Visit http://www.visto.com/info, your free web-based
> > communications center.
> > Visto.com. Life on the Dot.
> >
>
> ___________________________________________________________________________
> Visit http://www.visto.com/info, your free web-based communications center.
> Visto.com. Life on the Dot.

check the segment connected to it.
it may be the culprit causing the defers.

-- 

del hudson sr. network engineer pilot network services piranha@fw.greatcirle.org

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My Lord Tzu, running away is the first martial tao

Sifu Yuen - archery master to Sun Tzu

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