From: Wayne Bellward (wbellward@gmail.com)
Date: Tue Apr 12 2005 - 11:55:14 GMT-3
Hi Dillon,
The aim of the scenario was to emulate a LES10 circuit, hence the 10Mb Full
Duplex. I have now spoken to a to a few people and it would seem as Chris
Larson points out tcp based file transfer is a poor way to measure
performance. Someone has recommended TTCP utility
www.pcausa.com/Utilitie<http://www.pcausa.com/Utilities/pcattcp.htm>
s/pcattcp.htm <http://www.pcausa.com/Utilities/pcattcp.htm> either way this
is a subject I'm going to have to do some reading up on. If anyone has any
recommendations I'd be glad to hear them.
Many Thanks
On Apr 12, 2005 2:51 PM, Dillon Yang <dillony@gmail.com> wrote:
> Hi, Wayne:
>
> I can not understand the "10Mb Full duplex crossover" on 3550! Maybe
> you used a wrong cabling that caused the speed down. You'd show the
> interface to know whether there is lost packets.
>
> HTH
> dillon
>
>
> On Apr 12, 2005 7:11 PM, Wayne Bellward <wbellward@gmail.com> wrote:
> > Hi All,
> >
> > I have two 3550EMI's connected via a 10Mb Full duplex crossover, the
> > link is a 802.1q trunk and I only have about four VLANS running. When
> > I do an FTP of a 10Mb binary file between two hosts one on each switch
> > in different VLANS I get file transfer speeds of about 50KBs. If I
> > put the hosts on the same 3550 I get transfer speeds of about 85KBs,
> > CEF is enabled but either way I would expect to get transfer speeds
> > much greater than those I am getting.
> >
> > The 3550 has a 8.8Gbps switch fabric and a throughput of 4.4Gbps can
> > anyone explain to me why this is happening? I don't think there is a
> > problem with the switches or the hosts but get the impression I am
> > missing a fundamental aspect of switching.
> >
> > Many Thanks,
> >
> > Wayne
> >
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