From: Ed Lui (edwlui@gmail.com)
Date: Tue Apr 12 2005 - 22:25:49 GMT-3
Wayne,
I vote for Chuck Church's opinion. <Look at all the duplex settings first>
Percentage of collision?
Thanks,
Ed Lui
On 4/12/05, Church, Chuck <cchurch@netcogov.com> wrote:
> Wayne,
>
> Your problem appears to be config or hardware related. 50 or 85
> kb/sec is absurdly slow. TCP isn't the problem, not with a RTT of well
> under 1ms between the hosts. I'd take a look at all the duplex settings
> first. TCP shouldn't have a problem on a LAN, until you get to
> gigabit-speed. HTH.
>
> Chuck Church
> Lead Design Engineer
> CCIE #8776, MCNE, MCSE
> Netco Government Services - Design & Implementation
> 1210 N. Parker Rd.
> Greenville, SC 29609
> Home office: 864-335-9473
> Cell: 703-819-3495
> cchurch@netcogov.com
> PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Wayne Bellward
> Sent: Tuesday, April 12, 2005 7:12 AM
> To: Cisco certification
> Subject: File Transfer Speeds
>
> 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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