From: Wayne Bellward (wbellward@gmail.com)
Date: Mon Apr 18 2005 - 06:58:39 GMT-3
HI All,
I tried all the suggestions so far with the same results, slow transfers and
high retransmissions.I changed the protocol, the switches, the IOS the only
thing left was the file I was transferring, suddenly success transfer speeds
of 1.1Mb on 10Mb half duplex. It looks like the binary file was probably
corrupt, it was something I should have eliminated a lot earlier, still a
valuable lesson to learn.
Wayne
On 4/14/05, Larry Roberts <groupstudy@american-hero.com> wrote:
>
> First off sorry for the delay in responding.
>
> I have been fighting a problem for several weeks with some 3550's that I
> couldn't get any decent throughput on. I was seeing massive retrans and
> duplicate packets. Cisco was at a loss as to the problem so we decided
> to do a code upgrade.
>
> The old code was c3550-i9q312-mz.121-19.EA1c.bin, and the switches had
> been up for a year and a half. I upgraded 3 switches, and just rebooted
> 3 others.
>
> We upgraded to c3550-i9q3l2-mz.122-25.SEA.bin.
>
> after the upgrade/reboot we went from 1 Mb/s transfer speeds to roughly
> 75Mb/s between 100Mb NIC's.
>
> Since the problem disappeared on the rebooted switches as well as the
> upgraded switches I think its fairly safe to say that the reboot fixed
> the problem.
>
> My problems existed inter-switch as well as intra-switch with 1Gb
> connections via a 3508.
>
> I would try a reboot on the switches to see if that helps any.
>
> Larry
>
>
> James Ventre wrote:
> > a few weeks ago I tested a 3550-48.
> >
> > c3550-i9q3l2-mz.121-19.EA1c.bin
> >
> > SmartBits hanging off each fiber interfaces (2 total) - trunking to the
> > SmartBits (on both interfaces). The 3550 was doing inter-vlan routing.
> > I was able to get 1Gbps (full duplex) without any packet loss for the
> > duration of the test which was 120 seconds.
> >
> > James
> >
> >
> >
> >
> >
> >
> > Wayne Bellward 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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> >
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