From: Larry Roberts (groupstudy@american-hero.com)
Date: Thu Apr 14 2005 - 12:24:09 GMT-3
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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