From: jbarratt (jbarratt@COMPSAT.COM)
Date: Wed Jan 14 2004 - 12:14:43 EST
Same problem on (gasp) marconi and (double gasp)intel(yes..they did sell
network gear)..
I have had some better luck with some of the unmanaged cheapo
switches(smc/etc) ..this is certainly not an endorsement for cheap
unmanaged switches
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of
cbaker@GOODYEAR.COM
Sent: Wednesday, January 14, 2004 11:48 AM
To: aix-l@Princeton.EDU
Subject: Re: What's wrong with autonegotiate
Importance: High
Folks,
Thanks for the overwhelming reply to this question.
Could the issue be that Cisco is not talking the "preferred" way? Seems
to be a common thread in most of the replies. I believe Cisco
10/100BaseT ports use a different negotiation method than Enterasys and
other PCI NIC cards (NWAY, I think).
Also, I am speaking of workstations, desktops, PC's, printers, etc. -
Not necessarily servers.
Does anyone have experience on non-Cisco equipment?
Christopher M. Baker
Senior Technical Support Analyst
DSE/TCO
Goodyear Tire and Rubber Company
=================================================
Contains Confidential and/or Proprietary Information.
May not be copied or disseminated without the expressed
written consent of The Goodyear Tire & Rubber Company.
=================================================
Thierry ITTY
<thierry.itty@BE To:
aix-l@Princeton.EDU
SANCON.ORG> cc: (bcc: Chris
Baker/NA/GDYR)
Sent by: IBM AIX Subject: Re: What's wrong
with autonegotiate
Discussion List
<aix-l@Princeton
.EDU>
01/14/2004 04:18
AM
Please respond
to IBM AIX
Discussion List
I consider that a autonegotiated connexion that works fine is just a
matter of luck
I had problems with many kind of OSes, NICs, switches.
the main problem with autonegotiation is that it never doesn't work. it
always works, but only at some percentage of the nominal throughput,
depending on the traffic profile. it may work fast in one way but very
slow in the other (ie upload vs download) or it may be fast with one
protocol and slow with another (ie telnet vs ftp). and so on. it may be
fine with one nic connected to one switch, then bad if you change the
switch.
I personnaly strongly advise to disable autonegotiation and setup fixed
duplexity and speed on all nics and all switch ports
A 15:17 13/01/2004 -0500, vous avez écrit :
>I have noticed lately that some still say in this site "DO NOT
>AUTONEGOTIATE your speed/duplex on IBM AIX boxes.
>
>We had major problems with that back in the early AIX 433 (or earlier)
days
>and back with the 43P-140 [7043-140] (and first cut of the 150's and
260's)
>and the first auto-negotiating ethernet cards.
>
>BUT, we were told that with the newer boxes (about the time when they
>went from beige to black cases) that the problem was fixed. It was NOT
>an OS issue but rather a NIC issue.
>
>In our case, we had (and still have) a lot of EnteraSys (Cabletron)
>switches. We were told that the "world" used one negotiation schema
>(i.e. Cabletron, HP, SUN, SGI), but IBM was using a different method in
>those ethernet cards. So, we saw that the NIC and the network hub/port
>were never coming to an agreement at what speed and duplex to use. So,
>we ticked off our Network group and made them lock down the ports to
100/Full.
>
>But, since then, (a couple years now at least) we have been setting
>both the NIC and the network port to autonegotiate and have had no
>problems.
>
This archive was generated by hypermail 2.1.7 : Wed Apr 09 2008 - 22:17:30 EDT