Re: What's wrong with autonegotiate

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Date:         Tue, 13 Jan 2004 16:21:26 -0600
To: aix-l@Princeton.EDU

The systems I saw this on at my previous employer were Win2k File Servers, so the problems all revolved around slow response when opening, saving or copying files to/from the server.

-Patrick Lieberg
Systems Administrator
ev3 Inc.

-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On Behalf Of
Robert Miller
Sent: Tuesday, January 13, 2004 3:16 PM
To: aix-l@Princeton.EDU
Subject: Re: What's wrong with autonegotiate

I knew about the IBM/AIX problems, but I haven't so far seen any problems with our HPAQ(HP/Compaq) boxen...
What sorts of problems were you seeing, so I know what to look for?

Thanks...

--rm

-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On Behalf Of
Lieberg, Patrick
Sent: Tuesday, January 13, 2004 12:52 PM
To: aix-l@Princeton.EDU
Subject: Re: What's wrong with autonegotiate

This problem is not just in the IBM or AIX world. I've seen this problem between Cisco equipment and Compaq (now HP) hardware as well. I've made it SOP to never rely on Auto-Negotiate on any device, which means when people bring problems like this up, its one of the first things I suggest as a possible solution.

-Patrick Lieberg
Systems Administrator
ev3 Inc.

-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On Behalf Of
cbaker@GOODYEAR.COM
Sent: Tuesday, January 13, 2004 2:18 PM
To: aix-l@Princeton.EDU
Subject: What's wrong with autonegotiate
Importance: High

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.

Is there a new problem?

Christopher M. Baker
Senior Technical Support Analyst
DSE/TCO
Goodyear Tire and Rubber Company

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