Weird networking issue.

Tue Jan 7 22:22:26 UTC 2003

I think we all agree that autonegotiation is evil, and should be avoided
whenever possible.  When you are looking for the root cause of the errors on
your 3660, look at the speed and duplex settings for each device connecting
to the etherstack hub.  If one of those is miss-configured or possibly has a
failing NIC, bad packets will be transmitted out all ports on the hub and
will show up in the "show int f0/0" output on your router.  

Mike Braun

-----Original Message-----
From: Peter E. Fry [mailto:pfry at swbell.net]
Sent: Tuesday, January 07, 2003 1:18 PM
To: nanog at merit.edu
Subject: Re: Weird networking issue.

"David G. Andersen" wrote:
> 
> Rule number 1 with any ethernet:  Check to make sure you have the duplex
> and rate statically configured, and configured identically on both ends of
> the connection. [...]

  I'd like to thank Cisco for this piece of advice, as the only company
incapable of manufacturing Ethernet equipment capable of
autonegotiation.  At least until 1999 or so.
  Yeah, there're a few others, all of which seemed to follow Cisco's
lead.  Nutty.

Peter E. Fry

"MMS <firstam.com>" made the following
 annotations on 01/07/03 14:22:30
------------------------------------------------------------------------------
"THIS E-MAIL MESSAGE AND ANY FILES TRANSMITTED HEREWITH, ARE INTENDED SOLELY FOR THE USE OF THE INDIVIDUAL(S) ADDRESSED AND MAY CONTAIN CONFIDENTIAL, PROPRIETARY OR PRIVILEGED INFORMATION.  IF YOU ARE NOT THE ADDRESSEE INDICATED IN THIS MESSAGE (OR RESPONSIBLE FOR DELIVERY OF THIS MESSAGE TO SUCH PERSON) YOU MAY NOT REVIEW, USE, DISCLOSE OR DISTRIBUTE THIS MESSAGE OR ANY FILES TRANSMITTED HEREWITH.  IF YOU RECEIVE THIS MESSAGE IN ERROR, PLEASE CONTACT THE SENDER BY REPLY E-MAIL AND DELETE THIS MESSAGE AND ALL COPIES OF IT FROM YOUR SYSTEM."

==============================================================================