[sdnog] Common problem in sudan | Duplex mismatch

[Hiba Eltigani]

Hello Scott
     We have run into the same issue, clearly auto- negotiation is not an
option ;). Please give us more information about the syslog setup.
BR
On Jan 28, 2015 1:11 AM, "Scott Weeks" <surfer at mauigateway.com> wrote:

> Hello Bernd,
>
> --- bernd.spiess at de-cix.net wrote:
> From: Bernd Spiess <bernd.spiess at de-cix.net>
>
> > good point ... in general there is no magic - the problem
> > is quite standard on 100 MBit interfaces when you don´t
> > define if you connect auto to auto or manual to manual -
> > if you try to mix auto negotiate with manual duplex you
> > have for sure this problem.
>
> In my case it was not auto on one side and hard coded
> on the other.  It was auto on both sides. And what was
> stranger (I have seen this more than once on this network)
> is no work was being done on either device.  For some
> reason, the two devices decided to re-negotiate and come up
> with silly decisions, such as 100/half.
>
>
>
> > last: if you have performance problems - as you said: you
> > can in many cases bet on a duplex problem in your network...
> > ... and this is also one of the reasons why your switches
> > should be in all cases manageable...
>
> One way to watch for this is have all devices send syslog
> messages to one central syslog server and then watch the
> logs on the server for anything unusual.  It allows you to
> look at your entire network from one screen.  If anyone's
> interested in how to make that happen let me know and I will
> elaborate.
>
>
>
> > PS: keep up that great work - quite a perfect mailing list
> > with very good discussions :-)
>
> Yes, I am looking forward to learning a lot from this new
> list! :-)
>
>
> scott
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