[sdnog] Common problem in sudan | Duplex mismatch

[Tarig Yassin]

Hi Scott

> 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.


for sure I am interested.

thanks

> Date: Tue, 27 Jan 2015 14:10:40 -0800
> From: surfer at mauigateway.com
> To: sdnog at sdnog.sd
> Subject: Re: [sdnog] Common problem in sudan | Duplex mismatch
> 
> 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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