[sdnog] Common problem in sudan | Duplex mismatch

[Tarig Yassin]

Hi Hiba

>We have run into the same issue, clearly auto- negotiation
> is not an option ;). Please give us more information about 
>the syslog setup.

yes, specially with Huawei case.

one thing I forgot to mention, people seem to *underestimate* this problem.....  i think SdNOG should have role on this.

thanks

Date: Wed, 28 Jan 2015 07:54:09 +0300
From: higba6 at gmail.com
To: surfer at mauigateway.com
CC: sdnog at sdnog.sd
Subject: Re: [sdnog] Common problem in sudan | Duplex mismatch

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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