[sdnog] Common problem in sudan | Duplex mismatch

[Tarig Yassin]

Hi Bernd 

> 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.

how disappointing.. I didn't expect that, i thought it was vendor problem.

> the check of duplex errors should be part of each link check after turnup - and as things are changing you should
> also periodically check your interfaces on switches and routers ...

it seems this is the only way, but it can be through script, right?

thanks

> From: bernd.spiess at de-cix.net
> To: surfer at mauigateway.com; sdnog at sdnog.sd
> Date: Tue, 27 Jan 2015 21:11:24 +0000
> Subject: Re: [sdnog] Common problem in sudan | Duplex mismatch
> 
> Hi Scott 
> 
> 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.
> 
> the check of duplex errors should be part of each link check after turnup - and as things are changing you should
> also periodically check your interfaces on switches and routers ...
> 
> 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...
> 
> PS: keep up that great work - quite a perfect mailing list with very good discussions :-)
> 
> Bernd
> 
> Bernd Spiess
> Manager Peering Service
> DE-CIX Management GmbH | Lindleystrasse 12 | 60314 Frankfurt am Main | Germany 
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: sdnog-bounces at sdnog.sd [mailto:sdnog-bounces at sdnog.sd] Im Auftrag von Scott Weeks
> Gesendet: Dienstag, 27. Jänner 2015 21:35
> An: sdnog at sdnog.sd
> Betreff: Re: [sdnog] Common problem in sudan | Duplex mismatch
> 
> --- tariq198487 at hotmail.com wrote:
> 
> The most common problem I face when I check the links status in every network here in sudan that some links are *half* duplex. 
> 
>    Why? May be there is compatablity issue between Huawei and cisco. 
> 
>    What is the impact? Huge packet loss and very slow browsing experience. 
> 
>    How to solve it? I do not know, I just try randomly all posible settings in both routers cisco & Huawei till it get resolved. 
> 
> For discussion:
>  Do you have this problem in your network? Or have you faced it before.  Please help if you know the right settings for both routers.
> 
> Note: I am serious every network I checked it has this problem.
> --------------------------------------------------
> 
> 
> I have seen this on our network.  For example, I have seen 
> 100Mbps half-duplex be auto-negotiated between two devices
> from different manufacturers.  I go in and hard code them 
> when I find them.  I use a script to look through the nightly
> backups (I get the output from various commands as well as
> the configs) to find them.
> 
> In cisco's routers:
> 
> conf t
> 
> int f1/0/1
> speed 100
> duplex full
> 
> exit
> wr mem
> exit
> 
> 
> scott
> 
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