[sdnog] Common problem in sudan | Duplex mismatch

Scott Weeks surfer at mauigateway.com
Tue Jan 27 22:35:04 SAST 2015

--- 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

wr mem


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