topic full/half duplex ? in Operating System - HP-UX

full/half duplex ?

Greg OBarr — Wed, 25 Apr 2001 15:53:05 GMT

Anyone know of a command to tell if the LAN card is running at full or half duplex? I'm running an L2000 with 100BT cards. I can use lanadmin to tell that I'm running at 100mb/s, but don't see duplex shown.

Re: full/half duplex ?

James R. Ferguson — Wed, 25 Apr 2001 16:01:29 GMT

Hi Greg:

# lanadmin -x

...JRF...

Re: full/half duplex ?

Patrick Wallek — Wed, 25 Apr 2001 16:01:35 GMT

When using lanadmin -> lan -> display, the first line of the output is a Description line. This will tell you what duplex you are running.

From a C200 workstation:
Description = lan0 Hewlett-Packard 10/100 TX Half-Duplex

From a J5000 workstation:
Description = lan0 Hewlett-Packard 10/100 TX Full-Duplex

Re: full/half duplex ?

Greg OBarr — Wed, 25 Apr 2001 16:10:33 GMT

Thanks guys, I see it now. How about a way to force full duplex (i.e. turn off auto-negotiation?)

Re: full/half duplex ?

Patrick Wallek — Wed, 25 Apr 2001 16:19:49 GMT

Check the file /etc/rc.config.d/hp????base100conf configuration file. In this file you should see a line similar to:

HP_BASE100_SPEED[0]=100FD --> which means 100 Full Duplex

or if it is like my K460 then the line may just specify the duplex like:

HP_BASET_DUPLEX[0]=FULL

It should be something similar to one of those.

Re: full/half duplex ?

Peter Van Sant — Wed, 25 Apr 2001 18:13:48 GMT

Greg,

As you've already discovered lanadmin -x
(11.X) or (10.X) will display the current speed and duplex values. You can set
them permanently in the configuration scripts
in /etc/rc.config.d. One problem people sometimes have is figuring out which is the correct script. You L class system supports
three different versions of 100bt cards with
3 different scripts.

Use ioscan(1m) to find out which you have;

"ioscan -fnkC lan" will list all lan cards.
Look at the "driver" column to determine the
correct script;

driver script

btlan hpbtlanconf
btlan3 hpbase100conf
btlan5 hppci100conf

Remember that these only take effect when
you boot the system so if you want to set
them immediately without a reboot you use
lanadmin(1m), for instance

lanadmin -X 100fd 0

will set lan0 to 100mb/s full duplex on an
11.00 system.

Getting back to the scripts for a minute, as
Patrick pointed out you could see a line with
either "SPEED" or "DUPLEX". Hopefully you'll
see "SPEED", if not that means you have no
driver patch, an old driver patch, or have
patched but have not moved the updated configuration script from;

/usr/newconfig/etc/rc.config.d

to

/etc/rc.config.d

Hope this helps.