SUMMARY : hme, cisco and auto-negotiate

From: Stephen Johnston (
Date: Wed Nov 29 2000 - 03:26:26 CST


Original question at bottom...

Most people said don't use auto-negotiation, it doesn't work.

Other responses;

Make sure if it's on, then it's on at only one end of the link
Make sure you have up to date patches on the Suns and Firmware in the Cat

We went with not using autonegotiation and this works fine. The necessary
additions to /etc/system are;

ndd -set /dev/hme instance 0 (could be 1,2,3,....)
ndd -set /dev/hme adv_autoneg_cap 0
ndd -set /dev/hme adv_100T4_cap 0
ndd -set /dev/hme adv_100fdx_cap 1 # full duplex for 100mbit
ndd -set /dev/hme adv_100hdx_cap 0 # 100mbit half duplex off
ndd -set /dev/hme adv_10fdx_cap 0 # 10mbit full duplex off
ndd -set /dev/hme adv_10hdx_cap 0 # 10mbit half duplex off

there are other commands you can put in here but these are the most common ones.

For info try the links below:

Thanks to all of those who responded this is obviously something many people
have had to deal with.



Original Question;

From: Stephen Johnston []
Sent: 28 November 2000 15:35
To: 'Sun Managers'
Subject: hme, cisco and auto-negotiate


Can someone point me to some clear documentation regarding the best setup

Solaris 2.6, hme NICs from a variety sun h/w to CISCO C5500 switches for
auto-negotiate (one end/both ends/not at all) for UTP links.

We are seeing some NFS/NIS drop-out when we configure, for example auto 100.

Basically I'd like to get to the bottom of what's best, as we've had
answers from various sources.

Sorry for the vague nature of the question :(

TIA, I will summarise.

Stephen Johnston                                  Phone: +49 89 32006322
UNIX Systems Manager                              Fax  : +49 89 32006380
European Southern Observatory
Karl-Schwarzschild-Strasse 2
D-85748 Garching bei Muenchen           
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