100 mbps connection at SLAC
Many users at SLAC connect to the network at
If a user requires a higher speed to 100Mbps/Full Duplex, and the networking infrastructure
allows it, the SCCS Networking Group will work with the user and his Desktop Adminsitrator to complete this upgrade.
How to request a 100 mbps connection
Determine if higher speed is necessary.
Contact your Desktop Administrator and request the higher speed.
A list of the administrator can be found
Your Desktop Administrator should:
verify that your network card can run at 100mbps (for Linux see note at the end of page);
gather the necessary information to perform the change:
Network Admin Request Ticket Form
- user's or contact name and phone number
- Desktop Administrator's name and phone number
- system name
- location: bldg, room, tap number
- justification for the higher speed connection
Note: In the space for Describe the issue below, provide the collected information and the justification for the speed change.
How to change the speed to 100mbps
The setting on your desktop can be changed only by somebody with administrative privileges and preferably should be done by the Desktop Administrator.
After the request has been approved it will be necessary to coordinate the two following actions:
the SCCS Network Group will change the network switch port to 100Mbps/Full Duplex or auto-negotiate.
your desktop NIC will be changed to 100Mbps/Full Duplex or auto-negotiate.
These changes need to happen at the SAME TIME to avoid loss of
connectivity or degraded network performance
the settings MUST MATCH i.e. the NIC and the switch port must both be set to 100/FULL or both set to auto-negotiate. They cannot be different.
Instruction on how to change the settings can be found
- If your NIC module is supported (see note below), do one the following:
- For NIC and switch port using 100Mbps/Full Duplex
add this line: 'ethernet=100mb' to /etc/taylor.opts
- For NIC and switch port using auto-negotiate
ensure that the above line is taken out
- Run 'sudo /afs/slac/package/taylor/prod/taylor everything'
Contact unix-admin to have the speed changed.
Note on Linux systems
The list of NIC modules supported for 100mbps speed can be obtained by
running the script on the system that you wish to upgrade to 100 mbps:
Contact unix-admin if the card is not in the supported list.
(Comments to: email@example.com)
Last modified: Tue October 9 14:52:00 PST 2008