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10-13
Catalyst 2960 Switch Software Configuration Guide
78-16881-01
Chapter 10 Configuring Interface Characteristics
Configuring Ethernet Interfaces
The switch does not have this behavior with 100BASE-FX-GE SFP modules.
Setting the Interface Speed and Duplex Parameters
Beginning in privileged EXEC mode, follow these steps to set the speed and duplex mode for a physical
interface:
Use the no speed and no duplex interface configuration commands to return the interface to the default
speed and duplex settings (autonegotiate). To return all interface settings to the defaults, use the default
interface interface-id interface configuration command.
This example shows how to set the interface speed to 10 Mbps and the duplex mode to half on a
10/100 Mbps port:
Switch# configure terminal
Switch(config)# interface fasttethernet0/3
Switch(config-if)# speed 10
Switch(config-if)# duplex half
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the physical interface to be configured, and enter interface
configuration mode.
Step 3
speed {10 | 100 | 1000 | auto [10 | 100 |
1000] | nonegotiate}
Enter the appropriate speed parameter for the interface:
• Enter 10, 100, or 1000 to set a specific speed for the interface.
The 1000 keyword is available only for ports capable of operating
at this speed.
• Enter auto to enable the interface to autonegotiate speed with the
connected device. If you use the 10, 100, or the 1000 keywords
with the auto keyword, the port autonegotiates only at the
specified speeds.
• The nonegotiate keyword is available only for SFP module ports.
SFP module ports operate only at 1000 Mbps but can be
configured to not negotiate if connected to a device that does not
support autonegotiation.
For more information about speed settings, see the “Speed and Duplex
Configuration Guidelines” section on page 10-11.
Step 4
duplex {auto | full | half} Enter the duplex parameter for the interface.
Enable half-duplex mode (for interfaces operating only at 10 or
100 Mbps). You cannot configure half-duplex mode for interfaces
operating at 1000 Mbps.
For more information about duplex settings, see the “Speed and
Duplex Configuration Guidelines” section on page 10-11.
Step 5
end Return to privileged EXEC mode.
Step 6
show interfaces interface-id Display the interface speed and duplex mode configuration.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.