Cisco Systems 3560 - page 323

11-19
Catalyst 3560 Switch Software Configuration Guide
OL-8553-06
Chapter 11 Configuring Interface Characteristics
Configuring Ethernet Interfaces
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 Mb/s and the duplex mode to half on a
10/100 Mb/s port:
Switch# configure terminal
Switch(config)# interface fasttethernet0/3
Switch(config-if)# speed 10
Switch(config-if)# duplex half
This example shows how to set the interface speed to 100 Mb/s on a 10/100/1000 Mb/s port:
Switch# configure terminal
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# speed 100
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 10/100/1000 Mb/s ports.
• 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 Mb/s 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 11-18.
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 Mb/s). You cannot configure half-duplex mode for interfaces
operating at 1000 Mb/s.
Beginning with Cisco IOS Release 12.2(20)SE1, you can configure
the duplex setting when the speed is set to auto.
For more information about duplex settings, see the “Speed and
Duplex Configuration Guidelines” section on page 11-18.
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.
Command Purpose