Cisco Catalyst 3750-X Command Reference Manual page 931

Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
For guidelines on setting the switch speed and duplex parameters, see the "Configuring Interface
Characteristics" chapter in the software configuration guide for this release.
Examples
This example shows how to set speed on a port to 100 Mb/s:
Switch(config)# interface gigabitethernet1/0/117
Switch(config-if)# speed 100
This example shows how to set a port to autonegotiate at only 10 Mb/s:
Switch(config)# interface gigabitethernet1/0/118
Switch(config-if)# speed auto 10
This example shows how to set a port to autonegotiate at only 10 or 100 Mb/s:
Switch(config)# interface gigabitethernet1/0/117
Switch(config-if)# speed auto 10 100
You can verify your settings by entering the show interfaces privileged EXEC command.
Related Commands Command
duplex
show interfaces
OL-29704-01
Description
Specifies the duplex mode of operation.
Displays the statistical information specific to all interfaces or to a specific
interface.
Catalyst 3750-X and 3560-X Switch Command Reference
speed
2-899