Cisco Catalyst 3750 Metro Command Reference Manual page 129

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Catalyst 3750 Metro Switch Cisco IOS Commands

Beginning with Cisco IOS Release 12.2(25)EY, you can configure the duplex setting when the speed is

set to auto.

This command is not available on SFP module ports unless a 1000BASE-T SFP module or a

100BASE-FX MMF SFP module is in the port. All other SFP modules operate only in full-duplex mode.

Changing the interface speed and duplex mode configuration might shut down and reenable the interface

during the reconfiguration.

For guidelines on setting the switch speed and duplex parameters, see the "Configuring Interface

Characteristics" chapter in the software configuration guide for this release.

This example shows how to configure a port for full duplex operation:

Switch(config)# interface fastethernet1/0/11

Switch(config-if)# duplex full

You can verify your setting by entering the show interfaces privileged EXEC command.

Related Commands

show interfaces

When a 1000BASE-T SFP module is in the SFP module port, you can configure duplex mode to auto

When a 100BASE-FX SFP module is in the SFP module port, you can configure duplex mode to

half or full. Although the auto keyword is available, it puts the interface in half-duplex mode (the

default) because the 100BASE-FX SFP module does not support autonegotiation.

The 100BASE-FX SFP modules are not supported on the ES ports.

Displays the interface settings on the switch.

Sets the speed on a 10/100 or 10/100/1000 Mbps interface.

Catalyst 3750 Metro Switch Command Reference