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Catalyst 3750 Metro Switch Command Reference
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Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
duplex
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.
• When a 1000BASE-T SFP module is in the SFP module port, you can configure duplex mode to auto
or full.
• 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.
Note The 100BASE-FX SFP modules are not supported on the ES ports.
Caution 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.
Examples 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 Command Description
show interfaces Displays the interface settings on the switch.
speed Sets the speed on a 10/100 or 10/100/1000 Mbps interface.
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