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Catalyst 3750 Switch Software Configuration Guide
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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 Mbps and the duplex mode to half on a
10/100 Mbps port:
Switch# configure terminal
Switch(config)# interface fasttethernet1/0/3
Switch(config-if)# speed 10
Switch(config-if)# duplex half
This example shows how to set the interface speed to 100 Mbps on a 10/100/1000 Mbps port:
Switch# configure terminal
Switch(config)# interface gigabitethernet1/0/2
Switch(config-if)# speed 100
Step 3
speed {10 | 100 | 1000 | auto | 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 Mbps ports
or SFP module ports with a 1000BASE-T SFP module.
• Enter auto to enable the interface to autonegotiate speed with the
device connected to the interface.
• 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.
This command is not available on a 10-Gigabit Ethernet interface.
Note When a 1000BASE-T SFP module is in the SFP module port,
the speed can be configured to 10, 100, 1000, or auto, but not
nonegotiate.
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.
This command is not available on a 10-Gigabit Ethernet interface.
This command is not available on SFP module ports with these
exceptions:
• If a 1000BASE-T SFP module is inserted, you can configure
duplex to auto or full.
• If a 100BASE-FX SFP module is inserted, you can configure
duplex to full or half. Although the auto keyword is available, it
puts the interface in half-duplex mode (the default)
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
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