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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 9 Configuring Interfaces 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 fasttethernet0/3
Switch(config-if)# no shutdown
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 gigabitethernet0/2
Switch(config-if)# speed 100
Configuring a Dual-Purpose Port
Some ports on the ME 3400-12CS and the ME 3400-2CS switches are dual-purpose ports that can be
configured as 10/100/100 ports or as small form-factor pluggable (SFP) module ports. Each
dual-purpose port is considered as a single interface with dual front ends (an RJ-45 connector and an
SFP module connector).
Note The dual-purpose ports are Gigabit Ethernet ports (gigabitethernet 0/1 through gigabitethernet 0/12 on
the ME 3400-12CS and 0/1 and 0/2 on the ME 3400-2CS switch. Each switch also has standard SFP-only
module ports (gigabitethernet 0/13 through 0/16 on the Cisco ME 3400-12CS and 0/3 through 0/4 on the
ME 3400-2CS switch). Even when operating at 10 or 100 Mbps, the dual-purpose ports (and the
SFP-only module ports) use the frame size that is set with the system mtu jumbo global configuration
command.
Step 5 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.
You can configure the duplex setting when the speed is set to auto.
This command is not available on SFP module ports with these
exceptions:
• If a Cisco 1000BASE-T SFP module is inserted, you can
configure duplex to auto or to full.
• If a Cisco 100BASE-FX SFP module is inserted, you can
configure duplex to full or to half. Although the auto keyword is
available, it puts the interface in half-duplex mode (the default).
Step 6 end Return to privileged EXEC mode.
Step 7 show interfaces interface-id Display the interface speed and duplex mode configuration.
Step 8 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose