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Cisco ME 3800X and ME 3600X Switch Command Reference
OL-28238-01
Chapter 2 Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands
duplex
Note Half-duplex mode is supported on Gigabit Ethernet interfaces if duplex mode is auto and the
connected device is operating at half duplex. However, you cannot configure these interfaces to
operate in half-duplex mode.
If both ends of the line support autonegotiation, we highly recommend using the default autonegotiation
settings. If one interface supports autonegotiation and the other end does not, configure duplex and speed
on both interfaces; do use the auto setting on the supported side.
If the speed is set to auto, the switch negotiates with the device at the other end of the link for the speed
setting and then forces the speed setting to the negotiated value. The duplex setting remains as
configured on each end of the link, which could result in a duplex setting mismatch.
You can configure the duplex setting when the speed is set to auto.
Caution Changing the interface speed and duplex mode configuration might shut down and re-enable the
interface during the reconfiguration.
Note For guidelines on setting the switch speed and duplex parameters, see the software configuration guide
for this release.
You can verify your setting by entering the show interfaces privileged EXEC command.
Examples This example shows how to configure an interface for full duplex operation:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# duplex full
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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