Reference Guide

Ethernet Configuration Commands 155
duplex
The duplex Interface Configuration (Ethernet) mode command configures the full/half duplex
operation of a given Ethernet interface when not using auto-negotiation. To restore the default
configuration, use the no form of this command.
Syntax
duplex { half | full }
no duplex
• half — Forces half-duplex operation
•
full — Forces full-duplex operation
Default Configuration
The interface is set to full duplex.
Command Mode
Interface Configuration (Ethernet) mode
User Guidelines
• When configuring a particular duplex mode on the port operating at 10/100 Mbps, disable
the auto-negotiation on that port.
• Half duplex mode can be set only for ports operating at 10 Mbps or 100 Mbps.
Example
The following example configures the duplex operation of Ethernet port 1/e5 to full duplex
operation.
Console(config)# interface ethernet 1/e5
Console(config-if)# duplex full