Layer 2 Switching Commands 385
Command Mode
Interface Configuration (gigabitethernet, port-channel, tengigabitethernet,
fortygigabitethernet) mode
User Guidelines
This command has no user guidelines.
Example
The following example adds a description to the Ethernet port 5.
console(config)#interface gigabitethernet 1/0/5
console(config-if-Gi1/0/5)# description RD_SW#3
duplex
Use the duplex command in Interface Configuration mode to configure the
duplex operation of a given Ethernet interface. To restore the default, use the
no form of this command.
Syntax
duplex {auto | half | full}
no duplex
• auto—Enable auto-negotiation for the port.
• half—Force half-duplex operation and disable auto-negotiation.
• full—Force full-duplex operation and disable auto-negotiation.
Default Configuration
Auto-negotiation is enabled by default on copper ports.
Command Mode
Interface Configuration (Ethernet) mode
User Guidelines
When both speed and duplex are configured to auto, auto negotiation is
enabled for the port. To disable auto-negotiation on a port, it is necessary to
enter either the speed or duplex commands without using the auto
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