duplex
To specify the duplex mode of operation for a port, use the duplex command in interface configuration mode.
To return to the default value, use the no form of this command.
duplex {auto| full| half}
no duplex {auto| full| half}
Syntax Description
Enables automatic duplex configuration. The port automatically detects whether it should
run in full- or half-duplex mode, depending on the attached device mode.
auto
Enables full-duplex mode.full
Enables half-duplex mode (only for interfaces operating at 10 or 100 Mb/s). You cannot
configure half-duplex mode for interfaces operating at 1000 or 10,000 Mb/s.
half
Command Default
The default is auto for Gigabit Ethernet ports.
You cannot configure the duplex mode on 10-Gigabit Ethernet ports; it is always full.
Duplex options are not supported on the 1000BASE-x or 10GBASE-x (where -x is -BX, -CWDM, -LX, -SX,
or -ZX) small form-factor pluggable (SFP) modules.
Command Modes
Interface configuration
Command History
ModificationRelease
This command was introduced.Cisco IOS XE 3.3SE
Usage Guidelines
For Gigabit Ethernet ports, setting the port to auto has the same effect as specifying full if the attached device
does not autonegotiate the duplex parameter.
Half-duplex mode is supported on Gigabit Ethernet interfaces if the 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.
Note
Certain ports can be configured to be either full duplex or half duplex. How this command is applied depends
on the device to which the switch is attached.
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
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duplex
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