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duplex
duplex
Use the duplex interface configuration command to specify the duplex mode of operation for a port. Use
the no form of this command to return the port to its default value.
Syntax Description
auto
full
half
Defaults
The default is auto for Fast Ethernet and Gigabit Ethernet ports.
The default is full for 100BASE-x (where -x is -BX, -FX, -FX-FE, and - LX) SFP modules.
Duplex options are not supported on the 1000BASE-x (where -x is -BX, -CWDM, -LX, -SX, and -ZX)
SFP modules.
For information about which SFP modules are supported on your switch, see the product release notes.
Command Modes
Interface configuration
Command History
Release
12.1(19)EA1
12.1(20)SE
Usage Guidelines
For Fast Ethernet ports, setting the port to auto has the same effect as specifying half if the attached
device does not autonegotiate the duplex parameter.
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.
Note
Catalyst 3560 Switch Command Reference
2-106
duplex {auto | full | half}
no duplex
Enable automatic duplex configuration; port automatically detects whether it
should run in full- or half-duplex mode, depending on the attached device mode.
Enable full-duplex mode.
Enable half-duplex mode (only for interfaces operating at 10 or 100 Mbps). You
cannot configure half-duplex mode for interfaces operating at 1000 or 10,000
Mbps.
Modification
This command was introduced.
Support for the half keyword was added for the 100BASE-FX SFP module.
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.
Chapter 2
Catalyst 3560 Switch Cisco IOS Commands
78-16405-05
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