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Cisco Catalyst Blade Switch 3120 for HP Command Reference
OL-12248-01
Chapter 2 Cisco Catalyst Blade Switch 3120 for HP Cisco IOS Commands
duplex
duplex
Use the duplex interface configuration command on the switch stack or on a standalone switch 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.
duplex {auto | full | half}
no duplex
Syntax Description
Defaults The default is auto for Gigabit Ethernet ports.
You cannot configure the duplex mode on 10-Gigabit Ethernet ports or on internal 1000 Mb/s ports; it is
always full.
The default is full for the 100BASE- LX small form-factor pluggable (SFP) modules.
Duplex options are not supported on the )1000BASE-SX SFP modules.
For information about which SFP modules are supported on your switch, see the product release notes.
Command Modes Interface configuration
Command History
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.
Note 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.
auto Enable automatic duplex configuration; port automatically detects whether it
should run in full- or half-duplex mode, depending on the attached device mode.
full Enable full-duplex mode.
half Enable 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.
Release Modification
12.2(40)EX This command was introduced.
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