Duplex - Cisco Catalyst 3030 Command Reference Manual

Chapter 2 Cisco Catalyst Blade Switch 3030 Cisco IOS Commands

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 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
12.2(25)SEE
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
78-17262-01
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.
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.
Cisco Catalyst Blade Switch 3030 Command Reference
duplex
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