Catalyst 3750-E and 3560-E Switch Cisco IOS ... - DNIP . NET

duplexChapter 2Catalyst 3750-E and 3560-E Switch Cisco IOS CommandsduplexUse the duplex interface configuration command on the switch stack or on a standalone switch to specifythe duplex mode of operation for a port. Use the no form of this command to return the port to its defaultvalue.duplex {auto | full | half}no duplexSyntax DescriptionautofullhalfEnable automatic duplex configuration; port automatically detects whether itshould 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 Mb/s). Youcannot configure half-duplex mode for interfaces operating at 1000 or10,000 Mb/s.DefaultsThe default is auto for Gigabit Ethernet ports.You cannot configure the duplex mode on 10-Gigabit Ethernet ports; it is always full.The default is half for 100BASE-x (where -x is -BX, -FX, -FX-FE, or - LX) SFP modules.Duplex options are not supported on the 1000BASE-x (where -x is -BX, -CWDM, -LX, -SX, or -ZX)SFP modules.For information about which SFP modules are supported on your switch, see the product release notes.Command ModesInterface configurationCommand HistoryRelease12.2(35)SE2ModificationThis command was introduced.Usage GuidelinesFor Fast Ethernet ports on stack members other than Catalyst 3750-E switches, setting the port to autohas 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 attacheddevice does not autonegotiate the duplex parameter.NoteHalf-duplex mode is supported on Gigabit Ethernet interfaces if the duplex mode is auto and theconnected device is operating at half duplex. However, you cannot configure these interfaces tooperate in half-duplex mode.Certain ports can be configured to be either full duplex or half duplex. Applicability of this commanddepends on the device to which the switch is attached.2-182Catalyst 3750-E and 3560-E Switch Command ReferenceOL-9776-08