The duplex setting remains as configured on each end of the link, which could result in a duplex setting mismatch. If the speed is set to auto, the switch negotiates with the device at the other end of the link for the speed setting and then forces the speed setting to the negotiated value. If one interface supports autonegotiation and the other end does not, configure duplex and speed on both interfaces, and use the auto setting on the supported side. If both ends of the line support autonegotiation, we highly recommend using the default autonegotiation settings. How this command is applied depends on the device to which the switch is attached. However, you cannot configure these interfaces to operate in half-duplex mode.Ĭertain ports can be configured to be either full duplex or half duplex. Half-duplex mode is supported on Gigabit Ethernet interfaces if the duplex mode is auto and the connected device is operating at half duplex. Interface configuration Command History Releaseįor 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.įor 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. The default is half for 100BASE -x (where -x is -BX, -FX, -FX-FE, or -LX) SFP modules.ĭuplex 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. The default is auto for Fast Ethernet and Gigabit Ethernet ports. You cannot configure half-duplex mode for interfaces operating at 1000 or 10,000 Mb/s.

The port automatically detects whether it should run in full- or half-duplex mode, depending on the attached device mode.Įnables half-duplex mode (only for interfaces operating at 10 or 100 Mb/s). Syntax DescriptionĮnables automatic duplex configuration. To disable debugging, use the no form of this command. To enable debugging of the Ethernet management port, use the debug fastethernet command in EXEC mode.

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