Cisco WS-C3560E-48PD-SF Command Reference - Page 639
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Chapter 2 Catalyst 3560 Switch Cisco IOS Commands speed speed Use the speed interface configuration command to specify the speed of a 10/100 Mbps or 10/100/1000 Mbps port. Use the no or default form of this command to return the port to its default value. speed {10 | 100 | 1000 | auto [10 | 100 | 1000] | nonegotiate} no speed Syntax Description 10 100 1000 auto nonegotiate Port runs at 10 Mbps. Port runs at 100 Mbps. Port runs at 1000 Mbps. This option is valid and visible only on 10/100/1000 Mbps-ports. Port automatically detects the speed it should run at based on the port at the other end of the link. If you use the 10, 100, or 1000 keywords with the auto keyword, the port only autonegotiates at the specified speeds. Autonegotiation is disabled, and the port runs at 1000 Mbps. ( Defaults The default is auto. Command Modes Interface configuration Command History Release 12.1(19)EA1 12.2(20)SE1 Modification This command was introduced. Support for the 10, 100, and 1000 keywords with the auto keyword was added. Usage Guidelines Except for the 1000BASE-T SFP modules, if an SFP module port is connected to a device that does not support autonegotiation, you can configure the speed to not negotiate (nonegotiate). 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. The duplex setting remains as configured on each end of the link, which could result in a duplex setting mismatch. If both ends of the line support autonegotiation, we highly recommend the default autonegotiation settings. If one interface supports autonegotiation and the other end does not, do use the auto setting on the supported side, but set the duplex and speed on the other side. Caution Changing the interface speed and duplex mode configuration might shut down and re-enable the interface during the reconfiguration. For guidelines on setting the switch speed and duplex parameters, see the "Configuring Interface Characteristics" chapter in the software configuration guide for this release. 78-16405-05 Catalyst 3560 Switch Command Reference 2-607