Cisco WS-C3560E-48PD-SF Command Reference - Page 650

switchport Chapter 2 Catalyst 3560 Switch Cisco IOS Commands switchport Use the switchport interface configuration command with no keywords to put an interface that is in Layer 3 mode into Layer 2 mode for Layer 2 configuration. Use the no form of this command to put an interface in Layer 3 mode. switchport no switchport Use the no switchport command (without parameters) to set the interface to the routed-interface status and to erase all Layer 2 configurations. You must use this command before assigning an IP address to a routed port. Syntax Description This command has no arguments or keywords. Defaults By default, all interfaces are in Layer 2 mode. Command Modes Interface configuration Command History Release 12.1(19)EA1 12.2(20)SE Modification This command was introduced. Previous configuration information on an interface is removed when the interface changes between Layer 2 mode and Layer 3 mode or between Layer 3 mode and Layer 2 mode. Usage Guidelines Entering the no switchport command shuts the port down and then re-enables it, which might generate messages on the device to which the port is connected. In Release 12.2(20)SE and later, when you put an interface that is in Layer 2 mode into Layer 3 mode (or the reverse), the previous configuration information related to the affected interface might be lost, and the interface is returned to its default configuration. Note If an interface is configured as a Layer 3 interface, you must first enter this switchport command with no keywords to configure the interface as a Layer 2 port. Then you can enter additional switchport commands with keywords, as shown on the pages that follow. 2-618 Catalyst 3560 Switch Command Reference 78-16405-05