Switchport - Cisco catalyst 3750 Command Reference Manual

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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.

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.

By default, all interfaces are in Layer 2 mode.

Command Modes

Interface configuration

Command History

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.

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.

Catalyst 3750 Switch Command Reference

no switchport

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.

Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

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