Specifications

Command Reference Guide Global Configuration Mode Command Set

interface loopback <label>

Use the interface loopback command to create a virtual interface that can be assigned layer 3 and higher

properties and is always up unless the router is shut down. Use the no form of this command to delete a

configured loopback interface.

Syntax Description

<label>

Specifies the numerical virtual loopback interface identifying label (valid range: 1

to 1024)

Default Values

By default, there are no configured loopback interfaces.

Command Modes

(config)# Global Configuration Mode required

Command History

Release 3.1 Command was introduced

Usage Examples

The following example creates a loopback virtual interface (labeled 1) and enters the Loopback Interface

Configuration Mode:

(config)#

interface loopback 1

(config-loop 1)#