Configuring a loopback interface

Overview

The loopback interface is always up to ensure network reliability, which has the following features:

• It is always up and has the loopback feature.

• It can be configured with the mask of all 1s.

Based on the features, the loopback interface has the following applications:

• The IP address of a loopback interface is specified as the source address of packets to improve network reliability.

• When no Router ID is configured for dynamic routing protocols, the maximum IP address of the loopback interface is configured as the router ID automatically.

Procedure

Step1         In the configuration mode, specify the name and IP address for the loopback interface.

Step2         Commit the configuration.

Verifying the Configuration

After the configuration is completed, in the configuration mode, use run show l3-interface loopback <loopback-name> command to view the state, IP address, description and traffic statistics.

Other Configurations

By default, the loopback interface is enabled when created. To disable the loopback interface, use set l3-interface loopback <interface-name> disable command.

To clear the configuration of loopback interface, use delete l3-interface loopback interface <interface-name> command.