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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Configuring a Loopback Interface

Configuring a Loopback Interface

A loopback interface is always Up at the physical layer and link layer unless it is manually shut down. You can configure loopback interfaces to enhance network reliability.

Context

The loopback interface has the following features:

  • A loopback interface is always Up at the physical layer and link layer unless it is manually shut down. It has the loopback feature.
  • The loopback interface can be configured with the mask of all 1s.

Based on the preceding 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.
  • The loopback interface is configured as the source interface to send boarder gateway protocol (BGP) packets to ensure that the BGP session functions correctly when the physical interface is faulty.
  • The loopback interface can be configured with the mask of 255.255.255.255 to save IP address resources.

Pre-Configuration

Before configuring a loopback interface, complete the following task:

  • Powering on the device and performing self-check

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface loopback loopback-number

    A loopback interface is created and the loopback interface view is displayed.

  3. Run ip address ip-address { mask | mask-length } [ sub ]

    The IP address of the loopback interface is configured.

  4. (Optional) Run trigger trap { linkup | linkdown }

    The device is configured to report alarms to the network management system.

Verifying the Configuration

  • Run the display interface loopback [ loopback-number ] command to check the status of a loopback interface.
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Updated: 2019-03-06

Document ID: EDOC1100069331

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