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S12700 V200R010C00 Configuration Guide - Interface Management

This document describes the principles and configurations of interfaces and provides configuration examples.
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Configuring a Loopback Interface

Configuring a Loopback Interface


A loopback interface has the following features:

  • Is always Up and has the loopback feature.
  • 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 automatically configured as the router ID.
  • The loopback interface is configured as the source interface to send boarder gateway protocol (BGP) packets to ensure that the BGP session functions properly when the physical interface is faulty.
  • The loopback interface can be configured with the mask of to save IP address resources.
  • The loopback interface can be assigned an IPv4 address, bound to a VPN instance, and configured to check the source IPv4 addresses of packets.


Before configuring a loopback interface, power on the device and perform self-check.


  1. Run:


    The system view is displayed.

  2. Run:

    interface loopback loopback-number

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

    You can create or delete a loopback interface dynamically. After a loopback interface is created, the link-layer protocol is always Up unless the loopback interface is deleted.

  3. (Optional) Run:

    ip binding vpn-instance vpn-instance-name

    The loopback interface is bound to the VPN instance.

  4. Run:

    ip address ip-address { mask | mask-length } [ sub ]

    The IP address of the loopback interface is configured.

  5. (Optional) Run:

    ip verify source-address

    The loopback interface is configured to check the source IPv4 addresses of packets.

Checking the Configuration

  • Run the display interface loopback [ loopback-number ] command to check the status of a loopback interface.
Updated: 2019-04-18

Document ID: EDOC1000142085

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