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Configuration Guide - Interface Management

CloudEngine 12800 and 12800E V200R003C00

This document describes the interface management configuration, including basic interface configuration, Ethernet interface configuration, and logical interface configuration.

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Configuring a Loopback Interface

Configuring a Loopback Interface

Context

The loopback interface has the following features:

  • The loopback interface is always Up and 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 tasks:

  • 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.

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

  3. Run ip address ip-address { mask | mask-length }

    The IP address of the loopback interface is configured.

  4. Run commit

    Commit the configuration.

Verifying the Configuration

  • Run the display interface loopback [ loopback-number ] command to check the status of a loopback interface.
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Updated: 2019-05-05

Document ID: EDOC1100004195

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