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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 Internal Loopback Detection

Configuring Internal Loopback Detection


When testing some special functions such as locating an Ethernet fault, you must enable loopback detection on the Ethernet interface to check whether the interface is working properly. When no fault occurs on the Ethernet interface, the physical and protocol interface statuses are always Up after loopback detection is enabled. If a fault occurs on the Ethernet interface, the interface status is Down.

  • The loopback detection function (configured using the loopback command) affects other functions; therefore, the interface or link cannot work properly. When the test is complete, you must run the undo loopback command in real time to disable loopback. The original configuration is restored after loopback detection is disabled.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run loopback internal

    Internal loopback detection is configured on the Ethernet interface.

    By default, loopback detection is disabled on an Ethernet interface.

  4. Run commit

    The configuration is committed.

Verifying the Configuration

Run the display interface [ interface-type [ interface-number ] ] command in any view or the display this interface command in the interface view to check the current interface status. For details, check the Loopback field in the command output.

Updated: 2019-05-05

Document ID: EDOC1100004195

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