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Alarm Handling

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

This document provides the trap description, attributes, parameters, impact on the system, possible causes, procedures, and references. This document provides a complete set of traps, through which intended readers are kept of the running status of the device so as to locate faults.

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
HDLC_1. hwHdlcLoopbackDetect

HDLC_1. hwHdlcLoopbackDetect


HDLC/4/LOOPBACK:OID [oid] Interface loopback is detected. (InterfaceIndex=[INTEGER], InterfaceName=[STRING])

An HDLC protocol keepalive packet detected a loop, triggering the alarm.


Alarm ID Alarm Severity Alarm Type Warning environmentalAlarm (6)


Name Meaning


Indicates the MIB object ID of the alarm.


Interface index


Interface name

Impact on the System

The HDLC link between the two ends remains Up but the traffic on the two ends cannot be properly forwarded.

Possible Causes


The loopback command had been run on the interface of the HDLC link.
(The loopback function is used for specific tests and is not enabled usually.)


A loop existed on the network.


  1. Run the display interface command on the interface of the HDLC link to check whether the message "loopback is detected" is displayed.

    • If the message is displayed, go to step 2.
    • If the message is not displayed, go to step 6.

  2. Run the display current-configuration command to check whether the loopback function has been configured on the interface.

    • If the loopback function has been configured, go to step 3.
    • If the loopback function is not configured, go to step 4.

  3. Run the undo loopback command to delete the loopback function and check whether the alarm is cleared.

    • If the alarm is cleared, go to step 6.
    • If the alarm is not cleared, go to step 4.

  4. Eliminate the existing loop based on the networking diagram and check whether the alarm is cleared.

    • If the alarm is cleared, go to step 6.
    • If the alarm is not cleared, go to step 5.

  5. Collect alarm information and configuration information, and then contact technical support personnel.
  6. End.
Updated: 2019-03-06

Document ID: EDOC1100041475

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