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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 an Interface to Transit to Error-Down State When the Receive Optical Power Is Low

Configuring an Interface to Transit to Error-Down State When the Receive Optical Power Is Low


The device records the status of an interface as Error-Down when it detects that a fault occurs. The interface in Error-Down state cannot receive or send packets and the interface indicator is off. Low receive optical power is one of the reasons that cause an interface to transit to the Error-Down state. Low receive optical power on an Ethernet optical interface may cause problems such as packet loss. Because the interface is still in Up state, traffic is still transmitted on the interface even if a backup link is configured. To avoid impact on services, you can configure the interface to change to the Error-Down state when the receive optical power is low. When the receive optical power on the interface falls below the lower alarm threshold, the system disables the interface and records the interface status as ERROR DOWN(transceiver-power-low). Services are then switched to the backup link immediately.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run port transceiver-power-low trigger error-down

    The interface is configured to transit to the Error-Down state when the receive optical power is low.

    By default, the Ethernet optical interface does not transit to the Error-Down state when the receive optical power is low.

  4. Run commit

    The configuration is committed.

Verifying the Configuration

Run the display error-down recovery [ interface interface-type interface-number ] command in any view to check information about the interfaces in Error-Down state.

Follow-up Procedure

If an interface is in Error-Down state, you are advised to find out the cause first. For details, see the possible causes and troubleshooting procedures.

An interface in Error-Down state can be recovered using either of the following methods:
  • Manual recovery (after an Error-Down event occurs):

    If a few interfaces need to be recovered, run the shutdown and undo shutdown commands in the interface view. Alternatively, run the restart command in the interface view to restart the interfaces.

  • Automatic recovery (before an Error-Down event occurs):

    If a large number of interfaces need to be recovered, manual recovery is time consuming and some interfaces may be omitted. To avoid this problem, you can run the error-down auto-recovery cause transceiver-power-low interval command in the system view to enable automatic interface recovery and set the recovery delay time. You can run the display error-down recovery command to view information about automatic interface recovery.


    This method does not take effect on interfaces that are already in Error-Down state. It takes effect only on interfaces that enter the Error-Down state after this configuration is complete.

Updated: 2019-05-05

Document ID: EDOC1100004195

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