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S12700 V200R013C00 Configuration Guide - Interface Management

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 Optical Power Is Low

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


Low 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 optical power is low. When the 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) state (indicating that the interface is Down because of low optical power). 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 set transceiver { transmit-power | receive-power } { upper-threshold | lower-threshold } threshold

    The optical power alarm thresholds are configured for optical modules.

    The default power alarm thresholds vary according to the optical module types.

  4. Run transceiver power low trigger error-down

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

    By default, an interface does not transit to the Error-down state when the optical power is low.

Verifying the Configuration

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

Follow-up Procedure

An interface in Error-down state can be recovered using either of the following methods:
  • Manual recovery: If a few interfaces need to be recovered forcibly, 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: If a large number of interfaces need to be recovered, manual recovery is time consuming and some interfaces may be omitted. You can run the error-down auto-recovery cause transceiver-power-low interval interval-value command in the system view to enable automatic interface recovery and set the recovery delay time. An interface in Error-down state automatically recovers when the specified delay time expires.
Updated: 2019-04-08

Document ID: EDOC1100065645

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