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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 the Delay in Reporting Physical Status Changes

Configuring the Delay in Reporting Physical Status Changes


An Ethernet interface can be physically Up and Down. When the physical interface status changes, the system notifies the upper-layer protocol modules (such as routing and forwarding modules) to guide packet sending and receiving. The system also generates traps and logs to ask users whether to process the physical link.

After you configure the delay in reporting interface status changes, the system will not sense the physical interface status switching within the delay. After the delay, the physical status changes are reported to the system if the physical status is not recovered.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run carrier { up-hold-time | down-hold-time } interval

    The delay in reporting interface status changes is configured.

    By default, the delay in reporting an Up event and that in reporting a Down event are both 0 ms.

    The delay in reporting status changes depends on the network connection status.
    • Set the delay to a larger value.

      For example, the upper-layer protocol convergence time may be longer than the interface status change time in some scenarios. If the interface status changes to Up when the upper-layer protocol convergence is not complete, packet loss may occur. You can set the delay to a larger value to prevent packet loss that occurs because the upper-layer protocol convergence time is longer than the interface status change time.

    • Set the delay to a smaller value.

      For example, after the status of the interface on the master link group changes from physically Up to Down, the system must immediately instruct the upper-layer service forwarding protocol to send service packets from the standby interface on the backup link. You must set a shorter interval to ensure real-time service switchover.


    If the delay in reporting an interface Down event is set to a small value (for example, less than or equal to 2 seconds) and the function does not take effect, you are advised to run the port-status fast-detect enable command in the interface view to enable the function of quickly detecting the interface physical status change. This configuration prevents the system from generating false alarms about the interface status change within the delay specified by interval.

  4. Run commit

    The configuration is committed.

Updated: 2019-05-05

Document ID: EDOC1100004195

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