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S12700 V200R010C00 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.

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Configuring Active/Standby Switchover

Configuring Active/Standby Switchover

Context

If the system active MPU becomes faulty, you can perform an active/standby MPU switchover.

After a command is executed to perform an active/standby switchover on a standalone device, the standby MPU becomes the new active MPU, and the active MPU restarts and then becomes the new standby MPU.

Figure 2-1 shows change of roles after an active/standby switchover in a CSS is triggered by commands.
Figure 2-1  Change in roles after a command-triggered active/standby switchover
  • The original standby switch becomes the master switch, and the original system standby MPU becomes the system active MPU.
  • The original system active MPU becomes a candidate system standby MPU, and the original master switch becomes the standby switch.
  • The standby MPU of the original master switch becomes the system standby MPU and synchronizes data with the system active MPU.
NOTE:

Before running a command to perform an active/standby switchover in a CSS, ensure that the master switch in the CSS has two MPUs.

Before performing an active/standby switchover, check whether MPUs meet switchover requirements. Do not perform an active/standby switchover on a device in any of the following situations:
  • The file system is in use. For example, a file or directory is being created, deleted, or saved.

  • The device is loading or deleting LPU information, including the following operations:
    • Hot swap LPUs.

    • Use commands to reset LPUs.

  • The active and standby MPUs have different memory sizes.

During an active/standby switchover, do not insert, remove, or reset active and standby MPUs, LPUs, power modules, or fan modules. Otherwise, the device may restart or become faulty.

Procedure

  1. (Optional) Run:

    display switchover state

    The active/standby switchover status is displayed. According to the status, you can determine whether the active and standby MPUs meet switchover requirements.

  2. Run:

    system-view

    The system view is displayed.

  3. Run:

    slave switchover enable

    Active/standby switchover is enabled.

    By default, the active/standby switchover function is enabled.

  4. Run:

    slave switchover

    An active/standby switchover is performed.

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Updated: 2019-12-28

Document ID: EDOC1000142080

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