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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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Master/Standby Switchover

Master/Standby Switchover

Many factors can cause master/standby switchover events in a CSS. The following describes master/standby switchover events triggered by MPU failures and those triggered using commands.

Master/Standby Switchover Triggered by an MPU Failure

Roles in a CSS may change if an MPU of the CSS fails. The switchover process differs depending on whether the MPU is the system master, the system standby, or a candidate standby.

  • The system master MPU fails.

    Figure 8-19 shows how the roles in both chassis 1 and 2 change after the system master MPU fails.

    Figure 8-19  Changes of roles after a failure of the system master MPU
    • The original standby switch becomes the master switch, and the original system standby MPU becomes the system master MPU.
    • 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 master MPU.
  • The system standby MPU fails.

    Figure 8-20 shows how the roles in both chassis 1 and 2 change after the system standby MPU fails.

    Figure 8-20  Change of roles after a failure of the system standby MPU
    • The master and standby switches retain their roles.
    • The standby MPU of the standby switch becomes the system standby MPU and synchronizes data with the system master MPU.
  • A candidate standby MPU fails.

    Failures of candidate standby MPUs do not cause any change of roles in the CSS.

Master/Standby Switchover Triggered Using Commands

Figure 8-21 shows how the roles in both chassis 1 and 2 change after a master/standby switchover is triggered using commands.
Figure 8-21  Change of roles after a command-triggered master/standby switchover
  • The original standby switch becomes the master switch, and the original system standby MPU becomes the system master MPU.
  • The original system master MPU becomes a candidate 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 master MPU.
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Updated: 2019-08-21

Document ID: EDOC1000142080

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