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Master/Standby Switchover
Many factors can cause master/standby switchover events in a CSS. This section describes master/standby switchover events triggered by MPU failures or a command.
Master/Standby Switchover Triggered by an MPU Failure
Roles in a CSS may change if a system MPU of the CSS fails.
The system master MPU fails.
Figure 10-19 shows the change of roles after the system master MPU fails.
- 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 10-20 shows the change of roles after the system standby MPU fails.
- 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 system standby MPU fails.
Failures of candidate standby MPUs do not cause any change of roles in the CSS.
Master/Standby Switchover Triggered by a Command
Figure 10-21 shows change
of roles after a master/standby switchover is triggered by commands.
- 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 system standby MPU, and the original 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.