How can I perform an active/standby switchover on a CE12800 switch

After an active/standby switchover is performed on a CE12800 switch, the standby MPU becomes the new active MPU. To perform an active/standby switchover, run:
<HUAWEI> system-view
[~HUAWEI] slave switchover enable      //Enable the active/standby switchover.
[*HUAWEI] commit
[~HUAWEI] slave switchover      //Perform an active/standby switchover.
Warning: This operation will switch the slave board to the master board. Continue? [Y/N]: y