There are two types:

1, Automatic switching

Huawei STG/XCH/UXCM detects its own status through hardware or software. If it is in the abnormal status, a switching is performed automatically. The switching is performed by the board and no manual operation is required.

The following conditions trigger automatic switching:
A hardware fault occurs on the STG/XCH/UXCM board.
The STG/XCH/UXCM board goes offline when, for example, it is removed or undergoes a cold reset.
Switching occurs between the active and standby cross-connect boards in an OptiX OSN 8800 T64/T32 subrack.

2,Manual switching

When a switching is required in a test during the normal running of the active and the standby STG/UXCMs/XCH board, the switching can be performed manually.