Clock Module Commands; Clock - Huawei Quidway S8500 Series Command Manual

Command Manual – System Management
Quidway S8500 Series Routing Switches

4.2 Clock Module Commands

4.2.1 clock

Syntax
clock { auto | manual source source }
View
System view
Parameter
auto: The clock works in the auto mode.
manual: The clock works in the manual mode.
source: Sets the primary clock source in manual mode.
source: The index of clock source, ranging from 1 to 18.
Description
Use the clock command to set the work mode of the clock module on the main
processing card (SRPU), namely, the mode of clock selecting clock source, including
auto mode and manual mode.
If it is necessary to set the clock source, you need to query the state of the clock source
first. Only the clock source working normally can be selected.
1) In the manual mode, the clock module does not switch the clock source actively; it
only traces the specified primary clock source. The set clock source priority and
SSM level are not involved in control. If the primary clock source is lost, the phase
lock mode of the clock module switches into Hold.
2) In auto mode
If SSM is not involved in control, the set SSM level will be neglected, and the clock
module will select a clock source by priority. If two clock sources have the same
priority, they will be selected in the high-to-low order from clock source 1 to clock
source 18. If the available clock source with the highest priority is lost, it will be
switched to the next available clock source with the highest priority automatically.
When the original clock source recovers, the clock module will switch to the
original clock source. In this case, the manually set primary clock source will not
work.
If SSM is engaged in control, the clock module will select a clock source by SSM
level first. If two clock sources have the same SSM level, they will be selected by
the priority. If their have the same priority, they will be selected in high-to-low order
from clock source 1 to clock source 18. If the available clock source with highest
SSM level is lost, it will be switched to the next available clock source with the
highest SSM level automatically. When the original clock source recovers, the
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Chapter 4 System Maintenance Commands