Setting The Priority Of A Clock Source; Huawei Proprietary And Confidential - Huawei Quidway S9300 Configuration Manual

Quidway S9300 Terabit Routing Switch
Configuration Guide - Device Management
The primary reference clock must be stable. When configuring multiple clock sources, you need
to clock a backup clock transmission path. When clock signals are lost on the original clock
transmission path, a new clock source is selected and clock signals are transmitted on the backup
path.
Pre-configuration Tasks
Before selecting the clock source based on the priority, complete the following tasks:
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Data Preparation
To select the clock source based on the priority, you need the following data.
No.
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3

11.5.2 Setting the Priority of a Clock Source

After you set priorities of clock sources, the system selects the reference clock source based on
priorities.
Context
To perform clock switchover of the clock source based on the priority, you need to disable the
SSM quality level from being used in clock source selection.
Do as follows on the S9300.
Procedure
Step 1 Run:
system-view
Issue 03 (2011-12-29)
Setting parameters of the link layer protocol and IP addresses for the interfaces to ensure
that the link layer protocol on the interfaces is in Up state
Configuring the routing protocol to make the IP routes between the nodes reachable
Disabling the SSM quality level from being used in clock source selection
Cancelling the configuration of forcible or manual clock source selection
Ensuring the clock that will be configured to meet the following conditions:
– All clock sources provide valid clock signals.
– The result of frequency offset check does not affect clock source selection or the
frequency offset of the clock sources is within the specified range.
– The clock sources are not locked.
Data
Priority of each clock source determined by the SSM quality level or other factors
Clock for which you want to select the clock source based on the priority, namely,
the system clock, BITS0 clock, or BITS1 clock
Number of each clock source

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