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Configuration Guide - Device Management

S7700 and S9700 V200R013C00

This document describes the configurations of Device Management, including device status query, hardware management, CSS, SVF, PoE, OPS, OIDS, energy-saving management, information center, fault management, NTP, synchronous ethernet, PTP.
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Configuring a PTP Clock Source

Configuring a PTP Clock Source


To implement clock synchronization on a switch, configure a clock source first. If a switch uses PTP messages to restore clock signals (for example, an upstream device uses 1588v2 to transmit clock signals), configure the switch to trace a PTP clock source.

When multiple clock sources are available, a switch selects a clock source as its reference clock according to the clock source priority and Synchronization Status Message (SSM) quality level.
  • Clock source priority

    The default priority for a clock source is 255, indicating that this clock source does not participate in clock source selection. To enable the clock source to participate in clock source selection, specify a priority for it.

    A lower priority value indicates a higher priority of a clock source.

  • Clock source SSM quality level

    An SSM is a group of codes used to indicate the clock quality level on a synchronized network. SSM reflects the level of synchronous timing signals transmitted on a synchronous timing link. A higher clock accuracy indicates a higher SSM quality level. A device can be configured to select a clock source according to the SSM quality level.

    SSM quality levels are sorted in descending order of preference: primary reference clock (PRC), Synchronization Supply Unit A (SSU-A), Synchronization Supply Unit B (SSU-B), SDH equipment clock (SEC), and Do Not Use (DNU).


  1. Run system-view

    The system view is displayed.

  2. Run clock source ptp synchronization enable

    The clock synchronization function is enabled for the PTP clock source.

    By default, the clock synchronization function is not enabled for a PTP clock source.

  3. Run clock source source priority priority { system | bits0 | bits1 }

    A priority is configured for the clock source traced by an external clock source.

    By default, the priority of an internal clock source and a system clock source is 254, and the priority of other clock sources is 255. A smaller priority value indicates a higher priority.

    • The priority of a system clock source ranges from 0 to 8.
    • The priority of a BITS source ranges from 5 to 9.

  4. Run clock source source ssm { prc | ssua | ssub | sec | dnu }

    An SSM quality level is configured for the PTP clock source.

    By default, the SSM quality level of a PTP clock source is SEC.

Updated: 2019-04-20

Document ID: EDOC1100065738

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