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Configuration Guide - Device Management

S2720, S5700, and S6720 V200R013C00

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

Configuring a Line Clock Source

Context

To implement clock synchronization on a switch, configure a clock source first. When a switch needs to restore time signals through Ethernet code streams received by Ethernet interfaces, the switch must be configured to trace a line 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 0, 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).

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run clock ethernet-synchronization enable

    The synchronous Ethernet function is enabled.

    By default, the synchronous Ethernet function is not enabled.

  3. Run interface interface-type interface-number

    The view of the interface on which the line clock source resides is displayed.

  4. Run clock synchronization enable

    The clock synchronization function is enabled.

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

  5. Run clock priority priority-value

    A priority is configured for the line clock source.

    By default, the priority of a line clock source is 0, indicating that the clock source does not participate in clock source selection. A smaller priority value indicates a higher priority.

  6. (Optional) Run clock ssm { unk | prc | ssua | ssub | sec | dnu }

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

    By default, the SSM quality level of a line clock source is sent from the peer device.

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Updated: 2019-04-20

Document ID: EDOC1100065674

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