No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


S12700 V200R010C00 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
(Optional) Configuring Other Attributes of a Clock Source

(Optional) Configuring Other Attributes of a Clock Source

Applicable Environment

To control clock synchronization more effectively, perform the following operations:

  • Set the transmission mode of clock synchronization and time synchronization of a BITS clock.
  • Set the ID of a clock source to prevent timing loops generated in the SSM extended mode.
  • Set the priorities of the clock sources provided by different interfaces to specify the sequence of the clock source signals sent from different interfaces to the main control board. Only the interface of the highest priority can send the clock source signal to the main control board.
  • Lock a clock source to prevent the clock source from being selected.
  • Enable the result of frequency offset check to affect clock source selection. The clock sources with greater frequency offset have lower priority in clock source selection.
  • Set the delay time for the system to consider a clock source lost and the wait-to-restore (WTR) time of the clock source to prevent frequent switchover of clock sources caused by network flapping.
  • Set the permanent holding mode. In this mode, when all the clock sources are lost, the clock module enters the holding state and retains the original frequency offset according to the clock information traced before.


    The permanent holding mode is not recommended.

  • Set the non-retrieve mode. In this mode, the system changes the clock source only when the original clock source fails.

Pre-configuration Tasks

Before configuring the attributes of a clock source, complete the following tasks:

  • Set 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.
  • Configure the routing protocol to make the IP routes between the nodes reachable.
  • Set the mode of clock source selection either based on the SSM quality level or priority.

Configuration Process

The following configuration tasks are optional and can be performed in any sequence.

Updated: 2019-08-21

Document ID: EDOC1000142080

Views: 109868

Downloads: 144

Average rating:
This Document Applies to these Products
Related Version
Related Documents
Previous Next