Cross-domain clock synchronization method and system based on PTP (Precision Time Protocol)

Abstract

The invention relates to a cross-domain clock synchronization method and system based on a PTP (Precision Time Protocol). The method comprises the steps of judging whether a master clock in the local setting domain loses or not when clock synchronization is carried out by a switchboard according to a set period, judging whether the master clock is connected with other domains or not when the master clock in the local setting domain is determined to be lost; selecting one domain in the stored domains when the master clock is connected with other domains; synchronizing the local clock according to the clock information of the selected domain; and sending the synchronized local clock information. When the master clock in the local setting domain is lost, the local clock information is altered by selecting the clock information of other domains and storing the clock information of other domains so as to realize the clock synchronization of the local setting domain and ensure stable operation of the network.

Description

technical field [0001] The present application relates to a Precision Time Protocol (Precision Time Protocol, PTP), in particular to a method and system for cross-domain clock synchronization based on the PTP protocol. Background technique [0002] In the PTP protocol, the switches in the same domain can use their own clock information to achieve clock synchronization, but the switches cannot use the clock information of other domains to perform clock synchronization in the local setting domain. In the PTP protocol, a domain consists of one or more exchanges that communicate with each other as defined by the protocol. Domains define the scope of PTP messaging, state, data sets, and time stamps. Switches can join multiple domains, but in general the protocol operations and time stamps in different domains are independent of each other. [0003] Due to the interconnection of devices in different domains, the domains will also receive messages from each other. Generally speak...

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Problems solved by technology

[0004] Because switches cannot use clock information in other domains to synchronize clocks in the local configuration domain, once the master clock information in the local configuration domain is lost, the clock synchronization between switches in the local configuration domain will not be possible, and may cause The system is paralyzed, so it is necessary to find a solution to avoid clock synchronization across domains

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