Optimization method for time synchronization of PTP in asymmetric network

Abstract

The invention discloses an optimization method for time synchronization of a PTP in an asymmetric network. The method comprises the steps that first equipment and second equipment determine a master-slave relation through a PTP protocol state machine and carry out the interaction, and the second equipment obtains four timestamps from t1 to t4; the first device and the second device carry out master-slave relationship conversion and interaction, and the first device obtains four timestamps t5-t8; and the first device and the second device carry out master-slave relationship conversion again, the first device sends the four timestamps t5-t8 to the second device, the second device calculates time deviation and link delay according to the eight timestamps t1-t8 and carries out verification, and time synchronization is carried out when the verification is passed. By improving the PTP protocol interaction process, two times of master-slave relation conversion are completed in the time synchronization process, and then the accuracy of time synchronization in the asymmetric network is ensured.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to an optimization method and device for PTP time synchronization in an asymmetric network. Background technique [0002] In network communication, the normal operation of business requires network clock synchronization. PTP (Precision Time Protocol, Precision Time Protocol) is often used for high-precision time synchronization between devices. It follows the IEEE1588 protocol and passes the best master clock (BMC, Best Master Clock ) algorithm confirms the most accurate clock, and adopts hardware time stamp to complete second pulse synchronization. [0003] PTP packets generally include a Sync packet (synchronization packet), a Follow_Up packet (following packet), a Delay_req packet (delay request packet) and a Delay_resp packet (delay request response packet). When performing time synchronization, the master clock sends a Sync message to the slave clock, and records...

AI Technical Summary

Problems solved by technology

However, in an asymmetric network, due to reasons such as physical lines, Tms and Tsm are often not equal, that is, the link delay is unbalanced. If the state machine of the existing PTP protocol is run, it will eventually affect the synchronization time accuracy, resulting in time Synchronous variation

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