A method and device for realizing optimal master clock algorithm

Abstract

The invention discloses a method and a device for realizing a best master clock algorithm. The method comprises the following steps of: firstly comparing whether clock ids (identifications) of an external clock and a local clock are the same when comparing clock data sets; if clock ids are different, then comparing the clock performances of the external clock and the local clock; if the clock performances of the external clock and the local clock are consistent, determining whether to enter a multiple GM (grand master clock) mode; and if determining to enter the multiple GM mode, comparing hop counts of two clock data sets. When the hop counts are unequal, the data set with less hop count is better than the data set with larger hop count, and when the hop counts are equal, a better data set is determined by comparing clock ids or random selection. By utilizing the method and the device, survival of a plurality of GM clocks with the same clock performance in a domain is realized, and load can be reasonably distributed according to a shortest hop count manner.

Description

technical field [0001] The invention relates to the technical field of clock synchronization communication networks, in particular to a method and device for realizing an optimal master clock algorithm. Background technique [0002] With 3G (The 3 rd Generation, the third generation of mobile communication technology) the rapid development of the network, the PTP time synchronization protocol has been paid more and more attention and widely used in the communication network. Domestic and foreign operators continue to use the Precision Time Synchronization Protocol (Precision Time Protocol, PTP for short) for time synchronization, and gradually replace the method of using GPS (Global Positioning System, Global Positioning System) for time synchronization. [0003] In the IEEE 1588V2 protocol, under the multicast networking, the network topology is controlled through the BMC algorithm (Best MasterClock Algorithm, best master clock algorithm). The standard BMC algorithm come...

AI Technical Summary

Problems solved by technology

In the standard BMC algorithm, the active GM clock will carry loads as much as possible (as long as these loads can directly or indirectly see the active GM), and this makes the standby GM unable to function, and can only fail when the active GM It will assume the role of its GM, which leads to excessive load around the active GM, too many hops, and poor performance of clock recovery; moreover, when the network performs active-standby GM switchover, all loads need to be Switching caused large-scale turbulence in the network and introduced time jitter

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