Telecommunications Science ›› 2022, Vol. 38 ›› Issue (8): 171-177.doi: 10.11959/j.issn.1000-0801.2022092

• Engineering and Application • Previous Articles     Next Articles

Carrier-grade NTP clock synchronization scheme of SD-WAN network

Qiangen ZHAO, Yu WANG, Ling TANG, Yongming YAN   

  1. Shanghai Branch of China Telecom Co., Ltd., Shanghai 200085, China
  • Revised:2022-04-06 Online:2022-08-20 Published:2022-08-01

Abstract:

SD-WAN is developing rapidly, and telecom operators and Internet companies are constantly expanding their layout.As a technology with diverse forms, SD-WAN has not made a clear specification for clock synchronization.The importance of clock synchronization to SD-WAN technology implementation and business running was analyzed.The advantages and disadvantages of the clock synchronization scheme of Internet public NTP service widely used in SD-WAN realizations were sketched.Thus the clock synchronization scheme of self-built NTP service in different scenarios was discussed.Furthermore, a clock synchronization method using management tunnel to transmit encrypted NTP synchronization data was designed, which made SD-WAN platform and devices obtain higher security and stability in time synchronization.

Key words: SD-WAN, time synchronization, IPSec tunnel, DTLS tunnel

CLC Number: 

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