运营商级SD-WAN组网NTP时钟同步方案  

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

作　　者：赵乾艮 王羽 汤凌 颜永明[1] ZHAO Qiangen;WANG Yu;TANG Ling;YAN Yongming(Shanghai Branch of China Telecom Co.,Ltd.,Shanghai 200085,China)

机构地区：[1]中国电信股份有限公司上海分公司,上海200085

出　　处：《电信科学》2022年第8期171-177,共7页Telecommunications Science

摘　　要：SD-WAN发展势头迅猛,电信运营商与互联网企业都在不断扩大布局。作为形态多样化的技术,SD-WAN中并未对时钟同步做出明确规范。分析了时钟同步对SD-WAN技术实现和业务运行的重要性。简述了在SD-WAN被广泛采用的互联网公共NTP服务时钟同步方案的利弊,由此展开讨论在不同场景可实现的自建NTP服务时钟同步方案,并设计了基于自建NTP服务利用管理隧道加密传输NTP同步数据的时钟同步方法,使SD-WAN平台和设备在时间同步时获得更高的安全性与稳定性。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 synchroniza-tion.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 ser-vice 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.

关 键 词：SD-WAN 时钟同步 IPSec隧道 DTLS隧道 

分 类 号：TP393.2[自动化与计算机技术—计算机应用技术]