+7(495) 797-3311 www.qtech.ruМосква, Новозаводская ул., 18, стр. 1382Chapter 56 SNTP Configuration56.1 Introduction to SNTPThe Network Time Protocol (NTP) is widely used for clock synchronization for globalcomputers connected to the Internet. NTP can assess packet sending/receiving delay in thenetwork, and estimate the computer’s clock deviation independently, so as to achieve highaccuracy in network computer clocking. In most positions, NTP can provide accuracy from 1 to50ms according to the characteristics of the synchronization source and network route.Simple Network Time Protocol (SNTP) is the simplified version of NTP, removing the complexalgorithm of NTP. SNTP is used for hosts who do not require full NTP functions; it is a subsetof NTP. It is common practice to synchronize the clocks of several hosts in local area networkwith other NTP hosts through the Internet, and use those hosts to provide time synchronizationservice for other clients in LAN. The figure below depicts a NTP/SNTP application networktopology, where SNTP mainly works between second level servers and various terminals sincesuch scenarios do not require very high time accuracy, and the accuracy of SNTP (1 to 50 ms)is usually sufficient for those services.Working ScenarioSwitch implements SNTPv4 and supports SNTP client unicast as described in RFC2030;SNTP client multicast and unicast are not supported, nor is the SNTP server function.
