![]() ![]() Labnario2 router to be the NTP Client of labnario1.Labnario1 router to be the NTP Server with the stratum being 2.So the stratum level simply defines its distance from the reference clock. A stratum-3 server gets its time via NTP from stratum-2 server, and so on. ![]() Thus, a stratum-2 server gets its time via NTP protocol from a stratum-1 server. Stratum-2 server is connected to the stratum-1 server over a network path. The reference clock typically synchronizes to the correct time (UTC) using GPS, Irig-B, etc.ĭevices which are directly connected (usually via RS-232, not over a network path) to the stratum-0 servers are called stratum-1 servers. These are usually atomic clocks which has little or no delay associated with it. It is important to remember that NTP uses hierarchical system of levels of clock sources, which is called a stratum.Īt the top of this hierarchy we have a stratum-0 devices, which act as a reference clocks. NTP can be a very useful tool especially, when we want to correlate issues during network failures. Because it was designed to operate in variable-latency environment, NTP can achieve up to 1 millisecond accuracy in local area networks and tens of milliseconds when running over the Internet. It is used for clock synchronization between computer systems over packet-switched data networks. Network Time Protocol ( NTP) is one of the oldest Internet protocols.
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