![]() ![]() SNTP should be used only at the extremities of the synchronization subnet. SNTP can be configured in both unicast client modes (point-to-point) and broadcast client modes (point-to-multipoint). ![]() ![]() SNTP is a compact, client-only version of NTP. SNTP can only receive the time from NTP servers it cannot be used to provide time services to other systems. SNTP typically provides time accuracy within 100 milliseconds of the time source. As defined in RFC 2030, SNTP Version 4 is an adaptation of the Network Time Protocol (NTP). The following NTP elements are supported:įor synchronizing the system clock with outside time sources, the SR OS includes a Simple Network Time Protocol (SNTP) client. Activation of the PTP source into NTP may impact the network NTP topology. In this latter case, the local PTP source appears as a stratum 0 server and the SR OS advertises itself as a stratum 1 server. However, the SR OS also allows for the use of the local PTP recovered time to be a source into NTP. The router relies on an external stratum 1 server to source accurate time into the network. SR OS routers will normally operate as a stratum 2 or higher device. A stratum-3 server receives its time over a network link from a stratum-2 server. The higher stratum levels are separated from the stratum-1 server over a network path, thus, a stratum-2 server receives its time over a network link from a stratum-1 server. A stratum-1 server is an NTP server with a directly-connected device that provides Coordinated Universal Time (UTC), such as a GPS or atomic clock. However, they can be directly connected to devices that operate as stratum-1 servers. Stratum-0 servers cannot be used in a network. The reference clock is considered to be a stratum-0 device that is assumed to be accurate with little or no delay. NTP uses stratum levels to define the number of hops from a reference clock. It allows for the participating network nodes to keep time more accurately and more importantly they can maintain time in a more synchronized fashion between all participating network nodes. NTP is the Network Time Protocol defined in RFC 1305, Network Time Protocol (Version 3) Specification, Implementation and Analysis and RFC 5905, Network Time Protocol Version 4: Protocol and Algorithms Specification. Either as EST or EDT, depending on place and time of yearĮither as CST or CDT, depending on place and time of yearĮither as MST or MDT, depending on place and time of yearĮither as PST or PDT, depending on place and time of yearĮastern Standard/Summer Time (e.g., Canberra) ![]()
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