Operation Manual – NTPH3C S3610&S5510 Series Ethernet Switches Chapter 1 NTP Configuration1-5server; 5 – broadcast or multicast; 6 – NTP control message; 7 – reserved forprivate use.z Stratum: an 8-bit integer indicating the stratum level of the local clock, with thevalue ranging from 1 to 16. The clock precision decreases from stratum 1 throughstratum 16. A stratum 1 clock has the highest precision, and a stratum 16 clock isnot synchronized and cannot be used as a reference clock.z Poll: 8-bit signed integer indicating the poll interval, namely the maximum intervalbetween successive messages.z Precision: an 8-bit signed integer indicating the precision of the local clock.z Root Delay: roundtrip delay to the primary reference source.z Root Dispersion: the maximum error of the local clock relative to the primaryreference source.z Reference Identifier: Identifier of the particular reference source.z Reference Timestamp: the local time at which the local clock was last set orcorrected.z Originate Timestamp: the local time at which the request departed the client for theservice host.z Receive Timestamp: the local time at which the request arrived at the service host.z Transmit Timestamp: the local time at which the reply departed the service host forthe client.z Authenticator: authentication information.1.1.4 Operation Modes of NTPDevices running NTP can implement clock synchronization in one of the followingmodes:I. Server/client modeFigure 1-3 Server/client modeWhen working in the server/client mode, a client sends a clock synchronizationmessage to servers, with the Mode field in the message set to 3 (client mode). Uponreceiving the message, the servers automatically work in the server mode and send areply, with the Mode field in the messages set to 4 (server mode). Upon receiving the
