H3C Technologies H3C S7500E Series Switches - Manual (Page 68)

3-4
Figure 3-2 Clock synchronization message format
Main fields are described as follows:
z LI: 2-bit leap indicator. When set to 11, it warns of an alarm condition (clock
unsynchronized); when set to any other value, it is not to be processed by NTP.
z VN: 3-bit version number, indicating the version of NTP. The latest version is version 3.
z Mode: a 3-bit code indicating the work mode of NTP. This field can be set to these values: 0
– reserved; 1 – symmetric active; 2 – symmetric passive; 3 – client; 4 – server; 5 –
broadcast or multicast; 6 – NTP control message; 7 – reserved for private use.
z Stratum: an 8-bit integer indicating the stratum level of the local clock, with the value
ranging from 1 to 16. The clock precision decreases from stratum 1 through stratum 16. A
stratum 1 clock has the highest precision, and a stratum 16 clock is not synchronized and
cannot be used as a reference clock.
z Poll: 8-bit signed integer indicating the poll interval, namely the maximum interval between
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 primary reference
source.
z Reference Identifier: Identifier of the particular reference source.
z Reference Timestamp: the local time at which the local clock was last set or corrected.
z Originate Timestamp: the local time at which the request departed from the client for the
service 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 from the service host for
the client.