Operation Modes Of Ntp - H3C S5500-EI series Operation Manual

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Operation Manual – NTP

H3C S5500-EI Series Ethernet Switches

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.

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.

Poll: 8-bit signed integer indicating the poll interval, namely the maximum interval

between successive messages.

Precision: an 8-bit signed integer indicating the precision of the local clock.

Root Delay: roundtrip delay to the primary reference source.

Root Dispersion: the maximum error of the local clock relative to the primary

reference source.

Reference Identifier: Identifier of the particular reference source.

Reference Timestamp: the local time at which the local clock was last set or

Originate Timestamp: the local time at which the request departed the client for the

service host.

Receive Timestamp: the local time at which the request arrived at the service host.

Transmit Timestamp: the local time at which the reply departed the service host for

Authenticator: authentication information.

1.1.4 Operation Modes of NTP

Switches running NTP can implement clock synchronization in one of the following

I. Server/client mode

Figure 1-3 Server/client mode

When working in the server/client mode, a client sends a clock synchronization

message to servers, with the Mode field in the message set to 3 (client mode). Upon

Chapter 1 NTP Configuration

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