Synchronizing the system time in the network
9.2
SNTP
109
UM Config GRS
Release
8.0
09/2019
9.2
SNTP
The Simple Network Time Protocol (SNTP) lets you synchronize the system time in your network.
The device supports the SNTP client and the SNTP server function.
The SNTP server makes the UTC (Universal Time Coordinated) available. UTC is the time relating
to the coordinated world time measurement. The UTC is the same worldwide and ignores local time
shifts.
SNTP is a simplified version of NTP (Network Time Protocol). The data packets are identical with
SNTP and NTP. Accordingly, both NTP and SNTP servers serve as a time source for SNTP clients.
Note:
Statements in this chapter relating to external SNTP servers also apply to NTP servers.
SNTP knows the following operation modes for the transmission of time:
Unicast
In Unicast operation mode, an SNTP client sends requests to an SNTP server and expects a
response from this server.
Broadcast
In Broadcast operation mode, an SNTP server sends SNTP messages to the network in
specified intervals. SNTP clients receive these SNTP messages and evaluate them.
Note:
An SNTP server in Broadcast operation mode also responds to direct requests using Unicast
from SNTP clients. In contrast, SNTP clients work in either Unicast or Broadcast operation mode.
Table 15: Target address classes for Broadcast operation mode
IP destination address
Send SNTP packets to
0.0.0.0
Nobody
224.0.1.1
Multicast address for SNTP messages
255.255.255.255
Broadcast address
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