System Management Parameters
Page 154 7210 SAS M, X Basic System Configuration Guide
• In order to avoid the generation of too many events/trap the NTP module will rate limit the
generation of events/traps to three per second. At that point a single trap will be generated
that indicates that event/trap squashing is taking place.
SNTP Time Synchronization
For synchronizing the system clock with outside time sources, the 7210 SAS MOS software
includes a Simple Network Time Protocol (SNTP) client. As defined in RFC 2030, SNTP Version
4 is an adaptation of the Network Time Protocol (NTP). SNTP typically provides time accuracy
within 100 milliseconds of the time source. SNTP can only receive the time from NTP servers; it
cannot be used to provide time services to other systems. SNTP is a compact, client-only version
of NTP. SNTP does not authenticate traffic.
SNTP can be configured in both unicast client modes (point-to-point) and broadcast client modes
(point-to-multipoint). SNTP should be used only at the extremities of the synchronization subnet.
SNTP clients should operate only at the highest stratum (leaves) of the subnet and in
configurations where no NTP or SNTP client is dependent on another SNTP client for
synchronization. SNTP time servers should operate only at the root (stratum 1) of the subnet and
then only in configurations where no other source of synchronization other than a reliable radio
clock is available.
In the 7210 SAS MOS software, the SNTP client can be configured for either broadcast or unicast
client mode.
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