Sntp Time Synchronization - Nokia 7210 Configuration Manual

7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
6.1.2.3
To synchronize the system clock with outside time sources, the 7210 SAS devices
include a Simple Network Time Protocol (SNTP) client. As defined in RFC 2030,
SNTP Version 4 is an adaptation of NTP. SNTP typically provides time accuracy
within 100 ms 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.
In the 7210 SAS software, the SNTP client 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.
3HE 17358 AAAB TQZZA
When none of the configured servers are reachable on the node, the system
reverts to manual timekeeping and issues a critical alarm. When a server
becomes available, a trap is issued indicating that standard operation has
resumed.
• NTP and SNTP
If both NTP and SNTP are enabled on the node, SNTP transitions to an
operationally down state. If NTP is removed from the configuration or shut down,
SNTP resumes an operationally up state.
• gradual clock adjustment
Because several applications (such as Service Assurance Agent (SAA)) can use
the clock, if a major adjustment (128 ms or more) is needed, it is performed by
programmatically stepping the clock. If a minor (less than 128 ms) adjustment is
needed, it is performed by either speeding up or slowing down the clock.
• rate limit events and traps
To avoid the generation of excessive events and traps the NTP module rate
limits the generation of events and traps to three per second. At that point, a
single trap is generated to indicate that event and trap squashing is taking place.

SNTP Time Synchronization

Use subject to Terms available at: www.nokia.com
© 2021 Nokia.
System Management
255