[ntpwg] SNTP and NTP servers

[David L. Mills]

Danny,

The NTP specification defines primary servers, secondary servers and 
clients. Primary servers are synchronized to reference clocks and 
conform to the SNTP or NTP specification, which is the same. SNTP 
clients can synchronize to primary or secondary servers, but cannot 
offer synchronization to clients of their own. Secondary servers can 
import time from primary or secondary servers and provide time to 
dependent clients. Only they must provide the mitigation and discipline 
algorithms. This is to avoid possible whiplash or other suboptimal 
behavior. If you have alternate discriptions or verbage about the 
specification prose, I would be happy to hear it.

Dave

Danny Mayer wrote:

> Just to clarify, SNTP clients can use both NTP Servers and SNTP Servers
> while SNTP servers cannot be used for NTP clients unless the have a
> refclock attached. Yes this a bit confusing but it is described in the
> current NTPv4 draft. See Section 14 of the draft. The SNTP packets are
> the same as the NTP packets.
>
> Danny
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