Michael Moroney wrote:
David Woolley <[email protected]> writes:
Michael Moroney wrote:
that synchronizes with the four clocks, and ntpq> peers shows one of the
primaries with a "*" in the first column meaning it was synchronized to as
time source, the other 3 show "+" as expected, meaning they are usable
sources. We disconnect the antenna of the selected clock. As expected
* and + mean they are used, not just that they are usable. The time
used to discipline the clock is a weighted average of all of them.
If it uses all of them, what is the difference between "*" and "+"?
It still doesn't explain why the disconnected clock doesn't get dropped.
"*" designates the primary source of time. "+" designates an "advisory"
source. It's available for use if something happens to the primary
source.
See Dave Mills' book on NTP, and RFC-1305. RFC-1305 is for V3 of NTP.
There's an RFC in preparation for V4 but as of the last time I heard it
was being written by a committee and may be released sometime in the
next decade!
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