[ntp:questions] Client doesn't drop failed source

Michael Moroney moroney at world.std.spaamtrap.com
Sat Jan 9 02:32:52 UTC 2010


David Woolley <david at ex.djwhome.demon.invalid> 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.

>> the clock (Spectracom) changes its stratum from 1 to 16 after a delay, and

>If it remains the best choice it could take up to 8192 seconds before 
>all the samples are flushed from the FIFO and it becomes completely 
>ineligible.  There is logic to discourage early switching, as clock 
>hopping is, itself, considered a bad thing.

OK, is 8192 the default time before a nonresponsive host gets dropped?




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