David,
When a server loses all sources, its own indicators reveal that.
However, the only way downstream clients see this is increasing
dispersion. Depending on other available sources a client has no way to
know (or care) about that other than increasing maximum error. If no
other sources are available, a client may well cling to that server, as
by design it <continues> to provide service within the maximum error
statistic.
Dave
David Woolley wrote:
David Mills wrote:
goofyzig,
This issue is widely misunderstood; yours is the second such message
to me today. So, please spread the word.
When a server loses all sources it does not necessarily become
unsuitable for downstream clients. Ordinarily, it inherits error
statistics from upstream servers and provides them to downstream
clients. Servers and clients use these statistics to calculate the
Whilst it may make sense to retain the system peer status, I don't see
that it makes sense to retain the selected status. As system peer
currently also includes selected, maybe there is a need to split
system peer from its selected implication.
maximum error statistic which represents the maximum clock error
relative to the primary reference clock. See the error budget called
out in the specification. Once determined, the maximum error
increases at a rate (15 PPM) determined as the maximum disciplined
clock frequency error of the server clock. This increase continues
indefinitely or until the sources are again found.
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