Miroslav Lichvar 5a92dbe784 sources: add support for orphan sources ...

When the local reference is configured with the orphan option, NTP
sources that have stratum equal to the configured local stratum are
considered to be orphans (i.e. serving local time while not being
synchronised with real time) and are excluded from the normal source
selection. Sources with stratum larger than the local stratum are
considered to be directly on indirectly synchronised to an orphan and
are always ignored.

If no selectable source is available and all orphan sources have
reference IDs larger than the local ID, no source will be selected and
the local reference mode will be activated at some point, i.e. this host
will become an orphan. Otherwise, the orphan source with the smallest
reference ID will be selected. This ensures a group of servers polling
each other (with the same orphan configuration) which have no external
source can settle down to a state where only one server is serving its
local unsychronised time and others are synchronised to it.

2016-03-31 16:08:49 +02:00

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