The administrative timing source for the system. This variable is used
to select the desired timing source to be either primary, secondary or
tertiary. Setting this variable will cause the system to change to the
specified timing source, provided it is currently available. Setting
this value to error(4) is not allowed.
The system periodically monitors the status of the three timing sources.
If the systems current timing source fails, the system will
automatically downgrade to the next timing source. If the system is
configured to automatically upgrade (juniSystemTimingAutoUpgrade is set
to enable(1)) the system will switch back to the timing source indicated
by this variable when it becomes available.
A timing source failure can be detected by comparing the operational and
administrative timing sources. If they are not equal, the system has
swapped timing sources because the administratively set timing source is
in the error state.