Is there a way to configure ntpd to ignore a particular clock unless
there is no other choice? What I'm thinking is to ignore the GPS
receiver NMEA data and use only the PPS plus Internet servers for most
of the synchronization. But if the Internet servers go down, accept the
GPS NMEA data for seconds numbering and let the tick be controlled by PPS.
I guess I'm asking for something opposite to the "prefer" flag, a "not
unless you have to" flag. The GPS does get selected among the various
clock sources but it's the worst of the bunch with respect to jitter and
offset. Those two wander all over while the rest of the Internet
servers and the PPS are stable. It is almost never rejected as an
outlier or false ticker even if it's way out of line with the other sources.
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