Hello,

I've recently been provided with 4 "highly accurate" ntp servers that
are using GPS as their primary synchronization source. Well, 2 of the
hosts are using GPS (stratum 1) and the other two are syncing to those
(stratum 2). I've been going around configuring all 4 hosts in my
ntp.conf and am starting to notice that my machines are flipping back
and forth between the two stratum 1s. I don't think this is
desirable.

Some of the documentation from the clock vendors suggests that their
clocks are "so accurate" that ntp has a hard time determining which is
more so and this affect can occur. I was thinking of dropping one of
the ST1 clocks from the config and going with 1 ST1 and 2 ST2s....
that seems more stable in a test. I wanted to see if anyone else has
dealt with something similar and how you fixed it.

Thanks.