[ntp:questions] symmetricom tp1100 stratum and leap indicator behavior

Miroslav Lichvar mlichvar at redhat.com
Mon Aug 5 09:47:33 UTC 2019


On 2019-08-02, Andrew Harrison <aharrison at gmail.com> wrote:
> I should also have clarified, I understand patience is required.  I
> was careful not to rush through these troubleshooting steps because I
> know these changes take time.  At this point, I'm right at the last
> step where I mentioned I had again unplugged the GPS antenna.  This
> was three days ago and the Symmetricom with no GPS that is not
> reporting a stratum level is still primary.

That's odd. When a source becomes unsynchronized (stratum == 16 or leap
== 3), the reachability should drop to 0 after 8 polls and ntpd should
select another source, even if the source was specified with the
"prefer" options. Can you please post a tcpdump output showing the
server responses and output of "ntpq -c as -c rv &1" command?

> remote           refid       st t when poll reach   delay   offset  jitter
>==============================================================================
> *172.99.99.100   .GPS.        1 u   83  256  377    2.924    0.010   0.185
> -172.99.99.200   .GPS.        1 u   31  256  377    3.978    0.165   2.811
> +10.99.99.100    .GPSi.       1 u   12  256  377    1.465   -0.125   0.110
> +10.99.99.200    10.99.99.100 2 u   55  256  377    2.238   -0.015   0.107


-- 
Miroslav Lichvar



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