Re: [Ntp] symmetricom tp1100 stratum and leap indicator behavior

Harlan Stenn <stenn@nwtime.org> Wed, 31 July 2019 22:18 UTC

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To: Andy Harrison <aharrison+ntp@gmail.com>, ntp@ietf.org
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From: Harlan Stenn <stenn@nwtime.org>
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Date: Wed, 31 Jul 2019 15:18:20 -0700
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Subject: Re: [Ntp] symmetricom tp1100 stratum and leap indicator behavior
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Hi Andy,

I don't think this is relevant to the IETF Working Group on NTP.

This is a topic for questions@ntp.org or a support ticket at
bugs.ntp.org.  I'm happy to chat with you about this, too.

H

On 7/31/2019 12:19 PM, Andy Harrison wrote:
> The backstory...  I've been tasked with deploying a pair of Symmetricom
> TP1100 Time Providers with GPS antennae as the official time source for the
> company (replacing an ancient server with a Meinberg card in it).  My
> company actually purchased the Symmetricoms a few years ago, but they never
> got around to putting them in production.  No one was able or willing to
> put in the time to get them going.  I started working at the company
> recently and they gave the project to me.
> 
> I've got them up and running and my test ntp client (my Linux workstation
> running ntp 4.2.8p12) can pull time from them just fine.
> 
> Now for the hard part.  What we want to happen is that if the GPS of the
> primary Symmetricom goes offline, we want the clients to start getting time
> from the backup unit.
> 
> Ideally what would happen is the GPS goes offline, the Symmetricom would
> set itself to a higher stratum level and the clients abandon it for the
> device that has the better stratum, but this is not what happens.
> 
> I had to use Wireshark to see that instead, when the GPS goes offline, the
> Symmetricom stops advertising a stratum level (Wireshark shows "unspecified
> or invalid") while the leap indicator shows "clock unsynchronized" (3 I
> think it was).  (When I enable the GPS again, Wireshark shows the stratum
> level coming through as 1 and leap indicator shows 0 "no warning".)
> 
> On my workstation test client, ntp apparently doesn't know what to do when
> a time source stops indicating its stratum level so it keeps right on
> showing stratum 1 in ntpq output even though Wireshark clearly shows the
> packets coming through with stratum level "unspecified or invalid".
> 
> So, my question is, can I configure ntp in such a way that it responds to
> either a lack of advertised stratum or a leap warning indicator greater
> than 0?
> 
> 
> Thanks!
> 
> 
> 
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-- 
Harlan Stenn <stenn@nwtime.org>;
http://networktimefoundation.org - be a member!