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Charles, that is true ... some S1 clocks do have restrictions (closed access) or even throttling mechs for the Open Access ones ...... however, to this day I have never had an issue and I have had some pretty large uc deployments using this method. I particularly
love HE servers. Now mind you, I don't point UC apps directly to S1 clocks, I point them to an internal clock that uses an S1 reference (as shown in the drawing). I only use the S1 clocks as references for requests coming from my UC networks. For general data
networks I ensure it uses an S2 or S3 clock or throw it to the wolves with Window server NTP / the pool.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font color="#000000" face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b> cisco-voip <cisco-voip-bounces@puck.nether.net> on behalf of Charles Goldsmith <wokka@justfamily.org><br>
<b>Sent:</b> Monday, May 8, 2017 10:52 AM<br>
<b>To:</b> Haas, Neal<br>
<b>Cc:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] CCX and NTP</font>
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<div dir="ltr">To expand on this, I would point to your voice gateways with everything internal, then the voice gateways would either use an on-prem NTP server that is radio sync'd or one that Neal has advised. That way, everything is synced together with
the same source.
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<div>For UCCX and other apps, I point them to the UCM pub and the pub points to the voice gateways.</div>
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<div>I've seen a lot of people advise for <a href="http://pool.ntp.org">pool.ntp.org</a>, but that has bitten me. How often does an NTP process refresh from DNS? I suspect only on reboot or a restart of the NTP process. I've seen too many NTP servers go
offline when using the pool addresses. Because of that, I've been sticking with .gov based NTP on the voice gateway.</div>
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<div>Ryan Huff, one thing about pointing to strata 1 servers, most of them have restrictions from what I've seen, while they work, they could block you for not being approved if you send too many requests. <a href="http://support.ntp.org/bin/view/Servers/StratumOneTimeServers">http://support.ntp.org/bin/view/Servers/StratumOneTimeServers</a>
has a list, and while many have open access listed, if you look at the details, they can still have restrictions.</div>
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<div>Just food for thought.</div>
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<div class="gmail_quote">On Mon, May 8, 2017 at 9:20 AM, Haas, Neal <span dir="ltr">
<<a href="mailto:nhaas@co.fresno.ca.us" target="_blank">nhaas@co.fresno.ca.us</a>></span> wrote:<br>
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<p class="MsoNormal"><a name="m_5908957790101886209__MailEndCompose"><span style="color:#1f497d">Get an on-prem NTP server, if you cant spend the money, use:<u></u><u></u></span></a></p>
<p class="MsoNormal"><span><span style="color:#1f497d"><u></u> <u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d"><a href="http://time.nist.gov" target="_blank">time.nist.gov</a> global address for all servers Multiple locations<u></u><u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d"><a href="http://utcnist.colorado.edu" target="_blank">utcnist.colorado.edu</a> 128.138.140.44 University of Colorado, Boulder<u></u><u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d"><a href="http://utcnist2.colorado.edu" target="_blank">utcnist2.colorado.edu</a> 128.138.141.172 University of Colorado, Boulder<u></u><u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d"><a href="http://time-nw.nist.gov" target="_blank">time-nw.nist.gov</a> 131.107.13.100 Microsoft, Redmond, Washington<u></u><u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d"><u></u> <u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d">Really, anything with a GOV, or EDU should be good.<u></u><u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d"><u></u> <u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d">By the way, you should NEVER, EVER, EVER (can’t stress this enough) a Windows Based NTP. Every place that I have went into and removed a Windows Time server, everything has worked better! Windows just
cant do time. I went into a business with windows NTP, and the guy was checking time from about 100 NTP servers, his time was off by three minutes. Took it down to 3 and everything started to work.<u></u><u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d"><u></u> <u></u></span></span></p>
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<p class="MsoNormal"><span><span style="color:#1f497d">Thank You,<u></u><u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d"><u></u> <u></u></span></span></p>
<p class="MsoNormal"><span><span style="color:#1f497d">Neal Haas<u></u><u></u></span></span></p>
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<p class="MsoNormal"><span><span style="color:#1f497d"><u></u> <u></u></span></span></p>
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<p class="MsoNormal"><b>From:</b> cisco-voip [mailto:<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@<wbr>puck.nether.net</a>]
<b>On Behalf Of </b>Ben Amick<br>
<b>Sent:</b> Monday, May 8, 2017 7:12 AM<br>
<b>To:</b> <a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br>
<b>Subject:</b> [cisco-voip] CCX and NTP<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size:12.0pt">What do you guys use for NTP on your CCX hosts? I’ve been informed by TAC that “CCX does not support Windows based NTP” so I was thinking about just pointing NTP towards my CCM hosts – is that a valid scenario?
I figure that since CCM is pretty much authoritative on everything for CCX as it is it wouldn’t be a problem?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt; font-family:"Garamond",serif"><u></u> <u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt; font-family:"Garamond",serif; color:#3b3838">Ben Amick<u></u><u></u></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt; font-family:"Garamond",serif; color:#3b3838">Telecom Analyst</span><span style="font-size:9.0pt; font-family:"Garamond",serif; color:#666666"><u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman",serif"><br>
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