Re: [v6ops] Fw: New Version Notification for draft-elkins-6man-ipv6-pdm-dest-option-04.txt

Cutler James R <james.cutler@consultant.com> Mon, 28 October 2013 16:58 UTC

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From: Cutler James R <james.cutler@consultant.com>
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Date: Mon, 28 Oct 2013 12:57:36 -0400
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To: "Ackermann, Michael" <MAckermann@bcbsm.com>
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Cc: Ray Hunter <v6ops@globis.net>, v6ops WG <v6ops@ietf.org>, 6man WG <ipv6@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
Subject: Re: [v6ops] Fw: New Version Notification for draft-elkins-6man-ipv6-pdm-dest-option-04.txt
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On Oct 28, 2013, at 12:13 PM, Ackermann, Michael <MAckermann@bcbsm.com> wrote:

> Hey Ray
> 
> It appears your experiences with Time Synch and Stratum levels are different than mine.   In the older Telecom and Voice World Stratum was a great indicator of clocking accuracy.   Still is as far as I know.   This was always true with or without NTP in the picture.   
> And whenever we had two Stratum 0's or 1's, be they the same or different masters, they WOULD be in synch.   We never had a situation that was an exception to that, with or without NTP.  
> 
> Thanks
> 
> Mike

Before getting too deep into this particular argument, it would be good to review documents at http://www.eecis.udel.edu/~mills/ntp.html and ntp.org.  

When discussion time synchronization using NTP, stratum refers to the distance from reference clock.  Accuracy is separately a function of reference clock and there are many variants of reference clock.  That two systems are “in synch” is the magic of NTP algorithms and is orthogonal to accuracy.

James R. Cutler
james.cutler@consultant.com