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Re: [TICTOC] Enterprise profile update

"Laurent Montini (lmontini)" <lmontini@cisco.com> Wed, 09 April 2014 07:31 UTC

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From: "Laurent Montini (lmontini)" <lmontini@cisco.com>
To: Richard Cochran <richardcochran@gmail.com>, Wojciech Owczarek <wojciech@owczarek.co.uk>
Thread-Topic: [TICTOC] Enterprise profile update
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Date: Wed, 09 Apr 2014 07:31:23 +0000
Message-ID: <CF6ABF23.74F1C%lmontini@cisco.com>
References: <CACQYgzE106JaKArgc=3HKkKcrdvSy5PmK-A0=_ZMdfrFUJbrtQ@mail.gmail.com> <20140405112034.GM22106@netboy> <20140405133748.GB4566@netboy> <CALw1_Q3hNRNpHzQ=1z0XRTqvcvm2W7=Gm_ZWa2UJT-BqYTvmZw@mail.gmail.com> <CF68E7A8.7488B%lmontini@cisco.com> <1D3F6A7C-AD27-4A63-9F63-41D9929AE285@owczarek.co.uk> <20140408144527.GA5087@netboy> <CAHyFsxmfCsJtP4+PwKyRciPHBQuZw9ONDBPtOkBSqup1P2z_Rw@mail.gmail.com> <20140409051116.GA4520@netboy>
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Cc: "tictoc@ietf.org" <tictoc@ietf.org>
Subject: Re: [TICTOC] Enterprise profile update
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Richard,

> Well, if it is a "de facto" standard, then it does mean something. It
> means that 16.1 is not really used or even implemented, in which case,
> it should be removed from the next edition of 1588.



16.1 is utilized by ITU-T G.8265.1.
A telecom slave can set ptp communication path and can communicate with
multiple GMs particularly for backup reason.
A slave can negotiate the message interval (e.g. related to network PDV
expectation) and the GM can refuse a grant (e.g., when running out of
resource.
Utilization of negotiated IP unicast avoids having all PTP comm path to be
constantly up & running (as would be the case with static config).

I don¹t think IEEE 1588-2008 prevents setting an IP unicast path
statically if preferred.
Note negotiation could allow a slave to request low message interval for
fast stabilization (burst mode) then ask to lower rate when in steady
state.

Thanks,
Laurent

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