[TICTOC]Re: Warren Kumari's No Objection on draft-ietf-tictoc-ptp-enterprise-profile-26: (with COMMENT)

[Doug Arnold <[e-mail]>]

Hello Warren,


That’s a tough one.  In section 5 I state: “IPv4 and IPv6 instances in the same network node MUST operate in different PTP Domains.”  I am reluctant to take this further as IEEE 1588 hasn’t addressed it.  One might be tempted to treat a dual stack as two ports to the same PTP instance. But that would be a problem for PTP timeTransmitters and timeReceivers which are specifically defined as one port clocks, with one protocol address.


I am not sure what happens in real implementations if a single Ethernet port had a dual stack, with two PTP instances, one in each version of IP. Do they receive each other's messages and react to them as if it were two different PTP nodes?  Is there a use case where someone wants them to, or wants them not to?  I really don’t know at this time, and since no one requested either behavior I retreated to safety and kept them in different domains.


Regards,

Doug

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Subject: Warren Kumari's No Objection on draft-ietf-tictoc-ptp-enterprise-profile-26: (with COMMENT)

Warren Kumari has entered the following ballot position for
draft-ietf-tictoc-ptp-enterprise-profile-26: No Objection

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COMMENT:
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Thank you very much for writing this document - I found it an interesting read.

Also, much thanks to Tim Chown for their excellent Ops-Dir review
(https://datatracker.ietf.org/doc/review-ietf-tictoc-ptp-enterprise-profile-24-opsdir-lc-chown-2024-03-07/)
and to the authors for addressing the comments; I think that there is still one
remaining unaddressed comment ("In practice, would PTP operate over just one or
the other, or might messages be duplicated in each protocol?  How does the
profile look for a dual-stack environment?").