Enterprise Profile for the Precision Time Protocol With Mixed Multicast and Unicast Messages
draft-ietf-tictoc-ptp-enterprise-profile-15

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TICTOC Working Group                                           D. Arnold
Internet-Draft                                               H. Gerstung
Intended status: Standards Track                                Meinberg
Expires: October 6, 2019                                   April 4, 2019

Enterprise Profile for the Precision Time Protocol With Mixed Multicast
                          and Unicast Messages
              draft-ietf-tictoc-ptp-enterprise-profile-15

Abstract

   This document describes a profile for the use of the Precision Time
   Protocol in an IPV4 or IPv6 Enterprise information system
   environment.  The profile uses the End to End Delay Measurement
   Mechanism, allows both multicast and unicast Delay Request and Delay
   Response Messages.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on October 6, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of

Arnold & Gerstung        Expires October 6, 2019                [Page 1]
Internet-Draft         Enterprise Profile for PTP             April 2019

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Technical Terms . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Network Technology  . . . . . . . . . . . . . . . . . . . . .   6
   6.  Time Transfer and Delay Measurement . . . . . . . . . . . . .   7
   7.  Default Message Rates . . . . . . . . . . . . . . . . . . . .   8
   8.  Requirements for Master Clocks  . . . . . . . . . . . . . . .   8
   9.  Requirements for Slave Clocks . . . . . . . . . . . . . . . .   8
   10. Requirements for Transparent Clocks . . . . . . . . . . . . .   9
   11. Requirements for Boundary Clocks  . . . . . . . . . . . . . .   9
   12. Management and Signaling Messages . . . . . . . . . . . . . .   9
   13. Forbidden PTP Options . . . . . . . . . . . . . . . . . . . .  10
   14. Interoperation with IEEE 1588 Default Profile . . . . . . . .  10
   15. Profile Identification  . . . . . . . . . . . . . . . . . . .  10
   16. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   17. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   18. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   19. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     19.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     19.2.  Informative References . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   The Precision Time Protocol ("PTP"), standardized in IEEE 1588, has
   been designed in its first version (IEEE 1588-2002) with the goal to
   minimize configuration on the participating nodes.  Network
   communication was based solely on multicast messages, which unlike
   NTP did not require that a receiving node ("slave clock") in
   IEEE 1588-2008 [IEEE1588] needs to know the identity of the time
   sources in the network (the Master Clocks).

   The "Best Master Clock Algorithm" (IEEE 1588-2008 [IEEE1588]
   Subclause 9.3), a mechanism that all participating PTP nodes must
   follow, set up strict rules for all members of a PTP domain to
   determine which node shall be the active sending time source (Master
   Clock).  Although the multicast communication model has advantages in
   smaller networks, it complicated the application of PTP in larger
   networks, for example in environments like IP based telecommunication
   networks or financial data centers.  It is considered inefficient