Guidelines for Defining Packet Timestamps
draft-ietf-ntp-packet-timestamps-09

Document Type Active Internet-Draft (ntp WG)
Last updated 2020-04-17 (latest revision 2020-03-11)
Replaces draft-mizrahi-intarea-packet-timestamps
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NTP Working Group                                             T. Mizrahi
Internet-Draft                               Huawei Smart Platforms iLab
Intended status: Informational                                 J. Fabini
Expires: September 12, 2020                                      TU Wien
                                                               A. Morton
                                                               AT&T Labs
                                                          March 11, 2020

               Guidelines for Defining Packet Timestamps
                  draft-ietf-ntp-packet-timestamps-09

Abstract

   Various network protocols make use of binary-encoded timestamps that
   are incorporated in the protocol packet format, referred to as packet
   timestamps for short.  This document specifies guidelines for
   defining packet timestamp formats in networking protocols at various
   layers.  It also presents three recommended timestamp formats.  The
   target audience of this document includes network protocol designers.
   It is expected that a new network protocol that requires a packet
   timestamp will, in most cases, use one of the recommended timestamp
   formats.  If none of the recommended formats fits the protocol
   requirements, the new protocol specification should specify the
   format of the packet timestamp according to the guidelines in this
   document.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 12, 2020.

Mizrahi, et al.        Expires September 12, 2020               [Page 1]
Internet-Draft              Packet Timestamps                 March 2020

Copyright Notice

   Copyright (c) 2020 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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Background  . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Scope of this Document  . . . . . . . . . . . . . . . . .   3
     1.3.  How to Use This Document  . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     2.2.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  Terms used in this Document . . . . . . . . . . . . . . .   4
   3.  Packet Timestamp Specification Template . . . . . . . . . . .   5
   4.  Recommended Timestamp Formats . . . . . . . . . . . . . . . .   6
     4.1.  Using a Recommended Timestamp Format  . . . . . . . . . .   7
     4.2.  NTP Timestamp Formats . . . . . . . . . . . . . . . . . .   7
       4.2.1.  NTP 64-bit Timestamp Format . . . . . . . . . . . . .   7
       4.2.2.  NTP 32-bit Timestamp Format . . . . . . . . . . . . .   9
     4.3.  The PTP Truncated Timestamp Format  . . . . . . . . . . .  10
   5.  Synchronization Aspects . . . . . . . . . . . . . . . . . . .  11
   6.  Timestamp Use Cases . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  Example 1 . . . . . . . . . . . . . . . . . . . . . . . .  13
     6.2.  Example 2 . . . . . . . . . . . . . . . . . . . . . . . .  14
   7.  Packet Timestamp Control Field  . . . . . . . . . . . . . . .  14
     7.1.  High-level Control Field Requirements . . . . . . . . . .  15
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  17
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  17
     11.2.  Informative References . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  19
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