Support of the IEEE 1588 Timestamp Format in a Two-Way Active Measurement Protocol (TWAMP) (RFC8186)
Original Publication Date: 2017-Jun-01
Included in the Prior Art Database: 2017-Jun-09
Internet Society Requests For Comment (RFCs)
G. Mirsky: AUTHOR [+2]
The One-Way Active Measurement Protocol (OWAMP) [RFC4656] defines that only the NTP format [RFC5905] of a timestamp can be used in the OWAMP-Test protocol. The Two-Way Active Measurement Protocol (TWAMP) [RFC5357] adopted the OWAMP-Test packet format and extended it by adding a format for a reflected test packet. Both the sender's and reflector's packets timestamps are expected to follow the 64-bit-long NTP format [RFC5905]. NTP, when used over the Internet, typically achieves clock accuracy within 5 ms to 100 ms. Surveys conducted recently suggest that 90% of devices achieve accuracy better than 100 ms and 99% of devices achieve accuracy better than 1 sec. It should be noted that NTP synchronizes clocks on the control plane, not on data plane. Distribution of clock within a node may be supported by an independent NTP domain or via interprocess communication in a multiprocessor distributed system. Any of the mentioned solutions will be subject to additional queuing delays that negatively affect data-plane clock accuracy.
Internet Engineering Task Force (IETF) G. Mirsky Request for Comments: 8186 ZTE Corp. Category: Standards Track I. Meilik ISSN: 2070-1721 Broadcom June 2017
Support of the IEEE 1588 Timestamp Format in a Two-Way Active Measurement Protocol (TWAMP)
This document describes an OPTIONAL feature for active performance measurement protocols that allows use of the Precision Time Protocol timestamp format defined in IEEE 1588v2, as an alternative to the Network Time Protocol that is currently used.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc8186.
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Mirsky & Meilik Standards Track [Page 1]
RFC 8186 1588 Timestamp Format in TWAMP June 2017
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Conventions Used in This Document . . . . . . . . . . . . 3
1.1.1. Terminology . . . . . . . . . . . . . . . . . . . . . 3
1.1.2. Requirements Language . . . . . . . . . . . . . . . . 3
2. OWAMP and TWAMP Extensions . . . . . . . . . . . . . . . . . 3
2.1. Timestamp Format Negot...