A One-Way Delay Metric for IPPM
draft-morton-ippm-2679-bis-01

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Network Working Group                                           G. Almes
Internet-Draft                                                 Texas A&M
Obsoletes: 2679 (if approved)                               S. Kalidindi
Intended status: Standards Track                                    Ixia
Expires: April 24, 2013                                     M. Zekauskas
                                                               Internet2
                                                          A. Morton, Ed.
                                                               AT&T Labs
                                                        October 21, 2012

                    A One-Way Delay Metric for IPPM
                     draft-morton-ippm-2679-bis-01

Abstract

   This memo (RFC 2679 bis) defines a metric for one-way delay of
   packets across Internet paths.  It builds on notions introduced and
   discussed in the IPPM Framework document, RFC 2330; the reader is
   assumed to be familiar with that document.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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
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   Drafts is at http://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 April 24, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Almes, et al.            Expires April 24, 2013                 [Page 1]
Internet-Draft       A One-Way Delay Metric for IPPM        October 2012

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
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Almes, et al.            Expires April 24, 2013                 [Page 2]
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Table of Contents

   1.  RFC 2679 bis . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  Motivation . . . . . . . . . . . . . . . . . . . . . . . .  5
     2.2.  General Issues Regarding Time  . . . . . . . . . . . . . .  6
   3.  A Singleton Definition for One-way Delay . . . . . . . . . . .  7
     3.1.  Metric Name: . . . . . . . . . . . . . . . . . . . . . . .  7
     3.2.  Metric Parameters: . . . . . . . . . . . . . . . . . . . .  7
     3.3.  Metric Units:  . . . . . . . . . . . . . . . . . . . . . .  8
     3.4.  Definition:  . . . . . . . . . . . . . . . . . . . . . . .  8
     3.5.  Discussion:  . . . . . . . . . . . . . . . . . . . . . . .  8
     3.6.  Methodologies: . . . . . . . . . . . . . . . . . . . . . .  9
     3.7.  Errors and Uncertainties:  . . . . . . . . . . . . . . . . 10
       3.7.1.  Errors or uncertainties related to Clocks  . . . . . . 10
       3.7.2.  Errors or uncertainties related to Wire-time vs
               Host-time  . . . . . . . . . . . . . . . . . . . . . . 12
       3.7.3.  Calibration  . . . . . . . . . . . . . . . . . . . . . 12
     3.8.  Reporting the metric:  . . . . . . . . . . . . . . . . . . 14
       3.8.1.  Type-P . . . . . . . . . . . . . . . . . . . . . . . . 14
       3.8.2.  Loss Threshold . . . . . . . . . . . . . . . . . . . . 15
       3.8.3.  Calibration Results  . . . . . . . . . . . . . . . . . 15
       3.8.4.  Path . . . . . . . . . . . . . . . . . . . . . . . . . 15
   4.  A Definition for Samples of One-way Delay  . . . . . . . . . . 15
     4.1.  Metric Name: . . . . . . . . . . . . . . . . . . . . . . . 16
     4.2.  Metric Parameters: . . . . . . . . . . . . . . . . . . . . 16
     4.3.  Metric Units:  . . . . . . . . . . . . . . . . . . . . . . 16
     4.4.  Definition:  . . . . . . . . . . . . . . . . . . . . . . . 16
     4.5.  Discussion:  . . . . . . . . . . . . . . . . . . . . . . . 17