A One-Way Delay Metric for IPPM
draft-morton-ippm-2679-bis-01
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2012-10-21
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draft-ietf-ippm-2679-bis, rfc7679
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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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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
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Almes, et al. Expires April 24, 2013 [Page 2]
Internet-Draft A One-Way Delay Metric for IPPM October 2012
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
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