Network Working Group G. Almes
Internet-Draft S. Kalidindi
Intended status: Informational M. Zekauskas
Expires: April 18, 2013
A. Morton, Ed.
AT&T Labs
October 15, 2012
A One-Way Delay Metric for IPPM
draft-morton-ippm-2679-bis-00
Abstract
This memo 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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This Internet-Draft will expire on April 18, 2013.
Copyright Notice
Copyright (c) 2012 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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Motivation . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2. General Issues Regarding Time . . . . . . . . . . . . . . . 4
2. A Singleton Definition for One-way Delay . . . . . . . . . . . 4
2.1. Metric Name: . . . . . . . . . . . . . . . . . . . . . . . 4
2.2. Metric Parameters: . . . . . . . . . . . . . . . . . . . . 4
2.3. Metric Units: . . . . . . . . . . . . . . . . . . . . . . . 5
2.4. Definition: . . . . . . . . . . . . . . . . . . . . . . . . 5
2.5. Discussion: . . . . . . . . . . . . . . . . . . . . . . . . 5
2.6. Methodologies: . . . . . . . . . . . . . . . . . . . . . . 5
2.7. Errors and Uncertainties: . . . . . . . . . . . . . . . . . 5
2.7.1. Errors or uncertainties related to Clocks . . . . . . . 5
2.7.2. Errors or uncertainties related to Wire-time vs
Host-time . . . . . . . . . . . . . . . . . . . . . . . 5
2.7.3. Calibration . . . . . . . . . . . . . . . . . . . . . . 5
2.8. Reporting the metric: . . . . . . . . . . . . . . . . . . . 5
2.8.1. Type-P . . . . . . . . . . . . . . . . . . . . . . . . 5
2.8.2. Loss Threshold . . . . . . . . . . . . . . . . . . . . 5
2.8.3. Calibration Results . . . . . . . . . . . . . . . . . . 5
2.8.4. Path . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. A Definition for Samples of One-way Delay . . . . . . . . . . . 5
3.1. Metric Name: . . . . . . . . . . . . . . . . . . . . . . . 5
3.2. Metric Parameters: . . . . . . . . . . . . . . . . . . . . 5
3.3. Metric Units: . . . . . . . . . . . . . . . . . . . . . . . 5
3.4. Definition: . . . . . . . . . . . . . . . . . . . . . . . . 5
3.5. Discussion: . . . . . . . . . . . . . . . . . . . . . . . . 5
3.6. Methodologies: . . . . . . . . . . . . . . . . . . . . . . 5
3.7. Errors and Uncertainties: . . . . . . . . . . . . . . . . . 5
3.8. Reporting the metric: . . . . . . . . . . . . . . . . . . . 5
4. Some Statistics Definitions for One-way Delay . . . . . . . . . 6
4.1. Type-P-One-way-Delay-Percentile . . . . . . . . . . . . . . 6
4.2. Type-P-One-way-Delay-Median . . . . . . . . . . . . . . . . 6
4.3. Type-P-One-way-Delay-Minimum . . . . . . . . . . . . . . . 6
4.4. Type-P-One-way-Delay-Inverse-Percentile . . . . . . . . . . 6
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6
8. Refetrences (temporary) . . . . . . . . . . . . . . . . . . . . 6
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7
9.1. Normative References . . . . . . . . . . . . . . . . . . . 7
9.2. Informative References . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 8
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1. Introduction
This memo 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 [1]; the reader is assumed to be
familiar with that document.
This memo is intended to be parallel in structure to a companion
document for Packet Loss ("A One-way Packet Loss Metric for IPPM")
[2].
Although RFC 2119 was written with protocols in mind, the key words
are used in this document for similar reasons. They are used to
ensure the results of measurements from two different implementations
are comparable, and to note instances when an implementation could
perturb the network.
The structure of the memo is as follows:
+ A 'singleton' analytic metric, called Type-P-One-way-Delay, will be
introduced to measure a single observation of one-way delay.
+ Using this singleton metric, a 'sample', called Type-P-One-way-
Delay-Poisson-Stream, will be introduced to measure a sequence of
singleton delays measured at times taken from a Poisson process.
+ Using this sample, several 'statistics' of the sample will be
defined and discussed. This progression from singleton to sample to
statistics, with clear separation among them, is important.
Whenever a technical term from the IPPM Framework document is first
used in this memo, it will be tagged with a trailing asterisk. For
example, "term*" indicates that "term" is defined in the Framework.
1.1. Motivation
1.2. General Issues Regarding Time
2. A Singleton Definition for One-way Delay
2.1. Metric Name:
2.2. Metric Parameters:
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2.3. Metric Units:
2.4. Definition:
2.5. Discussion:
2.6. Methodologies:
2.7. Errors and Uncertainties:
2.7.1. Errors or uncertainties related to Clocks
2.7.2. Errors or uncertainties related to Wire-time vs Host-time
2.7.3. Calibration
2.8. Reporting the metric:
2.8.1. Type-P
2.8.2. Loss Threshold
2.8.3. Calibration Results
2.8.4. Path
3. A Definition for Samples of One-way Delay
3.1. Metric Name:
3.2. Metric Parameters:
3.3. Metric Units:
3.4. Definition:
3.5. Discussion:
3.6. Methodologies:
3.7. Errors and Uncertainties:
3.8. Reporting the metric:
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4. Some Statistics Definitions for One-way Delay
4.1. Type-P-One-way-Delay-Percentile
4.2. Type-P-One-way-Delay-Median
4.3. Type-P-One-way-Delay-Minimum
4.4. Type-P-One-way-Delay-Inverse-Percentile
5. Security Considerations
The
6. IANA Considerations
This memo makes no requests of IANA.
7. Acknowledgements
The authors thank
8. Refetrences (temporary)
[1] Paxson, V., Almes, G., Mahdavi, J. and M. Mathis, "Framework for
IP Performance Metrics", RFC 2330, May 1998.
[2] Almes, G., Kalidindi, S. and M. Zekauskas, "A One-way Packet Loss
Metric for IPPM", RFC 2680, September 1999.
[3] Mills, D., "Network Time Protocol (v3)", RFC 1305, April 1992.
[4] Mahdavi J. and V. Paxson, "IPPM Metrics for Measuring
Connectivity", RFC 2678, September 1999.
[5] Postel, J., "Internet Protocol", STD 5, RFC 791, September 1981.
[6] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[7] Bradner, S., "The Internet Standards Process -- Revision 3", BCP
9, RFC 2026, October 1996.
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9. References
9.1. Normative References
[RFC2026] Bradner, S., "The Internet Standards Process -- Revision
3", BCP 9, RFC 2026, October 1996.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2330] Paxson, V., Almes, G., Mahdavi, J., and M. Mathis,
"Framework for IP Performance Metrics", RFC 2330,
May 1998.
[RFC2679] Almes, G., Kalidindi, S., and M. Zekauskas, "A One-way
Delay Metric for IPPM", RFC 2679, September 1999.
[RFC2680] Almes, G., Kalidindi, S., and M. Zekauskas, "A One-way
Packet Loss Metric for IPPM", RFC 2680, September 1999.
[RFC3432] Raisanen, V., Grotefeld, G., and A. Morton, "Network
performance measurement with periodic streams", RFC 3432,
November 2002.
[RFC4656] Shalunov, S., Teitelbaum, B., Karp, A., Boote, J., and M.
Zekauskas, "A One-way Active Measurement Protocol
(OWAMP)", RFC 4656, September 2006.
[RFC5357] Hedayat, K., Krzanowski, R., Morton, A., Yum, K., and J.
Babiarz, "A Two-Way Active Measurement Protocol (TWAMP)",
RFC 5357, October 2008.
[RFC5657] Dusseault, L. and R. Sparks, "Guidance on Interoperation
and Implementation Reports for Advancement to Draft
Standard", BCP 9, RFC 5657, September 2009.
[RFC5835] Morton, A. and S. Van den Berghe, "Framework for Metric
Composition", RFC 5835, April 2010.
[RFC6049] Morton, A. and E. Stephan, "Spatial Composition of
Metrics", RFC 6049, January 2011.
[RFC6576] Geib, R., Morton, A., Fardid, R., and A. Steinmitz, "IP
Performance Metrics (IPPM) Standard Advancement Testing",
BCP 176, RFC 6576, March 2012.
[RFC6703] Morton, A., Ramachandran, G., and G. Maguluri, "Reporting
IP Network Performance Metrics: Different Points of View",
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RFC 6703, August 2012.
9.2. Informative References
[ADK] Scholz, F. and M. Stephens, "K-sample Anderson-Darling
Tests of fit, for continuous and discrete cases",
University of Washington, Technical Report No. 81,
May 1986.
[RFC3931] Lau, J., Townsley, M., and I. Goyret, "Layer Two Tunneling
Protocol - Version 3 (L2TPv3)", RFC 3931, March 2005.
Authors' Addresses
Guy Almes
Phone:
Fax:
Email:
URI:
S. Kalidindi
Phone:
Fax:
Email:
URI:
Matt Zekauskas
Phone:
Fax:
Email:
URI:
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Al Morton
AT&T Labs
200 Laurel Avenue South
Middletown, NJ 07748
USA
Phone: +1 732 420 1571
Fax: +1 732 368 1192
Email: acmorton@att.com
URI: http://home.comcast.net/~acmacm/
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