draft-ietf-ippm-spatial-composition-05.txt   draft-ietf-ippm-spatial-composition-06.txt 
Network Working Group A. Morton Network Working Group A. Morton
Internet-Draft AT&T Labs Internet-Draft AT&T Labs
Intended status: Standards Track E. Stephan Intended status: Standards Track E. Stephan
Expires: May 8, 2008 France Telecom Division R&D Expires: August 27, 2008 France Telecom Division R&D
November 5, 2007 February 24, 2008
Spatial Composition of Metrics Spatial Composition of Metrics
draft-ietf-ippm-spatial-composition-05 draft-ietf-ippm-spatial-composition-06
Status of this Memo Status of this Memo
By submitting this Internet-Draft, each author represents that any By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79. aware will be disclosed, in accordance with Section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
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material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
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This Internet-Draft will expire on May 8, 2008. This Internet-Draft will expire on August 27, 2008.
Copyright Notice Copyright Notice
Copyright (C) The IETF Trust (2007). Copyright (C) The IETF Trust (2008).
Abstract Abstract
This memo utilizes IPPM metrics that are applicable to both complete This memo utilizes IPPM metrics that are applicable to both complete
paths and sub-paths, and defines relationships to compose a complete paths and sub-paths, and defines relationships to compose a complete
path metric from the sub-path metrics with some accuracy w.r.t. the path metric from the sub-path metrics with some accuracy w.r.t. the
actual metrics. This is called Spatial Composition in RFC 2330. The actual metrics. This is called Spatial Composition in RFC 2330. The
memo refers to the Framework for Metric Composition, and provides memo refers to the Framework for Metric Composition, and provides
background and motivation for combining metrics to derive others. background and motivation for combining metrics to derive others.
The descriptions of several composed metrics and statistics follow. The descriptions of several composed metrics and statistics follow.
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\ \
CompMeanDelay = > (MeanDelay [i]) CompMeanDelay = > (MeanDelay [i])
/ /
--- ---
i = 1 i = 1
5.2.5. Statement of Conjecture and Assumptions 5.2.5. Statement of Conjecture and Assumptions
The mean of a sufficiently large stream of packets measured on each The mean of a sufficiently large stream of packets measured on each
sub-path during the interval [T, Tf] will be representative of the sub-path during the interval [T, Tf] will be representative of the
true mean of the delay distribution (and the distributions themselves ground truth mean of the delay distribution (and the distributions
are sufficiently independent), such that the means may be added to themselves are sufficiently independent), such that the means may be
produce an estimate of the complete path mean delay. added to produce an estimate of the complete path mean delay.
It is assumed that the one-way delay distributions of the sub-paths It is assumed that the one-way delay distributions of the sub-paths
and the complete path are continuous. and the complete path are continuous.
5.2.6. Justification of the Composition Function 5.2.6. Justification of the Composition Function
See the common section. See the common section.
5.2.7. Sources of Deviation from the Ground Truth 5.2.7. Sources of Deviation from the Ground Truth
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\ \
CompMinDelay = > (MinDelay [i]) CompMinDelay = > (MinDelay [i])
/ /
--- ---
i = 1 i = 1
5.3.5. Statement of Conjecture and Assumptions 5.3.5. Statement of Conjecture and Assumptions
The minimum of a sufficiently large stream of packets measured on The minimum of a sufficiently large stream of packets measured on
each sub-path during the interval [T, Tf] will be representative of each sub-path during the interval [T, Tf] will be representative of
the true minimum of the delay distribution (and the distributions the ground truth minimum of the delay distribution (and the
themselves are sufficiently independent), such that the minima may be distributions themselves are sufficiently independent), such that the
added to produce an estimate of the complete path minimum delay. minima may be added to produce an estimate of the complete path
minimum delay.
It is assumed that the one-way delay distributions of the sub-paths It is assumed that the one-way delay distributions of the sub-paths
and the complete path are continuous. and the complete path are continuous.
5.3.6. Justification of the Composition Function 5.3.6. Justification of the Composition Function
See the common section. See the common section.
5.3.7. Sources of Deviation from the Ground Truth 5.3.7. Sources of Deviation from the Ground Truth
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If any Epn is undefined in a particular measurement interval, If any Epn is undefined in a particular measurement interval,
possibly because a measurement system failed to report a value, then possibly because a measurement system failed to report a value, then
any CompEp that uses sub-path n for that measurement interval is any CompEp that uses sub-path n for that measurement interval is
undefined. undefined.
6.1.6. Statement of Conjecture and Assumptions 6.1.6. Statement of Conjecture and Assumptions
The empirical probability of loss calculated on a sufficiently large The empirical probability of loss calculated on a sufficiently large
stream of packets measured on each sub-path during the interval [T, stream of packets measured on each sub-path during the interval [T,
Tf] will be representative of the true empirical loss probability Tf] will be representative of the ground truth empirical loss
(and the probabilities themselves are sufficiently independent), such probability (and the probabilities themselves are sufficiently
that the sub-path probabilities may be combined to produce an independent), such that the sub-path probabilities may be combined to
estimate of the complete path empirical loss probability. produce an estimate of the complete path empirical loss probability.
6.1.7. Justification of the Composition Function 6.1.7. Justification of the Composition Function
See the common section. See the common section.
6.1.8. Sources of Deviation from the Ground Truth 6.1.8. Sources of Deviation from the Ground Truth
See the common section. See the common section.
6.1.9. Specific cases where the conjecture might fail 6.1.9. Specific cases where the conjecture might fail
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>>>>>>>>>>>>>>>>RESOLUTION: No and Yes. >>>>>>>>>>>>>>>>RESOLUTION: No and Yes.
11. Acknowledgements 11. Acknowledgements
12. References 12. References
12.1. Normative References 12.1. Normative References
[I-D.ietf-ippm-framework-compagg] [I-D.ietf-ippm-framework-compagg]
Morton, A., "Framework for Metric Composition", Morton, A., "Framework for Metric Composition",
draft-ietf-ippm-framework-compagg-04 (work in progress), draft-ietf-ippm-framework-compagg-06 (work in progress),
July 2007. February 2008.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997. Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2330] Paxson, V., Almes, G., Mahdavi, J., and M. Mathis, [RFC2330] Paxson, V., Almes, G., Mahdavi, J., and M. Mathis,
"Framework for IP Performance Metrics", RFC 2330, "Framework for IP Performance Metrics", RFC 2330,
May 1998. May 1998.
[RFC2679] Almes, G., Kalidindi, S., and M. Zekauskas, "A One-way [RFC2679] Almes, G., Kalidindi, S., and M. Zekauskas, "A One-way
Delay Metric for IPPM", RFC 2679, September 1999. Delay Metric for IPPM", RFC 2679, September 1999.
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[RFC3393] Demichelis, C. and P. Chimento, "IP Packet Delay Variation [RFC3393] Demichelis, C. and P. Chimento, "IP Packet Delay Variation
Metric for IP Performance Metrics (IPPM)", RFC 3393, Metric for IP Performance Metrics (IPPM)", RFC 3393,
November 2002. November 2002.
[RFC4148] Stephan, E., "IP Performance Metrics (IPPM) Metrics [RFC4148] Stephan, E., "IP Performance Metrics (IPPM) Metrics
Registry", BCP 108, RFC 4148, August 2005. Registry", BCP 108, RFC 4148, August 2005.
12.2. Informative References 12.2. Informative References
[I-D.ietf-ippm-multimetrics] [I-D.ietf-ippm-multimetrics]
Stephan, E., "IP Performance Metrics (IPPM) for spatial Stephan, E., Liang, L., and A. Morton, "IP Performance
and multicast", draft-ietf-ippm-multimetrics-04 (work in Metrics (IPPM) for spatial and multicast",
progress), July 2007. draft-ietf-ippm-multimetrics-06 (work in progress),
February 2008.
[Y.1540] ITU-T Recommendation Y.1540, "Internet protocol data [Y.1540] ITU-T Recommendation Y.1540, "Internet protocol data
communication service - IP packet transfer and communication service - IP packet transfer and
availability performance parameters", December 2002. availability performance parameters", December 2002.
[Y.1541] ITU-T Recommendation Y.1541, "Network Performance [Y.1541] ITU-T Recommendation Y.1541, "Network Performance
Objectives for IP-based Services", February 2006. Objectives for IP-based Services", February 2006.
Authors' Addresses Authors' Addresses
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Lannion, F-22307 Lannion, F-22307
France France
Phone: Phone:
Fax: +33 2 96 05 18 52 Fax: +33 2 96 05 18 52
Email: emile.stephan@orange-ftgroup.com Email: emile.stephan@orange-ftgroup.com
URI: URI:
Full Copyright Statement Full Copyright Statement
Copyright (C) The IETF Trust (2007). Copyright (C) The IETF Trust (2008).
This document is subject to the rights, licenses and restrictions This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors contained in BCP 78, and except as set forth therein, the authors
retain all their rights. retain all their rights.
This document and the information contained herein are provided on an This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
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