draft-ietf-ippm-active-passive-05.txt		draft-ietf-ippm-active-passive-06.txt
	Network Working Group A. Morton		Network Working Group A. Morton
	Internet-Draft AT&T Labs		Internet-Draft AT&T Labs
	Intended status: Informational December 24, 2015		Intended status: Informational January 21, 2016
	Expires: June 26, 2016		Expires: July 24, 2016
	Active and Passive Metrics and Methods (and everything in-between, or		Active and Passive Metrics and Methods (and everything in-between, or
	Hybrid)		Hybrid)
	draft-ietf-ippm-active-passive-05		draft-ietf-ippm-active-passive-06
	Abstract		Abstract
	This memo provides clear definitions for Active and Passive		This memo provides clear definitions for Active and Passive
	performance assessment. The construction of Metrics and Methods can		performance assessment. The construction of Metrics and Methods can
	be described as Active or Passive. Some methods may use a subset of		be described as Active or Passive. Some methods may use a subset of
	both active and passive attributes, and we refer to these as Hybrid		both active and passive attributes, and we refer to these as Hybrid
	Methods. This memo also describes multiple dimensions to help		Methods. This memo also describes multiple dimensions to help
	evaluate new methods as they emerge.		evaluate new methods as they emerge.
	skipping to change at page 1, line 36		skipping to change at page 1, line 36
	Internet-Drafts are working documents of the Internet Engineering		Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF). Note that other groups may also distribute		Task Force (IETF). Note that other groups may also distribute
	working documents as Internet-Drafts. The list of current Internet-		working documents as Internet-Drafts. The list of current Internet-
	Drafts is at http://datatracker.ietf.org/drafts/current/.		Drafts is at http://datatracker.ietf.org/drafts/current/.
	Internet-Drafts are draft documents valid for a maximum of six months		Internet-Drafts are draft documents valid for a maximum of six months
	and may be updated, replaced, or obsoleted by other documents at any		and may be updated, replaced, or obsoleted by other documents at any
	time. It is inappropriate to use Internet-Drafts as reference		time. It is inappropriate to use Internet-Drafts as reference
	material or to cite them other than as "work in progress."		material or to cite them other than as "work in progress."
	This Internet-Draft will expire on June 26, 2016.		This Internet-Draft will expire on July 24, 2016.
	Copyright Notice		Copyright Notice
	Copyright (c) 2015 IETF Trust and the persons identified as the		Copyright (c) 2016 IETF Trust and the persons identified as the
	document authors. All rights reserved.		document authors. All rights reserved.
	This document is subject to BCP 78 and the IETF Trust's Legal		This document is subject to BCP 78 and the IETF Trust's Legal
	Provisions Relating to IETF Documents		Provisions Relating to IETF Documents
	(http://trustee.ietf.org/license-info) in effect on the date of		(http://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents
	carefully, as they describe your rights and restrictions with respect		carefully, as they describe your rights and restrictions with respect
	to this document. Code Components extracted from this document must		to this document. Code Components extracted from this document must
	include Simplified BSD License text as described in Section 4.e of		include Simplified BSD License text as described in Section 4.e of
	the Trust Legal Provisions and are provided without warranty as		the Trust Legal Provisions and are provided without warranty as
	described in the Simplified BSD License.		described in the Simplified BSD License.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
	1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3		1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
	2. Purpose and Scope . . . . . . . . . . . . . . . . . . . . . . 3		2. Purpose and Scope . . . . . . . . . . . . . . . . . . . . . . 3
	3. Terms and Definitions . . . . . . . . . . . . . . . . . . . . 3		3. Terms and Definitions . . . . . . . . . . . . . . . . . . . . 3
	3.1. Performance Metric . . . . . . . . . . . . . . . . . . . 3		3.1. Performance Metric . . . . . . . . . . . . . . . . . . . 4
	3.2. Method of Measurement . . . . . . . . . . . . . . . . . . 4		3.2. Method of Measurement . . . . . . . . . . . . . . . . . . 4
	3.3. Observation Point . . . . . . . . . . . . . . . . . . . . 4		3.3. Observation Point . . . . . . . . . . . . . . . . . . . . 4
	3.4. Active Methods . . . . . . . . . . . . . . . . . . . . . 4		3.4. Active Methods . . . . . . . . . . . . . . . . . . . . . 4
	3.5. Active Metric . . . . . . . . . . . . . . . . . . . . . . 5		3.5. Active Metric . . . . . . . . . . . . . . . . . . . . . . 5
	3.6. Passive Methods . . . . . . . . . . . . . . . . . . . . . 5		3.6. Passive Methods . . . . . . . . . . . . . . . . . . . . . 5
	3.7. Passive Metric . . . . . . . . . . . . . . . . . . . . . 6		3.7. Passive Metric . . . . . . . . . . . . . . . . . . . . . 6
	3.8. Hybrid Methods and Metrics . . . . . . . . . . . . . . . 6		3.8. Hybrid Methods and Metrics . . . . . . . . . . . . . . . 6
	4. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . 8		4. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . 8
	4.1. Graphical Representation . . . . . . . . . . . . . . . . 8		4.1. Graphical Representation . . . . . . . . . . . . . . . . 8
	4.2. Discussion of PDM . . . . . . . . . . . . . . . . . . . . 10		4.2. Discussion of PDM . . . . . . . . . . . . . . . . . . . . 10
	4.3. Discussion of "Coloring" Method . . . . . . . . . . . . . 11		4.3. Discussion of "Coloring" Method . . . . . . . . . . . . . 11
	4.4. Brief Discussion of OAM Methods . . . . . . . . . . . . . 11		4.4. Brief Discussion of OAM Methods . . . . . . . . . . . . . 11
	5. Security considerations . . . . . . . . . . . . . . . . . . . 12		5. Security considerations . . . . . . . . . . . . . . . . . . . 12
	6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12		6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
	7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12		7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12
	8. References . . . . . . . . . . . . . . . . . . . . . . . . . 12		8. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
	8.1. Normative References . . . . . . . . . . . . . . . . . . 12		8.1. Normative References . . . . . . . . . . . . . . . . . . 13
	8.2. Informative References . . . . . . . . . . . . . . . . . 13		8.2. Informative References . . . . . . . . . . . . . . . . . 14
	Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 14		Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 15
	1. Introduction		1. Introduction
	The adjectives "active" and "passive" have been used for many years		The adjectives "active" and "passive" have been used for many years
	to distinguish two different classes of Internet performance		to distinguish two different classes of Internet performance
	assessment. The first Passive and Active Measurement (PAM)		assessment. The first Passive and Active Measurement (PAM)
	Conference was held in 2000, but the earliest proceedings available		Conference was held in 2000, but the earliest proceedings available
	on-line are from the second PAM conference in 2001		on-line are from the second PAM conference in 2001
	[https://www.ripe.net/ripe/meetings/pam-2001].		[https://www.ripe.net/ripe/meetings/pam-2001].
	skipping to change at page 3, line 44		skipping to change at page 3, line 44
	Hybrid methods.		Hybrid methods.
	Further, this memo's purpose includes describing multiple dimensions		Further, this memo's purpose includes describing multiple dimensions
	to evaluate new methods as they emerge.		to evaluate new methods as they emerge.
	3. Terms and Definitions		3. Terms and Definitions
	This section defines the key terms of the memo. Some definitions use		This section defines the key terms of the memo. Some definitions use
	the notion of "stream of interest" which is synonymous with		the notion of "stream of interest" which is synonymous with
	"population of interest" defined in clause 6.1.1 of ITU-T		"population of interest" defined in clause 6.1.1 of ITU-T
	Recommendation Y.1540 [Y.1540]. The definitions are consistent with		Recommendation Y.1540 [Y.1540]. These definitions will be useful for
	[I-D.zheng-ippm-framework-passive].		work-in-progress, such as [I-D.zheng-ippm-framework-passive] (with
			which there is already good consistency).
	3.1. Performance Metric		3.1. Performance Metric
	The standard definition of a quantity, produced in an assessment of		The standard definition of a quantity, produced in an assessment of
	performance and/or reliability of the network, which has an intended		performance and/or reliability of the network, which has an intended
	utility and is carefully specified to convey the exact meaning of a		utility and is carefully specified to convey the exact meaning of a
	measured value. (This definition is consistent with that of		measured value. (This definition is consistent with that of
	Performance Metric in [RFC2330] and [RFC6390]).		Performance Metric in [RFC2330] and [RFC6390]).
	3.2. Method of Measurement		3.2. Method of Measurement
	skipping to change at page 9, line 29		skipping to change at page 9, line 33
	|* Active using extremely sparse, randomized stream		|* Active using extremely sparse, randomized stream
	| * PDM Passive		| * PDM Passive
	| Min *		| Min *
	+----------------------------------------------------------------|		+----------------------------------------------------------------|
	| |		| |
	Stream X-Axis: a priori Stream Knowledge No Stream		Stream X-Axis: a priori Stream Knowledge No Stream
	Characteristics Characteristics		Characteristics Characteristics
	completely Known		completely Known
	known		known
			(In the graph above, "PDM" refers to [I-D.ietf-ippm-6man-pdm-option],
			an IPv6 Option Header for Performance and Diagnostic Measurements,
			descrived in section 4.2.)
	We recognize that method categorization could be based on additional		We recognize that method categorization could be based on additional
	dimensions, but this would require a different graphical approach.		dimensions, but this would require a different graphical approach.
	For example, "effect of stream of interest on network conditions"		For example, "effect of stream of interest on network conditions"
	could easily be further qualified into:		could easily be further qualified into:
	1. effect on the performance of the stream of interest itself: for		1. effect on the performance of the stream of interest itself: for
	example, choosing a packet marking or Differentiated Services		example, choosing a packet marking or Differentiated Services
	Code Point (DSCP) resulting in domain treatment as a real-time		Code Point (DSCP) resulting in domain treatment as a real-time
	stream (as opposed to default/best-effort marking).		stream (as opposed to default/best-effort marking).
	skipping to change at page 11, line 13		skipping to change at page 11, line 22
	effect will not be realized.		effect will not be realized.
	We conclude that this is a Hybrid Type I method, having at least one		We conclude that this is a Hybrid Type I method, having at least one
	characteristic of both active and passive methods for a single stream		characteristic of both active and passive methods for a single stream
	of interest.		of interest.
	4.3. Discussion of "Coloring" Method		4.3. Discussion of "Coloring" Method
	Draft [I-D.tempia-opsawg-p3m], proposed to color packets by re-		Draft [I-D.tempia-opsawg-p3m], proposed to color packets by re-
	writing a field of the stream at strategic interfaces to support		writing a field of the stream at strategic interfaces to support
	performance measurements. This method processes a user traffic		performance measurements (noting that this is a difficult operation
	stream and inserts "fields or values which are dedicated to		at an intermediate point on an encrypted Virtual Private Network).
	measurement". Thus:		This method processes a user traffic stream and inserts "fields or
			values which are dedicated to measurement". Thus:
	o The method intends to have a small effect on the measured stream		o The method intends to have a small effect on the measured stream
	and other streams in the network (smaller than PDM above). There		and other streams in the network (smaller than PDM above). There
	are conditions where this intent may not be realized.		are conditions where this intent may not be realized.
	o The measured stream has unknown characteristics until it is		o The measured stream has unknown characteristics until it is
	processed to add the coloring in the header, and the stream could		processed to add the coloring in the header, and the stream could
	be measured and time-stamped during that process.		be measured and time-stamped during that process.
	We note that [I-D.chen-ippm-coloring-based-ipfpm-framework] proposes		We note that [I-D.chen-ippm-coloring-based-ipfpm-framework] proposes
End of changes. 9 change blocks.
	15 lines changed or deleted		21 lines changed or added
This html diff was produced by rfcdiff 1.42. The latest version is available from http://tools.ietf.org/tools/rfcdiff/