draft-ietf-ccamp-rwa-info-08.txt		draft-ietf-ccamp-rwa-info-09.txt
	Network Working Group Y. Lee		Network Working Group Y. Lee
	Internet Draft Huawei		Internet Draft Huawei
	Intended status: Informational G. Bernstein		Intended status: Informational G. Bernstein
	Expires: January 2011 Grotto Networking		Expires: March 2011 Grotto Networking
	D. Li		D. Li
	Huawei		Huawei
	W. Imajuku		W. Imajuku
	NTT		NTT
	July 12, 2010		September 3, 2010
	Routing and Wavelength Assignment Information Model for Wavelength		Routing and Wavelength Assignment Information Model for Wavelength
	Switched Optical Networks		Switched Optical Networks
	draft-ietf-ccamp-rwa-info-08.txt		draft-ietf-ccamp-rwa-info-09.txt
	Status of this Memo		Status of this Memo
	This Internet-Draft is submitted to IETF in full conformance with the		This Internet-Draft is submitted to IETF in full conformance with the
	provisions of BCP 78 and BCP 79.		provisions of BCP 78 and BCP 79.
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	skipping to change at page 1, line 39		skipping to change at page 1, line 39
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	This Internet-Draft will expire on January 12, 2011.		This Internet-Draft will expire on March 3, 2011.
	Copyright Notice		Copyright Notice
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	document authors. All rights reserved.		document authors. All rights reserved.
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	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
	skipping to change at page 2, line 34		skipping to change at page 2, line 34
	information that may be of use to other technologies utilizing a		information that may be of use to other technologies utilizing a
	GMPLS control plane are discussed.		GMPLS control plane are discussed.
	Table of Contents		Table of Contents
	1. Introduction...................................................3		1. Introduction...................................................3
	1.1. Revision History..........................................4		1.1. Revision History..........................................4
	1.1.1. Changes from 01......................................4		1.1.1. Changes from 01......................................4
	1.1.2. Changes from 02......................................4		1.1.2. Changes from 02......................................4
	1.1.3. Changes from 03......................................4		1.1.3. Changes from 03......................................4
	1.1.4. Changes from 04......................................4		1.1.4. Changes from 04......................................5
	1.1.5. Changes from 05......................................5		1.1.5. Changes from 05......................................5
	1.1.6. Changes from 06......................................5		1.1.6. Changes from 06......................................5
	1.1.7. Changes from 07......................................5		1.1.7. Changes from 07......................................5
			1.1.8. Changes from 08......................................5
	2. Terminology....................................................5		2. Terminology....................................................5
	3. Routing and Wavelength Assignment Information Model............6		3. Routing and Wavelength Assignment Information Model............6
	3.1. Dynamic and Relatively Static Information.................6		3.1. Dynamic and Relatively Static Information.................6
	4. Node Information (General).....................................7		4. Node Information (General).....................................7
	4.1. Connectivity Matrix.......................................7		4.1. Connectivity Matrix.......................................7
	4.2. Shared Risk Node Group....................................8		4.2. Shared Risk Node Group....................................8
	5. Node Information (WSON specific)...............................8		5. Node Information (WSON specific)...............................8
	5.1. Resource Accessibility/Availability.......................9		5.1. Resource Accessibility/Availability.......................9
	5.2. Resource Signal Constraints and Processing Capabilities..13		5.2. Resource Signal Constraints and Processing Capabilities..13
	5.3. Compatibility and Capability Details.....................14		5.3. Compatibility and Capability Details.....................14
	skipping to change at page 3, line 17		skipping to change at page 3, line 18
	5.3.4. Bit Rate Range List.................................14		5.3.4. Bit Rate Range List.................................14
	5.3.5. Acceptable Client Signal List.......................15		5.3.5. Acceptable Client Signal List.......................15
	5.3.6. Processing Capability List..........................15		5.3.6. Processing Capability List..........................15
	6. Link Information (General)....................................15		6. Link Information (General)....................................15
	6.1. Administrative Group.....................................16		6.1. Administrative Group.....................................16
	6.2. Interface Switching Capability Descriptor................16		6.2. Interface Switching Capability Descriptor................16
	6.3. Link Protection Type (for this link).....................16		6.3. Link Protection Type (for this link).....................16
	6.4. Shared Risk Link Group Information.......................16		6.4. Shared Risk Link Group Information.......................16
	6.5. Traffic Engineering Metric...............................16		6.5. Traffic Engineering Metric...............................16
	6.6. Port Label (Wavelength) Restrictions.....................16		6.6. Port Label (Wavelength) Restrictions.....................16
	7. Dynamic Components of the Information Model...................18		6.6.1. Port-Wavelength Exclusivity Example.................18
	7.1. Dynamic Link Information (General).......................18		7. Dynamic Components of the Information Model...................19
	7.2. Dynamic Node Information (WSON Specific).................19		7.1. Dynamic Link Information (General).......................20
	8. Security Considerations.......................................19		7.2. Dynamic Node Information (WSON Specific).................20
	9. IANA Considerations...........................................19		8. Security Considerations.......................................20
	10. Acknowledgments..............................................19		9. IANA Considerations...........................................21
	11. References...................................................20		10. Acknowledgments..............................................21
	11.1. Normative References....................................20		11. References...................................................22
	11.2. Informative References..................................21		11.1. Normative References....................................22
	12. Contributors.................................................22		11.2. Informative References..................................23
	Author's Addresses...............................................22		12. Contributors.................................................24
	Intellectual Property Statement..................................23		Author's Addresses...............................................24
	Disclaimer of Validity...........................................24		Intellectual Property Statement..................................25
			Disclaimer of Validity...........................................26
	1. Introduction		1. Introduction
	The purpose of the following information model for WSONs is to		The purpose of the following information model for WSONs is to
	facilitate constrained lightpath computation and as such is not a		facilitate constrained lightpath computation and as such is not a
	general purpose network management information model. This constraint		general purpose network management information model. This constraint
	is frequently referred to as the "wavelength continuity" constraint,		is frequently referred to as the "wavelength continuity" constraint,
	and the corresponding constrained lightpath computation is known as		and the corresponding constrained lightpath computation is known as
	the routing and wavelength assignment (RWA) problem. Hence the		the routing and wavelength assignment (RWA) problem. Hence the
	information model must provide sufficient topology and wavelength		information model must provide sufficient topology and wavelength
	skipping to change at page 5, line 29		skipping to change at page 5, line 33
	Simplified information model for WSON specifics, by combining similar		Simplified information model for WSON specifics, by combining similar
	fields and introducing simpler aggregate information elements.		fields and introducing simpler aggregate information elements.
	1.1.7. Changes from 07		1.1.7. Changes from 07
	Added shared fiber connectivity to resource pool modeling. This		Added shared fiber connectivity to resource pool modeling. This
	includes information for determining wavelength collision on an		includes information for determining wavelength collision on an
	internal fiber providing access to resource blocks.		internal fiber providing access to resource blocks.
			1.1.8. Changes from 08
			Added PORT_WAVELENGTH_EXCLUSIVITY in the RestrictionType parameter.
			Added section 6.6.1 that has an example of the port wavelength
			exclusivity constraint.
	2. Terminology		2. Terminology
	CWDM: Coarse Wavelength Division Multiplexing.		CWDM: Coarse Wavelength Division Multiplexing.
	DWDM: Dense Wavelength Division Multiplexing.		DWDM: Dense Wavelength Division Multiplexing.
	FOADM: Fixed Optical Add/Drop Multiplexer.		FOADM: Fixed Optical Add/Drop Multiplexer.
	ROADM: Reconfigurable Optical Add/Drop Multiplexer. A reduced port		ROADM: Reconfigurable Optical Add/Drop Multiplexer. A reduced port
	count wavelength selective switching element featuring ingress and		count wavelength selective switching element featuring ingress and
	skipping to change at page 9, line 46		skipping to change at page 10, line 6
	was generally discussed in [WSON-Frame] and consisted of a matrix to		was generally discussed in [WSON-Frame] and consisted of a matrix to
	indicate possible connectivity along with wavelength constraints for		indicate possible connectivity along with wavelength constraints for
	links/ports. Since regenerators or wavelength converters may be		links/ports. Since regenerators or wavelength converters may be
	considered a scarce resource we will also want to our model to		considered a scarce resource we will also want to our model to
	include as a minimum the usage state (availability) of individual		include as a minimum the usage state (availability) of individual
	regenerators or converters in the pool. Models that incorporate more		regenerators or converters in the pool. Models that incorporate more
	state to further reveal blocking conditions on ingress or egress to		state to further reveal blocking conditions on ingress or egress to
	particular converters are for further study and not included here.		particular converters are for further study and not included here.
	The three stage model as shown schematically in Figure 1 and Figure		The three stage model as shown schematically in Figure 1 and Figure
	2. In this model we assume N ingress ports (fibers), P resource		2.The difference between the two figures is that in Figure 1 we
	blocks containing one or more identical resources (e.g. wavelength		assume that each signal that can get to a resource block may do so,
			while in Figure 2 the access to the resource blocks is via a shared
			fiber which imposes its own wavelength collision constraint. In the
			representation of Figure 1 we can have more than one ingress to each
			resource block since each ingress represents a single wavelength
			signal, while in Figure 2 we show a single multiplexed WDM ingress,
			e.g., a fiber, to each block.
			In this model we assume N ingress ports (fibers), P resource blocks
			containing one or more identical resources (e.g. wavelength
	converters), and M egress ports (fibers). Since not all ingress ports		converters), and M egress ports (fibers). Since not all ingress ports
	can necessarily reach each resource block, the model starts with a		can necessarily reach each resource block, the model starts with a
	resource pool ingress matrix RI(i,p) = {0,1} whether ingress port i		resource pool ingress matrix RI(i,p) = {0,1} whether ingress port i
	can reach potentially reach resource block p.		can reach potentially reach resource block p.
	Since not all wavelengths can necessarily reach all the resources or		Since not all wavelengths can necessarily reach all the resources or
	the resources may have limited input wavelength range we have a set		the resources may have limited input wavelength range we have a set
	of relatively static ingress port constraints for each resource. In		of relatively static ingress port constraints for each resource. In
	addition, if the access to a resource block is via a shared fiber		addition, if the access to a resource block is via a shared fiber
	this would impose a dynamic wavelength availability constraints on		(Figure 2) this would impose a dynamic wavelength availability
	that shared fiber. We can model each resource block ingress port		constraint on that shared fiber. We can model each resource block
	constraint via a static wavelength set mechanism and in the case of		ingress port constraint via a static wavelength set mechanism and in
	shared access to a block via another dynamic wavelength set		the case of shared access to a block via another dynamic wavelength
	mechanism.		set mechanism.
	Next we have a state vector RA(j) = {0,...,k} which tells us the		Next we have a state vector RA(j) = {0,...,k} which tells us the
	number of resources in resource block j in use. This is the only		number of resources in resource block j in use. This is the only
	state kept in the resource pool model. This state is not necessary		state kept in the resource pool model. This state is not necessary
	for modeling "fixed" transponder system or full OEO switches with WDM		for modeling "fixed" transponder system or full OEO switches with WDM
	interfaces, i.e., systems where there is no sharing.		interfaces, i.e., systems where there is no sharing.
	After that, we have a set of static resource egress wavelength		After that, we have a set of static resource egress wavelength
	constraints and possibly dynamic shared egress fiber constraints. The		constraints and possibly dynamic shared egress fiber constraints. The
	static constraints indicate what wavelengths a particular resource		static constraints indicate what wavelengths a particular resource
	block can generate or are restricted to generating e.g., a fixed		block can generate or are restricted to generating e.g., a fixed
	regenerator would be limited to a single lambda. The dynamic		regenerator would be limited to a single lambda. The dynamic
	constraints would be used in the case where a single shared fiber is		constraints would be used in the case where a single shared fiber is
	used to egress the resource block.		used to egress the resource block (Figure 2).
	Finally, we have a resource pool egress matrix RE(p,k) = {0,1}		Finally, we have a resource pool egress matrix RE(p,k) = {0,1}
	depending on whether the output from resource block p can reach		depending on whether the output from resource block p can reach
	egress port k. Examples of this method being used to model wavelength		egress port k. Examples of this method being used to model wavelength
	converter pools for several switch architectures from the literature		converter pools for several switch architectures from the literature
	are given in reference [WC-Pool].		are given in reference [WC-Pool].
	I1 +-------------+ +-------------+ E1		I1 +-------------+ +-------------+ E1
	----->| | +--------+ | |----->		----->| | +--------+ | |----->
	I2 | +------+ Rb #1 +-------+ | E2		I2 | +------+ Rb #1 +-------+ | E2
	skipping to change at page 17, line 40		skipping to change at page 17, line 40
	The RestrictionType parameter is used to specify general port		The RestrictionType parameter is used to specify general port
	restrictions and matrix specific restrictions. It can take the		restrictions and matrix specific restrictions. It can take the
	following values and meanings:		following values and meanings:
	SIMPLE_WAVELENGTH: Simple wavelength set restriction; The		SIMPLE_WAVELENGTH: Simple wavelength set restriction; The
	wavelength set parameter is required.		wavelength set parameter is required.
	CHANNEL_COUNT: The number of channels is restricted to be less than		CHANNEL_COUNT: The number of channels is restricted to be less than
	or equal to the Max number of channels parameter (which is required).		or equal to the Max number of channels parameter (which is required).
			PORT_WAVELENGTH_EXCLUSIVITY: A wavelength can be used at most once
			among a given set of ports. The set of ports is specified as a
			parameter to this constraint.
	WAVEBAND1: Waveband device with a tunable center frequency and		WAVEBAND1: Waveband device with a tunable center frequency and
	passband. This constraint is characterized by the MaxWaveBandWidth		passband. This constraint is characterized by the MaxWaveBandWidth
	parameters which indicates the maximum width of the waveband in terms		parameters which indicates the maximum width of the waveband in terms
	of channels. Note that an additional wavelength set can be used to		of channels. Note that an additional wavelength set can be used to
	indicate the overall tuning range. Specific center frequency tuning		indicate the overall tuning range. Specific center frequency tuning
	information can be obtained from dynamic channel in use information.		information can be obtained from dynamic channel in use information.
	It is assumed that both center frequency and bandwidth (Q) tuning can		It is assumed that both center frequency and bandwidth (Q) tuning can
	be done without causing faults in existing signals.		be done without causing faults in existing signals.
	Restriction specific parameters are used with one or more of the		Restriction specific parameters are used with one or more of the
	previously listed restriction types. The currently defined parameters		previously listed restriction types. The currently defined parameters
	are:		are:
	LabelSet is a conceptual set of labels (wavelengths).		LabelSet is a conceptual set of labels (wavelengths).
	MaxNumChannels is the maximum number of channels that can be		MaxNumChannels is the maximum number of channels that can be
	skipping to change at page 18, line 17		skipping to change at page 18, line 20
	are:		are:
	LabelSet is a conceptual set of labels (wavelengths).		LabelSet is a conceptual set of labels (wavelengths).
	MaxNumChannels is the maximum number of channels that can be		MaxNumChannels is the maximum number of channels that can be
	simultaneously used (relative to either a port or a matrix).		simultaneously used (relative to either a port or a matrix).
	MaxWaveBandWidth is the maximum width of a tunable waveband		MaxWaveBandWidth is the maximum width of a tunable waveband
	switching device.		switching device.
			PortSet is a conceptual set of ports.
	For example, if the port is a "colored" drop port of a ROADM then we		For example, if the port is a "colored" drop port of a ROADM then we
	have two restrictions: (a) CHANNEL_COUNT, with MaxNumChannels = 1,		have two restrictions: (a) CHANNEL_COUNT, with MaxNumChannels = 1,
	and (b) SIMPLE_WAVELENGTH, with the wavelength set consisting of a		and (b) SIMPLE_WAVELENGTH, with the wavelength set consisting of a
	single member corresponding to the frequency of the permitted		single member corresponding to the frequency of the permitted
	wavelength. See [Switch] for a complete waveband example.		wavelength. See [Switch] for a complete waveband example.
	This information model for port wavelength (label) restrictions is		This information model for port wavelength (label) restrictions is
	fairly general in that it can be applied to ports that have label		fairly general in that it can be applied to ports that have label
	restrictions only or to ports that are part of an asymmetric switch		restrictions only or to ports that are part of an asymmetric switch
	and have label restrictions. In addition, the types of label		and have label restrictions. In addition, the types of label
	restrictions that can be supported are extensible.		restrictions that can be supported are extensible.
			6.6.1. Port-Wavelength Exclusivity Example
			Although there can be many different ROADM or switch architectures
			that can lead to the constraint where a lambda (label) maybe used at
			most once on a set of ports Figure 3 shows a ROADM architecture based
			on components known as a Wavelength Selective Switch (WSS)[OFC08].
			This ROADM is composed of splitters, combiners, and WSSes. This ROADM
			has 11 egress ports, which are numbered in the diagram. Egress ports
			1-8 are known as drop ports and are intended to support a single
			wavelength. Drop ports 1-4 egress from WSS #2, which is fed from WSS
			#1 via a single fiber. Due to this internal structure a constraint is
			placed on the egress ports 1-4 that a lambda can be only used once
			over the group of ports (assuming uni-cast and not multi-cast
			operation). Similarly we see that egress ports 5-8 have a similar
			constraint due to the internal structure.
			| A
			v 10 |
			+-------+ +-------+
			| Split | |WSS 6 |
			+-------+ +-------+
			+----+ | | | | | | | |
			| W | | | | | | | | +-------+ +----+
			| S |--------------+ | | | +-----+ | +----+ | | S |
			9 | S |----------------|---|----|-------|------|----|---| p |
			<--| |----------------|---|----|-------|----+ | +---| l |<--
			| 5 |--------------+ | | | +-----+ | | +--| i |
			+----+ | | | | | +------|-|-----|--| t |
			+--------|-+ +----|-|---|------|----+ | +----+
			+----+ | | | | | | | | |
			| S |-----|--------|----------+ | | | | | | +----+
			| p |-----|--------|------------|---|------|----|--|--| W |
			-->| l |-----|-----+ | +----------+ | | | +--|--| S |11
			| i |---+ | | | | +------------|------|-------|--| S |-->
			| t | | | | | | | | | | +---|--| |
			+----+ | | +---|--|-|-|------------|------|-|-|---+ | 7 |
			| | | +--|-|-|--------+ | | | | | +----+
			| | | | | | | | | | | |
			+------+ +------+ +------+ +------+
			| WSS 1| | Split| | WSS 3| | Split|
			+--+---+ +--+---+ +--+---+ +--+---+
			| A | A
			v | v |
			+-------+ +--+----+ +-------+ +--+----+
			| WSS 2 | | Comb. | | WSS 4 | | Comb. |
			+-------+ +-------+ +-------+ +-------+
			1|2|3|4| A A A A 5|6|7|8| A A A A
			v v v v | | | | v v v v | | | |
			Figure 3 A ROADM composed from splitter, combiners, and WSSs.
	7. Dynamic Components of the Information Model		7. Dynamic Components of the Information Model
	In the previously presented information model there are a limited		In the previously presented information model there are a limited
	number of information elements that are dynamic, i.e., subject to		number of information elements that are dynamic, i.e., subject to
	change with subsequent establishment and teardown of connections.		change with subsequent establishment and teardown of connections.
	Depending on the protocol used to convey this overall information		Depending on the protocol used to convey this overall information
	model it may be possible to send this dynamic information separate		model it may be possible to send this dynamic information separate
	from the relatively larger amount of static information needed to		from the relatively larger amount of static information needed to
	characterize WSON's and their network elements.		characterize WSON's and their network elements.
	skipping to change at page 21, line 15		skipping to change at page 23, line 15
	[RFC5307] Kompella, K., Ed., and Y. Rekhter, Ed., "IS-IS Extensions		[RFC5307] Kompella, K., Ed., and Y. Rekhter, Ed., "IS-IS Extensions
	in Support of Generalized Multi-Protocol Label Switching		in Support of Generalized Multi-Protocol Label Switching
	(GMPLS)", RFC 5307, October 2008.		(GMPLS)", RFC 5307, October 2008.
	[WSON-Frame] Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS		[WSON-Frame] Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS
	and PCE Control of Wavelength Switched Optical Networks",		and PCE Control of Wavelength Switched Optical Networks",
	work in progress: draft-ietf-ccamp-rwa-wson-framework.		work in progress: draft-ietf-ccamp-rwa-wson-framework.
	11.2. Informative References		11.2. Informative References
			[OFC08] P. Roorda and B. Collings, "Evolution to Colorless and
			Directionless ROADM Architectures," Optical Fiber
			communication/National Fiber Optic Engineers Conference, 2008.
			OFC/NFOEC 2008. Conference on, 2008, pp. 1-3.
	[Shared] G. Bernstein, Y. Lee, "Shared Backup Mesh Protection in PCE-		[Shared] G. Bernstein, Y. Lee, "Shared Backup Mesh Protection in PCE-
	based WSON Networks", iPOP 2008, http://www.grotto-		based WSON Networks", iPOP 2008, http://www.grotto-
	networking.com/wson/iPOP2008_WSON-shared-mesh-poster.pdf .		networking.com/wson/iPOP2008_WSON-shared-mesh-poster.pdf .
	[Switch] G. Bernstein, Y. Lee, A. Gavler, J. Martensson, " Modeling		[Switch] G. Bernstein, Y. Lee, A. Gavler, J. Martensson, " Modeling
	WDM Wavelength Switching Systems for Use in GMPLS and Automated		WDM Wavelength Switching Systems for Use in GMPLS and Automated
	Path Computation", Journal of Optical Communications and		Path Computation", Journal of Optical Communications and
	Networking, vol. 1, June, 2009, pp. 187-195.		Networking, vol. 1, June, 2009, pp. 187-195.
	[G.Sup39] ITU-T Series G Supplement 39, Optical system design and		[G.Sup39] ITU-T Series G Supplement 39, Optical system design and
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