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Versions: (draft-bernstein-ccamp-wson-encode) 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 RFC 7581

Network Working Group                                      G. Bernstein
Internet Draft                                        Grotto Networking
Intended status: Standards Track                                 Y. Lee
Expires: May 2013                                                 D. Li
                                                                 Huawei
                                                             W. Imajuku
                                                                    NTT


                                                       November 8, 2012

        Routing and Wavelength Assignment Information Encoding for
                   Wavelength Switched Optical Networks


                  draft-ietf-ccamp-rwa-wson-encode-19.txt


Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with
   the provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
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   This Internet-Draft will expire on May 8, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.






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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document. Please review these documents
   carefully, as they describe your rights and restrictions with
   respect to this document.  Code Components extracted from this
   document must include Simplified BSD License text as described in
   Section 4.e of the Trust Legal Provisions and are provided without
   warranty as described in the Simplified BSD License.

Abstract

   A wavelength switched optical network (WSON) requires that certain
   key information elements are made available to facilitate path
   computation and the establishment of label switching paths (LSPs).
   The information model described in "Routing and Wavelength
   Assignment Information for Wavelength Switched Optical Networks"
   shows what information is required at specific points in the WSON.
   Part of the WSON information model contains aspects that may be of
   general applicability to other technologies, while other parts are
   fairly specific to WSONs.

   This document provides efficient, protocol-agnostic encodings for
   the WSON specific information elements. It is intended that
   protocol-specific documents will reference this memo to describe how
   information is carried for specific uses. Such encodings can be used
   to extend GMPLS signaling and routing protocols. In addition these
   encodings could be used by other mechanisms to convey this same
   information to a path computation element (PCE).



Conventions used in this document

   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].

Table of Contents


   1. Introduction...................................................4
      1.1. Revision History..........................................4
         1.1.1. Changes from 00 draft................................4
         1.1.2. Changes from 01 draft................................5
         1.1.3. Changes from 02 draft................................5



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         1.1.4. Changes from 03 draft................................5
         1.1.5. Changes from 04 draft................................5
         1.1.6. Changes from 05 draft................................5
         1.1.7. Changes from 06 draft................................6
         1.1.8. Changes from 07 draft................................6
         1.1.9. Changes from 08 draft................................6
         1.1.10. Changes from 09 draft...............................6
         1.1.11. Changes from 10 draft...............................6
         1.1.12. Changes from 11 draft...............................6
         1.1.13. Changes from 12 draft...............................6
         1.1.14. Changes from 13 draft...............................7
         1.1.15. Changes from 14 draft...............................7
         1.1.16. Changes from 15 draft...............................7
         1.1.17. Changes from 16 draft...............................7
         1.1.18. Changes from 17 draft...............................7
         1.1.19. Changes from 18 draft...............................7
   2. Terminology....................................................7
   3. Resources, Blocks, Sets, and the Resource Pool.................8
      3.1. Resource Block Set Field..................................9
   4. Resource Pool Accessibility/Availability......................10
      4.1. Resource Pool Accessibility Sub-TLV......................10
      4.2. Resource Block Wavelength Constraints Sub-TLV............12
      4.3. Resource Pool State Sub-TLV..............................14
      4.4. Block Shared Access Wavelength Availability sub-TLV......15
   5. Resource Properties Encoding..................................16
      5.1. Resource Block Information Sub-TLV.......................17
      5.2. Optical Interface Class List(s) Sub-Sub-TLV..............17
         5.2.1. Optical Interface Class Format......................18
         5.2.2. ITU-G.698.1 Application Code Mapping................19
         5.2.3. ITU-G.698.2 Application Code Mapping................21
         5.2.4. ITU-G.959.1 Application Code Mapping................22
         5.2.5. ITU-G.695 Application Code Mapping..................24
      5.3. Input Client Signal List Sub-Sub-TLV.....................26
      5.4. Processing Capability List Sub-Sub-TLV...................27
         5.4.1. Processing Capabilities Field.......................27
   6. Security Considerations.......................................29
   7. IANA Considerations...........................................29
   8. Acknowledgments...............................................29
   APPENDIX A: Encoding Examples....................................30
      A.1. Wavelength Converter Accessibility Sub-TLV...............30
      A.2. Wavelength Conversion Range Sub-TLV......................31
      A.3. An OEO Switch with DWDM Optics...........................32
   9. References....................................................35
      9.1. Normative References.....................................35
      9.2. Informative References...................................35
   10. Contributors.................................................37



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   Authors' Addresses...............................................38
   Intellectual Property Statement..................................39
   Disclaimer of Validity...........................................40

1. Introduction

   A Wavelength Switched Optical Network (WSON) is a Wavelength
   Division Multiplexing (WDM) optical network in which switching is
   performed selectively based on the center wavelength of an optical
   signal.

   [RFC6163] describes a framework for Generalized Multiprotocol Label
   Switching (GMPLS) and Path Computation Element (PCE) control of a
   WSON. Based on this framework, [WSON-Info] describes an information
   model that specifies what information is needed at various points in
   a WSON in order to compute paths and establish Label Switched Paths
   (LSPs).

   This document provides efficient encodings of information needed by
   the routing and wavelength assignment (RWA) process in a WSON. Such
   encodings can be used to extend GMPLS signaling and routing
   protocols. In addition these encodings could be used by other
   mechanisms to convey this same information to a path computation
   element (PCE). Note that since these encodings are relatively
   efficient they can provide more accurate analysis of the control
   plane communications/processing load for WSONs looking to utilize a
   GMPLS control plane.

   Note that encodings of information needed by the routing and label
   assignment process applicable to general networks beyond WSON are
   addressed in a separate document [Gen-Encode].  This document makes
   use of the Label Set Field encoding of [Gen-Encode] and refers to it
   as a Wavelength Set Field.



1.1. Revision History

   1.1.1. Changes from 00 draft

   Edits to make consistent with update to [RFC6205], i.e., removal of
   sign bit.

   Clarification of TBD on connection matrix type and possibly
   numbering.




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   New sections for wavelength converter pool encoding: Wavelength
   Converter Set Sub-TLV, Wavelength Converter Accessibility Sub-TLV,
   Wavelength Conversion Range Sub-TLV, WC Usage State Sub-TLV.

   Added optional wavelength converter pool TLVs to the composite node
   TLV.

   1.1.2. Changes from 01 draft

   The encoding examples have been moved to an appendix. Classified and
   corrected information elements as either reusable fields or sub-
   TLVs. Updated Port Wavelength Restriction sub-TLV. Added available
   wavelength and shared backup wavelength sub-TLVs. Changed the title
   and scope of section 6 to recommendations since the higher level
   TLVs that this encoding will be used in is somewhat protocol
   specific.

   1.1.3. Changes from 02 draft

   Removed inconsistent text concerning link local identifiers and the
   link set field.

   Added E bit to the Wavelength Converter Set Field.

   Added bidirectional connectivity matrix example. Added simple link
   set example. Edited examples for consistency.

   1.1.4. Changes from 03 draft

   Removed encodings for general concepts to [Gen-Encode].

   Added in WSON signal compatibility and processing capability
   information encoding.

   1.1.5. Changes from 04 draft

   Added encodings to deal with access to resource blocks via shared
   fiber.

   1.1.6. Changes from 05 draft

   Revised the encoding for the "shared access" indicators to only use
   one bit each for input and output.






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   1.1.7. Changes from 06 draft

   Removed section on "WSON Encoding Usage Recommendations"

   1.1.8. Changes from 07 draft

   Section 3: Enhanced text to clarify relationship between pools,
   blocks and resources. Section 3.1, 3.2: Change title to clarify
   Pool-Block relationship. Section 3.3: clarify block-resource state.

   Section 4: Deleted reference to previously removed RBNF element.
   Fixed TLV figures and descriptions for consistent sub-sub-TLV
   nomenclature.

   1.1.9. Changes from 08 draft

   Fixed ordering of fields in second half of sub-TLV example in
   Appendix A.1.

   Clarifying edits in section 3 on pools, blocks, and resources.

   1.1.10. Changes from 09 draft

   Fixed the "Block Shared Access Wavelength Availability sub-TLV" of
   section 3.4 to use an "RB set field" rather than a single RB ID.
   Removed all 1st person idioms.

   1.1.11. Changes from 10 draft

   Removed remaining 1st person idioms. Updated IANA section. Update
   references for newly issued RFCs.

   1.1.12. Changes from 11 draft

   Fixed length fields in section 4 to be 16 bits, correcting errors in
   TLV and field figures. Added a separate section on resources,
   blocks, sets and the resource pool. Moved definition of the resource
   block set field to this new section.

   1.1.13. Changes from 12 draft

   Replaced all instances of "ingress" with "input" and all instances
   of "egress" with "output".






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   1.1.14. Changes from 13 draft

   C bit of Resource Block Set Field is redundant and was removed,
   i.e.,  has been returned to "Reserved" block and appendix examples
   were updated to reflect the change.

   Enhanced section 4.2 encoding to allow for optionality of input or
   output wavelength set fields.

   Clarified that wavelength set fields use the Label Set field
   encoding from [Gen-Encode].

   Enhanced section 5.1 encoding to simplify the Modulation and FEC
   input and output cases.

   1.1.15.  Changes from 14 draft

   OIC changes per workgroup request. Removed FEC type and modulation
   type. Fixed versioning error and return RB identifiers to 32 bits.

   1.1.16.  Changes from 15 draft

   Edits of OIC related text per CCAMP list email.

   1.1.17. Changes from 16 draft

   Added full ITU-T string to 64 bit mapping to text from OIC draft.

   1.1.18. Changes from 17 draft

   Action value for Inclusive Range(s) changed to 1 from 2 for the
   Resource Block Set Field encoding in Section 3.1.

   Added a list of contributors who provided texts for the Optical
   Interface Class (OIC) description.

   1.1.19. Changes from 18 draft

   Added Section 5.2.5 to include ITU-G.695 Application Code Mapping.



2. Terminology

   CWDM: Coarse Wavelength Division Multiplexing.




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   DWDM: Dense Wavelength Division Multiplexing.

   FOADM: Fixed Optical Add/Drop Multiplexer.

   ROADM: Reconfigurable Optical Add/Drop Multiplexer. A reduced port
   count wavelength selective switching element featuring input and
   output line side ports as well as add/drop side ports.

   RWA: Routing and Wavelength Assignment.

   Wavelength Conversion. The process of converting an information
   bearing optical signal centered at a given wavelength to one with
   "equivalent" content centered at a different wavelength. Wavelength
   conversion can be implemented via an optical-electronic-optical
   (OEO) process or via a strictly optical process.

   WDM: Wavelength Division Multiplexing.

   Wavelength Switched Optical Network (WSON): A WDM based optical
   network in which switching is performed selectively based on the
   center wavelength of an optical signal.

3. Resources, Blocks, Sets, and the Resource Pool

   The optical system to be encoded may contain a pool of resources of
   different types and properties for processing optical signals. For
   the purposes here a "resource" is an individual entity such as a
   wavelength converter or regenerator within the optical node that
   acts on an individual wavelength signal.

   Since resources tend to be packaged together in blocks of similar
   devices, e.g., on line cards or other types of modules, the
   fundamental unit of identifiable resource in this document is the
   "resource block". A resource block may contain one or more
   resources. As resource blocks are the smallest identifiable unit of
   processing resource, one should group together resources into blocks
   if they have similar characteristics relevant to the optical system
   being modeled, e.g., processing properties, accessibility, etc.

   This document defines the following sub-TLVs pertaining to resources
   within an optical node:

       Resource Pool Accessibility Sub-TLV

       Resource Block Wavelength Constraints Sub-TLV




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       Resource Pool State Sub-TLV

       Block Shared Access Wavelength Availability Sub-TLV

       Resource Block Information Sub-TLV

   Each of these sub-TLVs works with one or more sets of resources
   rather than just a single resource block. This motivates the
   following field definition.



3.1. Resource Block Set Field

   In a WSON node that includes resource blocks (RB), denoting subsets
   of these blocks allows one to efficiently describe common properties
   of the blocks and to describe the structure and characteristics, if
   non-trivial, of the resource pool. The RB Set field is defined in a
   similar manner to the label set concept of [RFC3471].

   The information carried in a RB set field is defined by:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Action     |C|  Reserved   |        Length                 |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                        RB Identifier 1                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      :                               :                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                         RB Identifier n                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


      Action: 8 bits

         0 - Inclusive List

   Indicates that the TLV contains one or more RB elements that are
   included in the list.

         1 - Inclusive Range(s)

   Indicates that the TLV contains one or more ranges of RBs.  Each
   individual range is denoted by two 32 bit RB identifier. The first



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   32 bits is the RB identifier for the start of the range and the next
   32 bits is the RB identifier for the end of the range. Note that the
   Length field is used to determine the number of ranges.

      C (Connectivity bit): Set to 0 to denote fixed (possibly multi-
   cast) connectivity; Set to 1 to denote potential (switched)
   connectivity. Used in resource pool accessibility sub-TLV. Ignored
   elsewhere.

         Reserved: 7 bits

   This field is reserved. It MUST be set to zero on transmission and
   MUST be ignored on receipt.

      Length: 16 bits

   The total length of this field in bytes.

      RB Identifier:

   The RB identifier represents the ID of the resource block which is a
   32 bit integer.

   Usage Note: the inclusive range "Action" can result in very compact
   encoding of resource sets and it can be advantages to number
   resource blocks in such a way so that status updates (dynamic
   information) can take advantage of this efficiency.

4. Resource Pool Accessibility/Availability

   This section defines the sub-TLVs for dealing with accessibility and
   availability of resource blocks within a pool of resources. These
   include the ResourceBlockAccessibility, ResourceWaveConstraints, and
   RBPoolState sub-TLVs.



4.1. Resource Pool Accessibility Sub-TLV

   This sub-TLV describes the structure of the resource pool in
   relation to the switching device. In particular it indicates the
   ability of an input port to reach sets of resources and of a sets of
   resources to reach a particular output port. This is the
   PoolInputMatrix and PoolOutputMatrix of [WSON-Info].

   The resource pool accessibility sub-TLV is defined by:



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       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Connectivity  |                    Reserved                   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    Input Link Set Field A #1                  |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                          RB Set Field A #1                    |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         Additional Link set and RB set pairs as needed to     |
      :                    specify PoolInputMatrix                  :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Output Link Set Field B #1                     |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             RB Set B Field #1 (for output connectivity)       |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         Additional Link Set and RB set pairs as needed to     |
      :                    specify PoolOutputMatrix                   :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Where

   Connectivity indicates how the input/output ports connect to the
   resource blocks.

         0 -- the device is fixed (e.g., a connected port must go
         through the resource block)

         1 -- the device is switched (e.g., a port can be configured to
         go through a resource but isn't required)

   The For the Input and Output Link Set Fields, the Link Set Field
   encoding defined in [Gen-Encode] is to be used.

   Note that the direction parameter within the Link Set Field is used
   to indicate whether the link set is an input or output link set, and
   the bidirectional value for this parameter is not permitted in this
   sub-TLV.

   See Appendix A.1 for an illustration of this encoding.





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4.2. Resource Block Wavelength Constraints Sub-TLV

   Resources, such as wavelength converters, etc., may have a limited
   input or output wavelength ranges. Additionally, due to the
   structure of the optical system not all wavelengths can necessarily
   reach or leave all the resources. These properties are described by
   using one or more resource wavelength restrictions sub-TLVs as
   defined below:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |I|O|B|                      Reserved                           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     RB Set Field                              |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Input Wavelength Set Field                     |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Output Wavelength Set Field                    |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   I = 1 or 0 indicates the presence or absence of the Input Wavelength
   Set Field.

   O = 1 or 0 indicates the presence or absence of the Output
   Wavelength Set Field.

   B = 1 indicates that a single wavelength set field represents both
   input and output wavelength constraints.

   Currently the only valid combinations of (I,O,B) are (1,0,0),
   (0,1,0), (1,1,0), (0,0,1).

      RB Set Field:

   A set of resource blocks (RBs) which have the same wavelength
   restrictions.

      Input Wavelength Set Field:






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   Indicates the wavelength input restrictions of the RBs in the
   corresponding RB set. This field is encoded via the Label Set field
   of [Gen-Encode].

      Output Wavelength Set Field:

   Indicates the wavelength output restrictions of RBs in the
   corresponding RB set. This field is encoded via the Label Set field
   of [Gen-Encode].








































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4.3. Resource Pool State Sub-TLV

   The state of the pool is given by the number of resources available
   with particular characteristics. A resource block set is used to
   encode all or a subset of the resources of interest. The usage state
   of resources within a resource block set is encoded as either a list
   of 16 bit integer values or a bit map indicating whether a single
   resource is available or in use. The bit map encoding is appropriate
   when resource blocks consist of a single resource. This information
   can be relatively dynamic, i.e., can change when a connection (LSP
   is established or torn down.

      0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Action        |    Reserved                                   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     RB Set Field                              |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  RB Usage state                               |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Where Action = 0 denotes a list of 16 bit integers and Action = 1
   denotes a bit map. In both cases the elements of the RB Set field
   are in a one-to-one correspondence with the values in the usage RB
   usage state area.

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Action = 0    |    Reserved                                   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     RB Set Field                              |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  RB#1 state   |      RB#2 state               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                 RB#n-1 state  |   RB#n state or Padding       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Whether the last 16 bits is a wavelength converter (RB) state or
   padding is determined by the number of elements in the RB set field.



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       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Action = 1    |    Reserved                                   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     RB Set Field                              |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  RB Usage state bitmap                        |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     ......             |      Padding bits    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   RB Usage state:  Variable Length but must be a multiple of 4 byes.

   Each bit indicates the usage status of one RB with 0 indicating the
   RB is available and 1 indicating the RB is in used. The sequence of
   the bit map is ordered according to the RB Set field with this sub-
   TLV.

   Padding bits: Variable Length

4.4. Block Shared Access Wavelength Availability sub-TLV

   Resources blocks may be accessed via a shared fiber. If this is the
   case, then wavelength availability on these shared fibers is needed
   to understand resource availability.

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |I|E|                          Reserved                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     RB Set Field                              |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            Input Available Wavelength Set Field               |
      :                          (Optional)                           :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Output Available Wavelength Set Field             |
      :                          (Optional)                           :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




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      I bit:

   Indicates whether the input available wavelength set field is
   included (1) or not (0).

      E bit:

   Indicates whether the output available wavelength set field is
   included (1) or not (0).

      RB Set Field:

   A Resource Block set in which all the members share the same input
   or output fiber or both.

      Input Available Wavelength Set Field:

   Indicates the wavelengths currently available (not being used) on
   the input fiber to this resource block. This field is encoded via
   the Label Set field of [Gen-Encode].

      Output Available Wavelength Set Field:

   Indicates the wavelengths currently available (not being used) on
   the output fiber from this resource block. This field is encoded via
   the Label Set field of [Gen-Encode].



5. Resource Properties Encoding

   Within a WSON network element (NE) there may be resources with
   signal compatibility constraints. These resources be regenerators,
   wavelength converters, etc... Such resources may also constitute the
   network element as a whole as in the case of an electro optical
   switch. This section primarily focuses on the signal compatibility
   and processing properties of such a resource block.

   The fundamental properties of a resource block, such as a
   regenerator or wavelength converter, are:

   (a)  Input constraints (shared input, modulation, FEC, bit rate,
        GPID)

   (b)  Processing capabilities (number of resources in a block,
        regeneration, performance monitoring, vendor specific)



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   (c)  Output Constraints (shared output, modulation, FEC)

5.1. Resource Block Information Sub-TLV

   Resource Block descriptor sub-TLVs are used to convey relatively
   static information about individual resource blocks including the
   resource block compatibility properties, processing properties, and
   the number of resources in a block.

   This sub-TLV has the following format:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     RB Set Field                              |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |I|E|                         Reserved                          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |       Optical Interface Class List(s) Sub-Sub-TLV  (opt)      |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         Input Client Signal Type Sub-Sub-TLV      (opt)       |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         Input Bit Rate Range List  Sub-Sub-TLV (opt)          |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         Processing Capabilities List Sub-Sub-TLV (opt)        |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



   Where I and E, the shared input/output indicator, is set to 1 if the
   resource blocks identified in the RB set field utilized a shared
   fiber for input/output access and set to 0 otherwise.

      5.2. Optical Interface Class List(s) Sub-Sub-TLV

   The list of Optical Interface Class sub-sub-TLV has the following
   format:







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       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |       Type    |    Length     |       Reserved            |I|E|
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |       Optical Interface Classes                               |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   The following I and E combination are defined:

   I   E

   0   0   Invalid

   1   0   Optical Interface Class List acceptable in input

   0   1   Optical Interface Class List available in output

   1   1   Optical Interface Class List available on both input and
   output.

   The Resource Block MAY contain one or more lists according to
   input/output flags.

   5.2.1. Optical Interface Class Format

     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |S|     Reserved                |    OI Code Points             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |         Optical Interface Class                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |         Optical Interface Class  (Cont.)                      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



     Where the first 32 bits of the encoding shall be used to identify
     the semantic of the Optical Interface Class in the following way:






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        S  Standard bit.

              S=0, identify not ITU code points

              S=1, identify ITU application codes

        With S=0, the OI Code Points field can take the following
     values:

           0: reserved

           1: Vendor Specific Optical Interface Class.

        With S=1, the OI Code Points field can take the following
     values:

           0: reserved

           1: [ITU-G.698.1] application code.

           2: [ITU-G.698.2] application code.

           3: [ITU-G.959.1] application code.

           4: [ITU-G.695.1] application code.

     In case of ITU Application Code, the mapping between the string
     defining the application code and the 64 bits number implementing
     the optical interface class is given in the following sections.

   5.2.2. ITU-G.698.1 Application Code Mapping

      Recommendation ITU-G.698.1 defines the Application Codes: DScW-
   ytz(v) and B-DScW-ytz(v).  Where:

      B: means Bidirectionals.

      D: means a DWDM application.

      S: take values N (narrow spectral excursion), W (wide spectral
   excursion).

      c: Channel Spacing (GHz).

      W: take values S (short-haul), L (long-haul).




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      y: take values 1 (NRZ 2.5G), 2 (indicating NRZ 10G).

      t: take only D value is defined (link does not contain optical
   amplifier)

      z: take values 2 (ITU-T G.652 fibre), 3 (ITU-T G.653 fibre), 5
   (indicating ITU-T G.655 fibre).

      v: take values S (Short wavelength), C (Conventional), L (Long
   wavelength).

      An Optional F can be added indicating a FEC Encoding.

   These get mapped into the 64 bit OIC field as follows:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |B|  p  |S|   c   |   W   |   y   |   t   |   z   |  v  |   s   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                           reserved                            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where (values between parenthesis refer to ITU defined values as
   reported above):

         B: = 1 bidirectional, 0 otherwise

         p (prefix): = 0 reserved, = 1 (D)

         S: = 0 (N), = 1 (W)

         c: Channel Spacing, 4 bits mapped according to same definition
   in [RFC6205] (note that DWDM spacing apply here)

         W: = 0 reserved, = 2 (S), = 3 (L)

         y: = 0 reserved, = 1 (1), = 2 (2)

         t: = 0 reserved, = 4 (D)

         z: = 0 reserved, = 2 (2), = 3 (3), = 5 (5)





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         v: = 0 reserved, = 1 (S), = 2 (C), = 3 (L)

         s (suffix): = 0 reserved, = 1 Fec Encoding

      Values not mentioned here are not allowed in this application
   code, the last 32 bits are reserved and shall be set to zero.

   5.2.3. ITU-G.698.2 Application Code Mapping

   Recommendation ITU-G.698.2 defines the Application Codes: DScW-
   ytz(v) and B-DScW-ytz(v).

      B: means Bidirectional.

      D: means a DWDM application.

      S: take values N (narrow spectral excursion), W (wide spectral
   excursion).

      c: Channel Spacing (GHz).

      W: take values C (link is dispersion compensated), U (link is
   dispersion uncompensated).

      y: take values 1 (NRZ 2.5G), 2 (indicating NRZ 10G).

      t: take value A (link may contains optical amplifier)

      z: take values 2 (ITU-T G.652 fibre), 3 (ITU-T G.653 fibre), 5
   (indicating ITU-T G.655 fibre).

      v: take values S (Short wavelength), C (Conventional), L (Long
   wavelength).

      An Optional F can be added indicating a FEC Encoding.

       These get mapped into the 64 bit OIC field as follows:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |B|  p  |S|   c   |   W   |   y   |   t   |   z   |  v  |   s   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                           reserved                            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



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Where (values between parenthesis refer to ITU defined values as
reported above):

         B: = 1 bidirectional, 0 otherwise

         p (prefix): = 0 reserved, = 1 (D)

         S: = 0 (N), = 1 (W)

         c: Channel Spacing, 4 bits mapped according to same definition
   in [RFC6205] (note that DWDM spacing apply here)

         W: = 0 reserved, = 10 (C), = 11 (U)

         y: = 0 reserved, = 1 (1), = 2 (2)

         t: = 0 reserved, = 1 (A)

         z: = 0 reserved, = 2 (2), = 3 (3), = 5 (5)

         v: = 0 reserved, = 1 (S), = 2 (C), = 3 (L)

         s (suffix): = 0 reserved, = 1 Fec Encoding

      Values not mentioned here are not allowed in this application
   code, the last 32 bits are reserved and shall be set to zero.

   5.2.4. ITU-G.959.1 Application Code Mapping

   Recommendation ITU-G.959.1 defines the Application Codes: PnWx-ytz
   and BnWx-ytz.  Where:

      P,B: when present indicate Plural or Bidirectional

      n: maximum number of channels supported by the application code
   (i.e. an integer number)

      W: take values I (intra-office), S (short-haul), L (long-haul), V
   (very long-haul), U (ultra long-haul).

      x: maximum number of spans allowed within the application code
   (i.e. an integer number)






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      y: take values 1 (NRZ 2.5G), 2 (NRZ 10G), 9 (NRZ 25G), 3 (NRZ
   40G), 7 (RZ 40G).



      t: take values A (power levels suitable for a booster amplifier
   in the originating ONE and power levels suitable for a pre-amplifier
   in the terminating ONE), B (booster amplifier only), C (pre-
   amplifier only), D (no amplifiers).

      z: take values 1 (1310 nm sources on ITU-T G.652 fibre), 2 (1550
   nm sources on ITU-T G.652 fibre), 3 (1550 nm sources on ITU-T
   G.653 fibre), 5 (1550 nm sources on ITU-T G.655 fibre).

      The following list of suffixes can be added to these application
   codes:

      F: FEC encoding.

      D: Adaptive dispersion compensation.

      E: receiver capable of dispersion compensation.

      r: reduced target distance.

      a: power levels appropriate to APD receivers.

      b: power levels appropriate to PIN receivers.

      These values are encoded as follows:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | p |  P  |       n           |   W   |     x     |   reserved  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |   y   |   t   |   z   |   suffix  |          reserved         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




      Where (values between parenthesis refer to ITU defined values as
   reported above):




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         p (prefix) = 0 otherwise, = 1 Bidirectional (B)

         P (optional): = 0 not present, = 2 (P).



         n: maximum number of channels (10 bits, up to 1024 channels)

         W: = 0 reserved, = 1 (I), = 2 (S), = 3 (L), = 4 (V), = 5 (U)

         x: = number of spans (6 bits, up to 64 spans)

         y: = 0 reserved, = 1 (1), = 2 (2), = 3 (3), = 7 (7), = 9 (9)

         t: = 0 reserved, = 1 (A), = 2 (B), = 3 (C), = 4 (D)

         z: = 0 reserved, = 1 (1), = 2 (2), = 3 (3), = 5 (5)



         suffix is an 6 bit, bit map:

       0 1 2 3 4 5
      +-+-+-+-+-+-+
      |F|D|E|r|a|b|
      +-+-+-+-+-+-+
   where a 1 in the appropriate slot indicates that the corresponding
   suffix has been added.



   5.2.5. ITU-G.695 Application Code Mapping


   Recommendation [ITU-G.695] defines the Application Codes: CnWx-ytz
   and B-CnWx-ytz and S-CnWx-ytz.

   Where the optional prefixed are:

      B: Bidirectional

      S: a system using a black link approach

   And the rest of the application code is defined as:




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      C: CWDM (Coarse WDM) application

      n: maximum number of channels supported by the application code
   (i.e. an integer number)

      W: take values S (short-haul), L (long-haul).

      x: maximum number of spans allowed

      y: take values 0 (NRZ 1.25G), 1 (NRZ 2.5G), 2 (NRZ 10G).

      t: take values D (link does not contain any optical amplifier).

      z: take values 1 (1310 nm region for ITU-T G.652 fibre), 2 (ITU-T
   G.652 fibre), 3 (ITU-T G.653 fibre), 5 (ITU-T G.655 fibre).

      The following list of suffixes can be added to these application
   codes:

      F: FEC encoding.

      Since the application codes are very similar to the one from the
   G.959 section most of the fields are reused. The 64 bit OIC field is
   encoded as follows:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | p |  C  |       n           |   W   |     x     |   reserved  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |   y   |   t   |   z   |   suffix  |          reserved         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




      Where (values between parenthesis refer to ITU defined values as
   reported above):

         p: = 0 no prefix, 1 = B bidirectional, = 2 S black link

         C: = 0 reserved, = 3 (C).






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         n: maximum number of channels (10 bits, up to 1024 channels)

         W: = 0 reserved, = 1 reserved, = 2 (S), = 3 (L), > 3 reserved

         x: = number of spans (6 bits, up to 64 spans)

         y: = 0 (0), = 1 (1), =2 (2), > 2 reserved

         t: = 4 (D), all other values are reserved

         z: = 0 reserved, = 1 (1), = 2 (2), = 3 (3)

         suffix is an 6 bit, bit map:

       0 1 2 3 4 5
      +-+-+-+-+-+-+
      |F|0|0|0|0|0|
      +-+-+-+-+-+-+
   where a 1 in the appropriate slot indicates that the corresponding
   suffix has been added.



5.3. Input Client Signal List Sub-Sub-TLV

   This sub-sub-TLV contains a list of acceptable input client signal
   types.

   Type := Input Client Signal List

   Value := A list of GPIDs

   The acceptable client signal list sub-TLV is a list of Generalized
   Protocol Identifiers (GPIDs). GPIDs are assigned by IANA and many
   are defined in [RFC3471] and [RFC4328].













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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Number of GPIDs         |          GPID #1              |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     :                               |                               :
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |            GPID #N            |                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where the number of GPIDs is an integer greater than or equal to
   one.


5.4. Processing Capability List Sub-Sub-TLV

   This sub-sub-TLV contains a list of resource processing
   capabilities.

   Type := Processing Capabilities List

   Value := A list of Processing Capabilities Fields

   The processing capability list sub-sub-TLV is a list of capabilities
   that can be achieved through the referred resources::

     1. Regeneration capability

     2. Fault and performance monitoring

     3. Vendor Specific capability

   Note that the code points for Fault and performance monitoring and
   vendor specific capability are subject to further study.

   5.4.1. Processing Capabilities Field

   The processing capability field is then given by:










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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Processing Cap ID    |          Length               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Possible additional capability parameters depending upon    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     :   the processing ID                                           :
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   When the processing Cap ID is "regeneration capability", the
   following additional capability parameters are provided in the sub-
   TLV:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  T  | C |                 Reserved                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where T bit indicates the type of regenerator:

      T=0: Reserved

      T=1: 1R Regenerator

      T=2: 2R Regenerator

      T=3: 3R Regenerator

   Where C bit indicates the capability of regenerator:

      C=0: Reserved

      C=1: Fixed Regeneration Point

      C=2: Selective Regeneration Point

   Note that when the capability of regenerator is indicated to be
   Selective Regeneration Pools, regeneration pool properties such as
   input and output restrictions and availability need to be specified.
   This encoding is to be determined in the later revision.





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6. Security Considerations

   This document defines protocol-independent encodings for WSON
   information and does not introduce any security issues.

   However, other documents that make use of these encodings within
   protocol extensions need to consider the issues and risks associated
   with, inspection, interception, modification, or spoofing of any of
   this information. It is expected that any such documents will
   describe the necessary security measures to provide adequate
   protection.

7. IANA Considerations

   This document provides general protocol independent information
   encodings.  There is no IANA allocation request for the TLVs defined
   in this document. IANA allocation requests will be addressed in
   protocol specific documents based on the encodings defined here.

8. Acknowledgments

   This document was prepared using 2-Word-v2.0.template.dot.



























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APPENDIX A: Encoding Examples

A.1. Wavelength Converter Accessibility Sub-TLV

   Example:

   Figure 1 shows a wavelength converter pool architecture know as
   "shared per fiber". In this case the input and output pool matrices
   are simply:

              +-----+       +-----+
              | 1 1 |       | 1 0 |
          WI =|     |,  WE =|     |
              | 1 1 |       | 0 1 |
              +-----+       +-----+


                    +-----------+                      +------+
                    |           |--------------------->|      |
                    |           |--------------------->|  C   |
              /|    |           |--------------------->|  o   |
             /D+--->|           |--------------------->|  m   |
            + e+--->|           |                      |  b   |=======>
   ========>| M|    |  Optical  |    +-----------+     |  i   | Port E1
   Port I1  + u+--->|   Switch  |    |  WC Pool  |     |  n   |
             \x+--->|           |    |  +-----+  |     |  e   |
              \|    |           +----+->|WC #1|--+---->|  r   |
                    |           |    |  +-----+  |     +------+
                    |           |    |           |     +------+
              /|    |           |    |  +-----+  |     |      |
             /D+--->|           +----+->|WC #2|--+---->|  C   |
            + e+--->|           |    |  +-----+  |     |  o   |
   ========>| M|    |           |    +-----------+     |  m   |=======>
   Port I2  + u+--->|           |                      |  b   | Port E2
             \x+--->|           |--------------------->|  i   |
              \|    |           |--------------------->|  n   |
                    |           |--------------------->|  e   |
                    |           |--------------------->|  r   |
                    +-----------+                      +------+
    Figure 1 An optical switch featuring a shared per fiber wavelength
                       converter pool architecture.


   This wavelength converter pool can be encoded as follows:





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       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Connectivity=1|                    Reserved                   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                  Note: I1,I2 can connect to either WC1 or WC2
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |0|  Reserved   |            Length = 12        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Link Local Identifier = #1                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Link Local Identifier = #2                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |1|  Reserved   |            Length = 8         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                           RB ID = #1                          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                           RB ID = #2                          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                        Note: WC1 can only connect to E1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |1|  Reserved   |            Length = 8         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Link Local Identifier = #1                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |0|  Reserved   |            Length = 8         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                            RB ID = #1                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                        Note: WC2 can only connect to E2
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |1|  Reserved   |            Length = 8         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Link Local Identifier = #2                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |0|                |            Length = 8      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                            RB ID = #2                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




A.2. Wavelength Conversion Range Sub-TLV

   Example:



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   This example, based on figure 1, shows how to represent the
   wavelength conversion range of wavelength converters. Suppose the
   wavelength range of input and output of WC1 and WC2 are {L1, L2, L3,
   L4}:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
                             Note: WC Set
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |1| Reserved    |     Length = 8                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |           WC ID = #1          |       WC ID = #2              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                             Note: wavelength input range
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | 2   | Num Wavelengths = 4     |          Length = 8           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Grid |  C.S. |     Reserved    |  n for lowest frequency = 1   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                             Note: wavelength output range
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | 2   | Num Wavelengths = 4     |          Length = 8           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Grid |  C.S. |     Reserved    |  n for lowest frequency = 1   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

A.3. An OEO Switch with DWDM Optics

   Figure 2 shows an electronic switch fabric surrounded by DWDM
   optics. In this example the electronic fabric can handle either
   G.709 or SDH signals only (2.5 or 10 Gbps). To describe this node,
   the following information is needed:

   <Node_Info> ::= <Node_ID>[Other GMPLS sub-
   TLVs][<ConnectivityMatrix>...]  [<ResourcePool>][<RBPoolState>]

   In this case there is complete port to port connectivity so the
   <ConnectivityMatrix> is not required. In addition since there are
   sufficient ports to handle all wavelength signals the <RBPoolState>
   element is not needed.

   Hence the attention will be focused on the <ResourcePool> sub-TLV:

   <ResourcePool> ::=
   <ResourceBlockInfo>[<ResourceBlockAccessibility>...][<ResourceWaveCo
   nstraints>...]



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              /|    +-----------+    +-------------+   +------+
             /D+--->|           +--->|Tunable Laser|-->|      |
            + e+--->|           |    +-------------+   |  C   |
   ========>| M|    |           |        ...           |  o   |=======>
   Port I1  + u+--->|           |    +-------------+   |  m   | Port E1
             \x+--->|           |--->|Tunable Laser|-->|  b   |
              \|    |  Electric |    +-------------+   +------+
                    |   Switch  |
              /|    |           |    +-------------+   +------+
             /D+--->|           +--->|Tunable Laser|-->|      |
            + e+--->|           |    +-------------+   |  C   |
   ========>| M|    |           |        ...           |  o   |=======>
   Port I2  + u+--->|           |    +-------------+   |  m   | Port E2
             \x+--->|           +--->|Tunable Laser|-->|  b   |
              \|    |           |    +-------------+   +------+
                    |           |
              /|    |           |    +-------------+   +------+
             /D+--->|           |--->|Tunable Laser|-->|      |
            + e+--->|           |    +-------------+   |  C   |
   ========>| M|    |           |        ...           |  o   |=======>
   Port I3  + u+--->|           |    +-------------+   |  m   | Port E3
             \x+--->|           |--->|Tunable Laser|-->|  b   |
              \|    +-----------+    +-------------+   +------+

      Figure 2 An optical switch built around an electronic switching
                                  fabric.

   The resource block information will tell us about the processing
   constraints of the receivers, transmitters and the electronic
   switch. The resource availability information, although very simple,
   tells us that all signals must traverse the electronic fabric (fixed
   connectivity). The resource wavelength constraints are not needed
   since there are no special wavelength constraints for the resources
   that would not appear as port/wavelength constraints.

   <ResourceBlockInfo>:













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       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     RB Set Field                              |
      :  (only one resource block in this example with shared         |
      |                     input/output case)                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |1|1|                   Reserved                                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |       Optical Interface Class List(s) Sub-Sub-TLV             |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |              Input Client Signal Type Sub-TLV                 |
      :              (GPIDs for SDH and G.709)                        :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |           Input Bit Rate Range List  Sub-Sub-TLV              |
      :                       (2.5Gbps, 10Gbps)                       :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         Processing Capabilities List Sub-Sub-TLV              |
      :                    Fixed (non optional) 3R regeneration       :
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Since there is fixed connectivity to resource blocks (the electronic
   switch) the <ResourceBlockAccessibility> is:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Connectivity=0|Reserved       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    Input Link Set Field A #1                  |
      :                    (All input links connect to resource)      :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                          RB Set Field A #1                    |
      :              (trivial set only one resource block)            :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Output Link Set Field B #1                     |
      :                    (All output links connect to resource)     :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+









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9. References

9.1. Normative References

   [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
             Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
             "Structure of Management Information Version 2 (SMIv2)",
             STD 58, RFC 2578, April 1999.

   [RFC3471] Berger, L., "Generalized Multi-Protocol Label Switching
             (GMPLS) Signaling Functional Description", RFC 3471,
             January 2003.

   [RFC4328] Papadimitriou, D., Ed., "Generalized Multi-Protocol Label
             Switching (GMPLS) Signaling Extensions for G.709 Optical
             Transport Networks Control", RFC 4328, January 2006.

9.2. Informative References

   [G.694.1] ITU-T Recommendation G.694.1, Spectral grids for WDM
             applications: DWDM frequency grid, June 2002.

   [G.694.2] ITU-T Recommendation G.694.2, Spectral grids for WDM
             applications: CWDM wavelength grid, December 2003.

   [G.695]   ITU-T Recommendation G.695, Optical interfaces for coarse
             wavelength division multiplexing applications, October,
             2010.

   [G.959.1] ITU-T Recommendation G.959.1, Optical transport network
             physical layer interfaces, February, 2012.

   [Gen-Encode]   G. Bernstein, Y. Lee, D. Li, W. Imajuku, "General
             Network Element Constraint Encoding for GMPLS Controlled
             Networks", work in progress: draft-ietf-ccamp-general-
             constraint-encode.

   [RFC6205]   T. Otani, H. Guo, K. Miyazaki, D. Caviglia, "Generalized
             Labels for G.694 Lambda-Switching Capable Label Switching
             Routers", RFC 6205, March 2011.





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   [RFC6163]  Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS
             and PCE Control of Wavelength Switched Optical Networks",
             RFC 6163, April 2011.

   [WSON-Info] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and
             Wavelength Assignment Information Model for Wavelength
             Switched Optical Networks", work in progress: draft-ietf-
             ccamp-rwa-info.









































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10. Contributors

   Diego Caviglia
   Ericsson
   Via A. Negrone 1/A 16153
   Genoa Italy

   Phone: +39 010 600 3736
   Email: diego.caviglia@(marconi.com, ericsson.com)

   Anders Gavler
   Acreo AB
   Electrum 236
   SE - 164 40 Kista Sweden

   Email: Anders.Gavler@acreo.se

   Jonas Martensson
   Acreo AB
   Electrum 236
   SE - 164 40 Kista, Sweden

   Email: Jonas.Martensson@acreo.se

   Itaru Nishioka
   NEC Corp.
   1753 Simonumabe, Nakahara-ku, Kawasaki, Kanagawa 211-8666
   Japan

   Phone: +81 44 396 3287
   Email: i-nishioka@cb.jp.nec.com

   Pierre Peloso
   ALU

   Email: pierre.peloso@alcatel-lucent.com

   Cyril Margaria
   NSN

   Email: cyril.margaria@nsn.com


   Giovanni Martinelli





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   Cisco
   Email: giomarti@cisco.com


   Gabriele M Galimberti
   Cisco
   Email: ggalimbe@cisco.com

   Lyndon Ong
   Ciena Corporation
   Email: lyong@ciena.com

   Daniele Ceccarelli
   Ericsson
   Email: daniele.ceccarelli@ericsson.com



Authors' Addresses

   Greg M. Bernstein (ed.)
   Grotto Networking
   Fremont California, USA

   Phone: (510) 573-2237
   Email: gregb@grotto-networking.com


   Young Lee (ed.)
   Huawei Technologies
   5340 Legacy Drive Build 3
   Plano, TX 75024
   USA

   Phone: (469) 277-5838
   Email: leeyoung@huawei.com











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   Dan Li
   Huawei Technologies Co., Ltd.
   F3-5-B R&D Center, Huawei Base,
   Bantian, Longgang District
   Shenzhen 518129 P.R.China

   Phone: +86-755-28973237
   Email: danli@huawei.com

   Wataru Imajuku
   NTT Network Innovation Labs
   1-1 Hikari-no-oka, Yokosuka, Kanagawa
   Japan

   Phone: +81-(46) 859-4315
   Email: imajuku.wataru@lab.ntt.co.jp



   Jianrui Han
   Huawei Technologies Co., Ltd.
   F3-5-B R&D Center, Huawei Base,
   Bantian, Longgang District
   Shenzhen 518129 P.R.China

   Phone: +86-755-28972916
   Email: hanjianrui@huawei.com


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   IPR repository at http://www.ietf.org/ipr




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