Network Working Group                                      G. Bernstein
Internet Draft                                        Grotto Networking
Intended status: Standards Track                                 Y. Lee
Expires: August 2015                                              D. Li
                                                                 Huawei
                                                             W. Imajuku
                                                                    NTT


                                                      February 24, 2015

        Routing and Wavelength Assignment Information Encoding for
                   Wavelength Switched Optical Networks


                  draft-ietf-ccamp-rwa-wson-encode-28.txt


Abstract

   A wavelength switched optical network (WSON) requires that certain
   key information fields 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
   specific to WSONs.

   This document provides efficient, protocol-agnostic encodings for
   the WSON-specific information fields. 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).



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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   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six
   months and may be updated, replaced, or obsoleted by other documents
   at any time.  It is inappropriate to use Internet-Drafts as
   reference material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html

   This Internet-Draft will expire on August 24, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.



   This document is subject to BCP 78 and the IETF Trust's Legal
   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.



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...................................................3
   1.1. Terminology..................................................4



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   2. Resources, Resource Blocks, and the Resource Pool..............4
      2.1. Resource Block Set Field..................................5
   3. Resource Accessibility/Availability............................6
      3.1. Resource Accessibility Field..............................6
      3.2. Resource Wavelength Constraints Field.....................8
      3.3. Resource Block Pool State (RBPoolState) Field.............9
      3.4. Resource Block Shared Access Wavelength Availability
      (RBSharedAccessWaveAvailability) Field........................11
   4. Resource Block Information (ResourceBlockInfo) Field..........12
      4.1. Optical Interface Class List Subfield....................14
            4.1.1. ITU-G.698.1 Application Code Mapping.............16
            4.1.2. ITU-G.698.2 Application Code Mapping.............18
            4.1.3. ITU-G.959.1 Application Code Mapping.............19
             ITU-G.695 Application Code Mapping.....................22
            4.1.4...................................................22
         4.2. Acceptable Client Signal List Subfield................24
         4.3. Input Bit Rate List Subfield..........................24
         4.4. Processing Capability List Subfield...................25
   5. Security Considerations.......................................27
   6. IANA Considerations...........................................27
      6.1. Types for subfields of WSON Resource Block Information...27
   7. Acknowledgments...............................................28
   APPENDIX A: Encoding Examples....................................29
      A.1. Wavelength Converter Accessibility Field.................29
      A.2. Wavelength Conversion Range Field........................31
      A.3. An OEO Switch with DWDM Optics...........................31
   8. References....................................................35
      8.1. Normative References.....................................35
      8.2. Informative References...................................35
   9. Contributors..................................................37
   Authors' Addresses...............................................38

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, [RWA-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).




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   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 efficient they
   can provide more accurate analysis of the control plane
   communications/processing load for WSONs looking to utilize a GMPLS
   control plane.

   In parallel to this document, [Gen-Encode] provides efficient
   encodings of information needed by the routing and label assignment
   process that are potentially applicable to a wider range of
   technologies.

1.1. Terminology

   Refer to [RFC6163] for CWDM, DWDM, RWA, WDM.

   Refer to Section 5 of [RWA-Info] for the terminology of Resources,
   Resource Blocks, and Resource Pool.



2. Resources, Resource Blocks, and the Resource Pool

   This section provides encodings for the information fields defined
   in [RWA-Info] that have applicability to WSON.  The encodings are
   designed to be suitable for use in the GMPLS routing protocols OSPF
   [RFC4203] and IS-IS [RFC5307] and in the PCE protocol (PCEP)
   [RFC5440]. Note that the information distributed in [RFC4203] and
   [RFC5307] is arranged via the nesting of sub-TLVs within TLVs and
   this document defines elements to be used within such constructs.
   Specific constructs of sub-TLVs and the nesting of sub-TLVs of the
   information field defined by this document will be defined in the
   respective protocol enhancement documents.

   This document defines the following information fields pertaining to
   resources within an optical node:

     . Resource Accessibility <ResourceAccessibility>

     . Resource Wavelength Constraints <ResourceWaveConstraints>

     . Resource Block Pool State <RBPoolState>




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     . Resource Block Shared Access Wavelength Availability
        <RBSharedAccessWaveAvailability>

     . Resource Block Information <ResourceBlockInfo>

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



2.1. 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 an 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
   32 bits is the RB identifier for the start of the range and the next



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   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 Accessibility field. 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. The scope of the RB identifier is local to the node
   on which it is applied.

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

3. Resource Accessibility/Availability

   This section defines the information fields for dealing with
   accessibility and availability of resource blocks within a pool of
   resources. These include the ResourceAccessibility,
   ResourceWaveConstraints, and RBPoolState fields.



3.1. Resource Accessibility Field

   This information field 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 sets of
   resources to reach a particular output port. This is the
   PoolInputMatrix and PoolOutputMatrix of [RWA-Info].

   The Resource Accessibility field 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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Reserved(8bits)|C|             Reserved (23 bits)              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    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


   C (Connectivity bit): 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)

   For the Input and Output Link Set Fields, the Link Set Field
   encoding defined in [Gen-Encode] is to be used. A Label Set Field
   MUST carry a label as defined in [RFC6205].










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   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
   field.

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


3.2. Resource Wavelength Constraints Field

   Resources, such as wavelength converters, etc., may have 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 fields 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 Constraints                   |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Output Wavelength Constraints                  |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   I = 1 indicates the presence of the Input Wavelength Constraints
   Field and I = 0 indicates otherwise.

   O = 1 indicates the presence of the Output Wavelength Constraints
   Field and O = 0 indicates otherwise.

   B = 1 indicates that a single wavelength constraints field
   represents both Input and Output Wavelength Constraints Fields.

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



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      RB Set Field:

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

      Input Wavelength Constraints Field:

   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 Constraints 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].

3.3. Resource Block Pool State (RBPoolState) Field

   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. Action = 0 covers the case where there are
   multiple elements for each resource block. Action = 1 covers the
   case where each resource block only contains a single element.




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   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       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   RB#i State (16 bits, unsigned integer): indicates the number of
   resources available in Resource Block #i.

   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.

       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 use. The sequence of
   the bit map is ordered according to the RB Set field with this
   element.




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   Padding bits: Variable Length

3.4. Resource Block Shared Access Wavelength Availability
   (RBSharedAccessWaveAvailability) Field

   Resource 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|O|B|                        Reserved                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     RB Set Field                              |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            Input Available Wavelength Set Field               |
      :                          (Optional)                           :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Output Available Wavelength Set Field             |
      :                          (Optional)                           :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


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

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

   B = 1 indicates that a single Available Wavelength Set Field
   represents both Input and Output Available Wavelength Set Fields.

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

      Input Available Wavelength Set Field:






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   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].



4. Resource Block Information (ResourceBlockInfo) Field

   As defined in [RWA-Info], the Resource Block Information
   <ResourceBlockInfo> field is used to represent resource signal
   constraints and processing capabilities of a node.


   The fundamental properties of a resource block are:

     (a) Optical Interface Class List(s)
     (b) Acceptable Client Signal (shared input, modulation, FEC, bit
        rate, G-PID)
     (c) Input Bit Rate
     (d) Processing Capabilities (number of resources in a block,
        regeneration, performance monitoring, vendor specific)


   ResourceBlockInfo fields are used to convey relatively static
   information about individual resource blocks including the resource
   block properties and the number of resources in a block.

   When more than one ResourceBlockInfo field is used, there are no
   ordering requirements amongst these fields. The length of the
   ResourceBlockInfo field is determined from the length of the object
   that includes it.

   This ResourceBlockInfo field 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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                          RB Set Field                         |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |I|O|B|                       Reserved                          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                        Optional subfield 1                    |
      :                              ...                              :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      :                               :                               :
      :                               :                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                        Optional subfield N                    |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   RB Set Field is described in Section 2.1.

   The shared input or output indication is indicated by the first bit
   (I), the second bit (O) and the third bit (B):

   I = 1 indicates if the resource blocks identified in the RB set
   field utilized a shared fiber for input access and and I = 0
   indicates otherwise.

   O = 1 indicates if the resource blocks identified in the RB set
   field utilized a shared fiber for output access and O = 0 indicates
   otherwise.

   B = 1 indicates if the resource blocks identified in the RB set
   field utilized a shared fiber for both input and output access and B
   = 0 indicates otherwise.

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

   Zero or more Optional subfields MAY be present. Optional subfields
   have 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            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                            Value...                           |
      .                                                               .
      .                                                               .
      .                                                               .
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   The Length field defines the length of the value portion in bytes
   (thus a subfield with no value portion would have a length of zero).
   The subfield is padded to four-byte alignment; padding is not
   included in the Length field (so a three byte value would have a
   length of three, but the total size of the subfield would be eight
   byte).  Unrecognized types are not processed. If multiple subfields
   of the same type are present, only the first of the type SHOULD be
   processed.

   The following subfield Types are defined:

      Value          Length      Sub-TLV Type

       1             variable    Optical Interface Class List
       2             variable    Acceptable Client Signal List
       3             variable    Input Bit Rate List
       4             variable    Processing Capability List

     See the IANA Considerations section for allocation of new Types.



4.1. Optical Interface Class List Subfield

   The Optical Interface Class subfield 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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                           Reserved                        |I|O|
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                   Optical Interface Classes                   |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   The following I and O combination are defined:

   I   O

   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 the
   input/output flags.

   The Optical Interface Classes format is defined 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |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 semantics of the Optical Interface Class in the following way:






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        S  Standard bit.

              S=0, identify non-ITU code points

              S=1, identify ITU application codes

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

           0: reserved

           Future work may add support for vendor-specific AI once the
     ITU-T has completed its work in that area.


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

           0: reserved

           1: [G.698.1] application code.

           2: [G.698.2] application code.

           3: [G.959.1] application code.

           4: [G.695] application code.

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



   4.1.1. ITU-G.698.1 Application Code Mapping

      [698.1] defines the Application Codes: DScW-ytz(v) and B-DScW-
      ytz(v).  Where:

      B: means Bidirectional.

      D: means a DWDM application.

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



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      c: Channel Spacing (GHz).

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

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

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

      z: takes values 2 ([G.652] fibre), 3 ([G.653] fibre), 5
   (indicating [G.655] fibre).

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

      The F flag indicates the presence or absence of an optional FEC
   Encoding suffix.


   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|  D  |S|   c   |   W   |   y   |   t   |   z   |  v  |   F   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                           reserved                            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where values between parentheses refer to ITU defined values as
   reported above:

         B: = 1 bidirectional, 0 otherwise

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

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

         c: Channel Spacing, 4 bits mapped according to the same
   definition as in Figure 2 in Section 3.2 of [RFC6205] (note that
   DWDM spacing applies here)

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




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

         t: = 0 reserved, = 4 (D)

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

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

         F (suffix): = 0 No FEC Encoding suffix present, = 1 FEC
   Encoding suffix present

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



   4.1.2. ITU-G.698.2 Application Code Mapping

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

      B: means Bidirectional.

      D: means a DWDM application.

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

      c: Channel Spacing (GHz).

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

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

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

      z: takes values 2 ([G.652] fibre), 3 ([G.653] fibre), 5
   (indicating [G.655] fibre).

      v: takes 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:



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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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |B|  D  |S|   c   |   W   |   y   |   t   |   z   |  v  |   F   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                           reserved                            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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

         B: = 1 bidirectional, 0 otherwise

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

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

         c: Channel Spacing, 4 bits mapped according to the same
   definition as in Figure 2 in Section 3.2 of [RFC6205] (note that
   DWDM spacing applies 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)

         F (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.

   4.1.3. ITU-G.959.1 Application Code Mapping

   [G.959.1] defines the Application Codes: PnWx-ytz and BnWx-ytz.
   Where:

      P,B: when present indicate Plural or Bidirectional






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

      W: takes 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)

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



      t: takes 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: takes values 1 (1310 nm sources on [G.652] fibre), 2 (1550
   nm sources on [G.652] fibre), 3 (1550 nm sources on [G.653] fibre),
   5 (1550 nm sources on [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:










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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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | p |  P  |       n           |   W   |     x     |   reserved  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |   y   |   t   |   z   |   suffix  |          reserved         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




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

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

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



         n: maximum number of channels (10 bits, up to 1023 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 a 6-bit bitmap:

       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.







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   4.1.4. ITU-G.695 Application Code Mapping

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

   Where the optional prefixes are:

      B: Bidirectional

      S: a system using a black link approach

   And the rest of the application code is defined as:

      C: CWDM (Coarse WDM) application

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

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

      x: maximum number of spans allowed

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

      t: takes value D (link does not contain any optical amplifier).

      z: takes values 1 (1310 nm region for [G.652] fibre), 2 (ITU-T
   [G.652] fibre), 3 ([G.653] fibre), 5 ([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 ones from the
   [G.959] section most of the fields are reused. The 64-bit OIC field
   is 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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | p |  C  |       n           |   W   |     x     |   reserved  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |   y   |   t   |   z   |   suffix  |          reserved         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




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

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

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



         n: maximum number of channels (10 bits, up to 1023 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 a 6-bit bitmap:

       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.









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4.2. Acceptable Client Signal List Subfield

   This subfield contains a list of acceptable input client signal
   types.

   The acceptable client signal list is a list of Generalized Protocol
   Identifiers (G-PIDs).

      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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |            Reserved           |       Number of G-PIDs        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |            G-PID #1           |          G-PID #2             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     :                               |                               :
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |            G-PID #N           |                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Type (16 bits):  identifies the Acceptable Client Signal List field.

   Length (16 bits): The Length field defines the length of the value
   portion in octets.

   The number of G-PIDs is an integer greater than or equal to one.

   G-PIDs are assigned by IANA and many are defined in [RFC3471] and
   [RFC4328].



4.3. Input Bit Rate List Subfield

   This subfield contains a list of bit rates of each input client
   signal type specified in the Input Client Signal List.

   The number of Input Bit Rates MUST match the number of G-PIDs.








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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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                   Input Bit Rate of G-PID #1                  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     :                                                               :
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                   Input Bit Rate of G-PID #N                  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Input Bit Rates are in IEEE 754 floating point format [IEEE].



4.4. Processing Capability List Subfield

   The processing capability list field 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

   Fault and performance monitoring and Vendor specific capability have
   no additional capability parameters.

   The processing capability list field is then given 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |            Reserved           |        Processing Cap ID      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Possible additional capability parameters depending upon    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     :   the processing ID                                           :
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+








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   The processing capability ID field defines the following processing
   capabilities:

        0: Reserved

        1: Regeneration capability

        2: Fault and performance monitoring

        3: Vendor specific capability

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

      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 the T bit indicates the type of regenerator:

      T=0: Reserved

      T=1: 1R Regenerator

      T=2: 2R Regenerator

      T=3: 3R Regenerator

   Where the C bit indicates the capability of the regenerator:

      C=0: Reserved

      C=1: Fixed Regeneration Point

      C=2: Selective Regeneration Pools

   Note that when the capability of the regenerator is indicated to be
   Selective Regeneration Pools, regeneration pool properties such as
   input and output restrictions and availability need to be specified.
   These properties will be encoded in the capabilities field starting
   with the bits marked Reserved in the figure. An additional




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   specification describing the encoding of these parameters is
   required before the value C=2 can be used.



5. 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. A general discussion on security in GMPLS networks can
   be found in [RFC5920].



6. IANA Considerations

   This document introduces a new top-level registry for GMPLS routing
   parameters for WSON encoding. This new IANA registry will be created
   to make the assignment of a new type and new values for the new
   "GMPLS Routing Parameters for WSON". Note that this registry is only
   used in routing, not in signaling.



6.1. Types for subfields of WSON Resource Block Information

   Under this new GMPLS Routing Parameters for WSON, a new IANA
   registry will be created for nested subfields of the Resource Block
   Information field to create a new section named "Types for subfields
   of WSON Resource Block Information Registry". The new registry will
   be maintained via Standards Action as defined by [RFC5226].

   There are initial values in the new registry as follows:

   Value          Length      Sub-TLV Type                  Reference

   0                          Reserved
   1              variable    Optical Interface Class List [This.I-D]
   2              variable    Acceptable Client
                              Signal List                  [This.I-D]



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   3              variable    Input Bit Rate List          [This.I-D]
   4              variable    Processing Capability List   [This.I-D]
   5-65535                    Unassigned





7. 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 Field

   Example:

   Figure 1 shows a wavelength converter pool architecture known 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 O1
   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 O2
             \x+--->|           |--------------------->|  i   |
              \|    |           |--------------------->|  n   |
                    |           |--------------------->|  e   |
                    |           |--------------------->|  r   |
                    +-----------+                      +------+
    Figure 1 An optical switch featuring a shared per fiber wavelength
                       converter pool architecture.








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   The wavelength converters are resource blocks and the wavelength
   converter pool is a resource block pool. This can be 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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Reserved |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 O1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  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 O2
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |1|  Reserved   |            Length = 8         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Link Local Identifier = #2                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |0|                |            Length = 8      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                            RB ID = #2                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




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A.2. Wavelength Conversion Range Field

   Example:

   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 in RBNF form [RFC5511] is needed:

   <Node_Info> ::= <Node_ID>

                   [Other GMPLS info-elements]

                   [<ConnectivityMatrix>...]

                   [<ResourcePool>]



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                   [<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> field:

   <ResourcePool> ::= <ResourceBlockInfo>

                      [<RBAccessibility>...]

                      [<ResourceWaveConstraints>...]



              /|    +-----------+    +-------------+   +------+
             /D+--->|           +--->|Tunable Laser|-->|      |
            + e+--->|           |    +-------------+   |  C   |
   ========>| M|    |           |        ...           |  o   |=======>
   Port I1  + u+--->|           |    +-------------+   |  m   | Port O1
             \x+--->|           |--->|Tunable Laser|-->|  b   |
              \|    |  Electric |    +-------------+   +------+
                    |   Switch  |
              /|    |           |    +-------------+   +------+
             /D+--->|           +--->|Tunable Laser|-->|      |
            + e+--->|           |    +-------------+   |  C   |
   ========>| M|    |           |        ...           |  o   |=======>
   Port I2  + u+--->|           |    +-------------+   |  m   | Port O2
             \x+--->|           +--->|Tunable Laser|-->|  b   |
              \|    |           |    +-------------+   +------+
                    |           |
              /|    |           |    +-------------+   +------+
             /D+--->|           |--->|Tunable Laser|-->|      |
            + e+--->|           |    +-------------+   |  C   |
   ========>| M|    |           |        ...           |  o   |=======>
   Port I3  + u+--->|           |    +-------------+   |  m   | Port O3
             \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



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   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>:

       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|0|                 Reserved                                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                 Optical Interface Class List(s)               |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    Input Client Signal Type                   |
      :                   (G-PIDs for SDH and G.709)                  :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    Input Bit Rate Range List                  |
      :                       (2.5Gbps, 10Gbps)                       :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                   Processing Capabilities List                |
      :              Fixed (non optional) 3R regeneration             :
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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
















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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=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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8. References

8.1. Normative References

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

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

   [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.

   [RWA-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.

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

8.2. Informative References



   [IEEE]    IEEE, "IEEE Standard for Binary Floating-Point
             Arithmetic", Standard 754-1985, 1985 (ISBN 1-5593-7653-8).

   [G.652] ITU-T Recommendation G.652, Characteristics of a single-mode
             optical fibre and cable, September, 2011.

   [G.653] ITU-T Recommendation G.653, Characteristics of a dispersion-
             shifted, single-mode optical fibre and cable, July,
             2010.

   [G.655] ITU-T Recommendation G.655, Characteristics of a non-zero
             dispersion-shifted single-mode optical fibre and cable,
             September, 2011.





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   [G.698.1] ITU-T Recommendation G.698.1, Spectral grids for WDM
             applications: DWDM frequency grid, June 2002.

   [G.698.2] ITU-T Recommendation G.698.2, 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.

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

   [RFC4203] Kompella, L. and Y. Rekhter, Eds., "OSPF Extensions in
             Support of Generalized Multi-Protocol Label Switching
             (GMPLS)", RFC 4203, October 2005.

   [RFC5226] Narten, T., Alvestrand, H., "Guidelines for Writing an
             IANA Considerations Section in RFCs", RFC 5226, May 2008.

   [RFC5307] Kompella, L. and Y. Rekhter, Eds., "IS-IS Extensions in
             Support of Generalized Multi-Protocol Label Switching
             (GMPLS)", RFC 5307, October, 2008.

   [RFC5440] Vasseur, JP. and Le Roux,  JL., Eds., "Path Computation
             Element (PCE) Communication Protocol (PCEP)", RFC 5440,
             March 2009.

   [RFC5511] A. Farrel, "Routing Backus-Naur Form (RBNF): A Syntax Used
             to Form Encoding Rules in Various Routing Protocol Specifications",
             RFC 5511, April 2009.

   [RFC5920] L. Fang, Ed., "Security Framework for MPLS and GMPLS
             Networks", RFC 5920, July 2010.



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





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9. Contributors

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

   Phone: +39 010 600 3736
   Email: diego.caviglia@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
   Email: cyril.margaria@gmail.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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