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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: January 2010                                             D. Li
                                                                 Huawei
                                                             W. Imajuku
                                                                    NTT


                                                          July 10, 2009

        Routing and Wavelength Assignment Information Encoding for
                   Wavelength Switched Optical Networks


                  draft-ietf-ccamp-rwa-wson-encode-02.txt


Status of this Memo

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Copyright Notice

   Copyright (c) 2009 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 in effect on the date of



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   publication of this document (http://trustee.ietf.org/license-info).
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.

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.

   The information may be used in Generalized Multiprotocol Label
   Switching (GMPLS) signaling protocols, and may be distributed by
   GMPLS routing protocols. Other distribution mechanisms (for example,
   XML-based protocols) may also be used.

   This document provides efficient, protocol-agnostic encodings for the
   information elements necessary to operate a WSON. It is intended that
   protocol-specific documents will reference this memo to describe how
   information is carried for specific uses.



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. Revision History..........................................4
         1.1.1. Changes from 00 draft................................4
         1.1.2. Changes from 01 draft................................4
   2. Terminology....................................................4
   3. Common Field Encoding..........................................5
      3.1. Link Set Field............................................5
      3.2. Wavelength Information Encoding...........................7
      3.3. Wavelength Set Field......................................8
         3.3.1. Inclusive/Exclusive Wavelength Lists.................9
         3.3.2. Inclusive/Exclusive Wavelength Ranges................9
         3.3.3. Bitmap Wavelength Set...............................10



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   4. Wavelength and Connectivity sub-TLV Encodings.................10
      4.1. Available Wavelengths Sub-TLV............................11
      4.2. Shared Backup Wavelengths Sub-TLV........................11
      4.3. Connectivity Matrix Sub-TLV..............................11
      4.4. Port Wavelength Restriction sub-TLV......................12
         4.4.1. SIMPLE_WAVELENGTH...................................13
         4.4.2. CHANNEL_COUNT.......................................14
         4.4.3. WAVEBAND1...........................................14
         4.4.4. SIMPLE_WAVELENGTH & CHANNEL_COUNT...................14
   5. Wavelength Converter Pool Encoding............................15
      5.1. Wavelength Converter Set Field...........................15
      5.2. Wavelength Converter Accessibility Sub-TLV...............16
      5.3. Wavelength Conversion Range Sub-TLV......................17
      5.4. Wavelength Converter Usage State Sub-TLV.................18
   6. WSON Encoding Usage Recommendations...........................19
      6.1. WSON Node TLV............................................19
      6.2. WSON Dynamic Node TLV....................................19
      6.3. WSON Link TLV............................................20
      6.4. WSON Dynamic Link TLV....................................20
   7. Security Considerations.......................................20
   8. IANA Considerations...........................................20
   9. Acknowledgments...............................................21
   APPENDIX A: Encoding Examples....................................22
      A.1. Wavelength Set Field.....................................22
      A.2. Connectivity Matrix Sub-TLV..............................22
      A.3. Wavelength Converter Accessibility Sub-TLV...............26
      A.4. Wavelength Conversion Range Sub-TLV......................28
   10. References...................................................30
      10.1. Normative References....................................30
      10.2. Informative References..................................30
   11. Contributors.................................................32
   Authors' Addresses...............................................32
   Intellectual Property Statement..................................33
   Disclaimer of Validity...........................................34

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.

   [WSON-Frame] 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




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   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.

1.1. Revision History

   1.1.1. Changes from 00 draft

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

   Clarification of TBD on connection matrix type and possibly
   numbering.

   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.

2. Terminology

   CWDM: Coarse Wavelength Division Multiplexing.

   DWDM: Dense Wavelength Division Multiplexing.

   FOADM: Fixed Optical Add/Drop Multiplexer.



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   ROADM: Reconfigurable Optical Add/Drop Multiplexer. A reduced port
   count wavelength selective switching element featuring ingress and
   egress 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. Common Field Encoding

   In encoding WSON information both sets of links and sets of
   wavelengths frequently arise. In the following we specify the
   encoding of these repeatedly used fields.



3.1. Link Set Field

   We will frequently need to describe properties of groups of links. To
   do so efficiently we can make use of a link set concept similar to
   the label set concept of [RFC3471]. All links will be denoted by
   their local link identifier as defined an used in [RFC4202],
   [RFC4203], and [RFC5307].The information carried in a Link Set 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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Action     |Dir|  Format   |         Length                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       Link Identifier 1                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      :                               :                               :
      :                               :                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       Link Identifier N                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


     Action: 8 bits

         0 - Inclusive List

   Indicates that one or more link identifiers are included in the Link
   Set. Each identifies a separate link that is part of the set.

         1 - Inclusive Range

   Indicates that the Link Set defines a range of links.  It contains
   two link identifiers. The first identifiers indicates the start of
   the range (inclusive). The second identifiers indicates the end of
   the range (inclusive). All links with numeric values between the
   bounds are considered to be part of the set. A value of zero in
   either position indicates that there is no bound on the corresponding
   portion of the range. Note that the Action field can be set to
   0x02(Inclusive Range) only when unnumbered link identifier is used.

     Dir: Directionality of the Link Set (2 bits)

        0 -- bidirectional
         1 -- incoming

         2 -- outgoing

   In optical networks we think in terms of unidirectional as well as
   bidirectional links. For example, wavelength restrictions or
   connectivity may be different for an ingress port, than for its
   "companion" egress port if one exists. Note that "interfaces" such as
   those discussed in the Interfaces MIB [RFC2863] are assumed to be




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   bidirectional. This also applies to the links advertised in various
   link state routing protocols.

     Format: The format of the link identifier (6 bits)

   0 -- Link Local Identifier

   Indicates that the links in the Link Set are identified by link local
   identifiers. All link local identifiers are supplied in the context
   of the advertising node.

   1 -- Local Interface IPv4 Address

  2 -- Local Interface IPv6 Address

   Indicates that the links in the Link Set are identified by Local
   Interface IP Address. All Local Interface IP Address are supplied in
   the context of the advertising node.

         Others TBD.

   Note that all link identifiers in the same list must be of the same
   type.

     Length: 16 bits

   This field indicates the total length of the Link Set field.

     Link Identifier: length is dependent on the link format

   The link identifier represents the port which is being described
   either for connectivity or wavelength restrictions. This can be the
   link local identifier of [RFC4202], GMPLS routing, [RFC4203] GMPLS
   OSPF routing, and [RFC5307] IS-IS GMPLS routing. The use of the link
   local identifier format can result in more compact WSON encodings
   when the assignments are done in a reasonable fashion.

3.2. Wavelength Information Encoding

   This document makes frequent use of the lambda label format defined
   in [Otani] shown below strictly for reference purposes:








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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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |  Reserved       |               n               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   Where

   Grid is used to indicate which ITU-T grid specification is being
   used.

   C.S. = Channel spacing used in a DWDM system, i.e., with a ITU-T
   G.694.1 grid.

   n = Used to specify the frequency as 193.1THz +/- n*(channel spacing)
   and n is an integer to take either a negative, zero or a positive
   value.

3.3. Wavelength Set Field

   Wavelength sets come up frequently in WSONs to describe the range of
   a laser transmitter, the wavelength restrictions on ROADM ports, or
   the availability of wavelengths on a DWDM link. The general format
   for a wavelength set is given below. This format uses the Action
   concept from [RFC3471] with an additional Action to define a "bit
   map" type of label set. Note that the second 32 bit field is a lambda
   label in the previously defined format. This provides important
   information on the WDM grid type and channel spacing that will be
   used in the compact encodings listed.

      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|    Num Wavelengths    |          Length               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |    Reserved     |  n  for lowest frequency      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Additional fields as necessary per action                 |
     |



   Action:

         0 - Inclusive List

         1 - Exclusive List



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         2 - Inclusive Range

         3 - Exclusive Range

         4 - Bitmap Set

   3.3.1. Inclusive/Exclusive Wavelength Lists

   In the case of the inclusive/exclusive lists the wavelength set
   format is 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0 or 1 | Num Wavelengths       |          Length               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |      Reserved   |    n  for lowest frequency    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    n2                         |          n3                   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     :                                                               :
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    nm                         |                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where Num Wavelengths tells us the number of wavelength in this
   inclusive or exclusive list this does not include the initial
   wavelength in the list hence if the number of wavelengths is odd then
   zero padding of the last half word is required.

   3.3.2. Inclusive/Exclusive Wavelength Ranges

   In the case of inclusive/exclusive ranges the wavelength set format
   is 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |2 or 3 | Num Wavelengths       |             Length            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |    Reserved     |      n  for lowest frequency  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+






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   In this case Num Wavelengths specifies the number of wavelengths in
   the range starting at the given wavelength and incrementing the Num
   Wavelengths number of channel spacing up in frequency.

   3.3.3. Bitmap Wavelength Set

   In the case of Action = 4, the bitmap the wavelength set format is
   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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  4    |   Num Wavelengths   |            Length               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |    Reserved   |      n  for lowest frequency    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    Bit Map Word #1 (Lowest frequency channels)                |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     :                                                               :
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    Bit Map Word #N (Highest frequency channels)               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where Num Wavelengths in this case tells us the number of wavelengths
   represented by the bit map. Each bit in the bit map represents a
   particular frequency with a value of 1/0 indicating whether the
   frequency is in the set or not. Bit position zero represents the
   lowest frequency, while each succeeding bit position represents the
   next frequency a channel spacing (C.S.) above the previous.

   The size of the bit map is clearly Num Wavelengths bits, but the bit
   map is made up to a full multiple of 32 bits so that the TLV is a
   multiple of four bytes. Bits that do not represent wavelengths (i.e.,
   those in positions (Num Wavelengths - 1) and beyond) SHOULD be set to
   zero and MUST be ignored.

4. Wavelength and Connectivity sub-TLV Encodings

   A type-length-value (TLV) encoding of the high level WSON information
   model [WSON-Info] is given in the following sections. This encoding
   is designed to be suitable for use in the GMPLS routing protocols
   OSPF [RFC4203] and IS-IS [RFC5307] and in the PCE protocol PCEP
   [PCEP]. Note that the information distributed in [RFC4203] and
   [RFC5307] is arranged via the nesting of sub-TLVs within TLVs and
   this document makes use of such constructs.



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4.1. Available Wavelengths Sub-TLV

   To indicate the wavelengths available for use on a link the Available
   Wavelengths sub-TLV consists of a single variable length wavelength
   set 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                           Wavelength Set Field                |
     :                                                               :
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


4.2. Shared Backup Wavelengths Sub-TLV

   To indicate the wavelengths available for shared backup use on a link
   the Shared Backup Wavelengths sub-TLV consists of a single variable
   length wavelength set 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                           Wavelength Set Field                |
     :                                                               :
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




4.3. Connectivity Matrix Sub-TLV

   The switch and fixed connectivity matrices of [WSON-Info] can be
   compactly represented in terms of a minimal list of ingress and
   egress port set pairs that have mutual connectivity. As described in
   [Switch] such a minimal list representation leads naturally to a
   graph representation for path computation purposes that involves the
   fewest additional nodes and links.

   A TLV encoding of this list of link set pairs 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  |   MatrixID    |             Reserved          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                         Link Set A #1                         |
      :                               :                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                         Link Set B #1                         :
      :                               :                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       Additional Link set pairs as needed     |
      :                     to specify connectivity                   :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where

   Connectivity is the device type.

         0 -- the device is fixed

         1 -- the device is switched(e.g., ROADM/OXC)

   MatrixID represents the ID of the connectivity matrix and is an 8 bit
   integer. The value of 0xFF is reserved for use with port wavelength
   constraints and should not be used to identify a connectivity matrix.


4.4. Port Wavelength Restriction sub-TLV

   The port wavelength restriction of [WSON-Info] can be encoded as a
   sub-TLV as follows. More than one of these sub-TLVs may be needed to
   fully specify a complex port constraint. When more than one of these
   sub-TLVs are present the resulting restriction is the intersection of
   the restrictions expressed in each sub-TLV. To indicate that a
   restriction applies to the port in general and not to a specific
   connectivity matrix use the reserved value of 0xFF for the MatrixID.











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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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   MatrixID    |  RestrictionType |      Reserved/Parameter    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Additional Restriction Parameters per RestrictionType    |
     :                                                               :
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where:

   MatrixID: either is the value in the corresponding Connectivity
   Matrix sub-TLV or takes the value OxFF to indicate the restriction
   applies to the port regardless of any Connectivity Matrix.

   RestrictionType can take the following values and meanings:

         0: SIMPLE_WAVELENGTH  (Simple wavelength selective restriction)

         1: CHANNEL_COUNT (Channel count restriction)

         2: WAVEBAND1 (Waveband device with a tunable center frequency
         and passband)

         3: SIMPLE_WAVELENGTH & CHANNEL_COUNT (Combination of
         SIMPLE_WAVELENGTH and CHANNEL_COUNT restriction. The
         accompanying wavelength set and channel count indicate
         wavelength permitted on the port and the maximum number of
         channels that can be simultaneously used on the port)

   4.4.1. SIMPLE_WAVELENGTH

   In the case of the SIMPLE_WAVELENGTH the GeneralPortRestrictions (or
   MatrixSpecificRestrictions) format is 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | MatrixID      | RstType = 0   |             Reserved          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        Wavelength Set Field                   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+






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   In this case the accompanying wavelength set indicates the
   wavelengths permitted on the port.


   4.4.2. CHANNEL_COUNT

   In the case of the CHANNEL_COUNT the format is 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | MatrixID      | RstType = 1   |        MaxNumChannels         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   In this case the accompanying MaxNumChannels indicates the maximum
   number of channels that can be simultaneously used on the
   port/matrix.


   4.4.3. WAVEBAND1

   In the case of the WAVEBAND1 the GeneralPortRestrictions (or
   MatrixSpecificRestrictions) format is 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | MatrixID      | RstType = 2   |     MaxWaveBandWidth          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        Wavelength Set                         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   In this case the accompanying MaxWaveBandWidth indicates the maximum
   width of the waveband in terms of the channels spacing given in the
   wavelength set. The corresponding wavelength set is used to indicate
   the overall tuning range. Specific center frequency tuning
   information can be obtained from dynamic channel in use information.
   It is assumed that both center frequency and bandwidth (Q) tuning can
   be done without causing faults in existing signals.


   4.4.4. SIMPLE_WAVELENGTH & CHANNEL_COUNT

   In the case of the SIMPLE_WAVELENGTH & CHANNEL_COUNT the format is
   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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | MatrixInfo    | RstType = 3   |        MaxNumChannels         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Wavelength Set Field                      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   In this case the accompanying wavelength set and MaxNumChannels
   indicate wavelength permitted on the port and the maximum number of
   channels that can be simultaneously used on the port.

5. Wavelength Converter Pool Encoding

   The encoding of structure and properties of a general wavelength
   converter pool utilizes a converter accessibility sub-TLV, a
   wavelength converter range sub-TLV, and a wavelength converter state
   sub-TLV. All these sub-TLVs make use of the wavelength converter set
   field.

5.1. Wavelength Converter Set Field

   A WSON node may include a set of wavelength converters (WC) and such
   information frequently is used in describing the wavelength converter
   pool and its properties. The WC Set field is defined in a similar
   manner to the label set concept of [RFC3471].

   The information carried in a WC 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     |     Reserved  |        Length                 |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     WC Identifier 1           |        WC Identifier 2        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      :                               :                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     WC Identifier n-1         |        WC Identifier n        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


      Action: 8 bits

         0 - Inclusive List



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

         2 - Inclusive Range

   Indicates that the TLV contains a range of WCs.  The object/TLV
   contains two WC elements. The first element indicates the start of
   the range. The second element indicates the end of the range. A value
   of zero indicates that there is no bound on the corresponding portion
   of the range.

      Reserved: 8 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.

      WC Identifier:

   The WC identifier represents the ID of the wavelength convertor which
   is a 16 bit integer.

5.2. Wavelength Converter Accessibility Sub-TLV

   This sub-TLV describes the structure of the wavelength converter pool
   in relation to the switching device. In particular it gives the
   ability of an ingress port to reach a wavelength converter and of a
   wavelength converter to reach a particular egress port. This is the
   PoolIngressMatrix and PoolEgressMatrix of [WSON-Info].

   The wavelength converter 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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    Ingress Link Set Field A #1                |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                          WC Set Field A #1                    |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         Additional Link set and WC set pairs as needed to     |
      :                    specify PoolIngressMatrix                  :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             WC Set B Field #1 (for egress connectivity)       |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Egress link Set Field B #1                     |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         Additional WC set and egress link set pairs           |
      :              as needed to specify PoolEgressMatrix            :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Note that the direction parameter within the Link Set Field is used
   to indicate whether the link set is an ingress or egress link set.



5.3. Wavelength Conversion Range Sub-TLV

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















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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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     WC Set Field                              |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Input Wavelength Set Field                     |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Output Wavelength Set Field                    |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   WC Set Field:

   A set of wavelength converters (WCs) which have the same conversion
   range.

   Input Wavelength Set Field:

   Indicates the wavelength input range of the WCs in the corresponding
   WC set.

   Output Wavelength Set Field:

   Indicates the wavelength output range of WCs in the corresponding WC
   set.

5.4. Wavelength Converter Usage State Sub-TLV

   The usage state of a wavelength converter is encoded as a bit map
   indicating whether the converter is available or in use. This
   information can be relatively dynamic, i.e., can change when a
   connection is established or torn down. This bit map is in
   correspondence with a wavelength converter set 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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     WC Set Field                              |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  WC Usage state bitmap                        |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     ......             |      Padding bits    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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

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

   Padding bits: Variable Length

6. WSON Encoding Usage Recommendations

   In this section we give recommendations of typical usage of the
   previously defined sub-TLVs. Typically the sub-TLVs defined in the
   preceding sections would be incorporated into some kind of composite
   TLV. The example composite TLVs in the following sections are based
   on the four high level information bundles of [WSON-Info].

6.1. WSON Node TLV

   The WSON Node TLV could consist of the following list of sub-TLVs:

   <Node_Info> ::= <Node_ID>[Other GMPLS sub-
   TLVs][<ConnectivityMatrix>...]
   [<WavelengthConverterPool>][<WCPoolState>]

6.2. WSON Dynamic Node TLV

   If the protocol supports the separation of dynamic information from
   relatively static information then the wavelength converter pool
   state can be separated from the general Node TLV into a dynamic Node
   TLV as follows.

   <NodeInfoDynamic> ::= <NodeID> [<WCPoolState>]




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   Note that currently the only dynamic information modeled with a node
   is associated with the status of the wavelength converter pool.

6.3. WSON Link TLV

   The new link related sub-TLVs could be incorporated into a composite
   link TLV as follows:

   <LinkInfo> ::=  <LinkID> [Other GMPLS sub-TLVs]
   <[PortWavelengthRestriction>...][<AvailableWavelengths>]
   [<SharedBackupWavelengths>]

6.4. WSON Dynamic Link TLV

   If the protocol supports the separation of dynamic information from
   relatively static information then the available wavelength and
   shared backup status can be separated from the general link TLV into
   a TLV for dynamic link information.

   <DynamicLinkInfo> ::=  <LinkID> <AvailableWavelengths>
   [<SharedBackupWavelengths>]

   Where

   <LinkID> ::= <LocalLinkID> <LocalNodeID> <RemoteLinkID>
   <RemoteNodeID>

7. 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.

8. IANA Considerations

   TBD. Once our approach is finalized we may need identifiers for the
   various TLVs and sub-TLVs.






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9. Acknowledgments

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














































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APPENDIX A: Encoding Examples

   [Editors note: these examples will be revised once the changes to the
   encodings settle down.]

A.1. Wavelength Set Field

   Example:

   A 40 channel C-Band DWDM system with 100GHz spacing with lowest
   frequency 192.0THz (1561.4nm) and highest frequency 195.9THz
   (1530.3nm). These frequencies correspond to n = -11, and n = 28
   respectively. Now suppose the following channels are available:

   Frequency (THz)    n Value      bit map position
   --------------------------------------------------
      192.0             -11               0
      192.5              -6               5
      193.1               0              11
      193.9               8              19
      194.0               9              20
      195.2              21              32
      195.8              27              38

   With the Grid value set to indicate an ITU-T G.694.1 DWDM grid, C.S.
   set to indicate 100GHz this lambda bit map set would then 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  4    | Num Wavelengths = 40  |    Length = 16 bytes          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |      Reserved   | n  for lowest frequency = -11 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |1 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |1 0 0 0 0 0 1 0|   Not used in 40 Channel system (all zeros)   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

A.2. Connectivity Matrix Sub-TLV

   Example:




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   Suppose we have a typical 2-degree 40 channel ROADM. In addition to
   its two line side ports it has 80 add and 80 drop ports. The picture
   below illustrates how a typical 2-degree ROADM system that works with
   bi-directional fiber pairs is a highly asymmetrical system composed
   of two unidirectional ROADM subsystems.



                         (Tributary) Ports #3-#42
                     Ingress added to    Egress dropped from
                     West Line Egress    East Line Ingress
                           vvvvv          ^^^^^
                          | |||.|        | |||.|
                    +-----| |||.|--------| |||.|------+
                    |    +----------------------+     |
                    |    |                      |     |
        Egress      |    | Unidirectional ROADM |     |    Ingress
   -----------------+    |                      |     +--------------
   <=====================|                      |===================<
   -----------------+    +----------------------+     +--------------
                    |                                 |
        Port #1     |                                 |   Port #2
   (West Line Side) |                                 |(East Line Side)
   -----------------+    +----------------------+     +--------------
   >=====================|                      |===================>
   -----------------+    | Unidirectional ROADM |     +--------------
        Ingress     |    |                      |     |    Egress
                    |    |              _       |     |
                    |    +----------------------+     |
                    +-----| |||.|--------| |||.|------+
                          | |||.|        | |||.|
                           vvvvv          ^^^^^
                     (Tributary) Ports #43-#82
                Egress dropped from    Ingress added to
                West Line ingress      East Line egress


   Referring to the figure we see that the ingress direction of ports
   #3-#42 (add ports) can only connect to the egress on port #1. While
   the ingress side of port #2 (line side) can only connect to the
   egress on ports #3-#42 (drop) and to the egress on port #1 (pass
   through). Similarly, the ingress direction of ports #43-#82 can only
   connect to the egress on port #2 (line). While the ingress direction
   of port #1 can only connect to the egress on ports #43-#82 (drop) or
   port #2 (pass through). We can now represent this potential




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   connectivity matrix as follows. This representation uses only 30 32-
   bit words.















































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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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    Conn = 1   |    MatrixID   |      Reserved                 |1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                          Note: adds to line
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=2     |0 1|0 0 0 0 0 0|Reserved(Note:inclusive range) |2
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #3                |3
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #42               |4
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=0     |1 0|0 0 0 0 0 0|Reserved (Note:inclusive list) |5
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #1                |6
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                       Note: line to drops
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=0     |0 1|0 0 0 0 0 0|Reserved (Note:inclusive list) |7
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #2                |8
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=2     |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|9
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #3                |10
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #42               |11
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                       Note: line to line
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=0     |0 1|0 0 0 0 0 0|Reserved (Note:inclusive list) |12
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #2                |13
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=0     |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|14
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #1                |15
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                Note: adds to line
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=2     |0 1|0 0 0 0 0 0|Reserved(Note:inclusive range) |16
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #42               |17
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



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     |                     Link Local Identifier = #82               |18
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=0     |1 0|0 0 0 0 0 0|Reserved (Note:inclusive list) |19
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #2                |20
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                       Note: line to drops
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=0     |0 1|0 0 0 0 0 0|Reserved (Note:inclusive list) |21
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #1                |22
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=2     |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|23
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #43               |24
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #82               |25
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                       Note: line to line
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=0     |0 1|0 0 0 0 0 0|Reserved (Note:inclusive list) |26
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #1                |27
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Action=0     |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|28
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #2                |30
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


A.3. Wavelength Converter Accessibility Sub-TLV

   Example:

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












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


                    +-----------+                      +------+
                    |           |--------------------->|      |
                    |           |--------------------->|  C   |
              /|    |           |--------------------->|  o   | E1
        I1   /D+--->|           |--------------------->|  m   |
            + e+--->|           |                      |  b   |========>
   ========>| M|    |  Optical  |    +-----------+     |  i   | Port #3
   Port #1  + u+--->|   Switch  |    |  WC Pool  |     |  n   |
             \x+--->|           |    |  +-----+  |     |  e   |
              \|    |           +----+->|WC #1|--+---->|  r   |
                    |           |    |  +-----+  |     +------+
                    |           |    |           |     +------+
              /|    |           |    |  +-----+  |     |      |
        I2   /D+--->|           +----+->|WC #2|--+---->|  C   | E2
            + e+--->|           |    |  +-----+  |     |  o   |
   ========>| M|    |           |    +-----------+     |  m   |========>
   Port #2  + u+--->|           |                      |  b   | Port #4
             \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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Num In Pairs=1|                   Reserved                    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                  Note: I1,I2 can connect to either WC1 or WC2
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |0 1|0 0 0 0 0 0|Reserved(Note: inclusive list) |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Link Local Identifier = #1                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Link Local Identifier = #2                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |          Reserved(Note: inclusive WC list)    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |           WC ID = #1          |       WC ID = #2              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                        Note: WC1 can only connect to E1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |       Reserved(Note: inclusive list)          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |           WC ID = #1          |       zero padding            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |1 0|0 0 0 0 0 0|Reserved(Note: inclusive list) |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Link Local Identifier = #3                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                        Note: WC2 can only connect to E2
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |       Reserved(Note: inclusive WC list)       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |           WC ID = #2          |       zero padding            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |1 0|0 0 0 0 0 0|Reserved(Note: inclusive list) |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Link Local Identifier = #4                |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


A.4. Wavelength Conversion Range Sub-TLV

   Example:

   We give an example based on figure 1 about how to represent the
   wavelength conversion range of wavelength converters. Suppose the




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   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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      Reserved                                 |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                             Note: WC Set
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Action=0     |0 1|      Reserved(Note: inclusive list)       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |           WC ID = #1          |       WC ID = #2              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                             Note: wavelength input range
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Action = 2    |   Reserved    |    Num Wavelengths = 4        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Grid |  C.S. |     Reserved    |  n for lowest frequency = 1   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                             Note: wavelength output range
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Action = 2    |   Reserved    |    Num Wavelengths = 4        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Grid |  C.S. |     Reserved    |  n for lowest frequency = 1   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+























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10. References

10.1. Normative References

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

   [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
             MIB", RFC 2863, June 2000.

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

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

   [RFC4202] Kompella, K., Ed., and Y. Rekhter, Ed., "Routing Extensions
             in Support of Generalized Multi-Protocol Label Switching
             (GMPLS)", RFC 4202, October 2005

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



10.2. 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.

   [Otani]   T. Otani, H. Guo, K. Miyazaki, D. Caviglia, "Generalized
             Labels for G.694 Lambda-Switching Capable Label Switching
             Routers", work in progress: draft-ietf-ccamp-gmpls-g-694-
             lambda-labels.

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




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   [Switch] G. Bernstein, Y. Lee, A. Gavler, J. Martensson, " Modeling
         WDM Wavelength Switching Systems for Use in GMPLS and Automated
         Path Computation", Journal of Optical Communications and
         Networking, vol. 1, June, 2009, pp. 187-195.

   [WSON-Frame] Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS
             and PCE Control of Wavelength Switched Optical Networks",
             work in progress: draft-ietf-ccamp-wavelength-switched-
             framework, Marh 2009.

   [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, March 2009.

   [PCEP]    Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation
             Element (PCE) communication Protocol (PCEP) - Version 1",
             RFC5440.





























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11. 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



Authors' Addresses

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

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







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   Young Lee (ed.)
   Huawei Technologies
   1700 Alma Drive, Suite 100
   Plano, TX 75075
   USA

   Phone: (972) 509-5599 (x2240)
   Email: ylee@huawei.com


   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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