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Versions: 00 01 02 03 draft-ietf-ccamp-rwa-info

Network Working Group                                    Greg Bernstein
Internet Draft                                        Grotto Networking
Intended status: Standards Track                              Young Lee
Expires: May 2008                                                Dan Li
                                                                 Huawei
                                                         Wataru Imajuku
                                                                    NTT


                                                      November 19, 2007

       Routing and Wavelength Assignment Information for Wavelength
                         Switched Optical Networks
                  draft-bernstein-ccamp-wson-info-01.txt


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Copyright Notice




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   Copyright (C) The IETF Trust (2007).

Abstract

   This memo provides compact encodings for information needed for path
   computation and wavelength assignment in wavelength switched optical
   networks. Such encodings can be used in extensions to Generalized
   Multi-Protocol Label Switching (GMPLS) routing for control of
   wavelength switched optical networks (WSON).



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
   2. Terminology....................................................3
   3. Generic Information............................................3
      3.1. Wavelength Information Encoding...........................3
      3.2. Link Sets.................................................4
      3.3. Wavelength Sets...........................................6
         3.3.1. Inclusive/Exclusive Wavelength Lists.................7
         3.3.2. Inclusive/Exclusive Wavelength Ranges................7
         3.3.3. Bitmap Wavelength Set................................8
   4. WSON Information for Routing and Wavelength Assignment.........9
      4.1. Connectivity Matrix......................................10
      4.2. Port Wavelength Restrictions.............................13
      4.3. WDM Link Characterization................................15
      4.4. Laser Transmitter Range..................................15
      4.5. Wavelength Converter Characterization....................15
      4.6. Wavelength Availability..................................15
   5. Security Considerations.......................................15
   6. IANA Considerations...........................................16
   7. Acknowledgments...............................................16
   8. References....................................................17
      8.1. Normative References.....................................17
      8.2. Informative References...................................17
   9. Contributors..................................................18
   Author's Addresses...............................................18
   Intellectual Property Statement..................................19
   Disclaimer of Validity...........................................19



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1. Introduction

   This document provides efficient encodings of information needed by
   the routing and wavelength assignment (RWA) process in wavelength
   switched optical networks (WSONs).  Such encodings can be applied to
   GMPLS IGP extensions to accommodate this WSON/RWA information. In
   addition these encodings could be used by other mechanisms to convey
   this same information to a path computation element (PCE). Note 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.

2. Terminology

   CWDM: Coarse Wavelength Division Multiplexing.

   DWDM: Dense Wavelength Division Multiplexing.

   FOADM: Fixed Optical Add/Drop Multiplexer.

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

   RWA: Routing and Wavelength Assignment.

   Wavelength Conversion/Converters: 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 Networks (WSON): WDM based optical
   networks in which switching is performed selectively based on the
   center wavelength of an optical signal.

3. Generic Information

   The following encodings have multiple uses in specifying WSON
   information.

3.1. Wavelength Information Encoding

   This document makes frequent use of the lambda label format defined
   in [Otani] shown 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |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.

   S = sign of the offset from the center frequency of 193.1THz for the
   ITU-T 6.694.1 grid.

   n = Used to specify the frequency as 193.1THz +/- n*(channel spacing)
   where the + or - is chosen based on the sign (S) bit.

3.2. Link Sets

   We will frequently want to describe properties 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,
   RFC4205].

   The information carried in a Link Set 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     |Dir|  Format   |         Reserved              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       Link Identifier 1                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      :                               :                               :
      :                               :                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       Link Identifier N                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


      Action: 8 bits

         0 - Inclusive List




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    Indicates that the object/TLV contains one or more link elements
   that are included in the Link Set.

         1 - Exclusive List

   Indicates that the object/TLV contains one or more link elements that
   are excluded from the Link Set.

         2 - Inclusive Range

   Indicates that the object/TLV contains a range of links.  The
   object/TLV contains two link 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.

         3 - Exclusive Range

   Indicates that the object/TLV contains a range of links that are
   excluded from the Link Set.  The object/TLV contains two link
   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.

   Dir: Directionality of the Link Set (2 bits)

   0 -- bidirectional

   1 -- ingress

   2 -- egress

   In optical networks we think in terms of unidirectional as well as
   bidirectional links.  For example wavelength restrictions or
   connectivity may be much different for an ingress port, than for its
   "companion" egress port if it has one. Note that "interfaces" such as
   discussed in the Interfaces MIB are assumed bidirectional, as well as
   the links of various link state IGPs.

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

   0 -- Link Local Identifier

   Others TBD.

   Reserved: 16 bits



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

      Link Identifier:

   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 [RFC4205] 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.



3.3. Wavelength Sets

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



   Action:

   0 - Inclusive List

   1 - Exclusive List

   2 - Inclusive Range

   3 - Exclusive Range



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   4 - Bitmap Set

   Note that the "Application" field will be used initially in the
   specification of ROADM/OXC wavelength restrictions, but may be used
   in other contexts as well.

   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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Action=0 or 1  | Reserved      |      Num Wavelengths          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Action=2 or 3  | Reserved      |      Num Wavelengths          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |S|  Reserved     |      n  for lowest frequency  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   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 (regardless of
   the value of the sign bit).




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   3.3.3. Bitmap Wavelength Set

   In the case of Action = 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | Action = 4    | Reserved    |      Num Wavelengths            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |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 which is required to be ceiling[(Num
   Wavelengths)/32]. 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.

   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






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   With the Grid value set to indicate an ITU-T G.694.1 DWDM grid, C.S.
   set to indicate 100GHz, and with S (sign) set to indicate negative
   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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | Action = 4    | Reserved      |    Num Wavelengths = 40       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Grid |  C.S. |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)   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



4. WSON Information for Routing and Wavelength Assignment

   From [WSON-Frame] the following WSON information needs to be conveyed
   via GMPLS routing or some other mechanism.

      Information                         Static/Dynamic       Node/Link
      ------------------------------------------------------------------
      Connectivity matrix                 Static               Node
      Per port wavelength restrictions    Static               Node(1)
      WDM link (fiber) lambda ranges      Static(4)            Link
      WDM link channel spacing            Static(4)            Link
      Laser Transmitter range             Static(4)            Link(2)
      Wavelength conversion capabilities  Static(3),(4)        Node
      Wavelength Availability             Dynamic(4)           Link

   Notes:

   1. These are the per port wavelength restrictions of an optical
      device such as a ROADM and are independent of any optical
      constraints imposed by a fiber link.

   2. This could also be viewed as a node capability.

   3. This could be dynamic in the case of a limited pool of converters
      where the number available can change with connection
      establishment. Note we may want to include regeneration
      capabilities here since OEO converters are also regenerators.



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   4. Not necessarily needed in the case of distributed wavelength
      assignment via signaling.

   See [WSON-Frame] for more details on these types of WSON information
   and their use.



4.1. Connectivity Matrix

   The potential connectivity matrix for asymmetric switches (e.g.
   ROADMs and such) and the connectivity matrix for asymmetric fixed
   devices can be represented by a matrix A where Amn = 0 or 1,
   depending upon whether a wavelength on ingress port m can be
   connected to egress port n.

   This can be compactly represented link sets 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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Connectivity   |               Reserved                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       Ingress Link Set #1                     |
      :                               :                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       Egress Link Set #1
      :                               :                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       Additional Link set pairs as needed     |
      :                       to specify connectivity                 :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where Connectivity = 0 if the device is fixed

                        1 if the device is reconfigurable (ROADM/OXC)

   Example:

   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.





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                         (Tributary) Ports #3-#42
                     Ingress added to    Egress dropped from
                     West Line Egress    East Line Ingress
                            vvvv           ^^^^
                          | |...|        | |...|
                    +-----| |...|--------| |...|------+
                    |    +----------------------+     |
                    |    |                      |     |
        Egress      |    | Unidirectional ROADM |     |
   -----------------+    |                      |     +--------------
   <=====================|                      |===================<
   -----------------+    +----------------------+     +--------------
                    |                                 |
        Port #1     |                                 |   Port #2
   (West Line Side) |                                 |(East Line Side)
   -----------------+    +----------------------+     +--------------
   >=====================|                      |===================>
   -----------------+    | Unidirectional ROADM |     +--------------
                    |    |                      |     |
                    |    |              _       |     |
                    |    +----------------------+     |
                    +-----| |...|--------| |...|------+
                          | |...|        | |...|
                            vvvv           ^^^^
                     (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 potentially egress on port #1. While in
   ingress side of port #2 (line side) can egress only on ports #3-#42
   (drop) and #1 (pass through). Similarly, the ingress direction of
   ports #43-#82 can only potentially egress on port #2 (line). While
   the ingress direction of port #1 can only potentially egress on ports
   #43-#82 (drop) or port #2 (pass through). We can now represent this
   potential 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   |                 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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     Link Local Identifier = #82               |18
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


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



4.2. Port Wavelength Restrictions

   An optical switching device can have the following wavelength
   restrictions:

   o  Multiple wavelengths, full range port

   o  Single wavelength, full range port

   o  Single wavelength, fixed lambda port

   o  Multiple wavelengths, reduced range port (like wave band
      switching)

   This can be encoded as a doublet of link set and wavelength set
   information:





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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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |M|  Mapping    |  Multiplier   |       Reserved                |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        Link Set                               |
     |                              ..                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        Wavelength Set                         |
     |                              ..                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Where the "M" bit indicates whether the set of ports are single
   wavelength M = 0, or multi-wavelength, M = 1, ports.

   The "Mapping" tells us how the wavelengths in the wavelength set get
   assigned to the links in the link set.

   Mapping = 0: One to Many

   Each link in the link set can take any of the values in the
   wavelength set. This is applicable to both single channel and multi-
   channel ports.

   Mapping = 1: One to One

   Links are assigned a single wavelength with respect to the order of
   links and wavelengths in their respective sets. This is applicable
   only to single channel ports (M=0).

   Mapping = 2: One to One via ranges and increments

   For single channel ports (M=0) where the wavelength is specified via
   a range then the frequency assigned to a port is given by

         Freq = freq_low + k*(Multiplier + 1)*(C.S.)

   Where k is the ordinal of the link in the link set starting from
   zero, C.S. the channel spacing, and freq_low is the lowest frequency
   in the wavelength range.  Such a formulation gives a compact way to
   represent ROADMs with colored drop ports with a regular frequency
   plan.

   Note that the link set has an indication of whether these constraints
   apply to ingress, egress or bidirectionally to the ports.





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4.3. WDM Link Characterization

   This has the same form as the port wavelength restrictions of a
   device, hence can be encoded in the same way as was done in section
   4.2.

4.4. Laser Transmitter Range

   The tuning range of a laser transmitter can be represented via the
   wavelength set mechanism of section 3.3.

4.5. Wavelength Converter Characterization

   An OEO based wavelength converter can be characterized by an input
   wavelength set and an output wavelength set.  In addition we'd want
   to know constraints on the signal formats and rates accommodated by
   the converter.

   Hence we'd have something like:

   <Wavelength Converter> := <Input Wavelength Set>, <Output Wavelength
   Set>, <Signal Types supported>, <Bit Rate Range Supported>

4.6. Wavelength Availability

   The availability of a specific wavelength on a WDM link is key
   dynamic information that is required by the RWA process. This
   information needs to be accurate; luckily it can also be represented
   quite compactly via the wavelength set encodings of section 3.3.

   For example a 120 channel system, utilizing the bit map wavelength
   set encoding would only require four bit map words in addition to the
   two general words in the encoding to fully characterize wavelength
   availability. Note that a subset of the total system range could be
   sent representing only those lambdas whose availabilities have
   changed resulting in very efficient use of control plane bandwidth.



5. Security Considerations

   This document has no requirement for a change to the security models
   within GMPLS and associated protocols. That is the OSPF-TE, RSVP-TE,
   and PCEP security models could be operated unchanged.






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6. IANA Considerations

   TBD. Once finalized in our approach we will need identifiers for such
   things and modulation types, modulation parameters, wavelength
   assignment methods, etc...

7. Acknowledgments

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









































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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.

   [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.

8.2. Informative References

   [Otani]   T. Otani, H. Guo, K. Miyazaki, D. Caviglia, "Generalized
             Labels of Lambda-Switching Capable Label Switching Routers
             (LSR)", work in progress: draft-otani-ccamp-gmpls-lambda-
             labels-00.txt, June 2007.

   [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.

   [RFC4205] Kompella, K., Ed., and Y. Rekhter, Ed., "Intermediate
             System to Intermediate System (IS-IS) Extensions in Support
             of Generalized Multi-Protocol Label Switching (GMPLS)", RFC
             4205, October 2005.

   [WSON-Frame] G. Bernstein, Y. Lee, W. Imajuku, "Framework for GMPLS
             and PCE Control of Wavelength Switched Optical Networks",
             work in progress: draft-bernstein-ccamp-wavelength-
             switched-01.txt, September 2007.




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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@(marconi.com, ericsson.com)

   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



Author's Addresses

   Greg Bernstein (ed.)
   Grotto Networking
   Fremont, CA, USA

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


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

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



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