Internet DRAFT - draft-ietf-ccamp-wson-iv-encode

draft-ietf-ccamp-wson-iv-encode







CCAMP                                                 G. Martinelli, Ed.
Internet-Draft                                                     Cisco
Intended status: Standards Track                             Y. Lee, Ed.
Expires: July 5, 2019                                Huawei Technologies
                                                           G. Galimberti
                                                                   Cisco
                                                                F. Zhang
                                                     Huawei Technologies
                                                         January 4, 2019


       Information Encoding for WSON with Impairments Validation
                   draft-ietf-ccamp-wson-iv-encode-02

Abstract

   Impairment-Aware (IA) Routing and Wavelength Assignment (RWA)
   function might be required in Wavelength Switched Optical Networks
   (WSON) that already support RWA.  This document defines proper
   encoding to support this operation.  It goes in addition to the
   available impairment-free WSON encoding and it is fully compatible
   with it.

   As the information model, the encoding is independent from control
   plane architectures and protocol implementations.  Its definitions
   can be used in related protocol extensions.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on July 5, 2019.








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Copyright Notice

   Copyright (c) 2018 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Encoding  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Optical Parameter . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Impairment Vector . . . . . . . . . . . . . . . . . . . .   5
     2.3.  Connectivity Matrix Field for Impairment  . . . . . . . .   6
     2.4.  Resource Block Information  . . . . . . . . . . . . . . .   8
   3.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   4.  Contributing Authors  . . . . . . . . . . . . . . . . . . . .   9
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   In case of WSON where optical impairments play a significant role,
   the framework document [RFC6566] defines related control plane
   architectural options for Impairment Aware Routing and Wavelength
   Assignment (IA-RWA).  This document provides a suitable encoding for
   the related WSON impairment information model as defined
   [I-D.ietf-ccamp-wson-iv-info].

   This document directly refers to ITU recommendations [ITU.G680] and
   [ITU.G697] as already detailed in the information model.







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1.1.  Requirements Language

   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].

2.  Encoding

   This section details encoding for all elements defined within
   [I-D.ietf-ccamp-wson-iv-info].  Elements to encode are:

      Optical Parameter (OPTICAL_PARAM)

      Optical Impairment Vector (OIV)

      Impairment Matrix

      Impairment Resource Block Information

2.1.  Optical Parameter

   The OPTICAL_PARAM is defined as a sub-TLV object.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |S|V|      Reserved             |  ParamSource  |    ParamID    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                            Value                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                      Variance (Optional)                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The following flag is defined:

   S: Standard bit.
         S=1 identifies a set of parameters standardized by ITU; while
         S=0 identifies a non-standardized set of parameters.

   V: Variance bit.
         V=0 only parameter value, V=1 parameter value and variance.

   With the flag S=1 the following parameters are defined:

   ParamSource = 1.
         Identify the ITU document that defines the following parameter
         list.  Currently [ITU.G697] defines this value 1 for this
         parameter.



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   ParamID.
         Parameter identifier according to the source.  [ITU.G697] table
         V.3 defines the following identifiers:

         1.  Total Power (dBm)
             Not reported within [I-D.ietf-ccamp-wson-iv-info] parameter
             list but relates to Channel Power through the number of
             channels.

         2.  Channel Power (dBm).
             Referred as parameter L-3 in [I-D.ietf-ccamp-wson-iv-info]

         3.  Reserved ("Frequency Deviation from Nominal, GHz", defined
             in [ITU.G697] but not used)

         4.  Reserved ("Wavelength Deviation from Nominal, nm", defined
             in [ITU.G697] but not used)

         5.  OSNR (db).
             Referred as parameter G-1 in [I-D.ietf-ccamp-wson-iv-info]

         6.  Reserved.  (Q Factor, a pure number).
             Not reported within [I-D.ietf-ccamp-wson-iv-info] parameter
             list but is a known index for assessing channel quality.

         7.  PMD (ps).
             Referred as parameter G-3 in [I-D.ietf-ccamp-wson-iv-info]

         8.  Residual Chromatic Dispersion (ps/nm).
             Referred as parameter G-2 in [I-D.ietf-ccamp-wson-iv-info]

   Value.
         Value for the parameter.  As defined by [ITU.G697], it is a 32
         bit IEEE floating point number.

   Variance.
         Variance for the parameter, a 32 bit IEEE floating point
         number.

   According to [I-D.ietf-ccamp-wson-iv-info], there are some parameters
   required for the IV function not listed within [ITU.G697].  Current
   information source for such parameters is [LS78] hence, this document
   proposes to use a different value for the field parameter source.

   ParamSource = 0 (proposal).
         List of parameters within [I-D.ietf-ccamp-wson-iv-info].

   ParamID.



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         A number that take the following list of values.

         1.  Ripple (dBm).  L-4 in [I-D.ietf-ccamp-wson-iv-info].

         2.  Channel signal-spontaneous noise figure.  L-5 in
             [I-D.ietf-ccamp-wson-iv-info].

         3.  DGD, Differential Group Delay.  L-8 in
             [I-D.ietf-ccamp-wson-iv-info].

         4.  Reflectance.  L-11 in [I-D.ietf-ccamp-wson-iv-info].

         5.  Isolation.  L-12 in [I-D.ietf-ccamp-wson-iv-info].

         6.  Channel extinction.  L-13 in [I-D.ietf-ccamp-wson-iv-info].

         7.  Attenuation Coefficient.  L-14 in
             [I-D.ietf-ccamp-wson-iv-info].

2.2.  Impairment Vector

   This sub-TLV is a list of optical parameters and they MAY have a
   wavelength dependency information.

    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|       Reserved              |   Number of Parameters        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Optical Param sub-TLV(s)                     |
   :                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Where:

      W = 0.  Wavelength Dependency flag.  There is no wavelength
      dependency.

      Number of Parameters contained in this vector.

      Optical Param sub-TLV(s) present a list of Object as defined in
      Section 2.1.









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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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |1|       Reserved              |   Number of Parameters        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Label Set                                    |
   :                                                               :
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Optical Param sub-TLV(s)                     |
   :                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Where:

      W = 1.  Wavelength Dependency flag.  There is wavelength
      dependency.

      The Label Set object is defined in [RFC7579] Section 2.6.  Likely
      an inclusive range will be the only option required by the Action
      defined in the Label Set.

2.3.  Connectivity Matrix Field for Impairment

   As defined by the [I-D.ietf-ccamp-wson-iv-info], the impairment
   matrix follows the same structure as the connectivity matrix.  The
   encoding of the connectivity matrix for impairment is enhanced from
   the Connectivity Matrix Field as defined in Section 2.1 of [RFC7579].
























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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  |   MatrixID    |               Reserved              |N|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                         Link Set A #1                         |
   :                               :                               :
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                         Link Set B #1                         |
   :                               :                               :
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                Impairment Vector sub-TLV(s)                   |
   :                               :                               :
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Additional Link Set pairs and Impairment Vector(s)      |
   :                               :                               :
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    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  |    MatrixID   |                Reserved             |N|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                Impairment Vector sub-TLV(s)                   |
   :                               :                               :
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Where:

      Connectivity (Conn) (4 bits) has value 2 for the impairment matrix
      (Values 0 and 1 defined by [RFC7579]).

      MatrixID: matrix identifier,following same rules as [RFC7579].

      N: Node scope flag.  With this flag set (N=0), there's no Link Set
      information but only a list of optical parameters TLVs that apply
      to the whole optical node.

   The usage of multiple matrixes with connectivity type equal to 2
   (Impairment Matrix) MIGHT be used to group optical parameters by
   connectivity.  For example, if a subset of parameters apply to the
   whole node, a unique matrix with flag N=1 is used.  At the same some
   another subset of parameters applies only to some LinkSet pairs, a
   specific Impairment Matrix will be added.






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2.4.  Resource Block Information

   The Resource Block Information field is used to represent resource
   signal constraints and processing capabilities of a node.  As defined
   by [I-D.ietf-ccamp-wson-iv-info], the concept of resource block is
   extended to support the description of the impairments related to
   that block.  The encoding expands the same structure as the one
   defined in Section 4 of [RFC7581], with the addition of an optional
   Impairment Vector sub-object:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     RB Set Field                              |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |I|O|B|                        Reserved                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Optical Interface Class List(s) (opt)          |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |               Acceptable Client Signal Type (opt)             |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    Input Bit Rate List (opt)                  |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Processing Capabilities List (opt)             |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                   OIV-Impairment Vector (opt)                 |
      :                                                               :
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The Impairment Vector is defined within Section 2.2.  All the other
   fields are defined within [RFC7581].

3.  Acknowledgements

   Authors would like to acknowledge Greg Bernstein and Moustafa Kattan
   as authors of a previous similar draft whose content partially
   converged here.

   Authors would like to thank ITU SG15/Q6 and in particular Peter
   Stassar and Pete Anslow for providing useful information and text to
   CCAMP through join meetings and liaisons.





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4.  Contributing Authors

   This document was the collective work of several authors.  The text
   and content of this document was contributed by the editors, authors
   and the co-authors listed below (the contact information for the
   editors appears in appropriate section and is not repeated below):

      Domenico Siracusa
      CREATE-NET
      via alla Cascata 56/D, Povo
      Trento  38123
      Italy

      Email: domenico.siracusa@create-net.org


      Andrea Zanardi
      CREATE-NET
      via alla Cascata 56/D, Povo
      Trento  38123
      Italy

      Email: andrea.zanardi@create-net.org


      Federico Pederzolli
      CREATE-NET
      via alla Cascata 56/D, Povo
      Trento  38123
      Italy

      Email: federico.perderzolli@create-net.org



5.  IANA Considerations

   This document does not contain any IANA request.

6.  Security Considerations

   This document defines an protocol-neutral encoding for an information
   model describing impairments in optical networks and it does not
   introduce any security issues.  If such a encoding is put into use
   within a network it will by its nature contain details of the
   physical characteristics of an optical network.  Such information
   would need to be protected from intentional or unintentional
   disclosure.



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7.  References

7.1.  Normative References

   [ITU.G680]
              International Telecommunications Union, "Physical transfer
              functions of optical network elements",
              ITU-T Recommendation G.680, July 2007.

   [ITU.G697]
              International Telecommunications Union, "Optical
              monitoring for dense wavelength division multiplexing
              systems", ITU-T Recommendation G.697, February 2012.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

7.2.  Informative References

   [I-D.ietf-ccamp-wson-iv-info]
              Martinelli, G., Zhang, X., Galimberti, G., Zanardi, A.,
              Siracusa, D., Pederzolli, F., Lee, Y., and F. Zhang,
              "Information Model for Wavelength Switched Optical
              Networks (WSONs) with Impairments Validation", draft-ietf-
              ccamp-wson-iv-info-05 (work in progress), July 2017.

   [LS78]     International Telecommunications Union SG15/Q6, "LS/s on
              CCAMP Liaison to ITU-T SG15 Q6 and Q12 on WSON",
              LS https://datatracker.ietf.org/liaison/1288/, October
              2013.

   [RFC6566]  Lee, Y., Ed., Bernstein, G., Ed., Li, D., and G.
              Martinelli, "A Framework for the Control of Wavelength
              Switched Optical Networks (WSONs) with Impairments",
              RFC 6566, DOI 10.17487/RFC6566, March 2012,
              <https://www.rfc-editor.org/info/rfc6566>.

   [RFC7579]  Bernstein, G., Ed., Lee, Y., Ed., Li, D., Imajuku, W., and
              J. Han, "General Network Element Constraint Encoding for
              GMPLS-Controlled Networks", RFC 7579,
              DOI 10.17487/RFC7579, June 2015,
              <https://www.rfc-editor.org/info/rfc7579>.







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   [RFC7581]  Bernstein, G., Ed., Lee, Y., Ed., Li, D., Imajuku, W., and
              J. Han, "Routing and Wavelength Assignment Information
              Encoding for Wavelength Switched Optical Networks",
              RFC 7581, DOI 10.17487/RFC7581, June 2015,
              <https://www.rfc-editor.org/info/rfc7581>.

Authors' Addresses

   Giovanni Martinelli (editor)
   Cisco
   via Santa Maria Molgora 48/C
   Vimercate, MB  20871
   Italy

   Phone: +39 039 2092044
   Email: giomarti@cisco.com


   Young Lee (editor)
   Huawei Technologies
   5340 Legacy Drive
   Plano, TX  75023
   U.S.A

   Email: leeyoung@huawei.com


   Gabriele M. Galimberti
   Cisco
   Via Santa Maria Molgora 48/C
   Vimercate, MB  20871
   Italy

   Phone: +39 039 2091462
   Email: ggalimbe@cisco.com


   Fatai Zhang
   Huawei Technologies
   F3-5-B R&D Center, Huawei Base
   Bantian, Longgang District
   Shenzen  518129
   P.R. China

   Email: zhang.fatai@huawei.com






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