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Versions: 00 01 02 03 04 05 06 07 08 09 10                              
Internet Engineering Task Force                       G. Galimberti, Ed.
Internet-Draft                                               D. La Fauci
Intended status: Informational                                     Cisco
Expires: December 31, 2017                               A. Zanardi, Ed.
                                                             L. Galvagni
                                                           FBK-CreateNet
                                                           June 29, 2017


  Signaling extensions for Media Channel sub-carriers configuration in
Spectrum Switched Optical Networks (SSON) in Lambda Switch Capable (LSC)
                         Optical Line Systems.
            draft-ggalimbe-ccamp-flexigrid-carrier-label-01

Abstract

   This memo defines the signaling extensions for managing Spectrum
   Switched Optical Network (SSON) parameters shared between the Client
   and the Network and inside the Network in accordance to the model
   described in RFC 7698.  The extensions are in accordance and
   extending the parameters defined in ITU-T Recommendation
   G.694.1.[ITU.G694.1] and its extensions and G.872.[ITU.G872].

Copyright Notice

   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

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

   This Internet-Draft will expire on December 31, 2017.







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Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Client interface parameters . . . . . . . . . . . . . . . . .   3
   3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Signalling Extensions . . . . . . . . . . . . . . . . . . . .   5
     4.1.  New LSP set-up parameters . . . . . . . . . . . . . . . .   5
     4.2.  Extension to LSP set-up reservation . . . . . . . . . . .   6
     4.3.  RSVP Protocol Extensions considerations . . . . . . . . .   9
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   Generalised Multiprotocol Label Switched (GMPLS) is widely used in
   Wavelength Switched Optical Network (WSON) to support the optical
   circuits set-up through the signalling between Core Nodes and Edge
   Nodes.  This extension addresses the use cases described by [RFC7698]
   Ch.3.3 and supports the information, needed in Spectrum Switched
   Optical Network (SSON), to signal a Media Channel and the associated
   carriers set request.  The new set of parameters is related to the
   Media Channel and the carrier(s) routed with it and keep the backward
   compatibility with the WSON signalling.  In particular this memo
   wants do address the use cases where the SSON LSP (the Media Channel
   in RFC7698) carries multiple carrier (OTSi) containing same Payload.
   The set of the carriers can be seen as single Logical circuit.  This
   memo can be considered as the extension of [RFC7792].  The contents




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   and the parameters reflect the experimental activity on IP over SSON
   recently done by some vendors and research consortia.

   Figure 1 shows how the multiple carrier are mapped into a Media
   Channel.  A set of parameters must be shared on the UNI to allow the
   GMPLS to do the proper routing and Spectrum Assignment and decide the
   carrier position.


      +------+       +------+  _________  +------+       +------+
      | E.N. |       | C.N. | /        /\ | C.N. |       | E.N. |
      |  OTS1| ----- |      ||        |  ||      | ----- |OTS1  |
    ==|  OTS2| ----- |      || Media  |  ||      | ----- |OTS2  |==
    ==|  OTS3| ----- |      || Channel|  ||      | ----- |OTS3  |==
      |  OTS4| ----- |      ||        |  ||      | ----- |OTS4  |
      |      |       | ROADM| \________\/ | ROADM|       |      |
      +------+       +------+             +------+       +------+
            ^         ^                         ^         ^
            |         |                         |         |
            +---UNI---+                         +---UNI---+


   E.N. = Edge Node - UNI Client
   C.N. = Core Node - UNI Network
   ROADM = Lambda/Spectrum switch
   Media Channel = the optical circuit
   OTSi = Carriers belonging to the same Network Media Channel (or
          Super Channel)
   UNI = Signallig interface


   from Fig. 5.1/G.698.2

                        Figure 1: Multi carrier LSP

2.  Client interface parameters

   The Edge Node interface can have one or multiple carriers (OTSi).
   All the carrier have the same characteristics and are provisionable
   in terms of:

   Number of subcarriers:
      This parameter indicates the number of subcarriers available for
      the super-channel in case the Transceiver can support multiple
      carrier circuits.

   Central frequency (see G.694.1 Table 1):




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      This parameter indicates the Central frequency value that Ss and
      Rs will be set to work (in THz).  See the details in Section 6/
      G.694.1 or based on "n" value explanation and the following "k"
      values definition in case of multicarrier transceivers.

   Central frequency granularity:
      This parameter indicates the Central frequency granularity
      supported by the transceiver, this value is combined with k and n
      value to calculate the central frequency of the carrier or sub-
      carriers.

   Minimum channel spacing:
      This is the minimum nominal difference in frequency (in GHz)
      between two adjacent channels (or carriers) depending on the
      Transceiver characteristics.

   Bit rate / Baud rate of optical tributary signals:
      Optical Tributary Signal bit (for NRZ signals) rate or Symbol (for
      Multiple bit per symbol) rate .

   FEC Coding:
      This parameter indicate what Forward Error Correction (FEC) code
      is used at Ss and Rs (R/W) (not mentioned in G.698.2).  .

   Wavelength Range (see G.694.1):  [ITU.G694.1]
      This parameter indicate minimum and maximum wavelength spectrum in
      a definite wavelength Band (L, C and S).

   Modulation format:
      This parameter indicates the list of supported Modulation Formats
      and the provisioned Modulation Format..

   Inter carrier skew:
      This parameter indicates, in case of multi-carrier transceivers
      the maximum skew between the sub-carriers supported by the
      transceiver.

   Laser Output power:
      This parameter provisions the Transceiver Output power, it can be
      either a setting and measured value.

   receiver input power:
      This parameter provisions the Min and MAX input pover suppotred by
      the Transceiver, i.e. Receiver Sensitivity.

   The above parameters are related to the Edge Node Transceiver and are
   used by the Core Network GMPLS in order to calculate the optical
   feasibility and the spectrum allocation.  The parameters can be



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   shared between the Client and the Network via LMP or provisioned in
   the Network by an EMS or an operator OSS.

3.  Use Cases

   The use cases are described in draft-ietf-ccamp-dwdm-if-mng-ctrl-fwk
   and [RFC7698]

4.  Signalling Extensions

   Some of the above parameters can be applied to RFC7699 (SENDER_TSPEC/
   FLOWSPEC).  The above parameters could be applied to [RFC4208]
   scenarios but they are valid also in case of non UNI scenarios.  The
   [RFC6205] parameters remain valid.

4.1.  New LSP set-up parameters

   When the E.N. wants to request to the C.N. a new circuit set-up
   request or the GMPLS want to signal in the SSON network the Optical
   Interface characteristics the following parameters will be provided
   to the C.N.:

   Number of available subcarriers (c):
      This parameter is an integer.

   Total bandwidth request:
      e.g. 200Gb, 400Gb, 1Tb

   Policy (strict/loose):
      Strict/loose referred to B/W and subcarrier number.

   Subcarrier bandwidth tunability:
      (optional) e.g. 34Ghz, 48GHz.


















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   Figure 2: The format of the this sub-object (Type = TBA, Length =
   TBA) is as follows:

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |S|B|     Number of Carriers    |        Client bandwidth       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |             Subcarrier frequency tunability (optional)        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Sub-Transponder Mod Format: In the Value Field (96 bits) it is
   specified
   S strict number of subcarrier (No = 0, Yes = 1)
   B strict client bandwidth (No = 0, Yes = 1)
   - Num Carriers
   - Client bandwidth (100Gb, 150Gb, 200Gb, 400Gb, 1Tb, etc)
   - Subcarrier frequency tunability (optional)


                     Figure 2: SSON LSP set-up request

4.2.  Extension to LSP set-up reservation

   Once the GMPLS has calculated the Media Channel path, the Spectrum
   Allocation, the Sub-carrier number and frequency, the modulation
   format, the FEC and the Transmit power, sends back to the E.N. the
   path set-up confirmation providing the values of the calculated
   paramenters:

   Media Channel:
      (Grid, C.S., Identifier m and n).

   List of subcarriers:
      This parameter indicates the subcarriers to be used for the super-
      channel in case the Transceiver can support multiple carrier
      Circuits.

   Central frequency (see G.694.1 Table 1):
      Grid, Identifiers, central frequency and granularity.

   Central frequency granularity:
      This parameter indicates the Central frequency granularity
      supported by the transceiver, this value is combined with K and n
      value to calculate the central frequency on the carrier or sub-
      carriers.

   Bit rate / Baud rate of optical tributary signals:



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      Optical tributary signal bit (for NRZ signals) rate or Symbol (for
      Multiple bit per symbol) rate.

   FEC Coding:
      This parameter indicate what Forward Error Correction (FEC) code
      must be used by the Transceivers (not mentioned in G.698).  .

   Modulation format:
      This parameter indicates the Modulation Formats to be set in the
      Transceivers.

   Laser Output power:
      This parameter provisions the Transceiver Output power, it can be
      either a setting and measured value.

   Circuit Path, RRO, etc:
      All these info are defined in [RFC4208].

   Path Error:
      e.g. no path exist, all the path error defined in [RFC4208].

   Figure 3: The format of this sub-object (Type = TBA, Length = TBA) is
   as follows:

     0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |S|I|         Modulation ID     |               FEC             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                         baud rate  (Symbol Rate)              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Traffic Type
       - R: standardized format
       - I: input / output (1 / 0)
       - Modulation IDs: BPSK, DC DP BSPSK, QPSK, DP QPSK, 8QAM,
                         16QAM, 16QAM, 64QAM, Hybrid, etc.
       - FEC
       - Baud Rate: IEEE float in bauds/s












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   For Each carrier inside the Media Channel the TLV is used:

    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| carrier Identifier      |               j               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                               k                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                        sub-carrier power                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Carrie set-up:

     - Media channel Grid
            +----------+---------+
            |   Grid   |  Value  |
            +----------+---------+
            |ITU-T Flex|    3    |
            +----------+---------+

     - Sub carrier identifier field: sub-carrier
              identifier inside the mediachannel
     - J field:  granularity of the channel spacing, can be a
              multiple of 0.01GHz. - default value is 0.1GHz.
     - K field:  positive or negative integer (including 0) to multiply
              by J and identify the S.C. Position inside the
              Media Channel, J can be set at default value = 0.1GHz.
     - sub-carrier power: subcarrier output power to be set (optional ?)

     In summary S.C. Frequency = MC-C.F. (in THz) + K * J GHz


                                    m=8
     +-------------------------------X------------------------------+
     |                               |                              |
     |           sub-carrier                    sub-carrier         |
     |     +----------X----------+   |   +----------X----------+    |
     |     |        OTSi         |       |         OTSi        |    |
     |     |          o          |   |   |          o          |    |
     |     |          |          |       |          |          |    |
    -4  -3  -2  -1   0   1   2   3   4   5   6   7   8   9   10  11  12
   --+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+-
                      |             n=4             |
                      K1    -236     |     +236     k2

     <------------------------ Media Channel ----------------------->




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                           Figure 3: OCh_General

4.3.  RSVP Protocol Extensions considerations

   The additional information described in the draft, is related to the
   Media Channel supported traffic.  It could be encoded as specific
   extensions of the SENDER_TSPEC/FLOW_SPEC object for Flexi-Grid
   networks (see [RFC7792])

5.  Security Considerations

   GMPLS message security uses IPsec, as described in xxxx.  This
   document only defines new UNI objects that are carried in existing
   UNI messages, similar to the UNI objects in xxx.  This document does
   not introduce new security considerations.

6.  IANA Considerations

   T.B.D.


7.  Contributors

        Antonello Bonfanti
           Cisco
           Via Santa Maria Molgora, 48 c
           20871 - Vimercate (MB)
           Italy
           abonfant@cisco.com</email>

8.  References

8.1.  Normative References

   [ITU.G694.1]
              International Telecommunications Union, ""Spectral grids
              for WDM applications: DWDM frequency grid"",
              ITU-T Recommendation G.698.2, February 2012.

   [ITU.G698.2]
              International Telecommunications Union, "Amplified
              multichannel dense wavelength division multiplexing
              applications with single channel optical interfaces",
              ITU-T Recommendation G.698.2, November 2009.







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   [ITU.G709]
              International Telecommunications Union, "Interface for the
              Optical Transport Network (OTN)", ITU-T Recommendation
              G.709, February 2012.

   [ITU.G872]
              International Telecommunications Union, "Architecture of
              optical transport networks", ITU-T Recommendation G.872,
              October 2012.

   [ITU.G874.1]
              International Telecommunications Union, "Optical transport
              network (OTN): Protocol-neutral management information
              model for the network element view", ITU-T Recommendation
              G.874.1, October 2012.

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

   [RFC3473]  Berger, L., Ed., "Generalized Multi-Protocol Label
              Switching (GMPLS) Signaling Resource ReserVation Protocol-
              Traffic Engineering (RSVP-TE) Extensions", RFC 3473,
              DOI 10.17487/RFC3473, January 2003,
              <http://www.rfc-editor.org/info/rfc3473>.

   [RFC3945]  Mannie, E., Ed., "Generalized Multi-Protocol Label
              Switching (GMPLS) Architecture", RFC 3945,
              DOI 10.17487/RFC3945, October 2004,
              <http://www.rfc-editor.org/info/rfc3945>.

   [RFC4208]  Swallow, G., Drake, J., Ishimatsu, H., and Y. Rekhter,
              "Generalized Multiprotocol Label Switching (GMPLS) User-
              Network Interface (UNI): Resource ReserVation Protocol-
              Traffic Engineering (RSVP-TE) Support for the Overlay
              Model", RFC 4208, DOI 10.17487/RFC4208, October 2005,
              <http://www.rfc-editor.org/info/rfc4208>.

   [RFC5920]  Fang, L., Ed., "Security Framework for MPLS and GMPLS
              Networks", RFC 5920, DOI 10.17487/RFC5920, July 2010,
              <http://www.rfc-editor.org/info/rfc5920>.

   [RFC6163]  Lee, Y., Ed., Bernstein, G., Ed., and W. Imajuku,
              "Framework for GMPLS and Path Computation Element (PCE)
              Control of Wavelength Switched Optical Networks (WSONs)",
              RFC 6163, DOI 10.17487/RFC6163, April 2011,
              <http://www.rfc-editor.org/info/rfc6163>.



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   [RFC6205]  Otani, T., Ed. and D. Li, Ed., "Generalized Labels for
              Lambda-Switch-Capable (LSC) Label Switching Routers",
              RFC 6205, DOI 10.17487/RFC6205, March 2011,
              <http://www.rfc-editor.org/info/rfc6205>.

   [RFC7698]  Gonzalez de Dios, O., Ed., Casellas, R., Ed., Zhang, F.,
              Fu, X., Ceccarelli, D., and I. Hussain, "Framework and
              Requirements for GMPLS-Based Control of Flexi-Grid Dense
              Wavelength Division Multiplexing (DWDM) Networks",
              RFC 7698, DOI 10.17487/RFC7698, November 2015,
              <http://www.rfc-editor.org/info/rfc7698>.

   [RFC7699]  Farrel, A., King, D., Li, Y., and F. Zhang, "Generalized
              Labels for the Flexi-Grid in Lambda Switch Capable (LSC)
              Label Switching Routers", RFC 7699, DOI 10.17487/RFC7699,
              November 2015, <http://www.rfc-editor.org/info/rfc7699>.

   [RFC7792]  Zhang, F., Zhang, X., Farrel, A., Gonzalez de Dios, O.,
              and D. Ceccarelli, "RSVP-TE Signaling Extensions in
              Support of Flexi-Grid Dense Wavelength Division
              Multiplexing (DWDM) Networks", RFC 7792,
              DOI 10.17487/RFC7792, March 2016,
              <http://www.rfc-editor.org/info/rfc7792>.

8.2.  Informative References

   [RFC2629]  Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629,
              DOI 10.17487/RFC2629, June 1999,
              <http://www.rfc-editor.org/info/rfc2629>.

   [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
              "Introduction and Applicability Statements for Internet-
              Standard Management Framework", RFC 3410,
              DOI 10.17487/RFC3410, December 2002,
              <http://www.rfc-editor.org/info/rfc3410>.

   [RFC4181]  Heard, C., Ed., "Guidelines for Authors and Reviewers of
              MIB Documents", BCP 111, RFC 4181, DOI 10.17487/RFC4181,
              September 2005, <http://www.rfc-editor.org/info/rfc4181>.

Authors' Addresses










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   Gabriele Galimberti (editor)
   Cisco
   Via S. Maria Molgora, 48 c
   20871 - Vimercate
   Italy

   Phone: +390392091462
   Email: ggalimbe@cisco.com


   Domenico La Fauci
   Cisco
   Via S. Maria Molgora, 48 c
   20871 - Vimercate
   Italy

   Phone: +390392091946
   Email: dlafauci@cisco.com


   Andrea Zanardi (editor)
   FBK-CreateNet
   via alla Cascata 56/D
   38123 Povo, Trento
   Italy

   Phone: +390461312450
   Email: azanardi@fbk.eu


   Lorenzo Galvagni
   FBK-CreateNet
   via alla Cascata 56/D
   38123 Povo, Trento
   Italy

   Phone: +390461312427
   Email: lgalvagni@fbk.eu













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