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Versions: (draft-vergara-ccamp-flexigrid-media-channel-yang) 00

CCAMP Working Group                              J.E. Lopez de Vergara
Internet Draft                          Universidad Autonoma de Madrid
Intended status: Standards Track                       Daniel Perdices
Expires: November 27, 2018                                 Naudit HPCN
                                                              V. Lopez
                                                   O. Gonzalez de Dios
                                                   Telefonica I+D/GCTO
                                                               D. King
                                                  Lancaster University
                                                                Y. Lee
                                                                Huawei
                                                         G. Galimberti
                                                   Cisco Photonics Srl
                                                          May 24, 2018

           YANG data model for Flexi-Grid media-channels
       draft-ietf-ccamp-flexigrid-media-channel-yang-00.txt


Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on November 27, 2018

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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document. Please review these documents


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   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.

Abstract

   This document defines a YANG model for managing flexi-grid optical
   media channels, complementing the information provided by the
   flexi-grid TED model.
   It is also grounded on other defined YANG abstract models.

Table of Contents

   1.  Introduction ..............................................  2
   2.  Conventions used in this document .........................  3
   3.  Flexi-grid media-channel overview .........................  3
   4.  Example of use ............................................  4
   5.  Media Channel YANG Model ..................................  5
       5.1. YANG Model - Tree ....................................  5
       5.2. YANG Model - Code ....................................  6
       5.3. License .............................................. 10
   6.  Security Considerations ................................... 10
   7.  IANA Considerations ....................................... 10
   8.  References ................................................ 11
       8.1. Normative References ................................. 11
       8.2. Informative References ............................... 11
   9.  Contributors .............................................. 11
   10. Acknowledgments ........................................... 11
   Authors' Addresses ............................................ 12


1. Introduction

   Transport networks are evolving from current DWDM systems towards
   elastic optical networks, based on flexi-grid transmission and
   switching technologies [RFC7698]. Such technology aims at increasing
   both transport network scalability and flexibility, allowing the
   optimization of bandwidth usage.


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   While [I-D.draft-ietf-ccamp-flexigrid-yang] focuses on flexi-grid
   objects such as nodes, transponders and links, this document presents
   a YANG model for the flexi-grid media-channel. This YANG module
   defines the whole path from a source transponder or node to the
   destination through a number of intermediate nodes in the flexi-grid
   network.

   This document identifies the flexi-grid media-channel components,
   parameters and their values, characterizes the features and the
   performances of the flexi-grid elements. An application example is
   provided towards the end of the document to better understand
   their utility.

2. 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 [RFC2119].

   In this document, these words will appear with that interpretation
   only when in ALL CAPS. Lower case uses of these words are not to be
   interpreted as carrying RFC-2119 significance.

   In this document, the characters ">>" preceding an indented line(s)
   indicates a compliance requirement statement using the key words
   listed above. This convention aids reviewers in quickly identifying
   or finding the explicit compliance requirements of this RFC.


3. Flexi-grid media-channel overview

   The present model defines a flexi-grid media-channel mainly
   composed of:
      - source address
      - source flexi-grid port
      - source flexi-grid transponder
      - destination address
      - destination flexi-grid port
      - destination flexi-grid transponder
      - A list of links that defines the path
      - Other optical attributes

    Each path can be a media-channel (only defined by source and
    destination node) or a network media-channel (additionally needs
    source and destination transponders). Therefore, all the attributes
    are optional to support both situations.


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    This is achieved by a combination of the traffic engineering tunnel
    attributes explained in [I-D.draft-ietf-teas-yang-te] and augments
    when necessary. For instance, source address, source flexi-grid
    transponder, destination address and destination flexi-grid
    transponder attributes are directly taken from tunnel, whereas other
    attributes such as source flexi-grid port, destination flexi-grid
    port are defined, as they are specific for flexi-grid.



4. Example of use

   In order to explain how this model is used, we provide the following
   example. An optical network usually has multiple transponders,
   switches (nodes) and links between them. Figure 1 shows a simple
   topology, where two physical paths interconnect two optical
   transponders.
                               Media channel
            <==================================================>
                                  Path x
            <-------------------------------------------------->

                     +----------+          +----------+
              Link 1 |Flexi-grid|  Link 2  |Flexi-grid| Link 3
                .--->|   node   |<-------->|   node   |<---.
                |    |    B     |          |    C     |    |
                |    +----------+          +----------+    |
                v                                          v
             /-----------\                       /-----------\
            / Flexi-grid  \                     / Flexi-grid  \
            | transponder |                     | transponder |
            \      A      /                     \      E      /
             \-----------/                       \-----------/
                  ^                                     ^
                  |             +----------+            |
                  |    Link 4   |Flexi-grid|   Link 5   |
                  '------------>|   node   |<-----------'
                                |    D     |
                                +----------+
            <-------------------------------------------------->
                                  Path y

                      Figure 1. Topology example.


   After the nodes, links and transponders have been defined using
   [I-D.draft-ietf-ccamp-flexigrid-yang], we can configure the
   media-channel from the information we have stored in the
   flexi-grid TED, by querying which elements are available, and
   planning the resources that have to be provided on each situation.
   Note that every element in the flexi-grid TED has a reference, and
   this is the way in which they are called in the media-channel.


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   1. Depending on the case, it is possible to define either the source
      and destination node ports, or the source and destination node
      and transponder. In our case, we would define a network media
      channel, with source transponder A and source node B, and
      destination transponder E and destination node C. Thus, we are
      going to follow path x.

   2. Then, for each link in the path x, we indicate which channel we
      are going to use, providing information about the slots, and what
      nodes are connected.

   3. Finally, the flexi-grid TED has to be updated with each element
      usage status each time a media channel is created or torn down.

5. Media Channel YANG Model

5.1. YANG Model - Tree

module: ietf-flexi-grid-media-channel
  augment /te:te/te:tunnels/te:tunnel:
    +--rw source-port?           fg-ted:flexi-grid-node-port-ref
    +--rw destination-port?      fg-ted:flexi-grid-node-port-ref
    +--rw effective-freq-slot
       +--rw N?   int32
       +--rw M?   int32
  augment /te:te/te:tunnels/te:tunnel/te:state:
    +--ro source-port?           fg-ted:flexi-grid-node-port-ref
    +--ro destination-port?      fg-ted:flexi-grid-node-port-ref
    +--ro effective-freq-slot
       +--ro N?   int32
       +--ro M?   int32
  augment /te:te/te:lsps-state/te:lsp:
    +--ro N?                  int32
    +--ro M?                  int32
    +--ro source-port?        fg-ted:flexi-grid-node-port-ref
    +--ro destination-port?   fg-ted:flexi-grid-node-port-ref
    +--ro link?               fg-ted:flexi-grid-link-ref
    +--ro bidirectional?      boolean


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5.2. YANG Model - Code

<CODE BEGINS> file "ietf-flexi-grid-media-channel@2018-05-24.yang"

module ietf-flexi-grid-media-channel {
   yang-version 1.1;

   namespace
     "urn:ietf:params:xml:ns:yang:ietf-flexi-grid-media-channel";
   prefix "fg-mc";

   import ietf-flexi-grid-ted {
      prefix "fg-ted";
   }

   import ietf-te {
      prefix "te";
   }

   import ietf-network {
      prefix "nd";
   }
   organization
      "IETF CCAMP Working Group";
   contact
      "Editor: Jorge Lopez de Vergara
                 <jorge.lopez_vergara@uam.es>";

   description
      "This module contains a collection of YANG definitions for
      a Flexi-Grid media channel.

      Copyright (c) 2018 IETF Trust and the persons identified as
      authors of the code.  All rights reserved.

      Redistribution and use in source and binary forms, with or
      without modification, is permitted pursuant to, and subject
      to the license terms contained in, the Simplified BSD
      License set forth in Section 4.c of the IETF Trust's Legal
      Provisions Relating to IETF Documents
      (http://trustee.ietf.org/license-info).";

   revision 2018-05-24 {
      description
         "version 0.1";

      reference
         "RFC XXX: A Yang Data Model for Flexi-Grid media-channels";
   }


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   grouping flexi-grid-media-channel {
         description
            "Media association that represents both the topology
            (i.e., path through the media) and the resource
            (frequency slot) that it occupies.  As a topological
            construct, it represents a (effective) frequency slot
            supported by a concatenation of media elements (fibers,
            amplifiers, filters, switching matrices...).  This term
            is used to identify the end-to-end physical layer entity
            with its corresponding (one or more) frequency slots
            local at each link filters.";
         reference "rfc7698";
         leaf source-port {
            type fg-ted:flexi-grid-node-port-ref;
            description "Source port";
          }
         leaf destination-port {
            type fg-ted:flexi-grid-node-port-ref;
            description "Destination port";
          }
         container effective-freq-slot {
         description "The effective frequency slot is an attribute
            of a media channel and, being a frequency slot, it is
            described by its nominal central frequency and slot
            width";
         reference "rfc7698";
            leaf N {
               type int32;
               description
                  "Is used to determine the Nominal Central
                  Frequency. The set of nominal central frequencies
                  can be built using the following expression:
                     f = 193.1 THz + n x 0.00625 THz,
                  where 193.1 THz is ITU-T ''anchor frequency'' for
                  transmission over the C band, n is a positive or
                  negative integer including 0.";
               reference "rfc7698";
            }
            leaf M {
               type int32;
               description
                  "Is used to determine the slot width. A slot width
                  is constrained to be M x SWG (that is, M x 12.5 GHz),
                  where M is an integer greater than or equal to 1.";
               reference "rfc7698";
         }
      }
   }



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   grouping link-channel-attributes {
      description
         "A link channel is one of the concatenated elements of
         the media channel.";
      leaf N {
         type int32;
         description
            "Is used to determine the Nominal Central Frequency.
            The set of nominal central frequencies can be built
            using the following expression:
               f = 193.1 THz + n x 0.00625 THz,
            where 193.1 THz is ITU-T ''anchor frequency'' for
            transmission over the C band, n is a positive or
            negative integer including 0.";
         reference "rfc7698";
      }
      leaf M {
         type int32;
            description
               "Is used to determine the slot width. A slot
               width is constrained to be M x SWG (that is,
               M x 12.5 GHz), where M is an integer greater than
               or equal to 1.";
            reference "rfc7698";
      }
      leaf source-port {
         type fg-ted:flexi-grid-node-port-ref;
         description "Source port of the link channel";
      }
      leaf destination-port {
         type fg-ted:flexi-grid-node-port-ref;
         description "Destination port of the link channel";
      }
      leaf link {
         type fg-ted:flexi-grid-link-ref;
         description "Link of the link channel";
      }
      leaf bidirectional {
         type boolean;
         description
            "Determines whether the link is bidirectional or
            not";
      }
   }


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   /* Augment for media-channel */
   augment "/te:te/te:tunnels/te:tunnel" {
       when "/nd:networks/nd:network/nd:network-types/
     fg-ted:flexi-grid-network"{
          description "Augment only for Flexigrid network.";
       }
       description "Augment tunnel with media-channel config";
       uses flexi-grid-media-channel;

   }

      augment "/te:te/te:tunnels/te:tunnel/te:state" {
       when "/nd:networks/nd:network/nd:network-types/
     fg-ted:flexi-grid-network"{
          description "Augment only for Flexigrid network.";
       }
       uses flexi-grid-media-channel;
       description "Augment tunnel with media-channel state";

   }

   /* Augment for LSP */
   augment "/te:te/te:lsps-state/te:lsp" {
      when "/nd:networks/nd:network/nd:network-types/
     fg-ted:flexi-grid-network"{
          description "Augment only for Flexigrid network.";
      }
      uses link-channel-attributes;
      description "Augment LSP for paths";
   }

}

<CODE ENDS>


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5.3. License

   Copyright (c) 2018 IETF Trust and the persons identified as authors
   of the code. All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   o Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.

   o Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the
      distribution.

   o Neither the name of Internet Society, IETF or IETF Trust, nor the
      names of specific contributors, may be used to endorse or promote
      products derived from this software without specific prior
      written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGE.


6. Security Considerations

   The transport protocol used for sending the managed information MUST
   support authentication and SHOULD support encryption.

   The defined data-model by itself does not create any security
   implications.

7. IANA Considerations

   The namespace used in the defined models is currently based on the
   METRO-HAUL project URI. Future versions of this document could
   register a URI in the IETF XML registry [RFC3688], as well as in the
   YANG Module Names registry [RFC6020].


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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.

   [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
             the Network Configuration Protocol (NETCONF)", RFC 6020,
             October 2010.

   [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
             January 2004.


8.2. Informative References

   [RFC7698] Gonzalez de Dios, O., Casellas, R., Eds. "Framework and
             Requirements for GMPLS-Based Control of Flexi-Grid Dense
             Wavelength Division Multiplexing (DWDM) Networks",
             RFC7698, November 2015.
   [I-D.draft-ietf-ccamp-flexigrid-yang] Lopez de Vergara, J.,
          Perdices, D., Lopez, V., Gonzalez de Dios, O.,  King, D.,
          Lee, Y., Galimberti, G., "YANG data model for Flexi-Grid
          Optical Networks", Internet Draft,
          draft-ietf-ccamp-flexigrid-yang-00, 2018.
   [I-D.draft-ietf-teas-yang-te]
          Saad, T., Gandhi, R., Liu, X., Beeram, V., Shah, H.,
          Bryskin, I., Chen, X., Jones, R., and B. Wen, "A YANG Data
          Model for Traffic Engineering Tunnels and Interfaces",
          draft-ietf-teas-yang-te-14, 2018.



9. Contributors

   The model presented in this paper was contributed to by more people
   than can be listed on the author list.  Additional contributors
   include:

   o Zafar Ali, Cisco Systems
   o Daniel Michaud Vallinoto, Universidad Autonoma de Madrid


10. Acknowledgments

   The work presented in this Internet-Draft has been partially funded
   by the European Commission under the project H2020 METRO-HAUL
   (Metro High bandwidth, 5G Application-aware optical network, with
   edge storage, compUte and low Latency), Grant Agreement number:
   761727, and by the Spanish Ministry of Economy and Competitiveness
   under the project TRAFICA, MINECO/FEDER TEC2015-69417-C2-1-R.


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Authors' Addresses

   Jorge E. Lopez de Vergara
   Universidad Autonoma de Madrid
   Escuela Politecnica Superior
   C/Francisco Tomas y Valiente, 11
   E-28049 Madrid, Spain

   Email: jorge.lopez_vergara@uam.es

   Daniel Perdices Burrero
   Naudit High Performance Computing and Networking, S.L.
   C/Faraday, 7
   E-28049 Madrid, Spain

   Email: daniel.perdices@naudit.es


   Victor Lopez
   Telefonica I+D/GCTO
   Distrito Telefonica
   E-28050 Madrid, Spain

   Email: victor.lopezalvarez@telefonica.com

   Oscar Gonzalez de Dios
   Telefonica I+D/GCTO
   Distrito Telefonica
   E-28050 Madrid, Spain

   Email: oscar.gonzalezdedios@telefonica.com


   Daniel King
   Lancaster University

   Email: d.king@lancaster.ac.uk


   Young Lee
   Huawei Technologies

   Email: leeyoung@huawei.com


   Gabriele Galimberti
   Cisco Photonics Srl

   Email: ggalimbe@cisco.com

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