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Versions: (draft-vergara-flexigrid-yang) 00 01 02 03 04 05

CCAMP Working Group                              J.E. Lopez de Vergara
Internet Draft                          Universidad Autonoma de Madrid
Intended status: Standards Track                       Daniel Perdices
Expires: January 3, 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
                                                          July 3, 2017

              YANG data model for Flexi-Grid Optical Networks
                 draft-vergara-ccamp-flexigrid-yang-05.txt


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   This Internet-Draft will expire on January 3, 2018.

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


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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
   Networks. The model described in this document defines a flexi-grid
   traffic engineering database. A complementary module is referenced
   to detail the flexi-grid media channels.

   This module is grounded on other defined YANG abstract models.

Table of Contents

   1. Introduction ..............................................  2
   2. Conventions used in this document .........................  3
   3. Flexi-grid network topology model overview ................  3
   4. Main building blocks of the Flexi-grid TED.................  4
      4.1 Formal Syntax .........................................  7
   5. Example of use ............................................  8
   6. Flexi-grid TED YANG Model..................................  9
      6.1. YANG Model - Tree ....................................  9
      6.2. YANG Model - Code .................................... 10
      6.3. License .............................................. 19
   7. Security Considerations ................................... 20
   8. IANA Considerations ....................................... 20
   9. References ................................................ 20
      9.1. Normative References ................................. 20
      9.2. Informative References ............................... 21
   10. Contributors ............................................. 21
   11. Acknowledgments .......................................... 22
   Authors' Addresses ........................................... 22


1. Introduction

   Internet-based traffic is dramatically increasing every year.
   Moreover, such traffic is also becoming more dynamic. Thus,
   transport networks need to evolve from current DWDM systems towards
   elastic optical networks, based on flexi-grid transmission and
   switching technologies [RFC7698]. This technology aims at increasing
   both transport network scalability and flexibility, allowing the
   optimization of bandwidth usage.


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   This document presents a YANG model for flexi-grid objects in the
   dynamic optical network, including the nodes, transponders and links
   between them, as well as how such links interconnect nodes and
   transponders.

   The YANG model for flexi-grid networks allows the representation of
   the flexi-grid optical layer of a network, combined with the
   underlying physical layer.

   This document identifies the flexi-grid 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 network topology model overview

   YANG is a data modeling language used to model configuration data
   manipulated by the NETCONF protocol. Several YANG models have already
   been specified for network configurations. For instance, the work in
   [I-D.draft-ietf-i2rs-yang-network-topo] has proposed a generic YANG
   model for network/service topologies and inventories. The work in
   [I-D.draft-ietf-teas-yang-te-topo] presents a data model to
   represent, retrieve and manipulate Traffic Engineering (TE)
   Topologies. These models serve as base models that other technology
   specific models can augment. A YANG model has also been proposed in
   [I-D.draft-dharini-ccamp-dwdm-if-yang] to manage single channel
   optical interface parameters of DWDM applications, and in


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   [I-D.draft-ietf-ccamp-wson-yang] another model has been specified for
   the routing and wavelength assignment TE topology in wavelength
   switched optical networks (WSONs). None of them are specific for
   flexi-grid technology.

   Then, as stated before, we propose a model to describe a flexi-grid
   topology that is split in two YANG sub-modules:

   o Flexi-grid-TED: In order to be compatible with existing
     proposals, we augment the definitions contained in
     [I-D.draft-ietf-i2rs-yang-network-topo] and
     [I-D.draft-ietf-teas-yang-te-topo], by defining the different
     elements we can find in a flexi-grid network: a node, a transponder
     and a link. For that, each of those elements is defined as a
     container that includes a group of attributes. References to the
     elements are provided to be later used in the definition of a
     media channel. It also includes the data types for the type of
     modulation, the flexi-grid technology, the FEC, etc.
   o Media-channel: This module defines the whole path from a source
     transponder to the destination through a number of intermediate
     nodes and links. For this, it takes the information defined before
     in the flexi-grid TED. This module is described in
     [ID.draft-vergara-ccamp-flexigrid-media-channel-yang]

     The following section provides a detailed view of the first module.


4. Main building blocks of the Flexi-grid TED

   This section details the defined YANG module. It is listed below in
   section 6.


   The description of the three main components, flexi-grid-node,
   flexi-grid-transponder and flexi-grid-link is provided below.
   flexi-grid-sliceable-transponders are also defined.

   <flexi-grid-node> ::= <config> <state>

       <flexi-grid-node>: This element designates a node in the
       network.

       <config> ::= <flexi-grid-node-attributes-config>

           <config>: Contains the configuration of a node.
           <flexi-grid-node-attributes-config> ::= <list-interface>
           <connectivity_matrix>

               <flexi-grid-node-attributes-config>: Contains all the
               attributes related to the node configuration, such as
               its interfaces or its management addresses.


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                   <list-interface> ::= <name> <port-number>
                   <input-port> <output-port> <description>
                   <interface-type>
                   [<numbered-interface> / <unnumbered-interface>]

                       <list-interface>: The list containing all the
                       information of the interfaces.

                       <name>: Determines the interface name.

                       <port-number>: Port number of the interface.

                       <input-port>: Boolean value that defines
                       whether the interface is input or not.

                       <output-port>: Boolean value that defines
                       whether the interface is output or not.

                       <description>: Description of the usage of
                       the interface.

                       <interface-type>: Determines if the interface
                       is numbered or unnumbered.

                       <numbered-interface> ::= <n-i-ip-address>
                           <numbered-interface>: An interface with
                           its own IP address.

                           <n-i-ip-address>: Only available if
                           <interface-type> is "numbered-interface".
                           Determines the IP address of the interface.

                       <unnumbered-interface> ::= <u-i-ip-address>
                       <label>
                           <unnumbered-interface>: A interface that
                           needs a label to be unique.

                           <u-i-ip-address>: Only available if
                           <interface-type> is "numbered-interface".
                           Determines the node IP address, which with
                           the label defines the interface.

                           <label>: Label that determines the
                           interface, joint with the node IP address.

                   <connectivity-matrix> ::= <connections>

                       <connectivity-matrix>: Determines whether a
                       connection port in/port out exists.

                       <connections> ::= <input-port-id>
                       <output-port-id>


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<flexi-grid-transponder> ::= <transponder-type> <config> <state>


    <flexi-grid-transponder>: This item designates a transponder
    of a node.

    <config> ::= <flexi-grid-transponder-attributes-config>

        <config>: Contains the configuration of a transponder.

        <flexi-grid-transponder-attributes-config> ::=
        <available-operational-mode> <operational-mode>

            <flexi-grid-transponder-attributes>: Contains all the
            attributes related to the transponder.

               <available-operational-mode>: It provides a list of the
               operational modes available at this transponder.

               <operational-mode>: Determines the type of operational
               mode in use.

     <state> ::= <flexi-grid-transponder-attributes-config>
     <flexi-grid-transponder-attributes-state>

         <state>: Contains the state of a transponder.

         <flexi-grid-transponder-attributes-config>: See above.

         <flexi-grid-transponder-attributes-state>: Contains the
         state of a transponder.

 <link> ::= <config> <state>

     <link>: This element describes all the information of a link.

     <config> ::= <flexi-grid-link-attributes-config>

         <config>: Contains the configuration of a link.


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         <flexi-grid-link-attributes-config> ::= <technology-type>
         <available-label-flexi-grid> <N-max> <base-frequency>
         <nominal-central-frequency-granularity>
         <slot-width-granularity>

            <flexi-grid-link-attributes>: Contains all the
            attributes related to the link, such as its unique id,
            its N value, its latency, etc.

            <link-id>: Unique id of the link.

            <available-label-flexi-grid>: Array of bits that
            determines, with each bit, the availability of each
            interface for flexi-grid technology.

            <N-max>: The max value of N in this link, being N
            the number of slots.

            <base-frequency>: The default central frequency
            used in the link.

            <nominal-central-frequency-granularity>: It is the
            spacing between allowed nominal central frequencies
            and it is set to 6.25 GHz (note: sometimes referred
            to as 0.00625 THz).

            <slot-width-granularity>: 12.5 GHz, as defined
            in G.694.1.
    <state> ::= <flexi-grid-link-attributes-config>
    <flexi-grid-link-attributes-state>

        <state>: Contains the state of a link.

        <flexi-grid-link-attributes-config>: See above.

        <flexi-grid-link-attributes-state>: Contains all the
        the information related to the state of a link.


4.1. Formal Syntax

   The previous syntax specification uses the augmented Backus-Naur
   Form (BNF) as described in [RFC5234].


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5. 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.

   In order to configure a media channel to interconnect transponders A
   and E, first of all we have to populate the flexi-grid TED YANG model
   with all elements in the network:

   1. We define the transponders A and E, including their FEC type, if
      enabled, and modulation type. We also provide node identifiers
      and addresses for the transponders, as well as interfaces
      included in the transponders. Sliceable transponders can also be
      defined if needed.

   2. We do the same for the nodes B, C and D, providing their
      identifiers, addresses and interfaces, as well as the internal
      connectivity matrix between interfaces.

   3. Then, we also define the links 1 to 5 that interconnect nodes and
      transponders, indicating which flexi-grid labels are available.
      Other information, such as the slot frequency and granularity are
      also provided.


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   Next, 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. We refer to
   [I-D.draft-vergara-ccamp-flexigrid-media-channel-yang] to complete
   this example.


6. Flexi-grid TED YANG Model

6.1. Yang Model - Tree Structure

module: ietf-flexi-grid-topology
   augment /nd-s:networks/nd-s:network/nd-s:node/tet-s:te/
   tet-s:te-node-attributes:
    +--ro interfaces* [name]
       +--ro name                    string
       +--ro port-number?            uint32
       +--ro input-port?             boolean
       +--ro output-port?            boolean
       +--ro description?            string
       +--ro type?                   interface-type
       +--ro numbered-interface
       |  +--ro n-i-ip-address?   inet:ip-address
       +--ro unnumbered-interface
          +--ro u-i-ip-address?   inet:ip-address
          +--ro label?            uint32
flexi-grid-connectivity-matrix-attributes
   augment /nd:networks/nd:network/nd:node/tet:te/
   tet:te-node-attributes/tet:connectivity-matrices/
   tet:connectivity-matrix:
    +--rw connections* [input-port-id]
       +--rw input-port-id     flexi-grid-node-port-ref
       +--rw output-port-id?   flexi-grid-node-port-ref
flexi-grid-connectivity-matrix-attributes
   augment /nd-s:networks/nd-s:network/nd-s:node/tet-s:te/
   tet-s:te-node-attributes/tet-s:connectivity-matrices/
   tet-s:connectivity-matrix:
    +--ro connections* [input-port-id]
       +--ro input-port-id     flexi-grid-node-port-ref
       +--ro output-port-id?   flexi-grid-node-port-ref
flexi-grid-transponder
   augment /nd:networks/nd:network/nd:node/tet:te/
   tet:tunnel-termination-point:
    +--rw available-operational-mode*   operational-mode
    +--rw operational-mode?             operational-mode
flexi-grid-transponder
   augment /nd-s:networks/nd-s:network/nd-s:node/tet-s:te/
   tet-s:tunnel-termination-point:
    +--ro available-operational-mode*   operational-mode
    +--ro operational-mode?             operational-mode

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A.2. YANG Model - Code

   <CODE BEGINS> file "ietf-flexi-grid-ted@2017-07-03.yang"
module ietf-flexi-grid-ted {
  yang-version 1.1;

  namespace "urn:ietf:params:xml:ns:yang:ietf-flexi-grid-ted";
  prefix "fg-ted";

  import ietf-network {
    prefix "nd";
  }
  import ietf-network-state {
    prefix "nd-s";
  }
  import ietf-network-topology {
    prefix "lnk";
  }
  import ietf-network-topology-state {
    prefix "lnk-s";
  }
  import ietf-te-topology {
    prefix "tet";
  }
  import ietf-te-topology-state {
    prefix "tet-s";
  }
   import ietf-inet-types {
      prefix "inet";
   }

  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 Traffic Engineering Database (TED).

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


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         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 2017-07-03 {
         description
            "version 5.";

         reference
             "RFC XXX: A Yang Data Model for
             Flexi-Grid Optical Networks ";
      }

  /*
    Typedefs
  */


  typedef operational-mode {
    type string;
    description
      "Vendor-specific mode that guarantees interoperability.
       It must be an string with the following format:
       B-DScW-ytz(v) where all these attributes are conformant
       to the ITU-T recomendation";
      reference "ITU-T G.698.2 (11/2009) Section 5.3";
  }

  typedef interface-type {
         type enumeration {
            enum numbered-interface {
                description "The interface is numbered";
            }
            enum unnumbered-interface {
                description "The interface is unnumbered";
            }
         }
         description
            "Enumeration that defines if an interface is numbered or
            unnumbered";
  }


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   /*
      Typedef related to references
   */
      typedef flexi-grid-link-ref {
         type leafref {
            path
               "/nd:networks/nd:network/lnk:link/lnk:link-id";
         }

         description
            "This type is used by data models that need to reference
            a flexi-grid optical link.";
      }

      typedef flexi-grid-node-port-ref {
         type leafref {
            path "/nd:networks/nd:network/nd:node/tet:te/"
            +"tet:te-node-attributes/fg-ted:interfaces/"
            +"fg-ted:port-number";
         }
         description
            "This type is used by data models that need to reference
            a flexi-grid port.";
      }

      typedef flexi-grid-transponder-ref {
         type leafref {
            path "/nd:networks/nd:network/nd:node/tet:te/"+
            "tet:tunnel-termination-point/tet:tunnel-tp-id";
         }
         description
            "This type is used by data models that need to reference
            a trasponder.";
      }

   /*
      Groupings of attributes
   */
   grouping flexi-grid-network-type {
         container flexi-grid-network {
            presence "indicates a flexi-grid optical network";
            description "flexi-grid optical network";
         }
         description "If present, it indicates a flexi-grid
         optical TED network";
   }


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   grouping flexi-grid-node-attributes {
         description "Set of attributes of an optical node.";

         list interfaces {
            key "name";
            unique "port-number"; // TODO Puerto y TP ID
            description "List of interfaces contained in the node";
            leaf name {
               type string;
               description "Interface name";
            }
            leaf port-number {
               type uint32;
               description "Number of the port used by the interface";
            }

            leaf input-port {
               type boolean;
               description "Determines if the port is an input port";
            }
            leaf output-port {
               type boolean;
               description
               "Determines if the port is an output port";
            }
            leaf description {
               type string;
               description "Description of the interface";
            }
            leaf type {
               type interface-type;
               description "Determines the type of the interface";
            }
            container numbered-interface {
               when "../fg-ted:type =
               'numbered-interface'" {
                 description
                 "If the interface is a numbered interface";
               }
               description "Container that defines an numbered
               interface with an ip-address";
               leaf n-i-ip-address{
                  type inet:ip-address;
                  description "IP address of the numbered interface";
               }
            }

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            container unnumbered-interface {
               when "../fg-ted:type =
               'unnumbered-interface'" {
                 description
                   "If the interface is an unnumbered interface";
               }
               description "Container that defines an unnumbered
               interface with an ip-address and a label";
               leaf u-i-ip-address{
                  type inet:ip-address;
                  description "IP address of the interface";
               }
               leaf label {
                  type uint32;
                  description "Number as label for the interface";
               }
            }
         }
      }

   grouping flexi-grid-link-attributes {
         description "Set of attributes of an optical link";
            leaf-list available-label-flexi-grid {
               type bits {
                  bit is-available{
                    description "Set to 1 when it is available";
                  }
               }
               description
                  "Array of bits that determines whether a spectral
                  slot is available or not.";
            }

            leaf N-max {
               type int32;
               description "Maximum number of channels available.";
            }

            leaf base-frequency {
               type decimal64 {
                  fraction-digits 5;
               }
               units THz;
               default 193.1;
               description "Default central frequency";
               reference "rfc7698";
            }

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            leaf nominal-central-frequency-granularity {
               type decimal64 {
                  fraction-digits 5;
               }
               units GHz;
               default 6.25;
               description
                  "It is the spacing between allowed nominal central
                  frequencies and it is set to 6.25 GHz";
               reference "rfc7698";
            }

            leaf slot-width-granularity {
               type decimal64 {
                  fraction-digits 5;
               }
               units GHz;
               default 12.5;
               description "Minimum space between slot widths";
               reference "rfc7698";
            }
   }

   grouping flexi-grid-transponder-attributes {
      description "Configuration of an optical transponder";
      //TODO Validate attributes
      leaf-list available-operational-mode {
         type operational-mode;
         description "List of all vendor-specific supported
         mode identifiers";
      }

      leaf operational-mode {
         type operational-mode;
         description "Vendor-specific mode identifier";
      }
   }


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   grouping flexi-grid-connectivity-matrix-attributes {
      description "Connectivity matrix between the input and
          output ports";
      list connections {
         key "input-port-id";
         leaf input-port-id {
            type flexi-grid-node-port-ref;
            description "Identifier of the input port";
         }
         leaf output-port-id {
            type flexi-grid-node-port-ref;
            description "Identifier of the output port";
         }
         description "List of connections between input and
          output ports";
      }
   }

   /*
      Augments
   */
   augment "/nd:networks/nd:network/nd:network-types" {
            uses flexi-grid-network-type;
             description "Augment network-types including flexi-grid
             topology";
   }
   augment "/nd-s:networks/nd-s:network/nd-s:network-types" {
            uses flexi-grid-network-type;
             description "Augment network-types including flexi-grid
             topology";
   }
  augment "/nd:networks/nd:network/lnk:link/tet:te" +
   "/tet:te-link-attributes" {
    when "/nd:networks/nd:network/nd:network-types/
  fg-ted:flexi-grid-network" {
      description "Augment only for Flexigrid network.";
    }
    description "Augment link configuration";
    uses flexi-grid-link-attributes;
  }

  augment "/nd-s:networks/nd-s:network/lnk-s:link/tet-s:te" +
  "/tet-s:te-link-attributes" {
    when "/nd-s:networks/nd-s:network/nd-s:network-types/
  fg-ted:flexi-grid-network" {
      description "Augment only for Flexigrid network.";
    }

    description "Augment link state";
    uses flexi-grid-link-attributes;
  }

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   augment "/nd:networks/nd:network/nd:node/tet:te" +
   "/tet:te-node-attributes" {
      when "/nd:networks/nd:network/nd:network-types/
    fg-ted:flexi-grid-network" {
         description "Augment only for Flexigrid network.";
      }
      uses flexi-grid-node-attributes;
      description "Augment node config with flexi-grid attributes";
   }

   augment "/nd-s:networks/nd-s:network/nd-s:node/tet-s:te" +
   "/tet-s:te-node-attributes" {
      when "/nd-s:networks/nd-s:network/nd-s:network-types/
    fg-ted:flexi-grid-network" {
         description "Augment only for Flexigrid network.";
      }

      uses flexi-grid-node-attributes;
      description "Augment node state with flexi-grid attributes";
   }
   augment "/nd:networks/nd:network/nd:node/tet:te"+
         "/tet:te-node-attributes/tet:connectivity-matrices/"+
         "tet:connectivity-matrix" {
       when "/nd:networks/nd:network/nd:network-types/
     fg-ted:flexi-grid-network" {
          description "Augment only for Flexigrid network.";
       }

      uses flexi-grid-connectivity-matrix-attributes;
      description "Augment node connectivity-matrix for node config";
    }

    augment "/nd-s:networks/nd-s:network/nd-s:node/tet-s:te"+
         "/tet-s:te-node-attributes/tet-s:connectivity-matrices/"+
         "tet-s:connectivity-matrix" {
       when "/nd-s:networks/nd-s:network/nd-s:network-types/
     fg-ted:flexi-grid-network"{
          description "Augment only for Flexigrid network.";
       }


      uses flexi-grid-connectivity-matrix-attributes;
      description "Augment node connectivity-matrix for node config";
    }


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   augment "/nd:networks/nd:network/nd:node/tet:te"+
          "/tet:tunnel-termination-point" {
      when "/nd:networks/nd:network/nd:network-types/
      fg-ted:flexi-grid-network"{
          description "Augment only for Flexigrid network.";
       }
      uses flexi-grid-transponder-attributes;
      description "Augment node state with transponder attributes";
   }

   augment "/nd-s:networks/nd-s:network/nd-s:node/tet-s:te"+
          "/tet-s:tunnel-termination-point" {
      when "/nd-s:networks/nd-s:network/nd-s:network-types/
     fg-ted:flexi-grid-network"{
          description "Augment only for Flexigrid network.";
       }

      uses flexi-grid-transponder-attributes;
      description "Augment node state with transponder attributes";
   }

}

   <CODE ENDS>










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A.3. License

   Copyright (c) 2017 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.


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7. 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.

8. 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].


9. References

9.1. Normative References

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

   [RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
             Specifications: ABNF", STD 68, RFC 5234, January 2008,
             <http:/www.rfc-editor.org/info/rfc5234>.

   [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.



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9.2. 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-i2rs-yang-network-topo]  Clemm, A., Medved, J.,
         Varga, R., Bahadur, N., Ananthakrishnan, H., Liu, X.,
         "A Data Model for Network Topologies", Internet Draft
         draft-ietf-i2rs-yang-network-topo-14.txt, 2017.

   [I-D.draft-ietf-teas-yang-te-topo] Liu, X., Bryskin, I., Pavan
         Beeram, V., Saad, T., Shah, H., Gonzalez De Dios, O., "YANG
         Data Model for TE Topologies", Internet Draft
         draft-ietf-teas-yang-te-topo-10.txt, 2017

   [I-D.draft-dharini-ccamp-dwdm-if-yang] Galimberti, G., Kunze, R.,
         Lam, K., Hiremagalur, D., Grammel, G., Fang, L., Ratterree, G.,
         Eds., "A YANG model to manage the optical interface parameters
         for an external transponder in a WDM network", Internet Draft,
         draft-dharini-ccamp-dwdm-if-param-yang-02.txt, 2016.

   [I-D.draft-ietf-ccamp-wson-yang] Lee, Y. Dhody, D., Zhang, X., Guo,
         A., Lopez, V., King, D., Yoon, B.,"A Yang Data Model for WSON
         Optical Networks", Internet Draft,
         draft-ietf-ccamp-wson-yang-06.txt, 2017.

   [I-D.draft-vergara-ccamp-flexigrid-media-channel-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 media-channels", Internet Draft,
         draft-vergara-ccamp-flexigrid-media-channel-yang-00, 2017.


10. 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


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11. 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.

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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