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A YANG Data Model for Flexi-Grid Tunnels
draft-ietf-ccamp-flexigrid-tunnel-yang-01

Document Type Active Internet-Draft (ccamp WG)
Authors Universidad Autonoma de Madrid , Daniel Perdices Burrero , Daniel King , Victor Lopez , Italo Busi , Sergio Belotti , Gabriele Galimberti
Last updated 2022-07-11
Replaces draft-ietf-ccamp-flexigrid-media-channel-yang
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
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Yang Validation 0 errors, 1 warnings
Stream WG state WG Document
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draft-ietf-ccamp-flexigrid-tunnel-yang-01
CCAMP Working Group                                J.E. Lopez de Vergara
Internet-Draft                                               Naudit HPCN
Intended status: Informational                       D. Perdices Burrero
Expires: 12 January 2023                  Universidad Autonoma de Madrid
                                                                 D. King
                                                      Old Dog Consulting
                                                                V. Lopez
                                                                   Nokia
                                                                 I. Busi
                                                     Huawei Technologies
                                                              S. Belotti
                                                                   Nokia
                                                           G. Galimberti
                                                                   Cisco
                                                            11 July 2022

                A YANG Data Model for Flexi-Grid Tunnels
               draft-ietf-ccamp-flexigrid-tunnel-yang-01

Abstract

   This document defines a YANG model for managing flexi-grid optical
   tunnels (media-channels), complementing the information provided by
   the flexi-grid topology model.

   The YANG data model defined in this document conforms to the Network
   Management Datastore Architecture (NMDA).

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 https://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 12 January 2023.

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Copyright Notice

   Copyright (c) 2022 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 carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components
   extracted from this document must include Revised BSD License text as
   described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Flexi-Grid Tunnel Overview  . . . . . . . . . . . . . . . . .   3
   4.  Example of Use  . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  YANG Model for Flexi-Grid Tunnel  . . . . . . . . . . . . . .   6
     5.1.  YANG Tree . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.2.  YANG Code . . . . . . . . . . . . . . . . . . . . . . . .  19
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  38
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  39
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  39
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  39
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  39
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  39
     10.2.  Informative References . . . . . . . . . . . . . . . . .  40
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  40

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.

   While [I-D.ietf-ccamp-flexigrid-yang] focuses on flexi-grid objects
   such as nodes, transponders and links, this document presents a YANG
   [RFC7950] model for the flexi-grid tunnel (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.

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   This document identifies the flexi-grid tunne 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.  Terminology

   Refer to [RFC7446] and [RFC7699] for the key terms used in this
   document.

   The following terms are defined in [RFC7950] and are not redefined
   here:

   *  client

   *  server

   *  augment

   *  data model

   *  data node

   The following terms are defined in [RFC6241] and are not redefined
   here:

   *  configuration data

   *  state data

   The terminology for describing YANG data models is found in
   [RFC7950].

3.  Flexi-Grid Tunnel Overview

   The present model defines a flexi-grid tunnel mainly composed of:

   *  source address

   *  source flexi-grid port

   *  source flexi-grid transponder

   *  destination address

   *  destination flexi-grid port

   *  destination flexi-grid transponder

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   *  list of links that defines the path

   *  other optical attributes

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

   This is achieved by a combination of the traffic engineering tunnel
   attributes explained in [I-D.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, the following example is
   provided.  An optical network usually has multiple transponders,
   switches (nodes) and links.  Figure 1 shows a simple topology, where
   two physical paths interconnect two optical transponders.

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                                  Tunnel
      <==============================================================>
                          Flexi-grid Tunnel Group x
             <~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~>

    +------------+                                        +------------+
    |  Flexi-    |                                        |  Flexi-    |
    |   grid     |                                        |   grid     |
    |  node A    |                                        |  node E    |
    |            |        +------+        +------+        |            |
    |            | Link 1 |Flexi-| Link 2 |Flexi-| Link 3 |            |
    |            |<------>| grid |<------>| grid |<------>|            |
    |.........   |        |node B|        |node C|        |   .........|
    | Trans- :   |        +------+        +------+        |   : Trans- |
    | ponder :   |                                        |   : ponder |
    |    A   :   |              +----------+              |   :    E   |
    |........:   |     Link 4   |Flexi-grid|   Link 5     |   :........|
    |            |              |    D     |              |            |
    |            |<------------>|   node   |<------------>|            |
    |            |              +----------+              |            |
    +------------+                                        +------------+

             <~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~>
                           Flexi-grid Tunnel Group y

                       Figure 1: Topology Example

   To configure a network tunnel to interconnect transponders A and E,
   first of all we have to populate the flexi-grid topology YANG model
   with all elements in the network:

   *  We define the transponders within nodes A and E as tunnel
      termination points (TTPs) and provide their internal local link
      connectivity towards the node interfaces.  We also provide nodes A
      and B identifiers, addresses and interfaces.

   *  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.

   *  Then, we also define the links 1 to 5 that interconnect nodes,
      indicating which flexi-grid labels are available.

   *  Other information, such as the slot frequency and granularity are
      also provided.

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   After the nodes, links and transponders have been defined using
   [I-D.ietf-ccamp-flexigrid-yang] we can configure the tunnel from the
   information we have stored in the flexi-grid topology, 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 topology has a reference, and this is the way in which they are
   called in the tunnel.

   *  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 tunnel, with
      source transponder A and source node B, and destination
      transponder E and destination node C.  Thus, we are going to
      follow path x.

   *  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.

   *  Finally, the flexi-grid topology has to be updated with each
      element usage status each time a tunnel is created or torn down.

5.  YANG Model for Flexi-Grid Tunnel

5.1.  YANG Tree

   module: ietf-flexi-grid-tunnel

     augment /te:te/te:tunnels/te:tunnel:
       +--rw fec-type?           identityref
       +--rw termination-type?   identityref
       +--rw bit-stuffing?       boolean
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-in-segment
               /te:label-restrictions/te:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-out-segment
               /te:label-restrictions/te:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref

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          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-in-segment/te:label-restrictions
               /te:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-out-segment/te:label-restrictions
               /te:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16

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          +--rw max-slot-width-factor?    uint16
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint
               /te:explicit-route-objects-always
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint
               /te:explicit-route-objects-always
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)

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          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-in-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-out-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:optimizations/te:algorithm/te:metric

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               /te:optimization-metric/te:explicit-route-exclude-objects
               /te:route-object-exclude-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:optimizations/te:algorithm/te:metric
               /te:optimization-metric/te:explicit-route-include-objects
               /te:route-object-include-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:explicit-route-objects-always
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:explicit-route-objects-always
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m

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             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-start/te:te-label
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-end/te:te-label
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-step/te:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:computed-paths-properties
               /te:computed-path-properties/te:path-properties
               /te:path-route-objects/te:path-route-object/te:type
               /te:label/te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?

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             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path/te:optimizations
               /te:algorithm/te:metric/te:optimization-metric
               /te:explicit-route-exclude-objects
               /te:route-object-exclude-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path/te:optimizations
               /te:algorithm/te:metric/te:optimization-metric
               /te:explicit-route-include-objects
               /te:route-object-include-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:explicit-route-objects-always
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)

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                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:explicit-route-objects-always
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-start/te:te-label
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-end/te:te-label
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-step/te:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-out-segment/te:label-restrictions
               /te:label-restriction/te:label-start/te:te-label
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-out-segment/te:label-restrictions

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               /te:label-restriction/te:label-end/te:te-label
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-out-segment/te:label-restrictions
               /te:label-restriction/te:label-step/te:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:computed-paths-properties/te:computed-path-properties
               /te:path-properties/te:path-route-objects
               /te:path-route-object/te:type/te:label/te:label-hop
               /te:te-label/te:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:optimizations/te:algorithm
               /te:metric/te:optimization-metric
               /te:explicit-route-exclude-objects
               /te:route-object-exclude-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:optimizations/te:algorithm
               /te:metric/te:optimization-metric
               /te:explicit-route-include-objects
               /te:route-object-include-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)

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          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:explicit-route-objects-always
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:explicit-route-objects-always
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-in-segment

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               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:computed-paths-properties
               /te:computed-path-properties/te:path-properties
               /te:path-route-objects/te:path-route-object/te:type
               /te:label/te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:optimizations/te:algorithm
               /te:metric/te:optimization-metric
               /te:explicit-route-exclude-objects
               /te:route-object-exclude-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n

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             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:optimizations/te:algorithm
               /te:metric/te:optimization-metric
               /te:explicit-route-include-objects
               /te:route-object-include-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path
               /te:explicit-route-objects-always
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path
               /te:explicit-route-objects-always
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m

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     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:computed-paths-properties
               /te:computed-path-properties/te:path-properties
               /te:path-route-objects/te:path-route-object/te:type
               /te:label/te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m

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             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /te:te/te:lsps/te:lsp/te:lsp-record-route-information
               /te:lsp-record-route-information/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m

5.2.  YANG Code

   <CODE BEGINS> file "ietf-flexi-grid-tunnel@2022-07-11.yang"
   module ietf-flexi-grid-tunnel {
     yang-version 1.1;
     namespace
       "urn:ietf:params:xml:ns:yang:ietf-flexi-grid-tunnel";
     prefix "flexg-tnl";

     import ietf-te {
       prefix "te";
       revision-date "2022-07-11";
       reference
         "I-D.ietf-teas-yang-te-19: A YANG Data Model for Traffic
         Engineering Tunnels and Interfaces. ";
     }

     import ietf-layer0-types {
       prefix "l0-types";
     }

     import ietf-layer0-types-ext {
       prefix "l0-types-ext";
     }

     organization
       "IETF CCAMP Working Group";
     contact
       "WG Web:   <http://tools.ietf.org/wg/ccamp/>

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        WG List:  <mailto:ccamp@ietf.org>
        Editor:   Jorge E. Lopez de Vergara
                  <jorge.lopez_vergara@uam.es>
        Editor:   Daniel Perdices
                  <daniel.perdices@naudit.es>
        Editor:   Victor Lopez
                  <victor.lopez@nokia.com>
        Editor:   Young Lee
                  <leeyoung@huawei.com>";

     description
       "This module defines a model for Flex-grid Tunnel
       Services.
       The model fully conforms to the Network Management
       Datastore Architecture (NMDA).

       Copyright (c) 2022 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
       (https://trustee.ietf.org/license-info).
       This version of this YANG module is part of RFC XXXX; see
       the RFC itself for full legal notices.";

     revision "2022-07-11" {
       description
         "Initial Revision";
       reference
         "RFC XXXX: YANG data model for Flexi-Grid tunnels";
       // RFC Ed.: replace XXXX with actual RFC number, update date
       // information and remove this note
     }

     /*
      * Data nodes
      */

     augment "/te:te/te:tunnels/te:tunnel" {
       description
         "Augment with additional parameters required for flexi-grid
         tunnels.";
       uses l0-types-ext:l0-tunnel-attributes;
     }

     /*

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      * Augment TE label range information
      */

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-in-segment/"
           + "te:label-restrictions/te:label-restriction" {
       description
         "Augment TE label range information for the ingress segment
         of the named path constraint.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-out-segment/"
           + "te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the egress segment
         of the named path constraint.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the ingress segment
         of the primay path.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the egress segment
         of the primay path.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description

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         "Augment TE label range information for the ingress segment
         of the primay reverse path.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the egress segment
         of the primay reverse path.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the ingress segment
         of the secondary path.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the egress segment
         of the secondary path.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the ingress segment
         of the secondary reverse path.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"

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           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the egress segment
         of the secondary reverse path.";
       uses l0-types:flexi-grid-label-range-info;
     }

     /*
      * Augment TE label.
      */

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/"
           + "te:explicit-route-objects-always/"
           + "te:route-object-exclude-always/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects always
         excluded by the path computation with the named path
         constraint.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/"
           + "te:explicit-route-objects-always/"
           + "te:route-object-include-exclude/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects included
         or excluded by the path computation with the named path
         constraint.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-in-segment/"
           + "te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the ingress segment
         of the named path constraint.";

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       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-in-segment/"
           + "te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the ingress segment
         of the named path constraint.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-in-segment/"
           + "te:label-restrictions/te:label-restriction/"
           + "te:label-step/te:technology" {
       description
         "Augment TE label range step for the ingress segment
         of the named path constraint.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-out-segment/"
           + "te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the egress segment
         of the named path constraint.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-out-segment/"
           + "te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {

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       description
         "Augment TE label range end for the egress segment
         of the named path constraint.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-out-segment/"
           + "te:label-restrictions/te:label-restriction/"
           + "te:label-step/te:technology" {
       description
         "Augment TE label range step for the egress segment
         of the named path constraint.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/te:explicit-route-exclude-objects/"
           + "te:route-object-exclude-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
         route objects excluded by the path computation of the primary
         path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/te:explicit-route-include-objects/"
           + "te:route-object-include-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
         route objects included by the path computation of the primary
         path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }

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     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:explicit-route-objects-always/"
           + "te:route-object-exclude-always/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects always
         excluded by the path computation of the primary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:explicit-route-objects-always/"
           + "te:route-object-include-exclude/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects included
         or excluded by the path computation of the primary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the ingress segment
         of the primay path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the ingress segment

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         of the primay path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the ingress segment
         of the primay path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the egress segment
         of the primay path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the egress segment
         of the primay path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {

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       description
         "Augment TE label range end for the egress segment
         of the primay path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:computed-paths-properties/"
           + "te:computed-path-properties/te:path-properties/"
           + "te:path-route-objects/te:path-route-object/"
           + "te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the route object of the computed
         primary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/te:explicit-route-exclude-objects/"
           + "te:route-object-exclude-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
         route objects excluded by the path computation of the primary
         reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/te:explicit-route-include-objects/"
           + "te:route-object-include-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit

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         route objects included by the path computation of the primary
         reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:explicit-route-objects-always/"
           + "te:route-object-exclude-always/"
           + "te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects always
         excluded by the path computation of the primary reverse
         path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:explicit-route-objects-always/"
           + "te:route-object-include-exclude/"
           + "te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects included
         or excluded by the path computation of the primary reverse
         path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the ingress segment
         of the primay reverse path.";

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       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the ingress segment
         of the primay reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the ingress segment
         of the primay reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the egress segment
         of the primay reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"

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           + "te:primary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the egress segment
         of the primay reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the egress segment
         of the primay reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:computed-paths-properties/te:computed-path-properties/"
           + "te:path-properties/te:path-route-objects/"
           + "te:path-route-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the route object of the computed
         primary reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/te:explicit-route-exclude-objects/"
           + "te:route-object-exclude-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit

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         route objects excluded by the path computation of the
         secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/te:explicit-route-include-objects/"
           + "te:route-object-include-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
         route objects included by the path computation of the
         secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:explicit-route-objects-always/"
           + "te:route-object-exclude-always/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects always
         excluded by the path computation of the secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:explicit-route-objects-always/"
           + "te:route-object-include-exclude/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects included
         or excluded by the path computation of the secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

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     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the ingress segment
         of the secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the ingress segment
         of the secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }
     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the ingress segment
         of the secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the egress segment
         of the secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }

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     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the egress segment
         of the secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the egress segment
         of the secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:computed-paths-properties/"
           + "te:computed-path-properties/"
           + "te:path-properties/te:path-route-objects/"
           + "te:path-route-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the route object of the computed
         secondary path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/te:explicit-route-exclude-objects/"
           + "te:route-object-exclude-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {

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       description
         "Augment TE label hop for the optimization of the explicit
         route objects excluded by the path computation of the
         secondary reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/te:explicit-route-include-objects/"
           + "te:route-object-include-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
         route objects included by the path computation of the
         secondary reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:explicit-route-objects-always/"
           + "te:route-object-exclude-always/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects always
         excluded by the path computation of the secondary reverse
         path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:explicit-route-objects-always/"
           + "te:route-object-include-exclude/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects included
         or excluded by the path computation of the secondary reverse
         path.";
       case flexi-grid {

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         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the ingress segment
         of the secondary reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the ingress segment
         of the secondary reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the ingress segment
         of the secondary reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description

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         "Augment TE label range start for the egress segment
         of the secondary reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the egress segment
         of the secondary reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the egress segment
         of the secondary reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:computed-paths-properties/"
           + "te:computed-path-properties/"
           + "te:path-properties/te:path-route-objects/"
           + "te:path-route-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the route object of the computed
         secondary reverse path.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/te:te/te:lsps/"

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           + "te:lsp/te:lsp-record-route-information/"
           + "te:lsp-record-route-information/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the record route of the LSP.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }
   }
   <CODE ENDS>

6.  Security Considerations

   The configuration, state, and action data defined in this document
   are designed to be accessed via a management protocol with a secure
   transport layer, such as NETCONF [RFC6241] or RESTCONF [RFC8040].
   The NETCONF access control model [RFC8341] provides the means to
   restrict access for particular NETCONF users to a preconfigured
   subset of all available NETCONF protocol operations and content.

   There are a number of data nodes defined in this YANG module that are
   writable/creatable/deletable (i.e., config true, which is the
   default).  These data nodes may be considered sensitive or vulnerable
   in some network environments.  Write operations (e.g., edit-config)
   to these data nodes without proper protection can have a negative
   effect on network operations.  These are the subtrees and data nodes
   and their sensitivity/vulnerability:

   *  /te:te/te:tunnels/te:tunnel

   *  /te:te/.../te:te-bandwidth/te:technology

   *  /te:te/.../te:type/te:label/te:label-hop/te:te-label/te:technology

   *  /te:te/.../te:label-restrictions/te:label-restriction/te:label-
      start/te:te-label/te:technology

   *  /te:te/.../te:label-restrictions/te:label-restriction/te:label-
      end/te:te-label/te:technology

   *  /te:te/.../te:label-restrictions/te:label-restriction/

   Editors note: we are using simplified description by folding similar
   branches to avoid repetition.

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7.  IANA Considerations

   To be discussed.

8.  Contributors

   This work was developed by several additional people, who due to
   frontpage author restrictions, are listed below:

   Zafar Ali Cisco Email: zali@cisco.com

   Daniel Michaud Vallinoto Universidad Autonoma de Madrid Email:
   daniel.michaud@estudiante.uam.es

   Young Lee Samsung Email: younglee.tx@gmail.com

   Oscar Gonzalez de Dios Telefonica I+D/GCTO Email:
   oscar.gonzalezdedios@telefonica.com

9.  Acknowledgments

   This work is also partially funded by the Spanish State Research
   Agency under the project AgileMon (AEI PID2019-104451RB-C21) and by
   the Spanish Ministry of Science, Innovation and Universities under
   the program for the training of university lecturers (Grant number:
   FPU19/05678).

10.  References

10.1.  Normative References

   [I-D.ietf-ccamp-flexigrid-yang]
              Mendez, J. E. L. D. V., Burrero, D. P., King, D., Lee, Y.,
              and H. Zheng, "A YANG Data Model for Flexi-Grid Optical
              Networks", Work in Progress, Internet-Draft, draft-ietf-
              ccamp-flexigrid-yang-13, 10 July 2022,
              <https://www.ietf.org/archive/id/draft-ietf-ccamp-
              flexigrid-yang-13.txt>.

   [I-D.ietf-teas-yang-te]
              Saad, T., Gandhi, R., Liu, X., Beeram, V. P., Bryskin, I.,
              and O. G. D. Dios, "A YANG Data Model for Traffic
              Engineering Tunnels, Label Switched Paths and Interfaces",
              Work in Progress, Internet-Draft, draft-ietf-teas-yang-te-
              29, 7 February 2022, <https://www.ietf.org/archive/id/
              draft-ietf-teas-yang-te-29.txt>.

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   [RFC6241]  Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
              and A. Bierman, Ed., "Network Configuration Protocol
              (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
              <https://www.rfc-editor.org/info/rfc6241>.

   [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, <https://www.rfc-editor.org/info/rfc7699>.

   [RFC7950]  Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
              RFC 7950, DOI 10.17487/RFC7950, August 2016,
              <https://www.rfc-editor.org/info/rfc7950>.

   [RFC8040]  Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
              Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
              <https://www.rfc-editor.org/info/rfc8040>.

   [RFC8341]  Bierman, A. and M. Bjorklund, "Network Configuration
              Access Control Model", STD 91, RFC 8341,
              DOI 10.17487/RFC8341, March 2018,
              <https://www.rfc-editor.org/info/rfc8341>.

10.2.  Informative References

   [RFC7446]  Lee, Y., Ed., Bernstein, G., Ed., Li, D., and W. Imajuku,
              "Routing and Wavelength Assignment Information Model for
              Wavelength Switched Optical Networks", RFC 7446,
              DOI 10.17487/RFC7446, February 2015,
              <https://www.rfc-editor.org/info/rfc7446>.

   [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,
              <https://www.rfc-editor.org/info/rfc7698>.

Authors' Addresses

   Jorge E. Lopez de Vergara Mendez
   Naudit HPCN
   Email: jorge.lopez_vergara@uam.es

   Daniel Perdices Burrero
   Universidad Autonoma de Madrid
   Email: daniel.perdices@uam.es

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   Daniel King
   Old Dog Consulting
   Email: daniel@olddog.co.uk

   Victor Lopez
   Nokia
   Email: victor.lopez@nokia.com

   Italo Busi
   Huawei Technologies
   Email: Italo.Busi@huawei.com

   Sergio Belotti
   Nokia
   Email: sergio.belotti@nokia.com

   G. Galimberti
   Cisco
   Email: ggalimbe@cisco.com

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