A YANG Data Model for Flexi-Grid Optical Networks
draft-ietf-ccamp-flexigrid-yang-10

Document Type Active Internet-Draft (ccamp WG)
Authors Universidad de Madrid  , Daniel Burrero  , Daniel King  , Young Lee  , Haomian Zheng 
Last updated 2021-07-12
Replaces draft-vergara-ccamp-flexigrid-yang
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CCAMP Working Group                                  J. Lopez de Vergara
Internet-Draft                                               Naudit HPCN
Intended status: Informational                       D. Perdices Burrero
Expires: January 13, 2022                 Universidad Autonoma de Madrid
                                                                 D. King
                                                      Old Dog Consulting
                                                                  Y. Lee
                                                                 Samsung
                                                                H. Zheng
                                                     Huawei Technologies
                                                           July 12, 2021

           A YANG Data Model for Flexi-Grid Optical Networks
                   draft-ietf-ccamp-flexigrid-yang-10

Abstract

   This document defines a YANG module for managing flexi-grid optical
   networks.  The model defined in this document specifies a flexi-grid
   traffic engineering database that is used to describe the topology of
   a flexi-grid network.  It is based on and augments existing YANG
   models that describe network and traffic engineering topologies.

   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 January 13, 2022.

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Copyright Notice

   Copyright (c) 2021 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 Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Tree Diagram  . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Prefixes in Data Node Names . . . . . . . . . . . . . . .   4
   4.  Example of Use  . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  YANG Data Model for Flexi-Grid Topology . . . . . . . . . . .   5
     5.1.  Flexi-Grid Topology Data Model Overview . . . . . . . . .   5
     5.2.  Attributes Augmentation . . . . . . . . . . . . . . . . .   6
     5.3.  Bandwidth Augmentation  . . . . . . . . . . . . . . . . .   7
     5.4.  Label Augmentation  . . . . . . . . . . . . . . . . . . .   7
   6.  YANG Model (Tree Structure) for Flexi-Grid Topology . . . . .   8
   7.  The YANG Code for Flexi-grid topology . . . . . . . . . . . .  25
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  59
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  60
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  61
   11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  61
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  62
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  62
     12.2.  Informative References . . . . . . . . . . . . . . . . .  63
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  64

1.  Introduction

   The flexible grid (flexi-grid) optical network technology defined by
   the International Telecommunication Union Telecommunication
   Standardization Sector (ITU-T) and documented in Recommendation
   G.694.1 [G.694.1] and G.872 [G.872] provides an enhanced Dense
   Wavelength Division Multiplexing (DWDM) grid by defining a set of
   nominal central frequencies, slot widths, and the concept of the
   "frequency slot".  This technology increases both transport network

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   scalability and flexibility, allowing the optimization of bandwidth
   usage.

   [RFC7698] provides a framework for GMPLS-Based control of flexi-grid
   DWDM networks while [RFC7699] defines generalized labels for the use
   of GMPLS in flexi-grid networks.

   This document presents a YANG data model [RFC7950] for flexi-grid
   objects in the dynamic optical network, including nodes, transponders
   and links, as well as how such links interconnect nodes.

   This document identifies the flexi-grid components, parameters and
   their values, characterizes the features and the performances of the
   flexi-grid elements.  For this, it augments [RFC8795], and imports
   the generic Layer 0 types and use of "media-channel" defined in
   [I-D.ietf-ccamp-layer0-types].

   An application example in Section 4 is also provided to better
   understand the utility of this YANG model.

   A partner document defines a second YANG module that described flexi-
   grid tunnels, i.e., the paths from source to destination through a
   number of intermediate nodes
   [I-D.ietf-ccamp-flexigrid-media-channel-yang].

   Impairment-aware traffic engineering topology is described in
   [I-D.ietf-ccamp-optical-impairment-topology-yang].

   The YANG data model defined in this document conforms to the Network
   Management Datastore Architecture (NMDA) [RFC8342].

2.  Terminology

   Refer to [RFC7698] and [RFC7699] for the key terms used in this
   document.

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

   o  client

   o  server

   o  augment

   o  data model

   o  data node

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

   o  configuration data

   o  state data

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

3.  Tree Diagram

   A simplified graphical representation of the data model is used in
   this document.  The meaning of the symbols in these diagrams is
   defined in [RFC8340].

3.1.  Prefixes in Data Node Names

   In this document, names of data nodes and other data model objects
   are prefixed using the standard prefix associated with the
   corresponding YANG imported modules, as shown in Figure 1.  It uses
   prefixes from [I-D.ietf-ccamp-layer0-types], [RFC8345], and
   [RFC8795].

         +-------------+-------------------------+-----------------+
         | Prefix      | YANG module             | Reference       |
         +-------------+-------------------------+-----------------+
         | l0-types    | ietf-layer0-types       | [RFCXXXX]       |
         | flexgt      | ietf-flexi-grid-topology| [RFCYYYY]       |
         | nw          | ietf-network            | [RFC8345]       |
         | nt          | ietf-network-topology   | [RFC8345]       |
         | tet         | ietf-te-topology        | [RFC8795]       |
         +-------------+-------------------------+-----------------+

             Figure 1: Prefixes and Corresponding YANG modules

   RFC Editor Note: Please replace XXXX with the RFC numbers assigned to
   [I-D.ietf-ccamp-layer0-types].  Please replace YYYY with the RFC
   number assigned to this document.  Please remove this note.

4.  Example of Use

   In order to explain how this model is used, we provide the following
   example.  An optical network usually has multiple transponders,
   switches (nodes) and links.  Figure 1 shows a simple topology.

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      +----------+                                        +----------+
      |  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     | :........|
      |          |<------------>|   node   |<------------>|          |
      |          |              |    D     |              |          |
      |          |              +----------+              |          |
      +----------+                                        +----------+

                        Figure 2: Topology Example

   In order to configure a network media channel 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:

   o  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.

   o  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.

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

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

5.  YANG Data Model for Flexi-Grid Topology

5.1.  Flexi-Grid Topology Data Model Overview

   This document aims to describe the data model for Flexi-Grid
   topology.  As a classic Traffic-engineering (TE) technology, Flexi-
   Grid provide WDM switching in transport network.  Therefore the YANG

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   module presented in this document augments from a more generic
   Traffic Engineered (TE) network topology data model, i.e., the ietf-
   te-topology, as specified in [RFC8795], following the guidelines
   provided in section 6 of [RFC8795].

   Common types, identities and groupings defined in
   [I-D.ietf-ccamp-layer0-types] are reused in this document.

   The figure below shows the augmentation relationship between YANG
   models.

                        +-------------------------+
           TE generic   |    ietf-te-topology     |
                        +-------------------------+
                                     ^
                                     |
                                     | Augments
                                     |
                        +------------+-------------+
           Flexi-Grid   | ietf-flexi-grid-topology |
                        +--------------------------+

     Figure 3: Relationship between Flexi-Grid and TE topology models

   The entities and TE attributes, such as node, termination points and
   links, are still applicable for describing an Flexi-Grid topology and
   the model presented in this document only specifies with technology-
   specific attributes/information.

   The Flexi-Grid specific attributes in [RFC7699], including the grid
   type, channel spacing, slot width granularity, n and m parameters,
   can be used to represent the label information.  These attributes
   have been specified in [I-D.ietf-ccamp-layer0-types], and used in
   this document for augmentation of the generic TE topology model.

   The YANG module ietf-flexi-grid-topology defined in this document
   conforms to the Network Management Datastore Architecture (NMDA)
   defined in [RFC8342].

5.2.  Attributes Augmentation

   There are a few characteristics augmenting to the generic TE
   topology.

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   Following the guidelines in [RFC8795], a flexi-grid-topology network-
   type is specified as the indicator of Flexi-Grid in the topology as
   follows.

       augment /nw:networks/nw:network/nw:network-types/tet:te-topology:
         +--rw flexi-grid-topology!

                Figure 4: Flexi-Grid Topology Augmentation

   A flexi-grid-node presence container is specified, augmenting the
   generic TE node attributes, to indicate that the TE node is a Flexi-
   Grid node

          augment /nw:networks/nw:network/nw:node/tet:te
                  /tet:te-node-attributes:
            +--rw flexi-grid-node!

                   Figure 5: Flex-Grid Node Augmentation

   It is assumed that all the Flexi-Grid nodes are reconfigurable.

5.3.  Bandwidth Augmentation

   As described in Section 4.2 of [RFC7699], there is some overlap
   between bandwidth and label in layer0.

   The flexi-grid label resource information described in section 5.4,
   is sufficient to describe also the spectrum resources within a flexi-
   grid network.  Therefore, the model does not define any augmentation
   for the te-bandwidth containers defined in [RFC8795].

5.4.  Label Augmentation

   The model augments all the occurrences of the label-restriction list
   with flexi-grid technology specific attributes using the flexi-grid-
   label-range-info grouping defined in [I-D.ietf-ccamp-layer0-types].

   The Flexi-Grid label resource information described in section 5.4,
   is sufficient to describe also the spectrum resources within a flexi-
   Grid network.  Therefore, the YANG model does not define any

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   augmentation for the te-bandwidth containers defined in
   [I-D.ietf-ccamp-layer0-types].

   Moreover, following the guidelines in [RFC8795], the model augments
   all the occurrences of the te-label container with the flexi-Grid
   technology specific attributes using the flexi-grid-label-start-end,
   flexi-grid-label-hop and flexi-grid-label-step groupings defined in
   [I-D.ietf-ccamp-layer0-types].

6.  YANG Model (Tree Structure) for Flexi-Grid Topology

   module: ietf-flexi-grid-topology
     augment /nw:networks/nw:network/nw:network-types/tet:te-topology:
       +--rw flexi-grid-topology!
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes:
       +--rw flexi-grid-node!
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:label-restrictions/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet: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 /nw:networks/nw:network/nw:node/tet:te

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               /tet:information-source-entry/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction:
       +--ro grid-type?    identityref
       +--ro priority?     uint8
       +--ro flexi-grid
          +--ro slot-width-granularity?   identityref
          +--ro min-slot-width-factor?    uint16
          +--ro max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction:
       +--ro grid-type?    identityref
       +--ro priority?     uint8
       +--ro flexi-grid
          +--ro slot-width-granularity?   identityref
          +--ro min-slot-width-factor?    uint16
          +--ro max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction:
       +--ro grid-type?    identityref
       +--ro priority?     uint8
       +--ro flexi-grid
          +--ro slot-width-granularity?   identityref
          +--ro min-slot-width-factor?    uint16
          +--ro max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:label-restrictions
               /tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:label-restrictions
               /tet: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 /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:label-restrictions
               /tet: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 /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:label-restrictions
               /tet:label-restriction:
       +--ro grid-type?    identityref
       +--ro priority?     uint8
       +--ro flexi-grid
          +--ro slot-width-granularity?   identityref
          +--ro min-slot-width-factor?    uint16
          +--ro max-slot-width-factor?    uint16
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:label-restrictions
               /tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-start/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-end/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te

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               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:underlay/tet:primary-path/tet:path-element/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:underlay/tet:backup-path/tet:path-element/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:optimizations/tet:algorithm/tet:metric
               /tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:optimizations/tet:algorithm/tet:metric
               /tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:

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       +--:(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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:path-properties/tet:path-route-objects
               /tet:path-route-object/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label

Lopez de Vergara, et al.Expires January 13, 2022               [Page 12]
Internet-Draft               Flexi-Grid YANG                   July 2021

               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:underlay/tet:primary-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:underlay/tet:backup-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:optimizations/tet:algorithm

Lopez de Vergara, et al.Expires January 13, 2022               [Page 13]
Internet-Draft               Flexi-Grid YANG                   July 2021

               /tet:metric/tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:optimizations/tet:algorithm
               /tet:metric/tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:path-properties
               /tet:path-route-objects/tet:path-route-object/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-start/tet:te-label/tet:technology:
       +--:(flexi-grid)

Lopez de Vergara, et al.Expires January 13, 2022               [Page 14]
Internet-Draft               Flexi-Grid YANG                   July 2021

          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-end/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--ro flexi-grid-channel-spacing?   identityref
          +--ro flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:underlay/tet:primary-path/tet:path-element/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:underlay/tet:backup-path/tet:path-element/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:optimizations/tet:algorithm/tet:metric
               /tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)

Lopez de Vergara, et al.Expires January 13, 2022               [Page 15]
Internet-Draft               Flexi-Grid YANG                   July 2021

          +--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 /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:optimizations/tet:algorithm/tet:metric
               /tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:path-properties/tet:path-route-objects
               /tet:path-route-object/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions

Lopez de Vergara, et al.Expires January 13, 2022               [Page 16]
Internet-Draft               Flexi-Grid YANG                   July 2021

               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--ro flexi-grid-channel-spacing?   identityref
          +--ro flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--ro flexi-grid-channel-spacing?   identityref
          +--ro flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:underlay/tet:primary-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices

Lopez de Vergara, et al.Expires January 13, 2022               [Page 17]
Internet-Draft               Flexi-Grid YANG                   July 2021

               /tet:connectivity-matrix/tet:underlay/tet:backup-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:optimizations/tet:algorithm
               /tet:metric/tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:optimizations/tet:algorithm
               /tet:metric/tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:path-properties
               /tet:path-route-objects/tet:path-route-object/tet:type

Lopez de Vergara, et al.Expires January 13, 2022               [Page 18]
Internet-Draft               Flexi-Grid YANG                   July 2021

               /tet:label/tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:underlay
               /tet:primary-path/tet:path-element/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:underlay

Lopez de Vergara, et al.Expires January 13, 2022               [Page 19]
Internet-Draft               Flexi-Grid YANG                   July 2021

               /tet:backup-path/tet:path-element/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:optimizations
               /tet:algorithm/tet:metric/tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:optimizations
               /tet:algorithm/tet:metric/tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:path-properties
               /tet:path-route-objects/tet:path-route-object/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet:technology:

Lopez de Vergara, et al.Expires January 13, 2022               [Page 20]
Internet-Draft               Flexi-Grid YANG                   July 2021

       +--:(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 /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:underlay
               /tet:primary-path/tet:path-element/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:underlay/tet:backup-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:optimizations
               /tet:algorithm/tet:metric/tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:optimizations
               /tet:algorithm/tet:metric/tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet: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

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                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:path-properties
               /tet:path-route-objects/tet:path-route-object/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet: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 /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:underlay/tet:primary-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:underlay/tet:backup-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n

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     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--ro flexi-grid-channel-spacing?   identityref
          +--ro flexi-n-step?                 uint8
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:underlay/tet:primary-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:underlay/tet:backup-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet: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 /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8

7.  The YANG Code for Flexi-grid topology

   <CODE BEGINS> file "ietf-flexi-grid-topology@2020-02-22.yang"
   module ietf-flexi-grid-topology {
     yang-version 1.1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-flexi-grid-topology";
     prefix "flexgt";

     import ietf-network {
       prefix "nw";
       reference
         "RFC 8345: A YANG Data Model for Network Topologies";
     }

     import ietf-network-topology {
       prefix "nt";
       reference
         "RFC 8345: A YANG Data Model for Network Topologies";

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     }

     import ietf-te-topology {
       prefix "tet";
       reference
         "RFC 8795: YANG Data Model for Traffic Engineering
          (TE) Topologies";
     }

     import ietf-layer0-types {
       prefix "l0-types";
       reference
         "RFC XXXX: A YANG Data Model for Layer 0 Types";
     }

   /* Note: The RFC Editor will replace XXXX with the number assigned
      to the RFC once draft-ietf-ccamp-layer0-types becomes an RFC.*/

     organization
        "IETF CCAMP Working Group";
     contact
       "WG Web: <http://tools.ietf.org/wg/ccamp/>
        WG List: <mailto:ccamp@ietf.org>
        Editor: Jorge E. Lopez de Vergara
                <mailto:jorge.lopez_vergara@uam.es>
        Editor: Daniel Perdices
                <mailto:daniel.perdices@uam.es>
        Editor: Haomian Zheng
                <mailto:zhenghaomian@huawei.com>
        Editor: Daniel King
                <mailto:d.king@lancaster.ac.uk>
        Editor: Young Lee
                <mailto:younglee.tx@gmail.com>";

     description
       "This module provides a YANG data model for the routing and
        wavelength assignment (RWA) Traffic Engineering (TE)
        topology in flexi-grid optical networks. The YANG model
        described in this document is a flexi-grid technology-specific
        YANG model augmenting the generic TE topology module
        (ietf-te-topology, RFC 9795) based on the RFC 7698 and 7699.
        Copyright (c) 2020 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

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        (http://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 2020-02-22 {
       description
         "Initial Version";
       reference
         "RFC XXXX: A YANG Data Model for Flexi-Grid Optical Networks";
       // RFC Ed.: replace XXXX with actual RFC number, update date
       // information and remove this note
     }

     /*
      * Data nodes
      */

     augment "/nw:networks/nw:network/nw:network-types"
           + "/tet:te-topology" {
       description
         "Augment network types to define flexi-grid topology type.";
       container flexi-grid-topology {
         presence
           "Its presence identifies the flexi-grid topology type.";
         description
           "Introduce new network type for flexi-grid topology.";
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te"
           + "/tet:te-node-attributes" {
       when "/nw:networks/nw:network/nw:network-types"
          + "/tet:te-topology/flexgt:flexi-grid-topology" {
         description
         "Augmentation parameters apply only for networks with
          flexi-grid topology type.";
       }
       description "Augment TE node attributes.";
       container flexi-grid-node {
         presence "The TE node is a flexi-grid node.";
         description
           "Introduce new TE node type for flexi-grid node.";
       }
     }

     /*
      * Augment TE label range information

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      */

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:label-restrictions/tet:label-restriction" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range information for the TE node
          connectivity matrices.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/tet:from/"
           + "tet:label-restrictions/tet:label-restriction" {
       when "../../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range information for the source Link
          Termination Point (LTP) of the connectivity matrix entry.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/tet:to/"
           + "tet:label-restrictions/tet:label-restriction" {
       when "../../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range information for the destination LTP
          of the connectivity matrix entry.";
       uses l0-types:flexi-grid-label-range-info;
     }

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     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/"
           + "tet:connectivity-matrices/tet:label-restrictions/"
           + "tet:label-restriction" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range information for the TE node
          connectivity matrices information source.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:from/tet:label-restrictions/tet:label-restriction" {
       when "../../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range information for the source LTP
          of the connectivity matrix entry information source.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:to/tet:label-restrictions/tet:label-restriction" {
       when "../../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range information for the destination LTP
          of the connectivity matrix entry information source.";
       uses l0-types:flexi-grid-label-range-info;
     }

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     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:label-restrictions/tet:label-restriction" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range information for the Tunnel
         Termination Point (TTP) Local Link Connectivities.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/"
           + "tet:label-restrictions/tet:label-restriction" {
       when "../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range information for the TTP
          Local Link Connectivity entry.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:label-restrictions/tet:label-restriction" {
       when "../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range information for the TE link.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"

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           + "tet:information-source-entry/"
           + "tet:label-restrictions/tet:label-restriction" {
       when "../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range information for the TE link
          information source.";
       uses l0-types:flexi-grid-label-range-info;
     }

     augment "/nw:networks/tet:te/tet:templates/"
           + "tet:link-template/tet:te-link-attributes/"
           + "tet:label-restrictions/tet:label-restriction" {
       description
         "Augment TE label range information for the TE link template.";
       uses l0-types:flexi-grid-label-range-info;
     }

     /*
      * Augment TE label
      */

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-start/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range start for the TE node
          connectivity matrices.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:label-restrictions/"

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           + "tet:label-restriction/tet:label-end/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range end for the TE node
          connectivity matrices.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:label-restrictions/"
           + "tet:label-restriction/tet:label-step/"
           + "tet:technology" {
       when "../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range step for the TE node
          connectivity matrices.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:underlay/tet:primary-path/tet:path-element/"
           + "tet:type/tet:label/tet:label-hop/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description

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         "Augment TE label hop for the underlay primary path of the
          TE node connectivity matrices.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:underlay/tet:backup-path/tet:path-element/"
           + "tet:type/tet:label/tet:label-hop/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path of the
          TE node connectivity matrices.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"
           + "tet:explicit-route-exclude-objects/"
           + "tet:route-object-exclude-object/"
           + "tet:type/tet:label/tet:label-hop/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects excluded
          by the path computation of the TE node connectivity
          matrices.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;

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       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"
           + "tet:explicit-route-include-objects/"
           + "tet:route-object-include-object/"
           + "tet:type/tet:label/tet:label-hop/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects included
          by the path computation of the TE node connectivity
          matrices.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:path-properties/tet:path-route-objects/"
           + "tet:path-route-object/tet:type/tet:label/tet:label-hop/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the TE node connectivity matrices.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"

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           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/tet:from/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-start/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range start for the source LTP
          of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/tet:from/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-end/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range end for the source LTP
          of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/tet:from/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-step/"
           + "tet:technology" {
       when "../../../../../../../../../"

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          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range step for the source LTP
          of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/tet:to/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-start/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range start for the destination LTP
          of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/tet:to/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-end/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }

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       description
         "Augment TE label range end for the destination LTP
          of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/tet:to/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-step/"
           + "tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range step for the destination LTP
          of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:underlay/tet:primary-path/tet:path-element/"
           + "tet:type/tet:label/tet:label-hop/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }

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     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:underlay/tet:backup-path/tet:path-element/"
           + "tet:type/tet:label/tet:label-hop/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/tet:optimizations/"
           + "tet:algorithm/tet:metric/tet:optimization-metric/"
           + "tet:explicit-route-exclude-objects/"
           + "tet:route-object-exclude-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects excluded
          by the path computation of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/tet:optimizations/"

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           + "tet:algorithm/tet:metric/tet:optimization-metric/"
           + "tet:explicit-route-include-objects/"
           + "tet:route-object-include-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects included
          by the path computation of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:path-properties/tet:path-route-objects/"
           + "tet:path-route-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the connectivity matrix entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/"
           + "tet:connectivity-matrices/tet:label-restrictions/"
           + "tet:label-restriction/"
           + "tet:label-start/tet:te-label/tet:technology" {
       when "../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {

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         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range start for the TE node connectivity
          matrices information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/"
           + "tet:connectivity-matrices/tet:label-restrictions/"
           + "tet:label-restriction/"
           + "tet:label-end/tet:te-label/tet:technology" {
       when "../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range end for the TE node connectivity
          matrices information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/"
           + "tet:connectivity-matrices/tet:label-restrictions/"
           + "tet:label-restriction/"
           + "tet:label-step/tet:technology" {
       when "../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range step for the TE node connectivity
          matrices information source.";
       case flexi-grid {

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Internet-Draft               Flexi-Grid YANG                   July 2021

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

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the TE node connectivity matrices of the information
          source entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the TE node connectivity matrices of the information
          source entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"

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           + "tet:explicit-route-exclude-objects/"
           + "tet:route-object-exclude-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects excluded
          by the path computation of the TE node connectivity matrices
          information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"
           + "tet:explicit-route-include-objects/"
           + "tet:route-object-include-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects included
          by the path computation of the TE node connectivity matrices
          information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:path-properties/tet:path-route-objects/"
           + "tet:path-route-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../"

Lopez de Vergara, et al.Expires January 13, 2022               [Page 42]
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          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the TE node connectivity matrices information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:from/tet:label-restrictions/"
           + "tet:label-restriction/"
           + "tet:label-start/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range start for the source LTP
          of the connectivity matrix entry information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }
     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:from/tet:label-restrictions/"
           + "tet:label-restriction/"
           + "tet:label-end/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description

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         "Augment TE label range end for the source LTP
          of the connectivity matrix entry information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:from/tet:label-restrictions/"
           + "tet:label-restriction/"
           + "tet:label-step/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range step for the source LTP
          of the connectivity matrix entry information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:to/tet:label-restrictions/tet:label-restriction/"
           + "tet:label-start/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range start for the destination LTP
          of the connectivity matrix entry information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

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Internet-Draft               Flexi-Grid YANG                   July 2021

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:to/tet:label-restrictions/tet:label-restriction/"
           + "tet:label-end/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range end for the destination LTP
          of the connectivity matrix entry information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:to/tet:label-restrictions/tet:label-restriction/"
           + "tet:label-step/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range step for the destination LTP
          of the connectivity matrix entry information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {

Lopez de Vergara, et al.Expires January 13, 2022               [Page 45]
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         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the connectivity matrix entry information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the connectivity matrix entry information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"
           + "tet:explicit-route-exclude-objects/"
           + "tet:route-object-exclude-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description

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         "Augment TE label hop for the explicit route objects excluded
          by the path computation of the connectivity matrix entry
          information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"
           + "tet:explicit-route-include-objects/"
           + "tet:route-object-include-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects included
          by the path computation of the connectivity matrix entry
          information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:path-properties/tet:path-route-objects/"
           + "tet:path-route-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the connectivity matrix entry information source.";

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

     augment "/nw:networks/nw:network/nw:node/tet:te/"
         + "tet:tunnel-termination-point/"
         + "tet:local-link-connectivities/"
         + "tet:label-restrictions/tet:label-restriction/"
         + "tet:label-start/"
         + "tet:te-label/tet:technology" {
       when "../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range start for the TTP
          Local Link Connectivities.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-end/"
           + "tet:te-label/tet:technology"{
       when "../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range end for the TTP
          Local Link Connectivities.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"

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           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-step/"
           + "tet:technology"{
       when "../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range step for the TTP
          Local Link Connectivities.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the TTP Local Link Connectivities.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {

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         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the TTP Local Link Connectivities.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"
           + "tet:explicit-route-exclude-objects/"
           + "tet:route-object-exclude-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects excluded
          by the path computation of the TTP Local Link
          Connectivities.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"
           + "tet:explicit-route-include-objects/"
           + "tet:route-object-include-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description

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           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects included
          by the path computation of the TTP Local Link
          Connectivities.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:path-properties/tet:path-route-objects/"
           + "tet:path-route-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the TTP Local Link Connectivities.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-start/tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range start for the TTP

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          Local Link Connectivity entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-end/tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range end for the TTP
          Local Link Connectivity entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-step/tet:technology" {
       when "../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range step for the TTP
          Local Link Connectivity entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

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     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/"
           + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the TTP Local Link Connectivity entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/"
           + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the TTP Local Link Connectivity entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"

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           + "tet:explicit-route-exclude-objects/"
           + "tet:route-object-exclude-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects excluded
          by the path computation of the TTP Local Link
          Connectivity entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"
           + "tet:explicit-route-include-objects/"
           + "tet:route-object-include-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects included
          by the path computation of the TTP Local Link
          Connectivity entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/"

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           + "tet:path-properties/tet:path-route-objects/"
           + "tet:path-route-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the TTP Local Link Connectivity entry.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }
     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the TE link.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description

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         "Augment TE label hop for the underlay backup path
          of the TE link.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-start/tet:te-label/tet:technology" {
       when "../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range start for the TE link.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-end/tet:te-label/tet:technology" {
       when "../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range end for the TE link.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-step/tet:technology" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description

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           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range step for the TE link.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:information-source-entry/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-start/tet:te-label/tet:technology" {
       when "../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range start for the TE link
          information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:information-source-entry/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-end/tet:te-label/tet:technology" {
       when "../../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range end for the TE link
          information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:information-source-entry/"

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           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-step/tet:technology" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "flexgt:flexi-grid-topology" {
         description
           "Augmentation parameters apply only for networks with
            flexi-grid topology type.";
       }
       description
         "Augment TE label range step for the TE link
          information source.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }

     augment "/nw:networks/tet:te/tet:templates/"
           + "tet:link-template/tet:te-link-attributes/"
           + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       description
         "Augment TE label hop for the underlay primary path
          of the TE link template.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/tet:te/tet:templates/"
           + "tet:link-template/tet:te-link-attributes/"
           + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       description
         "Augment TE label hop for the underlay backup path
          of the TE link template.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-hop;
       }
     }

     augment "/nw:networks/tet:te/tet:templates/"
           + "tet:link-template/tet:te-link-attributes/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-start/tet:te-label/tet:technology" {
       description
         "Augment TE label range start for the TE link template.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;

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       }
     }

     augment "/nw:networks/tet:te/tet:templates/"
           + "tet:link-template/tet:te-link-attributes/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-end/tet:te-label/tet:technology" {
       description
         "Augment TE label range end for the TE link template.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-start-end;
       }
     }

     augment "/nw:networks/tet:te/tet:templates/"
           + "tet:link-template/tet:te-link-attributes/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-step/tet:technology" {
       description
         "Augment TE label range step for the TE link template.";
       case flexi-grid {
         uses l0-types:flexi-grid-label-step;
       }
     }
   }
   <CODE ENDS>

8.  Security Considerations

   The YANG module specified in this document defines a schema for data
   that is designed to be accessed via network management protocols such
   as NETCONF [RFC6241] or RESTCONF [RFC8040].  The lowest NETCONF layer
   is the secure transport layer, and the mandatory-to-implement secure
   transport is Secure Shell (SSH) [RFC6242].  The lowest RESTCONF layer
   is HTTPS, and the mandatory-to-implement secure transport is
   Transport Layer Security (TLS) [RFC8446].

   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.  The
   NETCONF Protocol SSH [RFC6242] describes a method for invoking and
   running NETCONF within a SSH session as an SSH subsystem.  The
   Network Configuration Access Control Model (NACM) [RFC8341] provides
   the means to restrict access for particular NETCONF or RESTCONF users
   to a preconfigured subset of all available NETCONF or RESTCONF
   protocol operations and content.

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   A number of configuration data nodes defined in this document are
   writable/deletable (i.e., "config true").  These data nodes may be
   considered sensitive or vulnerable in some network environments.

   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:

      /nw:networks/nw:network/nw:network-types/tet:te-topology

      /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes

      /nw:networks/nw:network/nw:node/nt:termination-point/tet:te

      /nw:networks/nw:network/nw:node/tet:te/tet:te-node-attributes
      /te-connectivity-matrices/te-connectivity-matrix/tet:path-
      constraints/tet:te-bandwidth/tet:technology

      /nw:networks/nw:network/nw:node/tet:te
      /tet:tunnel-termination-point/tet:local-link-connectivities
      /tet:label-restrictions/tet:label-restriction

9.  IANA Considerations

   IANA is requested to assigned a new URI from the "IETF XML Registry"
   [RFC3688] as follows:

         URI: urn:ietf:params:xml:ns:yang:ietf-flexi-grid-topology
         Registrant Contact: The IESG
         XML: N/A; the requested URI is an XML namespace.

   IANA is requested to assign a new YANG module name in the "YANG
   Module Names" registry [RFC6020] as follows:

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         Name: ietf-flexi-grid-topology
         Namespace: urn:ietf:params:xml:ns:yang:ietf-flexi-grid-topology
         Prefix: flexi-grid-topology
         Reference: [This.I-D]

10.  Contributors

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

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

   Gabriele Galimberti
   Cisco
   Email: ggalimbe@cisco.com

   Zafar Ali
   Cisco
   Email: zali@cisco.com

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

   Steven Hill,
   MTN Group Technology
   Email: Steven.Hill@mtn.com

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

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

   Aihua Guo
   Futurewei
   Email: aihuaguo.ietf@gmail.com

11.  Acknowledgments

   The work presented in this document has been partially funded by the
   European Commission under the project H2020 METRO-HAUL (Metro High

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   bandwidth, 5G Application-aware optical network, with edge storage,
   compUte and low Latency), Grant Agreement number: 761727.

   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).

   Thanks to Adrian Farrel for reviewing this document and assisting
   with conversion to XML.

12.  References

12.1.  Normative References

   [I-D.ietf-ccamp-layer0-types]
              Zheng, H., Lee, Y., Guo, A., Lopez, V., and D. King, "A
              YANG Data Model for Layer 0 Types", draft-ietf-ccamp-
              layer0-types-09 (work in progress), December 2020.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <https://www.rfc-editor.org/info/rfc3688>.

   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <https://www.rfc-editor.org/info/rfc6020>.

   [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>.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
              <https://www.rfc-editor.org/info/rfc6242>.

   [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>.

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   [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>.

   [RFC8342]  Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
              and R. Wilton, "Network Management Datastore Architecture
              (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
              <https://www.rfc-editor.org/info/rfc8342>.

   [RFC8345]  Clemm, A., Medved, J., Varga, R., Bahadur, N.,
              Ananthakrishnan, H., and X. Liu, "A YANG Data Model for
              Network Topologies", RFC 8345, DOI 10.17487/RFC8345, March
              2018, <https://www.rfc-editor.org/info/rfc8345>.

   [RFC8446]  Rescorla, E., "The Transport Layer Security (TLS) Protocol
              Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
              <https://www.rfc-editor.org/info/rfc8446>.

   [RFC8795]  Liu, X., Bryskin, I., Beeram, V., Saad, T., Shah, H., and
              O. Gonzalez de Dios, "YANG Data Model for Traffic
              Engineering (TE) Topologies", RFC 8795,
              DOI 10.17487/RFC8795, August 2020,
              <https://www.rfc-editor.org/info/rfc8795>.

12.2.  Informative References

   [G.694.1]  International Telecommunication Union, "Spectral grids for
              WDM applications: DWDM frequency grid", ITUT G.872,
              February 2012.

   [G.872]    International Telecommunication Union, "Architecture of
              optical transport networks", ITUT G.872, November 2010.

   [I-D.ietf-ccamp-flexigrid-media-channel-yang]
              Mendez, J. E. L. D. V., Burrero, D. P., King, D., Lopez,
              V., Busi, I., Dios, O. G. D., Lee, Y., and G. Galimberti,
              "A YANG Data Model for Flexi-Grid Media Channels", draft-
              ietf-ccamp-flexigrid-media-channel-yang-03 (work in
              progress), February 2021.

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   [I-D.ietf-ccamp-optical-impairment-topology-yang]
              Lee, Y., Auge, J., Lopez, V., Galimberti, G., and D.
              Beller, "A YANG Data Model for Optical Impairment-aware
              Topology", draft-ietf-ccamp-optical-impairment-topology-
              yang-06 (work in progress), February 2021.

   [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>.

   [RFC8340]  Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
              BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
              <https://www.rfc-editor.org/info/rfc8340>.

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

   Daniel King
   Old Dog Consulting

   Email: daniel@olddog.co.uk

   Young Lee
   Samsung

   Email: younglee.tx@gmail.co

   Haomian Zheng
   Huawei Technologies

   Email: zhenghaomian@huawei.com

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