Internet-Draft Flexi-Grid YANG July 2022
Lopez de Vergara, et al. Expires 11 January 2023 [Page]
Workgroup:
CCAMP Working Group
Internet-Draft:
draft-ietf-ccamp-flexigrid-yang-13
Published:
Intended Status:
Standards Track
Expires:
Authors:
J.E. Lopez de Vergara
Naudit HPCN
D. Perdices Burrero
Universidad Autonoma de Madrid
D. King
Old Dog Consulting
Y. Lee
Samsung
H. Zheng
Huawei Technologies

A YANG Data Model for Flexi-Grid Optical Networks

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 11 January 2023.

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Table of Contents

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 ITU-T_G.694.1 [ITU-T_G.694.1] and ITU-T_G.872 [ITU-T_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 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.

[RFC8363] provides extensions to the OSPF-TE protocol so as to support GMPLS control of 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 model is independent of control plane protocols.

This document identifies the flexi-grid components, parameters, and their values. It 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 [RFC9093].

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-tunnel-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:

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

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 [RFC9093], [RFC8345], and [RFC8795].


      +-------------+-------------------------+-----------------+
      | Prefix      | YANG module             | Reference       |
      +-------------+-------------------------+-----------------+
      | l0-types    | ietf-layer0-types       | [RFC9093]       |
      | flexgt      | ietf-flexi-grid-topology| RFC XXXX        |
      | nw          | ietf-network            | [RFC8345]       |
      | nt          | ietf-network-topology   | [RFC8345]       |
      | tet         | ietf-te-topology        | [RFC8795]       |
      +-------------+-------------------------+-----------------+
Figure 1: Prefixes and Corresponding YANG modules

Please replace XXXX 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 2 shows a simple topology.


   +----------+                                        +----------+
   |  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:

5. YANG Data Model for Flexi-Grid Topology

5.1. Flexi-Grid Topology Data Model Overview

This document describes the data model for flexi-grid topology. As a classic traffic engineering (TE) technology, flexi-grid provides WDM switching in transport network. Therefore the YANG module presented in this document augments from a more generic 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 [RFC9093] 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 a flexi-grid topology and the model presented in this document only specifies the technology- specific attributes/information.

The flexi-grid specific attributes and label format is defined in [RFC7699], including the grid type, channel spacing, slot width granularity, n and m parameters. A collection of common data types have also been specified in [RFC9093], 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. Augmentations for Flexi-Grid Topology and Node

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

Following the guidelines in [RFC8795], a flexi-grid-topology network-type is specified as the indicator of flexi-grid in the topology as shown in Figure 4.



       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 as shown in Figure 5.



       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

No bandwidth augmentations are needed for this YANG module.

As described in Section 4.2 of [RFC7699], there is some overlap between bandwidth and label in Layer 0.

The flexi-grid label resource information described in section 5.4, is sufficient to also describe 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 in [RFC8795] with flexi-grid technology specific attributes using the flexi-grid-label-range-info grouping defined in [RFC9093].

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 [RFC9093].

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
            /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
       +--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
            /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:
    +--:(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
            /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
            /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)
       +--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)
       +--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
            /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
            /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
            /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
            /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:
    +--:(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
  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
                +--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
  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)
       +--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@2022-07-04.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";
  }

  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 9093: A YANG Data Model for Layer 0 Types";
  }

  organization
     "IETF CCAMP Working Group";
  contact
    "WG Web: <https://datatracker.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 RFC 7698 and RFC 7699.

     Copyright (c) 2022 IETF Trust and the persons identified
     as authors of the code.  All rights reserved.

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

     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  revision 2022-07-04 {
    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
   */

  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;
  }
  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;
  }

  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/"
        + "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/"
        + "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
      "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;
    }
  }

  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/"
        + "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 "../../../../../../../../../"
       + "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.";
    }
    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;
    }
  }

  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/"
        + "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" {
      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 {
      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/"
        + "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 "../../../../../../../../../"
       + "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
      "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;
    }
  }

  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" {
      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
      "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.";
    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/"
        + "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" {
      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
        "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
       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;
    }
  }

  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/"
        + "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/"
        + "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
      "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
        "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/"
        + "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;
    }
  }

  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.

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:


      Name: ietf-flexi-grid-topology
      Namespace: urn:ietf:params:xml:ns:yang:ietf-flexi-grid-topology
      Prefix: flexgt
      Reference: RFC XXXX

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

Sergio Belotti Nokia Email: sergio.belotti@nokia.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 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

[RFC3688]
Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, , <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, , <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, , <https://www.rfc-editor.org/info/rfc6241>.
[RFC6242]
Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, , <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, , <https://www.rfc-editor.org/info/rfc7699>.
[RFC7950]
Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, , <https://www.rfc-editor.org/info/rfc7950>.
[RFC8040]
Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, , <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, , <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, , <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, , <https://www.rfc-editor.org/info/rfc8345>.
[RFC8363]
Zhang, X., Zheng, H., Casellas, R., Gonzalez de Dios, O., and D. Ceccarelli, "GMPLS OSPF-TE Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks", RFC 8363, DOI 10.17487/RFC8363, , <https://www.rfc-editor.org/info/rfc8363>.
[RFC8446]
Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, , <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, , <https://www.rfc-editor.org/info/rfc8795>.
[RFC9093]
Zheng, H., Lee, Y., Guo, A., Lopez, V., and D. King, "A YANG Data Model for Layer 0 Types", RFC 9093, DOI 10.17487/RFC9093, , <https://www.rfc-editor.org/info/rfc9093>.

12.2. Informative References

[I-D.ietf-ccamp-flexigrid-tunnel-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 Tunnels", Work in Progress, Internet-Draft, draft-ietf-ccamp-flexigrid-tunnel-yang-00, , <https://www.ietf.org/archive/id/draft-ietf-ccamp-flexigrid-tunnel-yang-00.txt>.
[I-D.ietf-ccamp-optical-impairment-topology-yang]
Beller, D., Rouzic, E. L., Belotti, S., Galimberti, G., and I. Busi, "A YANG Data Model for Optical Impairment-aware Topology", Work in Progress, Internet-Draft, draft-ietf-ccamp-optical-impairment-topology-yang-09, , <https://www.ietf.org/archive/id/draft-ietf-ccamp-optical-impairment-topology-yang-09.txt>.
[ITU-T_G.694.1]
International Telecommunication Union, "Spectral grids for WDM applications: DWDM frequency grid", ITU-T Recommendation G.694.1, .
[ITU-T_G.872]
International Telecommunication Union, "Architecture of optical transport networks", ITU-T Recommendation G.872, Amendment 1, .
[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, , <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, , <https://www.rfc-editor.org/info/rfc8340>.

Authors' Addresses

Jorge E. Lopez de Vergara Mendez
Naudit HPCN
Daniel Perdices Burrero
Universidad Autonoma de Madrid
Daniel King
Old Dog Consulting
Young Lee
Samsung
Haomian Zheng
Huawei Technologies