A YANG Data Model for Optical Transport Network Topology
draft-ietf-ccamp-otn-topo-yang-20

CCAMP Working Group                                             H. Zheng
Internet-Draft                                                   I. Busi
Intended status: Standards Track                     Huawei Technologies
Expires: 12 May 2025                                              X. Liu
                                                               Alef Edge
                                                              S. Belotti
                                                                   Nokia
                                                     O. Gonzalez de Dios
                                                              Telefonica
                                                         8 November 2024

        A YANG Data Model for Optical Transport Network Topology
                   draft-ietf-ccamp-otn-topo-yang-20

Abstract

   This document defines a YANG data model for representing, retrieving,
   and manipulating Optical Transport Network (OTN) topologies.  It is
   independent of control plane protocols and captures topological and
   resource-related information pertaining to OTN.

About This Document

   This note is to be removed before publishing as an RFC.

   The latest revision of this draft can be found at
   https://haomianzheng.github.io/ccamp-client-pm-yang/draft-zheng-
   ccamp-client-pm-yang.html.  Status information for this document may
   be found at https://datatracker.ietf.org/doc/draft-ietf-ccamp-otn-
   topo-yang/.

   Discussion of this document takes place on the Common Control and
   Measurement Plane Working Group mailing list (mailto:ccamp@ietf.org),
   which is archived at https://mailarchive.ietf.org/arch/browse/ccamp/.
   Subscribe at https://www.ietf.org/mailman/listinfo/ccamp/.

   Source for this draft and an issue tracker can be found at
   https://github.com/haomianzheng/ccamp-client-pm-yang.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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Copyright Notice

   Copyright (c) 2024 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
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   extracted from this document must include Revised BSD License text as
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   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology and Notations . . . . . . . . . . . . . . . .   4
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   5
     1.3.  Tree Diagram  . . . . . . . . . . . . . . . . . . . . . .   5
     1.4.  Prefix in Data Node Names . . . . . . . . . . . . . . . .   5
   2.  YANG Data Model for OTN Topology  . . . . . . . . . . . . . .   5
     2.1.  OTN Topology Data Model Overview  . . . . . . . . . . . .   6
     2.2.  Attributes Augmentation . . . . . . . . . . . . . . . . .   6
     2.3.  Bandwidth Augmentation  . . . . . . . . . . . . . . . . .   7
     2.4.  Label Augmentation  . . . . . . . . . . . . . . . . . . .   8
   3.  The YANG Model  . . . . . . . . . . . . . . . . . . . . . . .   8
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  55
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  55
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  60
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  60
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  62
   Appendix A.  YANG Tree  . . . . . . . . . . . . . . . . . . . . .  63
   Appendix B.  JSON Examples  . . . . . . . . . . . . . . . . . . .  83
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  91
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  91

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   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  92

1.  Introduction

   A transport network is a server-layer network designed to provide
   connectivity services for a client-layer network to carry the client
   traffic transparently across the server-layer network resources.  A
   transport network typically utilizes several different transport
   technologies such as the Optical Transport Networks (OTN) or packet
   transport such as provided by the MPLS-Transport Profile (MPLS-TP).

   This document defines a data model of an OTN topology, using YANG
   version 1.1 [RFC7950].  The model can be used by an application
   communicating with a transport controller.  Furthermore, it can be
   used by an application for the following purposes (but not limited
   to):

   *  To obtain a whole view of the network topology information of its
      interest;

   *  To receive notifications with regard to the information change of
      the OTN topology;

   *  To enforce the establishment and update to the network topology
      with the characteristics specified in the data model;

   The YANG model defined in this document is independent of control
   plane protocols and captures topology-related information pertaining
   to OTN electrical layer, as the scope specified by [RFC7062] .
   Furthermore, it is not a stand-alone model, but augments from the TE
   topology YANG model defined in [RFC8795], and importing from the
   generic Layer 1 types defined in [I-D.ietf-ccamp-layer1-types].
   Following TE topology YANG model, the YANG model defined in this
   document is interface independent.  The model is included in
   [I-D.ietf-teas-actn-yang], which indicates the typical usage of IETF
   YANG models in ACTN architecture specified by [RFC8453].  More
   specifically, the usage of this model between controllers is
   described in [I-D.ietf-ccamp-transport-nbi-app-statement].

   This model supports both client-configured and system-controlled OTN
   topologies, as described [RFC8345].  These OTN topologies can be used
   as overlay or underlay topologies, using the mechanisms defined in
   [RFC8345] and [RFC8795].

   The reader of this document is assumed to be familiar with the OTN
   technology, as specified in [ITU-T_G.709] and with the TE topology
   YANG data model, as defined in [RFC8795].

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   [RFC7062] also provides a framework to allow the development of
   protocol extensions to support GMPLS and Path Computation Element
   (PCE) control of OTN.

   Section 6 of [RFC8795] provides guidelines for writing technology-
   specific TE topology augmentations.

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

1.1.  Terminology and Notations

   Some of the key terms used in this document are listed as follows.

   TS:  Tributary Slot.

   TSG:  Tributary Slot Granularity.

   TPN:  Tributary Port Number.

   Refer to [RFC7062] for the key terms used in this document.

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

   *  client

   *  server

   *  augment

   *  data model

   *  data node

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

   *  configuration data

   *  state data

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

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1.2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

1.3.  Tree Diagram

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

1.4.  Prefix in Data Node Names

   In this document, the 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 Table 1.

             +==========+=======================+===========+
             | Prefix   | YANG module           | Reference |
             +==========+=======================+===========+
             | l1-types | ietf-layer1-types     | [RFCYYYY] |
             +----------+-----------------------+-----------+
             | otnt     | ietf-otn-topology     | RFC XXXX  |
             +----------+-----------------------+-----------+
             | nw       | ietf-network          | [RFC8345] |
             +----------+-----------------------+-----------+
             | nt       | ietf-network-topology | [RFC8345] |
             +----------+-----------------------+-----------+
             | tet      | ietf-te-topology      | [RFC8795] |
             +----------+-----------------------+-----------+

             Table 1: Prefixes and corresponding YANG modules

      RFC Editor Note: Please replace XXXX with the number assigned to
      the RFC once this draft becomes an RFC.  Please replace YYYY with
      the RFC numbers assigned to [I-D.ietf-ccamp-layer1-types].

2.  YANG Data Model for OTN Topology

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2.1.  OTN Topology Data Model Overview

   This document aims to describe the data model for OTN topology.  As a
   classic Traffic-engineering (TE) technology, OTN provides TDM
   switching in transport network [ITU-T_G.709].  Therefore, the YANG
   module presented in this document augments from a more generic
   Traffic Engineered (TE) network topology data model, i.e., the ietf-
   te-topology, as specified in [RFC8795].  In Section 6 of [RFC8795],
   the guideline for augmenting TE topology model was provided, and in
   this draft, we augment the TE topology model to describe the topology
   in OTN.  Common types, identities and groupings defined in
   [I-D.ietf-ccamp-layer1-types] is reused in this document.  [RFC8345]
   describes a network topology model and provides the fundamental model
   for [RFC8795].  However, this work is not directly augmenting
   [RFC8345].  Figure 1 shows the augmentation relationship.

                           +------------------+
              TE generic   | ietf-te-topology |
                           +------------------+
                                     ^
                                     |
                                     | Augments
                                     |
                           +---------+---------+
              OTN          | ietf-otn-topology |
                           +-------------------+

         Figure 1: Relationship between OTN and TE topology models

   The entities and TE attributes, such as node, termination points and
   links, are still applicable for describing an OTN topology and the
   model presented in this document only specifies technology-specific
   attributes/information.  The OTN-specific attributes in [RFC7139],
   including the TPN, TS and TSG, can be used to represent the bandwidth
   and label information.  These attributes have been specified in
   [I-D.ietf-ccamp-layer1-types], and used in this document for
   augmentation of the generic TE topology model.

2.2.  Attributes Augmentation

   There are a few characteristics augmenting the generic TE topology.

   Following the guidelines described in [RFC8795], an otn-topology
   network-type is specified as the indicator of OTN in the topology.

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

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   Three OTN technology-specific parameters that augment the generic TE
   link attributes are specified.

         augment /nw:networks/nw:network/nt:link/tet:te
                   /tet:te-link-attributes:
           +--rw otn-link
             +--rw odtu-flex-type?   l1-types:odtu-flex-type
             +--rw tsg?              identityref
             +--rw distance?         uint32

   In OTN the resources is measured by the tributary slots (TS), as
   specified in [RFC7139].  The tributary slot granularity (TSG)
   attribute defines the granularity, such as 1.25G, 2.5G and 5G, used
   by the TSs of a given OTN link.  The distance attribute describes the
   geographical distance between a pair of OTN link termination points.
   This is usually measured by the length of the fibre.

   The OTN topology model also includes information about the access
   links that support the transparent client signals, defined in
   [I-D.ietf-ccamp-layer1-types].  These links can also be multi-
   function access links that can support one or more transparent client
   signals and OTN.

   A client-svc presence container is specified to augment the generic
   TE link termination point to describe if the point is capable of
   carrying a client signal and what kind of signal can be carried as
   follows.  The same presence container is also specified for the TE
   link.

         augment /nw:networks/nw:network/nw:node/nt:termination-point
                   /tet:te:
           +--rw client-svc!
               +--rw supported-client-signal*   identityref

   The list of supported-client-signal is used to provide the
   capabilities of the client signal specified in
   [I-D.ietf-ccamp-layer1-types].

2.3.  Bandwidth Augmentation

   Following the guidelines in [RFC8795], the model augments all the
   occurrences of the te-bandwidth container with the OTN technology-
   specific attributes using the otn-link-bandwidth and otn-path-
   bandwidth groupings defined in [I-D.ietf-ccamp-layer1-types].

   The odtu-flex-type attribute of a given OTN Link (or Link Termination
   Point - LTP), shown in Section 2.2, is used, together with the OTN
   technology-specific attributes defined in the otn-link-bandwidth and

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   otn-path-bandwidth groupings, to compute the number of Tributary
   Slots (TS) required by the ODUflex LSPs set up on that OTN Link (or
   LTP).

   In order to compute the number of Tributary Slots (TS) required by
   the ODUflex LSPs set up on an underlay path (e.g., the underlay path
   of a connectivity matrix entry), the odtu-flex-type attribute is
   added to the OTN technology-specific attributes defined in the otn-
   link-bandwidth and otn-path-bandwidth groupings.

2.4.  Label Augmentation

   The model augments all the occurrences of the label-restriction list
   with OTN technology specific attributes using the otn-label-range-
   info grouping defined in [I-D.ietf-ccamp-layer1-types].

   Moreover, following the guidelines in [RFC8795], the model augments
   all the occurrences of the te-label container with the OTN technology
   specific attributes using the otn-label-start-end, otn-label-hop and
   otn-label-step groupings defined in [I-D.ietf-ccamp-layer1-types].

3.  The YANG Model

   This YANG module references [RFC8345], [RFC8795],
   [I-D.ietf-ccamp-layer1-types] and [ITU-T_G.709].

   <CODE BEGINS> file "ietf-otn-topology@2024-06-21.yang"
   module ietf-otn-topology {
     yang-version 1.1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-otn-topology";
     prefix "otnt";

     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

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          (TE) Topologies";
     }

     import ietf-layer1-types {
       prefix "l1-types";
       reference
         "RFC YYYY: A YANG Data Model for Layer 1 Types";
     }
     // RFC Editor: replace YYYY with actual RFC number assigned to
     // [I-D.ietf-ccamp-layer1-types] and remove this note

     organization
       "IETF CCAMP Working Group";
     contact
       "WG Web: <https://datatracker.ietf.org/wg/ccamp/>
        WG List: <mailto:ccamp@ietf.org>

        Editor: Haomian Zheng
                <mailto:zhenghaomian@huawei.com>

        Editor: Italo Busi
                <mailto:italo.busi@huawei.com>

        Editor: Xufeng Liu
                <mailto:xufeng.liu.ietf@gmail.com>

        Editor: Sergio Belotti
                <mailto:sergio.belotti@nokia.com>

        Editor: Oscar Gonzalez de Dios
                <mailto:oscar.gonzalezdedios@telefonica.com>";

     description
       "This module defines a protocol independent Layer 1/ODU topology
        data model. The model fully conforms
        to the Network Management Datastore Architecture (NMDA).

        Copyright (c) 2024 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

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        the RFC itself for full legal notices.

        The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
        NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
        'MAY', and 'OPTIONAL' in this document are to be interpreted as
        described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
        they appear in all capitals, as shown here.";

     revision 2024-06-21 {
       description
         "Initial Revision";
       reference
         "RFC XXXX: A YANG Data Model for Optical Transport Network
         Topology";
     }
     // RFC Editor: replace XXXX with actual RFC number, update date
     // information and remove this note

     /*
      * Groupings
      */

     grouping label-range-info {
       description
         "OTN technology-specific label range related information with
         a presence container indicating that the label range is an
         OTN technology-specific label range.

         This grouping SHOULD be used together with the
         otn-label-start-end and otn-label-step groupings to provide
         OTN technology-specific label information to the models which
         use the label-restriction-info grouping defined in the module
         ietf-te-types.";
       uses l1-types:otn-label-range-info {
         refine otn-label-range {
           presence
             "Indicates the label range is an OTN label range.

             This container MUST NOT be present if there are other
             presence containers or attributes indicating another type
             of label range.";
         }
       }
     }

    /*
     * Data nodes
     */

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     augment "/nw:networks/nw:network/nw:network-types/"
           + "tet:te-topology" {
       container otn-topology {
         presence "indicates a topology type of Optical Transport
                   Network (OTN)-electrical layer.";
         description "OTN topology type";
       }
       description "augment network types to include OTN.";
     }

     augment "/nw:networks/nw:network/nw:node/tet:te"
           + "/tet:te-node-attributes" {
       when "../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description "Augment only for OTN.";
       }
       description "Augment TE node attributes.";
       container otn-node {
         presence "The TE node is an OTN node.";
         description
           "Introduce new TE node type for OTN node.";
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes" {
       when "../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description "Augment only for OTN.";
       }
       description "Augment link configuration";

       container otn-link {
         description
           "Attributes of the OTN Link.";
         leaf odtu-flex-type {
           type l1-types:odtu-flex-type;
           description
             "The type of Optical Data Tributary Unit (ODTU)
             whose nominal bitrate is used to compute the number of
             Tributary Slots (TS) required by the ODUflex LSPs set up
             on this OTN Link.";
         }
         leaf tsg {
           type identityref {
             base l1-types:tributary-slot-granularity;
           }
           description "Tributary slot granularity.";

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           reference
             "ITU-T G.709 v6.0 (06/2020): Interfaces for the Optical
             Transport Network (OTN)";
         }
         leaf distance {
           type uint32;
           description "distance in the unit of kilometers";
         }
       }
       container client-svc {
         presence
           "When present, indicates that the Link supports Constant
           Bit Rate (CBR) client signals.";
         description
           "Attributes of the Link supporting CBR client signals.";
         leaf-list supported-client-signal {
           type identityref {
             base l1-types:client-signal;
           }
           min-elements 1;
           description
             "List of client signal types supported by the Link.";
         }
       }
     }

     augment "/nw:networks/nw:network/nw:node/nt:termination-point/"
           + "tet:te" {
       when "../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description "Augment only for OTN.";
       }
       description
         "Augment link termination point (LTP) configuration.";

       container otn-link-tp {
         description
           "Attributes of the OTN Link Termination Point (LTP).";
         leaf odtu-flex-type {
           type l1-types:odtu-flex-type;
           description
             "The type of Optical Data Tributary Unit (ODTU)
             whose nominal bitrate is used to compute the number of
             Tributary Slots (TS) required by the ODUflex LSPs set up
             on this OTN Link Termination Point (LTP).";
         }
       }
       container client-svc {

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         presence
           "When present, indicates that the Link Termination Point
           (LTP) supports Constant Bit Rate (CBR) client signals.";
         description
           "OTN LTP Service attributes.";
         leaf-list supported-client-signal {
           type identityref {
             base l1-types:client-signal;
           }
           description
             "List of client signal types supported by the LTP.";
         }
       }
     }

     /*
      * Augment TE bandwidth
      */

     augment "/nw:networks/nw:network/nw:node/nt:termination-point/"
           + "tet:te/"
           + "tet:interface-switching-capability/tet:max-lsp-bandwidth/"
           + "tet:te-bandwidth/tet:technology" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment maximum LSP TE bandwidth for the link termination
          point (LTP).";
       case otn {
         uses l1-types:otn-max-path-bandwidth {
           description
             "The odtu-flex-type attribute of the OTN Link Termination
             Point (LTP) is used to compute the number of Tributary
             Slots (TS) required by the ODUflex LSPs set up on this
             OTN LTP.";
         }
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:path-constraints/tet:te-bandwidth/tet:technology" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {

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         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE bandwidth path constraints of the TE node
          connectivity matrices.";
       case otn {
         uses l1-types:otn-link-bandwidth {
           augment otn-bandwidth {
             description
               "Augment OTN link bandwidth information.";
             leaf odtu-flex-type {
               type l1-types:odtu-flex-type;
               description
                 "The type of Optical Data Tributary Unit (ODTU)
                 whose nominal bitrate is used to compute the number of
                 Tributary Slots (TS) required by the ODUflex LSPs
                 set up along the underlay paths of these OTN
                 connectivity matrices.";
             }
           }
         }
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:path-constraints/tet:te-bandwidth/tet:technology" {
       when "../../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE bandwidth path constraints of the
          connectivity matrix entry.";
       case otn {
         uses l1-types:otn-link-bandwidth {
           augment otn-bandwidth {
             description
               "Augment OTN link bandwidth information.";
             leaf odtu-flex-type {
               type l1-types:odtu-flex-type;
               description
                 "The type of Optical Data Tributary Unit (ODTU)

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                 whose nominal bitrate is used to compute the number of
                 Tributary Slots (TS) required by the ODUflex LSPs
                 set up along the underlay path of this OTN
                 connectivity matrix entry.";
             }
           }
         }
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:path-constraints/tet:te-bandwidth/tet:technology" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE bandwidth path constraints of the TE node
          connectivity matrices information source.";
       case otn {
         uses l1-types:otn-link-bandwidth {
           augment otn-bandwidth {
             description
               "Augment OTN link bandwidth information.";
             leaf odtu-flex-type {
               type l1-types:odtu-flex-type;
               description
                 "The type of Optical Data Tributary Unit (ODTU)
                 whose nominal bitrate is used to compute the number of
                 Tributary Slots (TS) required by the ODUflex LSPs
                 set up along the underlay paths of these OTN
                 connectivity matrices.";
             }
           }
         }
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:information-source-entry/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:path-constraints/tet:te-bandwidth/tet:technology" {
       when "../../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description

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           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE bandwidth path constraints of the
          connectivity matrix entry information source";
       case otn {
         uses l1-types:otn-link-bandwidth {
           augment otn-bandwidth {
             description
               "Augment OTN link bandwidth information.";
             leaf odtu-flex-type {
               type l1-types:odtu-flex-type;
               description
                 "The type of Optical Data Tributary Unit (ODTU)
                 whose nominal bitrate is used to compute the number of
                 Tributary Slots (TS) required by the ODUflex LSPs
                 set up along the underlay path of this OTN
                 connectivity matrix entry.";
             }
           }
         }
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:client-layer-adaptation/tet:switching-capability/"
           + "tet:te-bandwidth/tet:technology" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment client TE bandwidth of the tunnel termination point
          (TTP)";
       case otn {
         uses l1-types:otn-link-bandwidth {
           augment otn-bandwidth {
             description
               "Augment OTN link bandwidth information.";
             leaf odtu-flex-type {
               type l1-types:odtu-flex-type;
               description
                 "The type of Optical Data Tributary Unit (ODTU)
                 whose nominal bitrate is used to compute the number of

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                 Tributary Slots (TS) required by the ODUflex LSPs
                 terminated on this OTN Tunnel Termination Point
                 (TTP).";
             }
           }
         }
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/tet:path-constraints/"
           + "tet:te-bandwidth/tet:technology" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE bandwidth path constraints for the TTP
          Local Link Connectivities.";
       case otn {
         uses l1-types:otn-link-bandwidth {
           augment otn-bandwidth {
             description
               "Augment OTN link bandwidth information.";
             leaf odtu-flex-type {
               type l1-types:odtu-flex-type;
               description
                 "The type of Optical Data Tributary Unit (ODTU)
                 whose nominal bitrate is used to compute the number of
                 Tributary Slots (TS) required by the ODUflex LSPs
                 set up along the underlay paths of these OTN Local
                 Link Connectivities.";
             }
           }
         }
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/tet:path-constraints/"
           + "tet:te-bandwidth/tet:technology" {
       when "../../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {

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         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE bandwidth path constraints for the TTP
          Local Link Connectivity entry.";
       case otn {
         uses l1-types:otn-link-bandwidth {
           augment otn-bandwidth {
             description
               "Augment OTN link bandwidth information.";
             leaf odtu-flex-type {
               type l1-types:odtu-flex-type;
               description
                 "The type of Optical Data Tributary Unit (ODTU)
                 whose nominal bitrate is used to compute the number of
                 Tributary Slots (TS) required by the ODUflex LSPs
                 set up along the underlay path of this OTN Local
                 Link Connectivity entry.";
             }
           }
         }
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:interface-switching-capability/tet:max-lsp-bandwidth/"
           + "tet:te-bandwidth/tet:technology" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment maximum LSP TE bandwidth for the TE link.";
       case otn {
         uses l1-types:otn-max-path-bandwidth {
           description
             "The odtu-flex-type attribute of the OTN Link is used
             to compute the number of Tributary Slots (TS) required
             by the ODUflex LSPs set up on this OTN Link.";
         }
       }
     }

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     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:max-link-bandwidth/"
           + "tet:te-bandwidth" {
       when "../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment maximum TE bandwidth for the TE link";
       uses l1-types:otn-link-bandwidth {
         description
           "The odtu-flex-type attribute of the OTN Link is used
           to compute the number of Tributary Slots (TS) required
           by the ODUflex LSPs set up on this OTN Link.";
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:max-resv-link-bandwidth/"
           + "tet:te-bandwidth" {
       when "../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment maximum reservable TE bandwidth for the TE link";
       uses l1-types:otn-link-bandwidth {
         description
           "The odtu-flex-type attribute of the OTN Link is used
           to compute the number of Tributary Slots (TS) required
           by the ODUflex LSPs set up on this OTN Link.";
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:unreserved-bandwidth/"
           + "tet:te-bandwidth" {
       when "../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with

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            OTN topology type.";
       }
       description
         "Augment unreserved TE bandwidth for the TE Link";
       uses l1-types:otn-link-bandwidth {
         description
           "The odtu-flex-type attribute of the OTN Link is used
           to compute the number of Tributary Slots (TS) required
           by the ODUflex LSPs set up on this OTN Link.";
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:information-source-entry/"
           + "tet:interface-switching-capability/"
           + "tet:max-lsp-bandwidth/"
           + "tet:te-bandwidth/tet:technology" {
       when "../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment maximum LSP TE bandwidth for the TE link
          information source";
       case otn {
         uses l1-types:otn-max-path-bandwidth {
           description
             "The odtu-flex-type attribute of the OTN Link is used
             to compute the number of Tributary Slots (TS) required
             by the ODUflex LSPs set up on this OTN Link.";
         }
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:information-source-entry/"
           + "tet:max-link-bandwidth/"
           + "tet:te-bandwidth" {
       when "../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment maximum TE bandwidth for the TE link

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          information source";
       uses l1-types:otn-link-bandwidth {
         description
           "The odtu-flex-type attribute of the OTN Link is used
           to compute the number of Tributary Slots (TS) required
           by the ODUflex LSPs set up on this OTN Link.";
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:information-source-entry/"
           + "tet:max-resv-link-bandwidth/"
           + "tet:te-bandwidth" {
       when "../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment maximum reservable TE bandwidth for the TE link
          information-source";
       uses l1-types:otn-link-bandwidth {
         description
           "The odtu-flex-type attribute of the OTN Link is used
           to compute the number of Tributary Slots (TS) required
           by the ODUflex LSPs set up on this OTN Link.";
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:information-source-entry/"
           + "tet:unreserved-bandwidth/"
           + "tet:te-bandwidth" {
       when "../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment unreserved TE bandwidth of the TE link
          information source";
       uses l1-types:otn-link-bandwidth {
         description
           "The odtu-flex-type attribute of the OTN Link is used
           to compute the number of Tributary Slots (TS) required
           by the ODUflex LSPs set up on this OTN Link.";

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       }
     }

     augment "/nw:networks/tet:te/tet:templates/"
           + "tet:link-template/tet:te-link-attributes/"
           + "tet:interface-switching-capability/"
           + "tet:max-lsp-bandwidth/"
           + "tet:te-bandwidth/tet:technology" {
       description
         "Augment maximum LSP TE bandwidth of the TE link
          template";
       case otn {
         uses l1-types:otn-max-path-bandwidth {
           description
             "The odtu-flex-type attribute of the OTN Link is used
             to compute the number of Tributary Slots (TS) required
             by the ODUflex LSPs set up on the OTN Link that uses this
             Link Template.";
         }
       }
     }

     augment "/nw:networks/tet:te/tet:templates/"
           + "tet:link-template/tet:te-link-attributes/"
           + "tet:max-link-bandwidth/"
           + "tet:te-bandwidth" {
       description
         "Augment maximum TE bandwidth the TE link template";
       uses l1-types:otn-link-bandwidth {
         description
           "The odtu-flex-type attribute of the OTN Link is used
           to compute the number of Tributary Slots (TS) required
           by the ODUflex LSPs set up on the OTN Link that uses this
           Link Template.";
       }
     }

     augment "/nw:networks/tet:te/tet:templates/"
           + "tet:link-template/tet:te-link-attributes/"
           + "tet:max-resv-link-bandwidth/"
           + "tet:te-bandwidth" {
       description
         "Augment maximum reservable TE bandwidth for the TE link
          template.";
       uses l1-types:otn-link-bandwidth {
         description
           "The odtu-flex-type attribute of the OTN Link is used
           to compute the number of Tributary Slots (TS) required

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           by the ODUflex LSPs set up on the OTN Link that uses this
           Link Template.";
       }
     }

     augment "/nw:networks/tet:te/tet:templates/"
           + "tet:link-template/tet:te-link-attributes/"
           + "tet:unreserved-bandwidth/"
           + "tet:te-bandwidth" {
       description
         "Augment unreserved TE bandwidth the TE link template";
       uses l1-types:otn-link-bandwidth {
         description
           "The odtu-flex-type attribute of the OTN Link is used
           to compute the number of Tributary Slots (TS) required
           by the ODUflex LSPs set up on the OTN Link that uses this
           Link Template.";
       }
     }

     /*
      * 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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range information for the TE node
          connectivity matrices.";
       uses 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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";

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       }
       description
         "Augment TE label range information for the source LTP
          of the connectivity matrix entry.";
       uses 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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range information for the destination LTP
          of the connectivity matrix entry.";
       uses 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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range information for the TE node
          connectivity matrices information source.";
       uses 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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";

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       }
       description
         "Augment TE label range information for the source LTP
          of the connectivity matrix entry information source.";
       uses 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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range information for the destination LTP
          of the connectivity matrix entry information source.";
       uses 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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range information for the TTP
          Local Link Connectivities.";
       uses 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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with

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            OTN topology type.";
       }
       description
         "Augment TE label range information for the TTP
          Local Link Connectivity entry.";
       uses 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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range information for the TE link.";
       uses 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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range information for the TE link
          information source.";
       uses 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 label-range-info;
     }

     /*
      * Augment TE label
      */

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     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-start/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range start for the TE node
          connectivity matrices";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range end for the TE node
          connectivity matrices";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";

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       }
       description
         "Augment TE label range step for the TE node
          connectivity matrices";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path of the
          TE node connectivity matrices";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path of the
          TE node connectivity matrices";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

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     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:optimizations/tet:algorithm/tet:metric/"
           + "tet:optimization-metric/"
           + "tet:explicit-route-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects excluded
          by the path computation of the TE node connectivity
          matrices";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects included
          by the path computation of the TE node connectivity
          matrices";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

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     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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the TE node connectivity matrices";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range start for the source LTP
          of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-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 "../../../../../../../../../../"

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          + "nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range end for the source LTP
          of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range step for the source LTP
          of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }

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       description
         "Augment TE label range start for the destination LTP
          of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range end for the destination LTP
          of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range step for the destination LTP
          of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-label-step;
       }

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     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:te-node-attributes/tet:connectivity-matrices/"
           + "tet:connectivity-matrix/"
           + "tet:underlay/tet:primary-path/tet:path-element/"
           + "tet:type/tet:label/tet:label-hop/"
           + "tet:te-label/tet:technology" {
       when "../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-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/"

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           + "tet:explicit-route-exclude-objects/"
           + "tet:route-object-exclude-object/tet:type/"
           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects excluded
          by the path computation of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects included
          by the path computation of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-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/"

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          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the connectivity matrix entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range start for the TE node connectivity
          matrices information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range end for the TE node connectivity
          matrices information source.";

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       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range step for the TE node connectivity
          matrices information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the TE node connectivity matrices of the information
          source entry.";
       case otn {
         uses l1-types:otn-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/"

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           + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
       when "../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the TE node connectivity matrices of the information
          source entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN 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 otn {
         uses l1-types:otn-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 "../../../../../../../../../../"

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          + "nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN 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 otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the TE node connectivity matrices information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }

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       description
         "Augment TE label range start for the source LTP
          of the connectivity matrix entry information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range end for the source LTP
          of the connectivity matrix entry information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range step for the source LTP
          of the connectivity matrix entry information source.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

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     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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range start for the destination LTP
          of the connectivity matrix entry information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range end for the destination LTP
          of the connectivity matrix entry information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {

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         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range step for the destination LTP
          of the connectivity matrix entry information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the connectivity matrix entry information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the connectivity matrix entry information source.";
       case otn {

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         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN 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 otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN 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 otn {

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         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the connectivity matrix entry information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range start for the TTP
          Local Link Connectivities.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te/"
           + "tet:tunnel-termination-point/"

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           + "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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range end for the TTP
          Local Link Connectivities.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range step for the TTP
          Local Link Connectivities.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {

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         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the TTP Local Link Connectivities.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the TTP Local Link Connectivities.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description

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         "Augment TE label hop for the explicit route objects excluded
          by the path computation of the TTP Local Link
          Connectivities.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the explicit route objects included
          by the path computation of the TTP Local Link
          Connectivities.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the TTP Local Link Connectivities.";

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       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range start for the TTP
          Local Link Connectivity entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range end for the TTP
          Local Link Connectivity entry.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

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

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           + "tet:tunnel-termination-point/"
           + "tet:local-link-connectivities/"
           + "tet:local-link-connectivity/"
           + "tet:label-restrictions/tet:label-restriction/"
           + "tet:label-step/tet:technology" {
       when "../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range step for the TTP
          Local Link Connectivity entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay primary path
          of the TTP Local Link Connectivity entry.";
       case otn {
         uses l1-types:otn-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 "../../../../../../../../../../"

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          + "nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the TTP Local Link Connectivity entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN 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 otn {
         uses l1-types:otn-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" {

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       when "../../../../../../../../../../../"
          + "nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN 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 otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the computed path route objects
          of the TTP Local Link Connectivity entry.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }

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       description
         "Augment TE label hop for the underlay primary path
          of the TE link.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label hop for the underlay backup path
          of the TE link.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range start for the TE link.";
       case otn {
         uses l1-types:otn-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" {

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       when "../../../../../../../nw:network-types/tet:te-topology/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range end for the TE link.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range step for the TE link.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range start for the TE link
          information source.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

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     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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range end for the TE link
          information source.";
       case otn {
         uses l1-types:otn-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/"
          + "otnt:otn-topology" {
         description
           "Augmentation parameters apply only for networks with
            OTN topology type.";
       }
       description
         "Augment TE label range step for the TE link
          information source.";
       case otn {
         uses l1-types:otn-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 otn {
         uses l1-types:otn-label-hop;
       }
     }

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     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 otn {
         uses l1-types:otn-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 otn {
         uses l1-types:otn-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 otn {
         uses l1-types:otn-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 otn {
         uses l1-types:otn-label-step;
       }
     }
   }
   <CODE ENDS>

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4.  IANA Considerations

   It is proposed to IANA to assign new URIs from the "IETF XML
   Registry" [RFC3688] as follows:

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

   This document registers a YANG module in the YANG Module Names
   registry [RFC7950].

         name:         ietf-otn-topology
         namespace:    urn:ietf:params:xml:ns:yang:ietf-otn-topology
         prefix:       otnt
         reference:    RFC XXXX

      RFC Editor Note: Please replace XXXX with the number assigned to
      the RFC once this draft becomes an RFC.

5.  Security Considerations

   This section is modeled after the template described in Section 3.7
   of [I-D.ietf-netmod-rfc8407bis].

   The "ietf-te-types" and the "ietf-te-packet-types" YANG modules
   define data models that are designed to be accessed via YANG-based
   management protocols, such as NETCONF [RFC6241] and RESTCONF
   [RFC8040].  These protocols have to use a secure transport layer
   (e.g., SSH [RFC4252], TLS [RFC8446], and QUIC [RFC9000]) and have to
   use mutual authentication.

   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.

   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 can 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.  Specifically, the following subtrees
   and data nodes have particular sensitivities/vulnerabilities:

   *  "/nw:networks/nw:network/nw:network-types/tet:te-topology/
      otnt:otn-topology"

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      This subtree specifies the OTN topology type.  Modifying the
      configurations can render the OTN topology type invalid.  By
      making such modifications, a malicious attacker may disable the
      OTN capabilities on the related networks and cause traffic to be
      disrupted or misrouted.

   *  "/nw:networks/nw:network/nw:node/tet:te/tet:te-node-attributes/
      otnt:otn-node"

      This subtree specifies the OTN node type.  By configuring the OTN
      node type, an attacker may create an unauthorized OTN traffic
      path.  By removing it, a malicious attacker may cause OTN traffic
      to be disabled or misrouted.  Such traffic changes may also affect
      the traffic on the surrounding OTN nodes and OTN links in this OTN
      topology and the connected OTN topologies.

   *  "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      otnt:otn-link/otnt:odtu-flex-type"

      This node is used, together with the other attributes in the otn-
      bandwidth container, to compute the OTN bandwidth information for
      an OTN link, as described in Section 2.3.  By configuring,
      modifying or removing this data node, a malicious attacker may
      modify the OTN bandwidth.  The consequences of modifying the OTN
      bandwidth are reported below for the otn-bandwidth container.

   *  "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      otnt:otn-link/otnt:tsg"

      This node represents the TSG of the OTN link, as described in
      Section 2.2.  By configuring, modifying or removing this data
      node, a malicious attacker may modify the resouces assigned to the
      OTN LSPs setup over that OTN link.  The consequences of modifying
      the TSG would be to disrupt the traffic carried by the OTN LSPs
      setup over that OTN link.

   *  "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      otnt:otn-link/otnt:distance"

      This node is describes the geographical distance between a pair of
      OTN link termination points.  By configuring, modifying or
      removing the distance, an attacker may cause OTN traffic to be
      misrouted.  Such traffic changes may also affect the traffic on
      the surrounding OTN nodes and OTN links in this OTN topology and
      the connected OTN topologies.

   *  "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      otnt:client-svc"

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      This subtree specifies the client traffic type supported by a
      link.  By configuring it, an attacker may create an unauthorized
      client traffic path.  By removing it, a malicious attacker may
      cause client traffic to be disabled or misrouted.  Such traffic
      changes may also affect the traffic on the surrounding OTN nodes
      and OTN links in this OTN topology and the connected OTN
      topologies.

   *  "/nw:networks/nw:network/nw:node/nt:termination-point/tet:te/
      otnt:otn-link-tp/otnt:odtu-flex-type"

      This node is used, together with the other attributes in the otn-
      bandwidth container, to compute the OTN bandwidth information for
      an OTN link termination point, as described in Section 2.3.  By
      configuring, modifying or removing this data node, a malicious
      attacker may modify the OTN bandwidth.  The consequences of
      modifying the OTN bandwidth are reported below for the otn-
      bandwidth container.

   *  "/nw:networks/nw:network/nw:node/nt:termination-point/tet:te/
      otnt:client-svc"

      This subtree specifies the client traffic type supported by a link
      termination point.  By configuring it, an attacker may create an
      unauthorized client traffic path.  By removing it, a malicious
      attacker may cause client traffic to be disabled or misrouted.
      Such traffic changes may also affect the traffic on the
      surrounding OTN nodes and OTN links in this OTN topology and the
      connected topologies.

   *  "otnt:otn-bandwidth"

      This subtree specifies the configurations of OTN technology-
      specific information under any occurrence of the tet:te-bandwidth
      container, as defined in [RFC8795] (e.g.,
      "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      tet:max-resv-link-bandwidth/tet:te-bandwidth/otnt:otn-bandwidth").
      By configuring the OTN bandwidth attributes, an attacker may
      create an unauthorized OTN traffic path.  By removing or modifying
      it, a malicious attacker may cause OTN traffic to be disabled or
      misrouted.  Such traffic changes may also affect the traffic on
      the surrounding OTN nodes and OTN links in this OTN topology and
      the connected OTN topologies.

   *  "otnt:otn-label-range"

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      This subtree specifies the configurations of OTN technology-
      specific label range information under any occurrence of the
      tet:te-label-restriction container, as defined in [RFC8795] (e.g.,
      "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      tet:label-restrictions/tet:label-restriction\otnt:otn-label-
      range").  By configuring the OTN label range attributes, an
      attacker may create an unauthorized OTN traffic path.  By removing
      or modifying, a malicious attacker may cause OTN traffic to be
      disabled or misrouted.  Such traffic changes may also affect the
      traffic on the surrounding OTN nodes and OTN links in this OTN
      topology and the connected OTN topologies.

   *  "otnt:otn-label"

      This subtree specifies the configurations of OTN technology-
      specific label information under any occurrence of the tet:te-
      label container, as defined in [RFC8795] (e.g.,
      "/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/otnt:otn-label").  By configuring,
      removing or modifying the OTN label attributes, a malicious
      attacker may cause OTN traffic to be disabled or misrouted.  Such
      traffic changes may also affect the traffic on the surrounding OTN
      nodes and OTN links in this OTN topology and the connected OTN
      topologies.

   Some of the readable data nodes in this YANG module may be considered
   sensitive or vulnerable in some network environments.  It is thus
   important to control read access (e.g., via get, get-config, or
   notification) to these data nodes.  Specifically, the following
   subtrees and data nodes have particular sensitivities/
   vulnerabilities:

   *  "/nw:networks/nw:network/nw:network-types/tet:te-topology/
      otnt:otn-topology"

      Unauthorized access to this subtree can disclose the OTN topology
      type.

   *  "/nw:networks/nw:network/nw:node/tet:te/tet:te-node-attributes/
      otnt:otn-node"

      Unauthorized access to this subtree can disclose the OTN nodes.

   *  "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      otnt:otn-link/otnt:odtu-flex-type"

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      This node is used, together with the other attributes in the otn-
      bandwidth container, to compute the OTN bandwidth information for
      an OTN link, as described in Section 2.3.  Unauthorized access to
      this data node can disclose the OTN bandwidth information of OTN
      links.

   *  "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      otnt:otn-link/otnt:tsg"

      Unauthorized access to this data node can disclose configuration
      information of OTN links.

   *  "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      otnt:otn-link/otnt:distance"

      Unauthorized access to this data node can disclose state
      information of OTN links.

   *  "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      otnt:client-svc"

      Unauthorized access to this data node can disclose capabilities of
      OTN links.

   *  "/nw:networks/nw:network/nw:node/nt:termination-point/tet:te/
      otnt:otn-link-tp/otnt:odtu-flex-type"

      This node is used, together with the other attributes in the otn-
      bandwidth container, to compute the OTN bandwidth information for
      an OTN link termination point, as described in Section 2.3.
      Unauthorized access to this data node can disclose the OTN
      bandwidth information of OTN link termination points.

   *  "/nw:networks/nw:network/nw:node/nt:termination-point/tet:te/
      otnt:client-svc"

      Unauthorized access to this data node can disclose capabilities of
      OTN link termination points.

   *  "otnt:otn-bandwidth"

      This subtree specifies the configurations of OTN technology-
      specific information under any occurrence of the tet:te-bandwidth
      container, as defined in [RFC8795] (e.g.,
      "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      tet:max-resv-link-bandwidth/tet:te-bandwidth/otnt:otn-bandwidth").
      Unauthorized access to this data node can disclose the OTN
      bandwidth information of OTN links and link termination points.

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   *  "otnt:otn-label-range"

      This subtree specifies the configurations of OTN technology-
      specific label range information under any occurrence of the
      tet:te-label-restriction container, as defined in [RFC8795] (e.g.,
      "/nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/
      tet:label-restrictions/tet:label-restriction\otnt:otn-label-
      range").  Unauthorized access to this data node can disclose the
      state information of OTN links and link termination points.

   *  "otnt:otn-label"

      This subtree specifies the configurations of OTN technology-
      specific label information under any occurrence of the tet:te-
      label container, as defined in [RFC8795] (e.g.,
      "/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/otnt:otn-label").  Unauthorized access
      to this data node can disclose the state information of OTN links
      and link termination points.

   This YANG module does not define RPC operations.

   This YANG module uses groupings from other YANG modules that define
   nodes that may be considered sensitive or vulnerable in network
   environments.  Refer to the Security Considerations of
   [I-D.ietf-ccamp-layer1-types] for information as to which nodes may
   be considered sensitive or vulnerable in network environments.

   Finally, the YANG module described in this document augments the
   "ietf-network" YANG module [RFC8345] and the "ietf-te-topology" YANG
   module [RFC8795] by adding data nodes.  The security considerations
   for the subtrees described in those RFCs apply equally to the new
   data nodes that this module adds.

6.  References

6.1.  Normative References

   [I-D.ietf-ccamp-layer1-types]
              Zheng, H. and I. Busi, "Common YANG Data Types for Layer 1
              Networks", Work in Progress, Internet-Draft, draft-ietf-
              ccamp-layer1-types-18, 23 February 2024,
              <https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-
              layer1-types-18>.

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   [ITU-T_G.709]
              ITU-T Recommendation G.709, "Interfaces for the optical
              transport network", ITU-T G.709 , March 2020.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/rfc/rfc2119>.

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

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

   [RFC7139]  Zhang, F., Ed., Zhang, G., Belotti, S., Ceccarelli, D.,
              and K. Pithewan, "GMPLS Signaling Extensions for Control
              of Evolving G.709 Optical Transport Networks", RFC 7139,
              DOI 10.17487/RFC7139, March 2014,
              <https://www.rfc-editor.org/rfc/rfc7139>.

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

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.

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

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

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

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

6.2.  Informative References

   [I-D.ietf-ccamp-transport-nbi-app-statement]
              Busi, I., King, D., Zheng, H., and Y. Xu, "Transport
              Northbound Interface Applicability Statement", Work in
              Progress, Internet-Draft, draft-ietf-ccamp-transport-nbi-
              app-statement-17, 10 July 2023,
              <https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-
              transport-nbi-app-statement-17>.

   [I-D.ietf-netmod-rfc8407bis]
              Bierman, A., Boucadair, M., and Q. Wu, "Guidelines for
              Authors and Reviewers of Documents Containing YANG Data
              Models", Work in Progress, Internet-Draft, draft-ietf-
              netmod-rfc8407bis-20, 21 October 2024,
              <https://datatracker.ietf.org/doc/html/draft-ietf-netmod-
              rfc8407bis-20>.

   [I-D.ietf-teas-actn-yang]
              Lee, Y., Zheng, H., Ceccarelli, D., Yoon, B. Y., and S.
              Belotti, "Applicability of YANG models for Abstraction and
              Control of Traffic Engineered Networks", Work in Progress,
              Internet-Draft, draft-ietf-teas-actn-yang-11, 7 March
              2023, <https://datatracker.ietf.org/doc/html/draft-ietf-
              teas-actn-yang-11>.

   [RFC4252]  Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH)
              Authentication Protocol", RFC 4252, DOI 10.17487/RFC4252,
              January 2006, <https://www.rfc-editor.org/rfc/rfc4252>.

   [RFC7062]  Zhang, F., Ed., Li, D., Li, H., Belotti, S., and D.
              Ceccarelli, "Framework for GMPLS and PCE Control of G.709
              Optical Transport Networks", RFC 7062,
              DOI 10.17487/RFC7062, November 2013,
              <https://www.rfc-editor.org/rfc/rfc7062>.

   [RFC7951]  Lhotka, L., "JSON Encoding of Data Modeled with YANG",
              RFC 7951, DOI 10.17487/RFC7951, August 2016,
              <https://www.rfc-editor.org/rfc/rfc7951>.

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

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

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

   [RFC8453]  Ceccarelli, D., Ed. and Y. Lee, Ed., "Framework for
              Abstraction and Control of TE Networks (ACTN)", RFC 8453,
              DOI 10.17487/RFC8453, August 2018,
              <https://www.rfc-editor.org/rfc/rfc8453>.

   [RFC9000]  Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based
              Multiplexed and Secure Transport", RFC 9000,
              DOI 10.17487/RFC9000, May 2021,
              <https://www.rfc-editor.org/rfc/rfc9000>.

Appendix A.  YANG Tree

   This section provides the YANG Tree of the OTN topology data model.

   module: ietf-otn-topology

     augment /nw:networks/nw:network/nw:network-types/tet:te-topology:
       +--rw otn-topology!
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes:
       +--rw otn-node!
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes:
       +--rw otn-link
       |  +--rw odtu-flex-type?   l1-types:odtu-flex-type
       |  +--rw tsg?              identityref
       |  +--rw distance?         uint32
       +--rw client-svc!
          +--rw supported-client-signal*   identityref
     augment /nw:networks/nw:network/nw:node/nt:termination-point
               /tet:te:
       +--rw otn-link-tp
       |  +--rw odtu-flex-type?   l1-types:odtu-flex-type
       +--rw client-svc!
          +--rw supported-client-signal*   identityref
     augment /nw:networks/nw:network/nw:node/nt:termination-point/tet:te

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               /tet:interface-switching-capability/tet:max-lsp-bandwidth
               /tet:te-bandwidth/tet:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odu-type?        identityref
             +--rw max-ts-number?   uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:path-constraints/tet:te-bandwidth/tet:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odulist* [odu-type]
             |  +--rw odu-type     identityref
             |  +--rw number?      uint16
             |  +--rw ts-number?   uint16
             +--rw odtu-flex-type?   l1-types:odtu-flex-type
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:path-constraints
               /tet:te-bandwidth/tet:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odulist* [odu-type]
             |  +--rw odu-type     identityref
             |  +--rw number?      uint16
             |  +--rw ts-number?   uint16
             +--rw odtu-flex-type?   l1-types:odtu-flex-type
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:path-constraints/tet:te-bandwidth/tet:technology:
       +--:(otn)
          +--ro otn-bandwidth
             +--ro odulist* [odu-type]
             |  +--ro odu-type     identityref
             |  +--ro number?      uint16
             |  +--ro ts-number?   uint16
             +--ro odtu-flex-type?   l1-types:odtu-flex-type
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:path-constraints
               /tet:te-bandwidth/tet:technology:
       +--:(otn)
          +--ro otn-bandwidth
             +--ro odulist* [odu-type]
             |  +--ro odu-type     identityref
             |  +--ro number?      uint16
             |  +--ro ts-number?   uint16
             +--ro odtu-flex-type?   l1-types:odtu-flex-type

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     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point/tet:client-layer-adaptation
               /tet:switching-capability/tet:te-bandwidth
               /tet:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odulist* [odu-type]
             |  +--rw odu-type     identityref
             |  +--rw number?      uint16
             |  +--rw ts-number?   uint16
             +--rw odtu-flex-type?   l1-types:odtu-flex-type
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:path-constraints
               /tet:te-bandwidth/tet:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odulist* [odu-type]
             |  +--rw odu-type     identityref
             |  +--rw number?      uint16
             |  +--rw ts-number?   uint16
             +--rw odtu-flex-type?   l1-types:odtu-flex-type
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:path-constraints
               /tet:te-bandwidth/tet:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odulist* [odu-type]
             |  +--rw odu-type     identityref
             |  +--rw number?      uint16
             |  +--rw ts-number?   uint16
             +--rw odtu-flex-type?   l1-types:odtu-flex-type
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes
               /tet:interface-switching-capability/tet:max-lsp-bandwidth
               /tet:te-bandwidth/tet:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odu-type?        identityref
             +--rw max-ts-number?   uint16
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:max-link-bandwidth
               /tet:te-bandwidth:
       +--rw otn-bandwidth
          +--rw odulist* [odu-type]
             +--rw odu-type     identityref

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             +--rw number?      uint16
             +--rw ts-number?   uint16
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:max-resv-link-bandwidth
               /tet:te-bandwidth:
       +--rw otn-bandwidth
          +--rw odulist* [odu-type]
             +--rw odu-type     identityref
             +--rw number?      uint16
             +--rw ts-number?   uint16
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:unreserved-bandwidth
               /tet:te-bandwidth:
       +--rw otn-bandwidth
          +--rw odulist* [odu-type]
             +--rw odu-type     identityref
             +--rw number?      uint16
             +--rw ts-number?   uint16
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry
               /tet:interface-switching-capability/tet:max-lsp-bandwidth
               /tet:te-bandwidth/tet:technology:
       +--:(otn)
          +--ro otn-bandwidth
             +--ro odu-type?        identityref
             +--ro max-ts-number?   uint16
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:max-link-bandwidth
               /tet:te-bandwidth:
       +--ro otn-bandwidth
          +--ro odulist* [odu-type]
             +--ro odu-type     identityref
             +--ro number?      uint16
             +--ro ts-number?   uint16
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:max-resv-link-bandwidth
               /tet:te-bandwidth:
       +--ro otn-bandwidth
          +--ro odulist* [odu-type]
             +--ro odu-type     identityref
             +--ro number?      uint16
             +--ro ts-number?   uint16
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:unreserved-bandwidth
               /tet:te-bandwidth:
       +--ro otn-bandwidth
          +--ro odulist* [odu-type]
             +--ro odu-type     identityref

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             +--ro number?      uint16
             +--ro ts-number?   uint16
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes
               /tet:interface-switching-capability/tet:max-lsp-bandwidth
               /tet:te-bandwidth/tet:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odu-type?        identityref
             +--rw max-ts-number?   uint16
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:max-link-bandwidth
               /tet:te-bandwidth:
       +--rw otn-bandwidth
          +--rw odulist* [odu-type]
             +--rw odu-type     identityref
             +--rw number?      uint16
             +--rw ts-number?   uint16
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:max-resv-link-bandwidth
               /tet:te-bandwidth:
       +--rw otn-bandwidth
          +--rw odulist* [odu-type]
             +--rw odu-type     identityref
             +--rw number?      uint16
             +--rw ts-number?   uint16
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:unreserved-bandwidth
               /tet:te-bandwidth:
       +--rw otn-bandwidth
          +--rw odulist* [odu-type]
             +--rw odu-type     identityref
             +--rw number?      uint16
             +--rw ts-number?   uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction:
       +--rw otn-label-range!
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     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 otn-label-range!
          +--rw range-type?      otn-label-range-type

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          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        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:
       +--rw otn-label-range!
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction:
       +--ro otn-label-range!
          +--ro range-type?      otn-label-range-type
          +--ro tsg?             identityref
          +--ro odu-type-list*   identityref
          +--ro priority?        uint8
     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 otn-label-range!
          +--ro range-type?      otn-label-range-type
          +--ro tsg?             identityref
          +--ro odu-type-list*   identityref
          +--ro priority?        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:
       +--ro otn-label-range!
          +--ro range-type?      otn-label-range-type
          +--ro tsg?             identityref
          +--ro odu-type-list*   identityref
          +--ro priority?        uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:label-restrictions
               /tet:label-restriction:
       +--rw otn-label-range!
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /nw:networks/nw:network/nw:node/tet:te

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               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:label-restrictions
               /tet:label-restriction:
       +--rw otn-label-range!
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction:
       +--rw otn-label-range!
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:label-restrictions
               /tet:label-restriction:
       +--ro otn-label-range!
          +--ro range-type?      otn-label-range-type
          +--ro tsg?             identityref
          +--ro odu-type-list*   identityref
          +--ro priority?        uint8
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction:
       +--rw otn-label-range!
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn

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             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label

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             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts

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     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref

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             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     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:
       +--:(otn)
          +--ro otn-label-step
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     augment /nw:networks/nw:network/nw:node/tet:te

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               /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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label

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             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     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:
       +--:(otn)
          +--ro otn-label-step
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     augment /nw:networks/nw:network/nw:node/tet:te

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               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(otn)
          +--ro otn-label-step
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label

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             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref

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             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities

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               /tet:local-link-connectivity/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string

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     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet: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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:underlay/tet:backup-path

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               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     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:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:label-restrictions

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               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(otn)
          +--ro otn-label-step
             +--ro tpn?   otn-tpn
             +--ro ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     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:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts

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Appendix B.  JSON Examples

   This appendix contains an example of an instance data tree in JSON
   encoding [RFC7951].

   The example instantiates the "ietf-otn-topology" model for the OTN
   topology depicted in Figure 2 below.

   The OTN topology consists of three nodes (D1, D2, and D3) with three
   link termination (LTPs) each: two LTPs which terminates the links
   that belongs to the OTN topology and one LTP which terminates inter-
   domain links, as defined in [RFC8795].

   The OTN links within the OTN network are 100G OTN links while the
   links at the edge of the network are 10G links.  All these OTN links
   support ODU4, ODU2 and ODU0 connections.  The link between nodes D1
   and D2 also supports ODUflex.

   The OTN links within the OTN network are bidirectional and
   symmetrical: for this reasons, the link attributes (e.g., support for
   OTN switching capability or transparent client signal and the OTN
   maximum link bandwidth) are instantiated only on the link
   representing the forward direction, while the link representing the
   reverse direction are instantiated without any link attribute (other
   than the name) to indicate that the OTN links are bidirectional and
   symmetrical.

   The link between nodes D1 and D2 is an example of a multi-function
   link, as defined in Section 2.2, which can support both OTN and 100G
   client signal (e.g., 100GE): the interface-switching-capability list
   indicates support for OTN switching capability and the client-svc
   presence container is instantiated.

   For the LTPs which terminate OTN links, only the identifiers
   information is instantiated.  All the other properties are defined in
   the links they terminate.

   For the LTPs at the edge network, additional properties are
   instantiated to indicate whether the link can support OTN or
   transparent client signals.  In particular:

   *  LTP 1 on Node D1 is an example of an LTP terminating a multi-
      function access link, as defined in Section 2.2, which can support
      both OTN and 10G client signals (e.g., 10GE and STM-64): the
      interface-switching-capability list indicates support for OTN
      switching capability and the client-svc presence container is
      instantiated;

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   *  LTP 2 on Node D2 is an example of an LTP which can support only
      10G OTN (ODU2) signal: the interface-switching-capability list
      indicates support for OTN switching capability and the client-svc
      presence container is not instantiated;

   *  LTP 3 on Node D3 is an example of an LTP which can support only
      10G (e.g., 10GE and STM-64) client signals: the interface-
      switching-capability list does not indicate support for OTN
      switching capability and the client-svc presence container is
      instantiated.

                      +------------+                   +------------+
                      |     D1     |                   |     D2     |
                     /-\          /-\                 /-\          /-\
                     | | 1        | |---------------->| | 1        | |
                     | |        2 | |<----------------| |        2 | |
                     \-/    3     \-/                 \-/    3     \-/
                      |   /----\   |                   |   /----\   |
                      +---|    |---+                   +---|    |---+
                          \----/                           \----/
                           A  |                             A  |
                           |  |                             |  |
                           |  |                             |  |
                           |  |       +------------+        |  |
                           |  |       |     D3     |        |  |
                           |  |      /-\          /-\       |  |
                           |  +----->| | 1        | |-------+  |
                           +---------| |        2 | |<---------+
                                     \-/    3     \-/
                                      |   /----\   |
                                      +---|    |---+
                                          \----/

                     Figure 2: Example of OTN topology

   =============== NOTE: '\' line wrapping per RFC 8792 ================

   {
     "ietf-network:networks": {
       "network": [
         {
           "network-id": "example:otn-topology-example",
           "network-types": {
             "ietf-te-topology:te-topology": {
               "ietf-otn-topology:otn-topology": {}
             }
           },
           "ietf-te-topology:te-topology-identifier": {

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             "topology-id": "otn-topology-example"
           },
           "ietf-te-topology:te": {},
           "node": [
             {
               "node-id": "example:D1",
               "ietf-te-topology:te-node-id": "192.0.0.1",
               "ietf-te-topology:te": {
                 "te-node-attributes": {
                   "name": "Node D1",
                   "ietf-otn-topology:otn-node": {}
                 }
               },
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "example:D1-1",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "name": "Interface 1 of Node D1",
                     "interface-switching-capability": [
                       {
                         "switching-capability": "ietf-te-types:switchi\
   ng-otn",
                         "encoding": "ietf-te-types:lsp-encoding-oduk"
                       }
                     ],
                     "ietf-otn-topology:client-svc": {
                       "supported-client-signal": [
                         "ietf-layer1-types:ETH-10Gb-LAN",
                         "ietf-layer1-types:STM-64"
                       ]
                     }
                   }
                 },
                 {
                   "tp-id": "example:D1-2",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "name": "Interface 2 of Node D1"
                   }
                 },
                 {
                   "tp-id": "example:D1-3",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "name": "Interface 3 of Node D1"
                   }
                 }

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               ]
             },
             {
               "node-id": "example:D2",
               "ietf-te-topology:te-node-id": "192.0.0.2",
               "ietf-te-topology:te": {
                 "te-node-attributes": {
                   "name": "Node D2",
                   "ietf-otn-topology:otn-node": {}
                 }
               },
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "example:D2-1",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "name": "Interface 1 of Node D2"
                   }
                 },
                 {
                   "tp-id": "example:D2-2",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "name": "Interface 2 of Node D2",
                     "interface-switching-capability": [
                       {
                         "switching-capability": "ietf-te-types:switchi\
   ng-otn",
                         "encoding": "ietf-te-types:lsp-encoding-oduk"
                       }
                     ]
                   }
                 },
                 {
                   "tp-id": "example:D2-3",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "name": "Interface 3 of Node D2"
                   }
                 }
               ]
             },
             {
               "node-id": "example:D3",
               "ietf-te-topology:te-node-id": "192.0.0.3",
               "ietf-te-topology:te": {
                 "te-node-attributes": {
                   "name": "Node D3",

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                   "ietf-otn-topology:otn-node": {}
                 }
               },
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "example:D3-1",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "name": "Interface 1 of Node D3"
                   }
                 },
                 {
                   "tp-id": "example:D3-2",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "name": "Interface 2 of Node D3"
                   }
                 },
                 {
                   "tp-id": "example:D3-3",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "name": "Interface 3 of Node D3",
                     "ietf-otn-topology:client-svc": {
                       "supported-client-signal": [
                         "ietf-layer1-types:ETH-10Gb-LAN",
                         "ietf-layer1-types:STM-64"
                       ]
                     }
                   }
                 }
               ]
             }
           ],
           "ietf-network-topology:link": [
             {
               "link-id": "example:link/D1-2/D2-1",
               "ietf-te-topology:te": {
                 "te-link-attributes": {
                   "name": "Link between Node D1 and Node D2 (forward d\
   irection)",
                   "interface-switching-capability": [
                     {
                       "switching-capability": "ietf-te-types:switching\
   -otn",
                       "encoding": "ietf-te-types:lsp-encoding-oduk"
                     }
                   ],

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                   "max-link-bandwidth": {
                     "te-bandwidth": {
                       "ietf-otn-topology:otn-bandwidth": {
                         "odulist": [
                           {
                             "odu-type": "ietf-layer1-types:ODU4",
                             "number": 1
                           },
                           {
                             "odu-type": "ietf-layer1-types:ODU2",
                             "number": 10
                           },
                           {
                             "odu-type": "ietf-layer1-types:ODU0",
                             "number": 80
                           },
                           {
                             "odu-type": "ietf-layer1-types:ODUflex",
                             "number": 80,
                             "ts-number": 80
                           }
                         ]
                       }
                     }
                   },
                   "ietf-otn-topology:otn-link": {
                     "odtu-flex-type": "4"
                   },
                   "ietf-otn-topology:client-svc": {
                     "supported-client-signal": [
                       "ietf-layer1-types:ETH-100Gb"
                     ]
                   }
                 }
               }
             },
             {
               "link-id": "example:link/D2-1/D1-2",
               "ietf-te-topology:te": {
                 "te-link-attributes": {
                   "name": "Link between Node D1 and Node D2 (reverse d\
   irection)"
                 }
               }
             },
             {
               "link-id": "example:link/D2-3/D3-2",
               "ietf-te-topology:te": {

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                 "te-link-attributes": {
                   "name": "Link between Node D2 and Node D3 (forward d\
   irection)",
                   "interface-switching-capability": [
                     {
                       "switching-capability": "ietf-te-types:switching\
   -otn",
                       "encoding": "ietf-te-types:lsp-encoding-oduk"
                     }
                   ],
                   "max-link-bandwidth": {
                     "te-bandwidth": {
                       "ietf-otn-topology:otn-bandwidth": {
                         "odulist": [
                           {
                             "odu-type": "ietf-layer1-types:ODU4",
                             "number": 1
                           },
                           {
                             "odu-type": "ietf-layer1-types:ODU2",
                             "number": 10
                           },
                           {
                             "odu-type": "ietf-layer1-types:ODU0",
                             "number": 80
                           }
                         ]
                       }
                     }
                   }
                 }
               }
             },
             {
               "link-id": "example:link/D3-2/D2-3",
               "ietf-te-topology:te": {
                 "te-link-attributes": {
                   "name": "Link between Node D2 and Node D3 (reverse d\
   irection)"
                 }
               }
             },
             {
               "link-id": "example:link/D3-1/D1-3",
               "ietf-te-topology:te": {
                 "te-link-attributes": {
                   "name": "Link between Node D1 and Node D3 (reverse d\
   irection)"

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                 }
               }
             },
             {
               "link-id": "example:link/D1-3/D3-1",
               "ietf-te-topology:te": {
                 "te-link-attributes": {
                   "name": "Link between Node D1 and Node D3 (forward d\
   irection)",
                   "interface-switching-capability": [
                     {
                       "switching-capability": "ietf-te-types:switching\
   -otn",
                       "encoding": "ietf-te-types:lsp-encoding-oduk"
                     }
                   ],
                   "max-link-bandwidth": {
                     "te-bandwidth": {
                       "ietf-otn-topology:otn-bandwidth": {
                         "odulist": [
                           {
                             "odu-type": "ietf-layer1-types:ODU4",
                             "number": 1
                           },
                           {
                             "odu-type": "ietf-layer1-types:ODU2",
                             "number": 10
                           },
                           {
                             "odu-type": "ietf-layer1-types:ODU0",
                             "number": 80
                           }
                         ]
                       }
                     }
                   }
                 }
               }
             }
           ]
         }
       ]
     }
   }

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Acknowledgments

   We would like to thank Igor Bryskin, Zhe Liu, Zheyu Fan and Daniele
   Ceccarelli for their comments and discussions.

Contributors

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

   Anurag Sharma
   Google
   Email: ansha@google.com

   Yunbin Xu
   CAICT
   Email: xuyunbin@caict.ac.cn

   Lei Wang
   China Mobile
   Email: wangleiyj@chinamobile.com

   Baoquan Rao
   Huawei Technologies
   Email: raobaoquan@huawei.com

   Xian Zhang
   Huawei Technologies
   Email: Huawei Technologies

   Huub van Helvoort
   Hai Gaoming BV
   Email: huubatwork@gmail.com

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

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   Yunbo Li
   China Mobile
   Email: liyunbo@chinamobile.com

   Dieter Beller
   Nokia
   Email: dieter.beller@nokia.com

   TBD

Authors' Addresses

   Haomian Zheng
   Huawei Technologies
   H1, Huawei Industrial Base, Songshan Lake
   Dongguan
   Guangdong, 523808
   China
   Email: zhenghaomian@huawei.com

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

   Xufeng Liu
   Alef Edge
   Email: xufeng.liu.ietf@gmail.com

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

   Oscar Gonzalez de Dios
   Telefonica
   Email: oscar.gonzalezdedios@telefonica.com

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