



CCAMP Working Group                                             H. Zheng
Internet-Draft                                                   I. Busi
Intended status: Standards Track                     Huawei Technologies
Expires: 28 November 2026                                     S. Belotti
                                                                V. Lopez
                                                                   Nokia
                                                                   Y. Xu
                                                                   CAICT
                                                             27 May 2026


A YANG Data Model for Optical Transport Network (OTN) Tunnels and Label
                             Switched Paths
                  draft-ietf-ccamp-otn-tunnel-model-25

Abstract

   This document describes the YANG data model for tunnels in OTN TE
   networks.  The model can be used to do the configuration in order to
   establish the tunnel in OTN network.  This work is independent with
   the control plane protocols.

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/IETF-ACTN-YANG-Model/draft-ietf-ccamp-
   otn-tunnel-model.html.  Status information for this document may be
   found at https://datatracker.ietf.org/doc/draft-ietf-ccamp-otn-
   tunnel-model/.

   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/IETF-ACTN-YANG-Model.

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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   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 28 November 2026.

Copyright Notice

   Copyright (c) 2026 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components
   extracted from this document must include Revised BSD License text as
   described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Editorial Note (To be removed by RFC Editor)  . . . . . .   3
     1.2.  Terminology and Notations . . . . . . . . . . . . . . . .   3
     1.3.  Tree Diagram  . . . . . . . . . . . . . . . . . . . . . .   4
     1.4.  Prefix in Data Node Names . . . . . . . . . . . . . . . .   4
   2.  OTN Tunnel Model Description  . . . . . . . . . . . . . . . .   4
     2.1.  Overview of OTN Tunnel Model  . . . . . . . . . . . . . .   4
     2.2.  Bandwidth Augmentation  . . . . . . . . . . . . . . . . .   5
     2.3.  Label Augmentation  . . . . . . . . . . . . . . . . . . .   5
   3.  OTN Tunnel YANG Code  . . . . . . . . . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  27
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  27
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  30
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  30
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  31
   Appendix A.  OTN Tunnel YANG Tree . . . . . . . . . . . . . . . .  32
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  48
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  48
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  49




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1.  Introduction

   OTN transport networks, specified in [ITU-T_G.709], can carry various
   types of client signals.  In many cases, the client signal is carried
   over an OTN tunnel across connected domains in a multi-domain
   network.

   This document provides YANG model for creating OTN tunnel.  The model
   augments the generic TE Tunnel model specified in
   [I-D.ietf-teas-yang-te].

1.1.  Editorial Note (To be removed by RFC Editor)

      Note to the RFC Editor: This section is to be removed prior to
      publication.

   This document contains placeholder values that need to be replaced
   with finalized values at the time of publication.  This note
   summarizes all of the substitutions that are needed.

   Please apply the following replacements:

   *  XXXX --> the assigned RFC number for this I-D

   *  YYYY --> the assigned RFC number fpr [I-D.ietf-ccamp-layer1-types]

   *  ZZZZ --> the assigned RFC number for [I-D.ietf-teas-yang-te]

   *  2026-05-19 --> the actual date of the publication of this document

1.2.  Terminology and Notations

   Refer to [I-D.ietf-ccamp-otn-topo-yang] for the OTN specific terms
   terms used in this document.

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

   *  client

   *  server

   *  augment

   *  data model

   *  data node




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   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].

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, 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 the following table.

               +==========+===================+============+
               | Prefix   | YANG module       | Reference  |
               +==========+===================+============+
               | l1-types | ietf-layer1-types | [RFC YYYY] |
               +----------+-------------------+------------+
               | otn-tnl  | ietf-otn-tunnel   | RFC XXXX   |
               +----------+-------------------+------------+
               | te       | ietf-te           | [RFC ZZZZ] |
               +----------+-------------------+------------+

                  Table 1: Prefixes and corresponding YANG
                                  modules

2.  OTN Tunnel Model Description

2.1.  Overview of OTN Tunnel Model

   This document aims to describe the data model for OTN tunnel.  The
   OTN tunnel model is using TE tunnel [I-D.ietf-teas-yang-te] as a
   basic model and augments it with OTN-specific parameters, including
   the bandwidth information and label information.  Figure 1 shows the
   augmentation relationship.







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

          Figure 1: Relationship between OTN and TE tunnel models

   It is also worth noting that the OTN tunnel provisioning is usually
   based on the OTN topology.  Therefore the OTN tunnel model is usually
   used together with OTN topology model specified in
   [I-D.ietf-ccamp-otn-topo-yang].  The OTN tunnel model also imports a
   few type modules, including ietf-layer1-types, ietf-te-types and
   ietf-inet-types.  The OTN-specific attributes in [RFC7139], including
   the Tributary Slot (TS) and Tributary Port Number (TPN), 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 tunnel model.

   More scenarios and model applications can be found in
   [I-D.ietf-ccamp-transport-nbi-app-statement] and
   [I-D.ietf-teas-actn-yang].

2.2.  Bandwidth Augmentation

   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].

2.3.  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, 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.  OTN Tunnel YANG Code




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   <CODE BEGINS> file "ietf-otn-tunnel@2026-05-19.yang"
   module ietf-otn-tunnel {
     yang-version 1.1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-otn-tunnel";
     prefix otn-tnl;

     import ietf-te {
       prefix te;
       reference
         "RFC ZZZZ: A YANG Data Model for Traffic Engineering Tunnels
                    and Interfaces.";
     }
     import ietf-layer1-types {
       prefix l1-types;
       reference
         "RFC YYYY: Common YANG Data Types for Layer 1 Networks.";
     }

     organization
       "IETF CCAMP Working Group";
     contact
       "WG Web:   <http://tools.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:   Sergio Belotti
                  <mailto:sergio.belotti@nokia.com>

        Editor:   Victor Lopez
                  <mailto:victor.lopez@nokia.com>

        Editor:   Yunbin Xu
                  <mailto:xuyunbin@caict.ac.cn>";
     description
       "This module defines a model for OTN Tunnel Services.

        Copyright (c) 2026 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



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        Relating to IETF Documents
        (https://trustee.ietf.org/license-info).

        All revisions of IETF and IANA published modules can be found
        at the YANG Parameters registry group
        (https://www.iana.org/assignments/yang-parameters).

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

     revision 2026-05-19 {
       description
         "Initial version";
       reference
         "RFC XXXX: A YANG Data Model for Optical Transport Network
                    (OTN) Tunnels and Label Switched Paths";
     }

     /*
      * Data nodes
      */
     /*
      * Augment TE bandwidth
      */

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/"
           + "te:te-bandwidth/te:technology" {
       description
         "Augment TE bandwidth of the named path constraint.";
       case otn {
         uses l1-types:otn-path-bandwidth;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:te-bandwidth/te:technology" {
       description
         "Augment TE bandwidth of the tunnel.";
       case otn {
         uses l1-types:otn-path-bandwidth;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:te-bandwidth/te:technology" {
       description



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         "Augment TE bandwidth of the primary path.";
       case otn {
         uses l1-types:otn-path-bandwidth;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:computed-paths-properties/"
           + "te:computed-path-properties/te:path-properties/"
           + "te:te-bandwidth/te:technology" {
       description
         "Augment TE bandwidth of primary path's computed path
          properties.";
       case otn {
         uses l1-types:otn-path-bandwidth;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:te-bandwidth/te:technology" {
       description
         "Augment TE bandwidth of the primary reverse path.";
       case otn {
         uses l1-types:otn-path-bandwidth;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:computed-paths-properties/"
           + "te:computed-path-properties/te:path-properties/"
           + "te:te-bandwidth/te:technology" {
       description
         "Augment TE bandwidth of the primary reverse path's computed
          path properties.";
       case otn {
         uses l1-types:otn-path-bandwidth;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:te-bandwidth/te:technology" {
       description



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         "Augment TE bandwidth of the secondary path.";
       case otn {
         uses l1-types:otn-path-bandwidth;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:computed-paths-properties/"
           + "te:computed-path-properties/te:path-properties/"
           + "te:te-bandwidth/te:technology" {
       description
         "Augment TE bandwidth of the secondary path's computed path
          properties.";
       case otn {
         uses l1-types:otn-path-bandwidth;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/"
           + "te:secondary-reverse-path/"
           + "te:te-bandwidth/te:technology" {
       description
         "Augment TE bandwidth of the secondary reverse path.";
       case otn {
         uses l1-types:otn-path-bandwidth;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/"
           + "te:secondary-reverse-path/"
           + "te:computed-paths-properties/"
           + "te:computed-path-properties/te:path-properties/"
           + "te:te-bandwidth/te:technology" {
       description
         "Augment TE bandwidth of the secondary reverse path's computed
          path properties.";
       case otn {
         uses l1-types:otn-path-bandwidth;
       }
     }

     /*
      * Augment TE label range information
      */




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     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-in-segment/"
           + "te:label-restrictions/te:label-restriction" {
       description
         "Augment TE label range information for the ingress segment
          of the named path constraint.";
       uses l1-types:otn-label-range-info;
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-out-segment/"
           + "te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the egress segment
          of the named path constraint.";
       uses l1-types:otn-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the ingress segment
          of the primary path.";
       uses l1-types:otn-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the egress segment
          of the primary path.";
       uses l1-types:otn-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the ingress segment
          of the primary reverse path.";
       uses l1-types:otn-label-range-info;



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     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the egress segment
          of the primary reverse path.";
       uses l1-types:otn-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the ingress segment
          of the secondary path.";
       uses l1-types:otn-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the egress segment
          of the secondary path.";
       uses l1-types:otn-label-range-info;
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction" {
       description
         "Augment TE label range information for the ingress segment
          of the secondary reverse path.";
       uses l1-types:otn-label-range-info;
     }

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



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         "Augment TE label range information for the egress segment
          of the secondary reverse path.";
       uses l1-types:otn-label-range-info;
     }

     /*
      * Augment TE label.
      */

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/"
           + "te:explicit-route-objects/"
           + "te:route-object-exclude-always/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects always
          excluded by the path computation with the named path
          constraint.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/"
           + "te:explicit-route-objects/"
           + "te:route-object-include-exclude/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects included
          or excluded by the path computation with the named path
          constraint.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-in-segment/"
           + "te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the ingress segment
          of the named path constraint.";
       case otn {
         uses l1-types:otn-label-start-end;
       }



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     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-in-segment/"
           + "te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the ingress segment
          of the named path constraint.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-in-segment/"
           + "te:label-restrictions/te:label-restriction/"
           + "te:label-step/te:technology" {
       description
         "Augment TE label range step for the ingress segment
          of the named path constraint.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-out-segment/"
           + "te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the egress segment
          of the named path constraint.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

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



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       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/te:path-out-segment/"
           + "te:label-restrictions/te:label-restriction/"
           + "te:label-step/te:technology" {
       description
         "Augment TE label range step for the egress segment
          of the named path constraint.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/"
           + "te:explicit-route-exclude-objects/"
           + "te:route-object-exclude-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
          route objects excluded by the path computation of the primary
          path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/"
           + "te:explicit-route-include-objects/"
           + "te:route-object-include-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
          route objects included by the path computation of the primary
          path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }



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     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:explicit-route-objects/"
           + "te:route-object-exclude-always/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects always
          excluded by the path computation of the primary path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:explicit-route-objects/"
           + "te:route-object-include-exclude/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects included
          or excluded by the path computation of the primary path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the ingress segment
          of the primary path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

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



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         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the ingress segment
          of the primary path.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the egress segment
          of the primary path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the egress segment
          of the primary path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

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



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          of the primary path.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:computed-paths-properties/"
           + "te:computed-path-properties/te:path-properties/"
           + "te:path-route-objects/te:path-route-object/"
           + "te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the route object of the computed
          primary path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/"
           + "te:explicit-route-exclude-objects/"
           + "te:route-object-exclude-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
          route objects excluded by the path computation of the primary
          reverse path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

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



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          route objects included by the path computation of the primary
          reverse path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:explicit-route-objects/"
           + "te:route-object-exclude-always/"
           + "te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects always
          excluded by the path computation of the primary reverse
          path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:explicit-route-objects/"
           + "te:route-object-include-exclude/"
           + "te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects included
          or excluded by the path computation of the primary reverse
          path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

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



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       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the ingress segment
          of the primary reverse path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the ingress segment
          of the primary reverse path.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the egress segment
          of the primary reverse path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

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



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           + "te:primary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the egress segment
          of the primary reverse path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the egress segment
          of the primary reverse path.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:computed-paths-properties/"
           + "te:computed-path-properties/te:path-properties/"
           + "te:path-route-objects/te:path-route-object/te:type/"
           + "te:label/te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the route object of the computed
          primary reverse path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

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



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         "Augment TE label hop for the optimization of the explicit
          route objects excluded by the path computation of the
          secondary path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/"
           + "te:explicit-route-include-objects/"
           + "te:route-object-include-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
          route objects included by the path computation of the
          secondary path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:explicit-route-objects/"
           + "te:route-object-exclude-always/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects always
          excluded by the path computation of the secondary path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:explicit-route-objects/"
           + "te:route-object-include-exclude/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects included
          or excluded by the path computation of the secondary path.";
       case otn {
         uses l1-types:otn-label-hop;
       }



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     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the ingress segment
          of the secondary path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the ingress segment
          of the secondary path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the ingress segment
          of the secondary path.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the egress segment
          of the secondary path.";



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       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the egress segment
          of the secondary path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the egress segment
          of the secondary path.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:computed-paths-properties/"
           + "te:computed-path-properties/"
           + "te:path-properties/te:path-route-objects/"
           + "te:path-route-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the route object of the computed
          secondary path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

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



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           + "te:optimization-metric/"
           + "te:explicit-route-exclude-objects/"
           + "te:route-object-exclude-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
          route objects excluded by the path computation of the
          secondary reverse path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:optimizations/te:algorithm/te:metric/"
           + "te:optimization-metric/"
           + "te:explicit-route-include-objects/"
           + "te:route-object-include-object/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the optimization of the explicit
          route objects included by the path computation of the
          secondary reverse path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:explicit-route-objects/"
           + "te:route-object-exclude-always/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the explicit route objects always
          excluded by the path computation of the secondary reverse
          path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

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



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       description
         "Augment TE label hop for the explicit route objects included
          or excluded by the path computation of the secondary reverse
          path.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the ingress segment
          of the secondary reverse path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the ingress segment
          of the secondary reverse path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the ingress segment
          of the secondary reverse path.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"



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           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range start for the egress segment
          of the secondary reverse path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-end/"
           + "te:te-label/te:technology" {
       description
         "Augment TE label range end for the egress segment
          of the secondary reverse path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-reverse-paths/te:secondary-reverse-path/"
           + "te:path-out-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-step/te:technology" {
       description
         "Augment TE label range step for the egress segment
          of the secondary reverse path.";
       case otn {
         uses l1-types:otn-label-step;
       }
     }

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



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         uses l1-types:otn-label-hop;
       }
     }

     augment "/te:te/te:lsps/"
           + "te:lsp/te:lsp-actual-route-information/"
           + "te:lsp-actual-route-information/te:type/te:label/"
           + "te:label-hop/te:te-label/te:technology" {
       description
         "Augment TE label hop for the record route of the LSP.";
       case otn {
         uses l1-types:otn-label-hop;
       }
     }
   }
   <CODE ENDS>

                                  Figure 2

4.  IANA Considerations

   IANA is requested to register the following URI in the "ns" registry
   within the "IETF XML Registry" group [RFC3688]:

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

   IANA is requested to register the following YANG module in the "YANG
   Module Names" registry [RFC6020] within the "YANG Parameters"
   registry group.

      Name:         ietf-otn-tunnel
      Maintained by IANA?  N
      Namespace:    urn:ietf:params:xml:ns:yang:ietf-otn-tunnel
      Prefix:       otn-tnl
      Reference:    RFC XXXX

5.  Security Considerations

   This section is modeled after the template described in Section 3.7
   of [RFC9907].

   The "ietf-otn-tunnel" YANG module defines a data model that is
   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.



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   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:

   *  "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 [I-D.ietf-teas-yang-te] (e.g.,
      "/te:te/te:tunnels/te:tunnel/te:te-
      bandwidth/te:technology/otnt:otn/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.

   *  "otnt:otn-label-range"

      This subtree specifies the configurations of OTN technology-
      specific label range information under any occurrence of the
      tet:label-restriction container, as defined in
      [I-D.ietf-teas-yang-te] (e.g., "/te:te/te:tunnels/te:tunnel/
      te:primary-paths/te:primary-path/te:path-in-segment/te:label-
      restrictions/te: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.

   *  "otnt:otn-label"












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      This subtree specifies the configurations of OTN technology-
      specific label information under any occurrence of the tet:te-
      label container, as defined in [I-D.ietf-teas-yang-te] (e.g.,
      "/te:te/te:tunnels/te:tunnel/te:primary-paths/te:primary-path/
      te:explicit-route-objects/te:route-object-include-
      exclude/te:type/te:label/te:label-hop/te:te-
      label/te:technology/otnt:otn/otnt:otn-label").  By configuring,
      removing or modifying the OTN label attributes, a malicious
      attacker may cause OTN traffic to be disabled or misrouted.

   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:

   *  "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 [I-D.ietf-teas-yang-te] (e.g.,
      "/te:te/te:tunnels/te:tunnel/te:te-
      bandwidth/te:technology/otnt:otn/otnt:otn-bandwidth").
      Unauthorized access to this data node can disclose the OTN
      bandwidth information of OTN tunnels and LSPs.

   *  "otnt:otn-label-range"

      This subtree specifies the configurations of OTN technology-
      specific label range information under any occurrence of the
      tet:label-restriction container, as defined in
      [I-D.ietf-teas-yang-te] (e.g., "/te:te/te:tunnels/te:tunnel/
      te:primary-paths/te:primary-path/te:path-in-segment/te:label-
      restrictions/te:label-restriction/otnt:otn-label-range").
      Unauthorized access to this data node can disclose the state
      information of OTN tunnels and LSPs.

   *  "otnt:otn-label"












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      This subtree specifies the configurations of OTN technology-
      specific label information under any occurrence of the tet:te-
      label container, as defined in [I-D.ietf-teas-yang-te] (e.g.,
      "/te:te/te:tunnels/te:tunnel/te:primary-paths/te:primary-path/
      te:explicit-route-objects/te:route-object-include-
      exclude/te:type/te:label/te:label-hop/te:te-
      label/te:technology/otnt:otn/otnt:otn-label").  Unauthorized
      access to this data node can disclose the state information of OTN
      tunnels and LSPs.

   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-te" YANG module [I-D.ietf-teas-yang-te] 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>.

   [I-D.ietf-ccamp-otn-topo-yang]
              Zheng, H., Busi, I., Liu, X., Belotti, S., and O. G. de
              Dios, "A YANG Data Model for Optical Transport Network
              Topology", Work in Progress, Internet-Draft, draft-ietf-
              ccamp-otn-topo-yang-20, 7 November 2024,
              <https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-
              otn-topo-yang-20>.










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   [I-D.ietf-teas-yang-te]
              Saad, T., Gandhi, R., Liu, X., Beeram, V. P., and I.
              Bryskin, "A YANG Data Model for Traffic Engineering
              Tunnels, Label Switched Paths, and Interfaces", Work in
              Progress, Internet-Draft, draft-ietf-teas-yang-te-44, 26
              March 2026, <https://datatracker.ietf.org/doc/html/draft-
              ietf-teas-yang-te-44>.

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

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

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

   [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>.

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>.





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   [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>.

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

   [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>.

   [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>.

   [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>.

   [RFC9907]  Bierman, A., Boucadair, M., Ed., and Q. Wu, "Guidelines
              for Authors and Reviewers of Documents Containing YANG
              Data Models", BCP 216, RFC 9907, DOI 10.17487/RFC9907,
              March 2026, <https://www.rfc-editor.org/rfc/rfc9907>.

Appendix A.  OTN Tunnel YANG Tree

   This appendix presents the complete tree of the YANG data model
   defined in module "ietf-otn-tunnel.yang", defined in Section 3.  See
   [RFC8340] for an explanation of the symbols used.








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   module: ietf-otn-tunnel

     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:te-bandwidth/te:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        union
                +--:(cbr)
                |  +--rw client-type             identityref
                +--:(gfp-n-k)
                |  +--rw gfp-n                   uint8
                |  +--rw gfp-k?                  gfp-k
                +--:(flexe-client)
                |  +--rw flexe-client            flexe-client-rate
                +--:(flexe-aware)
                |  +--rw flexe-aware-n           uint16
                +--:(packet)
                   +--rw opuflex-payload-rate    union
     augment /te:te/te:tunnels/te:tunnel/te:te-bandwidth/te:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        union
                +--:(cbr)
                |  +--rw client-type             identityref
                +--:(gfp-n-k)
                |  +--rw gfp-n                   uint8
                |  +--rw gfp-k?                  gfp-k
                +--:(flexe-client)
                |  +--rw flexe-client            flexe-client-rate
                +--:(flexe-aware)
                |  +--rw flexe-aware-n           uint16
                +--:(packet)
                   +--rw opuflex-payload-rate    union
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:te-bandwidth/te:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        union
                +--:(cbr)



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                |  +--rw client-type             identityref
                +--:(gfp-n-k)
                |  +--rw gfp-n                   uint8
                |  +--rw gfp-k?                  gfp-k
                +--:(flexe-client)
                |  +--rw flexe-client            flexe-client-rate
                +--:(flexe-aware)
                |  +--rw flexe-aware-n           uint16
                +--:(packet)
                   +--rw opuflex-payload-rate    union
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:computed-paths-properties
               /te:computed-path-properties/te:path-properties
               /te:te-bandwidth/te:technology:
       +--:(otn)
          +--ro otn-bandwidth
             +--ro odu-type?                     identityref
             +--ro (oduflex-type)?
                +--:(generic)
                |  +--ro nominal-bit-rate        union
                +--:(cbr)
                |  +--ro client-type             identityref
                +--:(gfp-n-k)
                |  +--ro gfp-n                   uint8
                |  +--ro gfp-k?                  gfp-k
                +--:(flexe-client)
                |  +--ro flexe-client            flexe-client-rate
                +--:(flexe-aware)
                |  +--ro flexe-aware-n           uint16
                +--:(packet)
                   +--ro opuflex-payload-rate    union
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path/te:te-bandwidth
               /te:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        union
                +--:(cbr)
                |  +--rw client-type             identityref
                +--:(gfp-n-k)
                |  +--rw gfp-n                   uint8
                |  +--rw gfp-k?                  gfp-k
                +--:(flexe-client)
                |  +--rw flexe-client            flexe-client-rate
                +--:(flexe-aware)



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                |  +--rw flexe-aware-n           uint16
                +--:(packet)
                   +--rw opuflex-payload-rate    union
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:computed-paths-properties/te:computed-path-properties
               /te:path-properties/te:te-bandwidth/te:technology:
       +--:(otn)
          +--ro otn-bandwidth
             +--ro odu-type?                     identityref
             +--ro (oduflex-type)?
                +--:(generic)
                |  +--ro nominal-bit-rate        union
                +--:(cbr)
                |  +--ro client-type             identityref
                +--:(gfp-n-k)
                |  +--ro gfp-n                   uint8
                |  +--ro gfp-k?                  gfp-k
                +--:(flexe-client)
                |  +--ro flexe-client            flexe-client-rate
                +--:(flexe-aware)
                |  +--ro flexe-aware-n           uint16
                +--:(packet)
                   +--ro opuflex-payload-rate    union
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:te-bandwidth/te:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        union
                +--:(cbr)
                |  +--rw client-type             identityref
                +--:(gfp-n-k)
                |  +--rw gfp-n                   uint8
                |  +--rw gfp-k?                  gfp-k
                +--:(flexe-client)
                |  +--rw flexe-client            flexe-client-rate
                +--:(flexe-aware)
                |  +--rw flexe-aware-n           uint16
                +--:(packet)
                   +--rw opuflex-payload-rate    union
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:computed-paths-properties
               /te:computed-path-properties/te:path-properties
               /te:te-bandwidth/te:technology:
       +--:(otn)



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          +--ro otn-bandwidth
             +--ro odu-type?                     identityref
             +--ro (oduflex-type)?
                +--:(generic)
                |  +--ro nominal-bit-rate        union
                +--:(cbr)
                |  +--ro client-type             identityref
                +--:(gfp-n-k)
                |  +--ro gfp-n                   uint8
                |  +--ro gfp-k?                  gfp-k
                +--:(flexe-client)
                |  +--ro flexe-client            flexe-client-rate
                +--:(flexe-aware)
                |  +--ro flexe-aware-n           uint16
                +--:(packet)
                   +--ro opuflex-payload-rate    union
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:te-bandwidth/te:technology:
       +--:(otn)
          +--rw otn-bandwidth
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        union
                +--:(cbr)
                |  +--rw client-type             identityref
                +--:(gfp-n-k)
                |  +--rw gfp-n                   uint8
                |  +--rw gfp-k?                  gfp-k
                +--:(flexe-client)
                |  +--rw flexe-client            flexe-client-rate
                +--:(flexe-aware)
                |  +--rw flexe-aware-n           uint16
                +--:(packet)
                   +--rw opuflex-payload-rate    union
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:computed-paths-properties
               /te:computed-path-properties/te:path-properties
               /te:te-bandwidth/te:technology:
       +--:(otn)
          +--ro otn-bandwidth
             +--ro odu-type?                     identityref
             +--ro (oduflex-type)?
                +--:(generic)
                |  +--ro nominal-bit-rate        union
                +--:(cbr)
                |  +--ro client-type             identityref
                +--:(gfp-n-k)



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                |  +--ro gfp-n                   uint8
                |  +--ro gfp-k?                  gfp-k
                +--:(flexe-client)
                |  +--ro flexe-client            flexe-client-rate
                +--:(flexe-aware)
                |  +--ro flexe-aware-n           uint16
                +--:(packet)
                   +--ro opuflex-payload-rate    union
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-in-segment
               /te:label-restrictions/te: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 /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-out-segment
               /te:label-restrictions/te: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 /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te: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 /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-out-segment
               /te:label-restrictions/te: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 /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-in-segment/te:label-restrictions
               /te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref



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          +--rw priority?        uint8
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-out-segment/te:label-restrictions
               /te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-in-segment
               /te:label-restrictions/te: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 /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-out-segment
               /te:label-restrictions/te: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 /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:explicit-route-objects
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label



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             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:explicit-route-objects
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-in-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-out-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:



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       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:optimizations/te:algorithm/te:metric
               /te:optimization-metric/te:explicit-route-exclude-objects
               /te:route-object-exclude-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:optimizations/te:algorithm/te:metric
               /te:optimization-metric/te:explicit-route-include-objects
               /te:route-object-include-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:explicit-route-objects
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:explicit-route-objects
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn



Zheng, et al.           Expires 28 November 2026               [Page 40]

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             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-start/te:te-label
               /te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-end/te:te-label
               /te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-step/te:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn



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             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:computed-paths-properties
               /te:computed-path-properties/te:path-properties
               /te:path-route-objects/te:path-route-object/te:type
               /te:label/te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path/te:optimizations
               /te:algorithm/te:metric/te:optimization-metric
               /te:explicit-route-exclude-objects
               /te:route-object-exclude-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path/te:optimizations
               /te:algorithm/te:metric/te:optimization-metric
               /te:explicit-route-include-objects
               /te:route-object-include-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:explicit-route-objects/te:route-object-exclude-always
               /te:type/te:label/te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:explicit-route-objects
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)



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          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-start/te:te-label
               /te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-end/te:te-label
               /te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-step/te:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-out-segment/te:label-restrictions
               /te:label-restriction/te:label-start/te:te-label
               /te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-out-segment/te:label-restrictions
               /te:label-restriction/te:label-end/te:te-label
               /te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts



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     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-out-segment/te:label-restrictions
               /te:label-restriction/te:label-step/te:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:computed-paths-properties/te:computed-path-properties
               /te:path-properties/te:path-route-objects
               /te:path-route-object/te:type/te:label/te:label-hop
               /te:te-label/te:technology:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:optimizations/te:algorithm
               /te:metric/te:optimization-metric
               /te:explicit-route-exclude-objects
               /te:route-object-exclude-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:optimizations/te:algorithm
               /te:metric/te:optimization-metric
               /te:explicit-route-include-objects
               /te:route-object-include-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:explicit-route-objects
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn



Zheng, et al.           Expires 28 November 2026               [Page 44]

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             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:explicit-route-objects
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(otn)



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          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:computed-paths-properties
               /te:computed-path-properties/te:path-properties
               /te:path-route-objects/te:path-route-object/te:type
               /te:label/te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:optimizations/te:algorithm
               /te:metric/te:optimization-metric
               /te:explicit-route-exclude-objects
               /te:route-object-exclude-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:optimizations/te:algorithm
               /te:metric/te:optimization-metric
               /te:explicit-route-include-objects
               /te:route-object-include-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:explicit-route-objects
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)



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          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:explicit-route-objects
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?       otn-tpn
             +--rw tsg?       identityref
             +--rw ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction
               /te:label-start/te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-end



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               /te:te-label/te:technology:
       +--:(otn)
          +--rw otn-label
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction/te:label-step
               /te:technology:
       +--:(otn)
          +--rw otn-label-step
             +--rw tpn?   otn-tpn
             +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:computed-paths-properties
               /te:computed-path-properties/te:path-properties
               /te:path-route-objects/te:path-route-object/te:type
               /te:label/te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     augment /te:te/te:lsps/te:lsp/te:lsp-actual-route-information
               /te:lsp-actual-route-information/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--ro otn-label
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string

                                  Figure 3

Acknowledgments

   We would like to thank Yu Chaode for his comments and discussions.

Contributors

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


   Anurag Sharma
   Google
   Email: ansha@google.com



Zheng, et al.           Expires 28 November 2026               [Page 48]

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   Rajan Rao
   Infinera
   Email: rrao@infinera.com


   Yunbo Li
   China Mobile
   Email: liyunbo@chinamobile.com


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


   Yanlei Zheng
   China Unicom
   Email: zhengyanlei@chinaunicom.cn


   Xian Zhang
   Huawei Technologies
   Email: Huawei Technologies


   Lei Wang
   China Mobile
   Email: wangleiyj@chinamobile.com


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


Authors' Addresses

   Haomian Zheng
   Huawei Technologies
   H1, Huawei Xiliu Beipo Village, Songshan Lake
   Dongguan
   Guangdong, 523808
   China
   Email: zhenghaomian@huawei.com


   Italo Busi
   Huawei Technologies



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   Email: italo.busi@huawei.com


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


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


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



































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