Internet-Draft OTN Tunnel Model May 2026
Zheng, et al. Expires 28 November 2026 [Page]
Workgroup:
CCAMP Working Group
Internet-Draft:
draft-ietf-ccamp-otn-tunnel-model-25
Published:
Intended Status:
Standards Track
Expires:
Authors:
H. Zheng
Huawei Technologies
I. Busi
Huawei Technologies
S. Belotti
Nokia
V. Lopez
Nokia
Y. Xu
CAICT

A YANG Data Model for Optical Transport Network (OTN) Tunnels and Label Switched Paths

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.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at https://datatracker.ietf.org/drafts/current/.

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This Internet-Draft will expire on 28 November 2026.

▲

Table of Contents

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:

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

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.

Table 1: Prefixes and corresponding YANG modules
Prefix YANG module Reference
l1-types ietf-layer1-types [RFC YYYY]
otn-tnl ietf-otn-tunnel RFC XXXX
te ietf-te [RFC ZZZZ]

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.

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 

<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
     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
      "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
      "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
   */

  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;
  }

  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
      "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;
    }
  }

  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.";
    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;
    }
  }

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

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

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:

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:

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, , <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, , <https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-otn-topo-yang-20>.
[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, , <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 , .
[RFC6020]
Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, , <https://www.rfc-editor.org/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, , <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, , <https://www.rfc-editor.org/rfc/rfc7139>.
[RFC7950]
Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, , <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, , <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, , <https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-transport-nbi-app-statement-17>.
[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, , <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, , <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, , <https://www.rfc-editor.org/rfc/rfc4252>.
[RFC8040]
Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, , <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, , <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, , <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, , <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, , <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.

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)
             |  +--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)
             |  +--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)
       +--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)
             |  +--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
       +--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
          +--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:
    +--:(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
          +--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
          +--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)
       +--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
  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
          +--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)
       +--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)
       +--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
            /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
Anurag Sharma
Google
Rajan Rao
Infinera
Yunbo Li
China Mobile
Dieter Beller
Nokia
Yanlei Zheng
China Unicom
Xian Zhang
Huawei Technologies
Lei Wang
China Mobile
Oscar Gonzalez de Dios
Telefonica

Authors' Addresses

Haomian Zheng
Huawei Technologies
H1, Huawei Xiliu Beipo Village, Songshan Lake
Dongguan
Guangdong, 523808
China
Italo Busi
Huawei Technologies
Sergio Belotti
Nokia
Victor Lopez
Nokia
Yunbin Xu
CAICT