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A YANG Data Model for Optical Transport Network (OTN) Tunnels and Label Switched Paths
draft-ietf-ccamp-otn-tunnel-model-22

Document Type Active Internet-Draft (ccamp WG)
Authors Haomian Zheng , Italo Busi , Sergio Belotti , Victor Lopez , Yunbin Xu
Last updated 2024-12-03
Replaces draft-sharma-ccamp-otn-tunnel-model
RFC stream Internet Engineering Task Force (IETF)
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Additional resources Yang catalog entry for ietf-otn-tunnel@2020-03-09.yang
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draft-ietf-ccamp-otn-tunnel-model-22
CCAMP Working Group                                             H. Zheng
Internet-Draft                                                   I. Busi
Intended status: Standards Track                     Huawei Technologies
Expires: 6 June 2025                                          S. Belotti
                                                                V. Lopez
                                                                   Nokia
                                                                   Y. Xu
                                                                   CAICT
                                                         3 December 2024

A YANG Data Model for Optical Transport Network (OTN) Tunnels and Label
                             Switched Paths
                  draft-ietf-ccamp-otn-tunnel-model-22

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.

   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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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 6 June 2025.

Copyright Notice

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

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology and Notations . . . . . . . . . . . . . . . .   3
     1.2.  Tree Diagram  . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Prefix in Data Node Names . . . . . . . . . . . . . . . .   3
   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 Tree  . . . . . . . . . . . . . . . . . . . .   5
   4.  OTN Tunnel YANG Code  . . . . . . . . . . . . . . . . . . . .  21
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  42
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  43
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  45
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  45
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  47
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  48
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  48
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  49

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.

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   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].

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

1.1.  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].

1.2.  Tree Diagram

   A simplified graphical representation of the data model is used in
   Section 3 of this this document.  The meaning of the symbols in these
   diagrams is defined in [RFC8340].

1.3.  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.

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               +==========+===================+============+
               | 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

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

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

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   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 Tree

   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)

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                   +--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

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                +--:(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

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                +--:(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

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             +--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

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          +--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

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               /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

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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:
       +--:(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

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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: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

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               /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

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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: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

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             +--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

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               /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

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               /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

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             +--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

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             +--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

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             +--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 2

4.  OTN Tunnel YANG Code

   <CODE BEGINS> file "ietf-otn-tunnel@2024-03-21.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.";
     }
     /* Note: The RFC Editor will replace ZZZZ with the number assigned
        to the RFC once draft-ietf-teas-yang-te becomes an RFC.*/

     import ietf-layer1-types {
       prefix "l1-types";
       reference
         "RFC YYYY: Common YANG Data Types for Layer 1 Networks.";
     }
     /* Note: The RFC Editor will replace YYYY with the number assigned
        to the RFC once draft-ietf-ccamp-layer1-types becomes an RFC.*/

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

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

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        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.

       The model fully conforms to the Network Management
       Datastore Architecture (NMDA).

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

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

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

     revision "2024-03-21" {
       description
         "Initial version";
       reference
         "RFC XXXX: A YANG Data Model for Optical Transport Network
         (OTN) Tunnels and Label Switched Paths";
       // RFC Ed.: replace XXXX with actual RFC number, update date
       // information and remove this note
     }

    /*
     * Data nodes
     */

     /*
      * Augment TE bandwidth
      */

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     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.";

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       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.";

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       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

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         of the primay 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 primay 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 primay 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 primay 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/"

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           + "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/"

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           + "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;
       }

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     }

     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

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         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;
       }
     }

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     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 primay 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 primay 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 primay 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 primay path.";
       case otn {
         uses l1-types:otn-label-start-end;

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       }
     }

     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 primay 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 primay 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/"

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           + "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/"

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           + "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 primay 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 primay 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 primay reverse path.";
       case otn {

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         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 primay 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 primay 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 primay 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/"

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           + "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

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         "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/"

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           + "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/"

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           + "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/"

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           + "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;
       }

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     }

     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 {

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         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 3

5.  IANA Considerations

   IANA is requested to register the following URI in the "ns"
   subregistry within the "IETF XML Registry" [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" subregistry [RFC6020] within the "YANG Parameters"
   registry.

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         name:         ietf-otn-tunnel
         namespace:    urn:ietf:params:xml:ns:yang:ietf-otn-tunnel
         prefix:       otn-tnl
         reference:    RFC XXXX

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

6.  Security Considerations

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

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

   The Network Configuration Access Control Model (NACM) [RFC8341]
   provides the means to restrict access for particular NETCONF or
   RESTCONF users to a preconfigured subset of all available NETCONF or
   RESTCONF protocol operations and content.

   There are a number of data nodes defined in this YANG module that are
   writable/creatable/deletable (i.e., config true, which is the
   default).  These data nodes can be considered sensitive or vulnerable
   in some network environments.  Write operations (e.g., edit-config)
   to these data nodes without proper protection can have a negative
   effect on network operations.  Specifically, the following subtrees
   and data nodes have particular sensitivities/vulnerabilities:

   *  "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"

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      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"

      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"

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      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"

      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.

7.  References

7.1.  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

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              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>.

   [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-37, 9
              October 2024, <https://datatracker.ietf.org/doc/html/
              draft-ietf-teas-yang-te-37>.

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

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

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

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

7.2.  Informative References

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

   [I-D.ietf-netmod-rfc8407bis]
              Bierman, A., Boucadair, M., and Q. Wu, "Guidelines for
              Authors and Reviewers of Documents Containing YANG Data
              Models", Work in Progress, Internet-Draft, draft-ietf-
              netmod-rfc8407bis-21, 13 November 2024,
              <https://datatracker.ietf.org/doc/html/draft-ietf-netmod-
              rfc8407bis-21>.

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

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

   [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>.

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   [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>.

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

   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

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Internet-Draft              OTN Tunnel Model               December 2024

   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
   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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