\
CCAMP Working Group                                             H. Zheng
Internet-Draft                                                   I. Busi
Intended status: Standards Track                     Huawei Technologies
Expires: 10 October 2022                                      S. Belotti
                                                                V. Lopez
                                                                   Nokia
                                                                   Y. Xu
                                                                   CAICT
                                                            8 April 2022


                         OTN Tunnel YANG Model
                  draft-ietf-ccamp-otn-tunnel-model-16

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.

Status of This Memo

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

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

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

   This Internet-Draft will expire on 10 October 2022.

Copyright Notice

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

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components



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   extracted from this document must include Revised BSD License text as
   described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology and Notations . . . . . . . . . . . . . . . .   2
     1.2.  Tree Diagram  . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Prefix in Data Node Names . . . . . . . . . . . . . . . .   3
   2.  OTN Tunnel Model Description  . . . . . . . . . . . . . . . .   3
     2.1.  Overview of OTN Tunnel Model  . . . . . . . . . . . . . .   4
     2.2.  Bandwidth Augmentation  . . . . . . . . . . . . . . . . .   4
     2.3.  Label Augmentation  . . . . . . . . . . . . . . . . . . .   5
   3.  OTN Tunnel YANG Tree  . . . . . . . . . . . . . . . . . . . .   5
   4.  OTN Tunnel YANG Code  . . . . . . . . . . . . . . . . . . . .  23
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  44
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  45
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  45
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  45
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  46
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  46
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  47
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  48

1.  Introduction

   OTN transport networks, specified in [ITU-Tg709], can carry various
   types of client signals.  In many cases, the client signal is carried
   over an OTN tunnel across connected domains in a multi-domain
   network.

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

1.1.  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




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   *  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.


      +-------------+-------------------------+------------------------+
      | Prefix      | YANG module             | Reference              |
      +-------------+-------------------------+------------------------+
      | l1-types    | ietf-layer1-types       | [RFCYYYY]              |
      | otntnl      | ietf-otn-tunnel         | [RFCXXXX]              |
      | te          | ietf-te                 | [RFCZZZZ]              |
      +-------------+-------------------------+------------------------+
            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






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2.1.  Overview of OTN Tunnel Model

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


                           +----------------+
              TE generic   |     ietf-te    |
                           +----------------+
                                    ^
                                    |
                                    | Augments
                                    |
                           +--------+--------+
              OTN          | ietf-otn-tunnel |
                           +-----------------+
          Figure 1 - Relationship between OTN and TE tunnel models


   It is also worth noting that the OTN tunnel provisioning is usually
   based on the OTN topology.  Therefore the OTN tunnel model is usually
   used together with OTN topology model specified in
   [I-D.ietf-ccamp-otn-topo-yang].  The OTN tunnel model also imports a
   few type modules, including ietf-layer1-types, ietf-te-types and
   ietf-inet-types.  The OTN-specific attributes in [RFC7139], including
   the Tributary Slot (TS) and Tributary Port Number (TPN), can be used
   to represent the bandwidth and label information.  These attributes
   have been specified in [I-D.ietf-ccamp-layer1-types] and used in this
   document for augmentation of the generic TE tunnel model.

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

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

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].




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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
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        uint64
                +--:(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    uint64
     augment /te:te/te:tunnels/te:tunnel/te:te-bandwidth/te:technology:
       +--:(otn)
          +--rw otn
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        uint64
                +--:(cbr)
                |  +--rw client-type             identityref
                +--:(gfp-n-k)
                |  +--rw gfp-n                   uint8
                |  +--rw gfp-k?                  gfp-k
                +--:(flexe-client)



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                |  +--rw flexe-client            flexe-client-rate
                +--:(flexe-aware)
                |  +--rw flexe-aware-n           uint16
                +--:(packet)
                   +--rw opuflex-payload-rate    uint64
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:te-bandwidth/te:technology:
       +--:(otn)
          +--rw otn
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        uint64
                +--:(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    uint64
     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
             +--ro odu-type?                     identityref
             +--ro (oduflex-type)?
                +--:(generic)
                |  +--ro nominal-bit-rate        uint64
                +--:(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    uint64
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path/te:te-bandwidth
               /te:technology:



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       +--:(otn)
          +--rw otn
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        uint64
                +--:(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    uint64
     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
             +--ro odu-type?                     identityref
             +--ro (oduflex-type)?
                +--:(generic)
                |  +--ro nominal-bit-rate        uint64
                +--:(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    uint64
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:te-bandwidth/te:technology:
       +--:(otn)
          +--rw otn
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        uint64
                +--:(cbr)
                |  +--rw client-type             identityref



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                +--:(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    uint64
     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
             +--ro odu-type?                     identityref
             +--ro (oduflex-type)?
                +--:(generic)
                |  +--ro nominal-bit-rate        uint64
                +--:(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    uint64
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:te-bandwidth/te:technology:
       +--:(otn)
          +--rw otn
             +--rw odu-type?                     identityref
             +--rw (oduflex-type)?
                +--:(generic)
                |  +--rw nominal-bit-rate        uint64
                +--:(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    uint64
     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
             +--ro odu-type?                     identityref
             +--ro (oduflex-type)?
                +--:(generic)
                |  +--ro nominal-bit-rate        uint64
                +--:(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    uint64
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-in-segment
               /te:label-restrictions/te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-out-segment
               /te:label-restrictions/te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-out-segment



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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:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-in-segment/te:label-restrictions
               /te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:primary-reverse-path
               /te:path-out-segment/te:label-restrictions
               /te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-out-segment
               /te:label-restrictions/te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8
     augment /te:te/te:tunnels/te:tunnel/te:secondary-reverse-paths
               /te:secondary-reverse-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction:
       +--rw otn-label-range
          +--rw range-type?      otn-label-range-type
          +--rw tsg?             identityref
          +--rw odu-type-list*   identityref
          +--rw priority?        uint8



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     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-always
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn
             +--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-always
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn
             +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--rw ts?    otn-ts
     augment /te:te/te:globals/te:named-path-constraints
               /te:named-path-constraint/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-end
               /te:te-label/te:technology:
       +--:(otn)
          +--rw otn
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn



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                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:optimizations/te:algorithm/te:metric



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



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               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-end/te:te-label
               /te:technology:
       +--:(otn)
          +--rw otn
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:primary-paths
               /te:primary-path/te:path-in-segment/te:label-restrictions
               /te:label-restriction/te:label-step/te:technology:
       +--:(otn)
          +--rw otn
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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



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



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               /te:primary-path/te:primary-reverse-path
               /te:explicit-route-objects-always
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn
             +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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



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               /te:technology:
       +--:(otn)
          +--rw otn
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:optimizations/te:algorithm
               /te:metric/te:optimization-metric
               /te:explicit-route-exclude-objects
               /te:route-object-exclude-object/te:type/te:label
               /te:label-hop/te:te-label/te:technology:



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       +--:(otn)
          +--rw otn
             +--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
             +--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-always
               /te:route-object-exclude-always/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn
             +--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-always
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn
             +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--rw ts?    otn-ts
     augment /te:te/te:tunnels/te:tunnel/te:secondary-paths
               /te:secondary-path/te:path-in-segment
               /te:label-restrictions/te:label-restriction/te:label-end



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               /te:te-label/te:technology:
       +--:(otn)
          +--rw otn
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?



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



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               /te:explicit-route-objects-always
               /te:route-object-include-exclude/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--rw otn
             +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?



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                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--rw (range-type)?
                +--:(trib-port)
                |  +--rw tpn?   otn-tpn
                +--:(trib-slot)
                   +--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
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string
     augment /te:te/te:lsps/te:lsp/te:lsp-record-route-information
               /te:lsp-record-route-information/te:type/te:label
               /te:label-hop/te:te-label/te:technology:
       +--:(otn)
          +--ro otn
             +--ro tpn?       otn-tpn
             +--ro tsg?       identityref
             +--ro ts-list?   string







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4.  OTN Tunnel YANG Code

   <CODE BEGINS>
   file "ietf-otn-tunnel@2022-03-10.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";
       revision-date "2021-02-20";
       reference
         "I-D.ietf-teas-yang-te-19: A YANG Data Model for Traffic
         Engineering Tunnels and Interfaces. ";
     }

     import ietf-layer1-types {
       prefix "l1-types";
       reference
         "I-D.ietf-ccamp-layer1-types:
         A YANG Data Model for Layer 1 Types. ";
     }

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

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

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

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

        Editor:   Victor Lopez
                  <mailto:victor.lopezalvarez@telefonica.com>

        Editor:   Yunbin Xu
                  <mailto:xuyunbin@caict.ac.cn>";

     description
       "This module defines a model for OTN Tunnel Services.




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

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

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

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

     revision "2022-03-10" {
       description
         "Updated revision to align with the latest TE tunnel model.";
       reference
         "RFC XXXX: OTN Tunnel YANG Model";
       // RFC Ed.: replace XXXX with actual RFC number, update date
       // information and remove this note
     }

    /*
     * Data nodes
     */

     /*
      * Augment TE bandwidth
      */

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

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



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         uses l1-types:otn-path-bandwidth;
       }
     }

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

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

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

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



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         uses l1-types:otn-path-bandwidth;
       }
     }

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

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

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

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



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         uses l1-types:otn-path-bandwidth;
       }
     }

     /*
      * Augment TE label range information
      */

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

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

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



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           + "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/"
           + "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.";



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

     augment "/te:te/te:globals/te:named-path-constraints/"
           + "te:named-path-constraint/"
           + "te:explicit-route-objects-always/"
           + "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/"



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

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

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

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




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

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

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

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



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

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

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



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           + "te: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;
       }
     }

     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;
       }
     }



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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-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/"
           + "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/"



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

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:primary-paths/te:primary-path/"
           + "te:primary-reverse-path/"
           + "te:path-in-segment/te:label-restrictions/"
           + "te:label-restriction/te:label-start/"



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           + "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 {
         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;
       }



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     }

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



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

     augment "/te:te/te:tunnels/te:tunnel/"
           + "te:secondary-paths/te:secondary-path/"
           + "te:explicit-route-objects-always/"
           + "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 {



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

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

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

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



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         of the secondary path.";
       case otn {
         uses l1-types:otn-label-start-end;
       }
     }

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

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

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

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



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

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

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

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

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

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



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

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

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

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



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       }
     }

     augment "/te:te/te:lsps/"
           + "te:lsp/te:lsp-record-route-information/"
           + "te:lsp-record-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>

5.  Security Considerations

   The YANG module specified in this document defines a schema for data
   that is designed to be accessed via network management protocols such
   as NETCONF [RFC6241] or RESTCONF [RFC8040].  The lowest NETCONF layer
   is the secure transport layer, and the mandatory-to-implement secure
   transport is Secure Shell (SSH) [RFC6242].  The lowest RESTCONF layer
   is HTTPS, and the mandatory-to-implement secure transport is TLS
   [RFC8446].

   The NETCONF access control model [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 may be considered sensitive or vulnerable
   in some network environments.  Write operations (e.g., edit-config)
   to these data nodes without proper protection can have a negative
   effect on network operations.  Considerations in Section 10 of
   [I-D.ietf-teas-yang-te]are also applicable to their subtrees in the
   module defined in this document.

   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.  Considerations in Section 10 of
   [I-D.ietf-teas-yang-te]are also applicable to their subtrees in the
   module defined in this document.





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6.  IANA Considerations

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


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


   This document registers following YANG modules in the YANG Module
   Names registry [RFC7950].


      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.

7.  Acknowledgements

   TBD.

8.  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: zhang.xian@huawei.com

   Lei Wang China Mobile Email: wangleiyj@chinamobile.com

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



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9.  References

9.1.  Normative References

   [I-D.ietf-ccamp-layer1-types]
              Zheng, H. and I. Busi, "A YANG Data Model for Layer 1
              Types", Work in Progress, Internet-Draft, draft-ietf-
              ccamp-layer1-types-13, 8 April 2022,
              <https://www.ietf.org/archive/id/draft-ietf-ccamp-layer1-
              types-13.txt>.

   [I-D.ietf-ccamp-otn-topo-yang]
              Zheng, H., Busi, I., Liu, X., Belotti, S., and O. G. D.
              Dios, "A YANG Data Model for Optical Transport Network
              Topology", Work in Progress, Internet-Draft, draft-ietf-
              ccamp-otn-topo-yang-14, 7 March 2022,
              <https://www.ietf.org/archive/id/draft-ietf-ccamp-otn-
              topo-yang-14.txt>.

   [I-D.ietf-teas-yang-te]
              Saad, T., Gandhi, R., Liu, X., Beeram, V. P., Bryskin, I.,
              and O. G. D. Dios, "A YANG Data Model for Traffic
              Engineering Tunnels, Label Switched Paths and Interfaces",
              Work in Progress, Internet-Draft, draft-ietf-teas-yang-te-
              29, 7 February 2022, <https://www.ietf.org/archive/id/
              draft-ietf-teas-yang-te-29.txt>.

   [ITU-Tg709]
              International Telecommunication Union, "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/info/rfc3688>.

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

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
              <https://www.rfc-editor.org/info/rfc6242>.








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   [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/info/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/info/rfc7950>.

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

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

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

   [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/info/rfc8446>.

9.2.  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-14, 25 March 2022,
              <https://www.ietf.org/archive/id/draft-ietf-ccamp-
              transport-nbi-app-statement-14.txt>.

   [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-09, 7 March
              2022, <https://www.ietf.org/archive/id/draft-ietf-teas-
              actn-yang-09.txt>.






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   [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/info/rfc8340>.

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
   HUAWEI TECHNOLOGIES ITALIA Srl Centro Direzionale Milano 2
   20090 Milan Milan
   Italy
   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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