YANG data model for Flexi-Grid media-channels
draft-ietf-ccamp-flexigrid-media-channel-yang-01
Document Type Active Internet-Draft (ccamp WG)
Last updated 2018-10-22
Replaces draft-vergara-ccamp-flexigrid-media-channel-yang
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CCAMP Working Group                              J.E. Lopez de Vergara
Internet Draft                          Universidad Autonoma de Madrid
Intended status: Standards Track                           D. Perdices
Expires: April 25, 2019                                    Naudit HPCN
                                                              V. Lopez
                                                   O. Gonzalez de Dios
                                                   Telefonica I+D/GCTO
                                                               D. King
                                                  Lancaster University
                                                                Y. Lee
                                                                Huawei
                                                         G. Galimberti
                                                   Cisco Photonics Srl
                                                      October 22, 2018

           YANG data model for Flexi-Grid media-channels
       draft-ietf-ccamp-flexigrid-media-channel-yang-01.txt

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   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on April 25, 2019.   

Copyright Notice

   Copyright (c) 2018 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document. Please review these documents

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   carefully, as they describe your rights and restrictions with
   respect to this document. Code Components extracted from this
   document must include Simplified BSD License text as described in
   Section 4.e of the Trust Legal Provisions and are provided without
   warranty as described in the Simplified BSD License.

Abstract

   This document defines a YANG model for managing flexi-grid optical
   media channels, complementing the information provided by the
   flexi-grid TED model.
   It is also grounded on other defined YANG abstract models.

Table of Contents

   1.  Introduction ..............................................  2
   2.  Conventions used in this document .........................  3
   3.  Flexi-grid media-channel overview .........................  3
   4.  Example of use ............................................  4
   5.  Media Channel YANG Model ..................................  5
       5.1. YANG Model - Tree ....................................  5
       5.2. YANG Model - Code .................................... 20
       5.3. License .............................................. 41
   6.  Security Considerations ................................... 42
   7.  IANA Considerations ....................................... 42
   8.  References ................................................ 42
       8.1. Normative References ................................. 42
       8.2. Informative References ............................... 43
   9.  Contributors .............................................. 43
   10. Acknowledgments ........................................... 43
   Authors' Addresses ............................................ 43

1. Introduction

   Transport networks are evolving from current DWDM systems towards
   elastic optical networks, based on flexi-grid transmission and
   switching technologies [RFC7698]. Such technology aims at increasing
   both transport network scalability and flexibility, allowing the
   optimization of bandwidth usage.

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   While [I-D.draft-ietf-ccamp-flexigrid-yang] focuses on flexi-grid
   objects such as nodes, transponders and links, this document presents
   a YANG model for the flexi-grid media-channel. This YANG module
   defines the whole path from a source transponder or node to the
   destination through a number of intermediate nodes in the flexi-grid
   network.

   This document identifies the flexi-grid media-channel components,
   parameters and their values, characterizes the features and the
   performances of the flexi-grid elements. An application example is
   provided towards the end of the document to better understand
   their utility.

2. Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

   In this document, these words will appear with that interpretation
   only when in ALL CAPS. Lower case uses of these words are not to be
   interpreted as carrying RFC-2119 significance.

   In this document, the characters ">>" preceding an indented line(s)
   indicates a compliance requirement statement using the key words
   listed above. This convention aids reviewers in quickly identifying
   or finding the explicit compliance requirements of this RFC.

3. Flexi-grid media-channel overview

   The present model defines a flexi-grid media-channel mainly
   composed of:
      - source address
      - source flexi-grid port
      - source flexi-grid transponder
      - destination address
      - destination flexi-grid port
      - destination flexi-grid transponder
      - A list of links that defines the path
      - Other optical attributes

    Each path can be a media-channel (only defined by source and
    destination node) or a network media-channel (additionally needs
    source and destination transponders). Therefore, all the attributes
    are optional to support both situations.

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    This is achieved by a combination of the traffic engineering tunnel
    attributes explained in [I-D.draft-ietf-teas-yang-te] and augments
    when necessary. For instance, source address, source flexi-grid
    transponder, destination address and destination flexi-grid
    transponder attributes are directly taken from tunnel, whereas other
    attributes such as source flexi-grid port, destination flexi-grid
    port are defined, as they are specific for flexi-grid.

4. Example of use

   In order to explain how this model is used, we provide the following
   example. An optical network usually has multiple transponders,
   switches (nodes) and links between them. Figure 1 shows a simple
   topology, where two physical paths interconnect two optical
   transponders.
                               Media channel
            <==================================================>
                                  Path x
            <-------------------------------------------------->

                     +----------+          +----------+
              Link 1 |Flexi-grid|  Link 2  |Flexi-grid| Link 3
                .--->|   node   |<-------->|   node   |<---.
                |    |    B     |          |    C     |    |
                |    +----------+          +----------+    |
                v                                          v
             /-----------\                       /-----------\
            / Flexi-grid  \                     / Flexi-grid  \
            | transponder |                     | transponder |
            \      A      /                     \      E      /
             \-----------/                       \-----------/
                  ^                                     ^
                  |             +----------+            |
                  |    Link 4   |Flexi-grid|   Link 5   |
                  '------------>|   node   |<-----------'
                                |    D     |
                                +----------+
            <-------------------------------------------------->
                                  Path y

                      Figure 1. Topology example.

   After the nodes, links and transponders have been defined using
   [I-D.draft-ietf-ccamp-flexigrid-yang], we can configure the
   media-channel from the information we have stored in the
   flexi-grid TED, by querying which elements are available, and
   planning the resources that have to be provided on each situation.
   Note that every element in the flexi-grid TED has a reference, and
   this is the way in which they are called in the media-channel.

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   1. Depending on the case, it is possible to define either the source
      and destination node ports, or the source and destination node
      and transponder. In our case, we would define a network media
      channel, with source transponder A and source node B, and
      destination transponder E and destination node C. Thus, we are
      going to follow path x.

   2. Then, for each link in the path x, we indicate which channel we
      are going to use, providing information about the slots, and what
      nodes are connected.

   3. Finally, the flexi-grid TED has to be updated with each element
      usage status each time a media channel is created or torn down.

5. Media Channel YANG Model

5.1. YANG Model - Tree

module: ietf-flex-grid-media-channel
  augment /te:te/te:tunnels/te:tunnel:
    +--rw src-client-signal?   identityref
    +--rw dst-client-signal?   identityref
    +--rw fec-type?            identityref
    +--rw termination-type?    identityref
    +--rw bit-stuffing?        boolean
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:te-bandwidth/te:technology:
    +--:(flex-grid)
       +--rw bandwidth-type?   identityref
  augment /te:te/te:tunnels/te:tunnel/te:te-bandwidth/te:technology:
    +--:(flex-grid)
       +--rw bandwidth-type?   identityref
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:te-bandwidth/te:technology:
    +--:(flex-grid)
       +--rw bandwidth-type?   identityref
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/te:te-bandwidth/
    te:technology:
    +--:(flex-grid)
       +--rw bandwidth-type?   identityref
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:te-bandwidth/te:technology:
    +--:(flex-grid)
       +--rw bandwidth-type?   identityref

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  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:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  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:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-in-segment/te:forward/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-in-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-in-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz

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  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-in-segment/te:reverse/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-in-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-in-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-out-segment/te:forward/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-out-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-out-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-out-segment/te:reverse/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz

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  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-out-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:globals/te:named-path-constraints/
    te:named-path-constraint/te:path-out-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-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:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-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:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz

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  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:explicit-route-objects/
    te:route-object-exclude-always/te:type/te:label/te:label-hop/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:explicit-route-objects/
    te:route-object-include-exclude/te:type/te:label/te:label-hop/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-in-segment/te:forward/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-in-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-in-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
           
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  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-in-segment/te:reverse/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-in-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-in-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-out-segment/te:forward/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-out-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-out-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-out-segment/te:reverse/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz

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  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-out-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:path-out-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:state/te:path-properties/
    te:path-route-objects/te:path-computed-route-object/te:state/
    te:type/te:label/te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--ro (single-or-super-channel)?
          +--:(single)
          |  +--ro central-frequency?     frequency-thz
          |  +--ro slot-width?            frequency-ghz
          +--:(super)
             +--ro subcarrier-channels* [central-frequency]
                +--ro central-frequency     frequency-thz
                +--ro slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:state/te:lsps/te:lsp/
    te:lsp-record-route-subobjects/te:record-route-subobject/te:type/
    te:label/te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--ro (single-or-super-channel)?
          +--:(single)
          |  +--ro central-frequency?     frequency-thz
          |  +--ro slot-width?            frequency-ghz
          +--:(super)
             +--ro subcarrier-channels* [central-frequency]
                +--ro central-frequency     frequency-thz
                +--ro slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:state/te:lsps/te:lsp/te:path-properties/
    te:path-route-objects/te:path-computed-route-object/te:state/
    te:type/te:label/te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--ro (single-or-super-channel)?
          +--:(single)
          |  +--ro central-frequency?     frequency-thz
          |  +--ro slot-width?            frequency-ghz
          +--:(super)
             +--ro subcarrier-channels* [central-frequency]
                +--ro central-frequency     frequency-thz
                +--ro slot-width?           frequency-ghz

Lopez de Vergara, et al.        Expires April 25, 2019         [Page 11]

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  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-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:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-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:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:explicit-route-objects/te:route-object-exclude-always/
    te:type/te:label/te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz

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  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:explicit-route-objects/te:route-object-include-exclude/
    te:type/te:label/te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:path-in-segment/te:forward/te:label-restrictions/
    te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/te:path-in-segment/
    te:forward/te:label-restrictions/te:label-restriction/
    te:label-start/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/te:path-in-segment/
    te:forward/te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:path-in-segment/te:reverse/te:label-restrictions/
    te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:path-in-segment/te:reverse/te:label-restrictions/
    te:label-restriction/te:label-start/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz

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  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:path-in-segment/te:reverse/te:label-restrictions/
    te:label-restriction/te:label-end/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:path-out-segment/te:forward/te:label-restrictions/
    te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:path-out-segment/te:forward/te:label-restrictions/
    te:label-restriction/te:label-start/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:path-out-segment/te:forward/te:label-restrictions/
    te:label-restriction/te:label-end/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:path-out-segment/te:reverse/te:label-restrictions/
    te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:path-out-segment/te:reverse/te:label-restrictions/
    te:label-restriction/te:label-start/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:path-out-segment/te:reverse/te:label-restrictions/
    te:label-restriction/te:label-end/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz

Lopez de Vergara, et al.        Expires April 25, 2019         [Page 14]

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  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:state/te:path-properties/te:path-route-objects/
    te:path-computed-route-object/te:state/te:type/te:label/
    te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--ro (single-or-super-channel)?
          +--:(single)
          |  +--ro central-frequency?     frequency-thz
          |  +--ro slot-width?            frequency-ghz
          +--:(super)
             +--ro subcarrier-channels* [central-frequency]
                +--ro central-frequency     frequency-thz
                +--ro slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/te:state/te:lsps/
    te:lsp/te:lsp-record-route-subobjects/te:record-route-subobject/
    te:type/te:label/te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--ro (single-or-super-channel)?
          +--:(single)
          |  +--ro central-frequency?     frequency-thz
          |  +--ro slot-width?            frequency-ghz
          +--:(super)
             +--ro subcarrier-channels* [central-frequency]
                +--ro central-frequency     frequency-thz
                +--ro slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-primary-paths/
    te:p2p-primary-path/te:p2p-reverse-primary-path/
    te:state/te:lsps/te:lsp/te:path-properties/te:path-route-objects/
    te:path-computed-route-object/te:state/te:type/te:label/
    te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--ro (single-or-super-channel)?
          +--:(single)
          |  +--ro central-frequency?     frequency-thz
          |  +--ro slot-width?            frequency-ghz
          +--:(super)
             +--ro subcarrier-channels* [central-frequency]
                +--ro central-frequency     frequency-thz
                +--ro slot-width?           frequency-ghz

Lopez de Vergara, et al.        Expires April 25, 2019         [Page 15]

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  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-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:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-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:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:explicit-route-objects/
    te:route-object-exclude-always/te:type/te:label/
    te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz

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  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:explicit-route-objects/
    te:route-object-include-exclude/te:type/te:label/
    te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--rw (single-or-super-channel)?
          +--:(single)
          |  +--rw central-frequency?     frequency-thz
          |  +--rw slot-width?            frequency-ghz
          +--:(super)
             +--rw subcarrier-channels* [central-frequency]
                +--rw central-frequency     frequency-thz
                +--rw slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-in-segment/te:forward/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-in-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-in-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-in-segment/te:reverse/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-in-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz

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  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-in-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-out-segment/te:forward/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-out-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-out-segment/te:forward/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-out-segment/te:reverse/
    te:label-restrictions/te:label-restriction:
    +--rw grid-type?   identityref
    +--rw priority?    uint8
    +--rw flex-grid
       +--rw nominal-central-frequency-granularity?   frequency-ghz
       +--rw slot-width-granularity?                  frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-out-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-start/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:path-out-segment/te:reverse/
    te:label-restrictions/te:label-restriction/te:label-end/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--rw central-frequency?   frequency-thz

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  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:state/te:path-properties/
    te:path-route-objects/te:path-computed-route-object/
    te:state/te:type/te:label/te:label-hop/te:te-label/
    te:technology:
    +--:(flex-grid)
       +--ro (single-or-super-channel)?
          +--:(single)
          |  +--ro central-frequency?     frequency-thz
          |  +--ro slot-width?            frequency-ghz
          +--:(super)
             +--ro subcarrier-channels* [central-frequency]
                +--ro central-frequency     frequency-thz
                +--ro slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:state/te:lsps/te:lsp/
    te:lsp-record-route-subobjects/te:record-route-subobject/
    te:type/te:label/te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--ro (single-or-super-channel)?
          +--:(single)
          |  +--ro central-frequency?     frequency-thz
          |  +--ro slot-width?            frequency-ghz
          +--:(super)
             +--ro subcarrier-channels* [central-frequency]
                +--ro central-frequency     frequency-thz
                +--ro slot-width?           frequency-ghz
  augment /te:te/te:tunnels/te:tunnel/te:p2p-secondary-paths/
    te:p2p-secondary-path/te:state/te:lsps/te:lsp/
    te:path-properties/te:path-route-objects/
    te:path-computed-route-object/te:state/te:type/te:label/
    te:label-hop/te:te-label/te:technology:
    +--:(flex-grid)
       +--ro (single-or-super-channel)?
          +--:(single)
          |  +--ro central-frequency?     frequency-thz
          |  +--ro slot-width?            frequency-ghz
          +--:(super)
             +--ro subcarrier-channels* [central-frequency]
                +--ro central-frequency     frequency-thz
                +--ro slot-width?           frequency-ghz

Lopez de Vergara, et al.        Expires April 25, 2019         [Page 19]

Internet-Draft  YANG data model for Flexi-Grid media-channels  Oct.2018

  augment /te:te/te:lsps-state/te:lsp/te:lsp-record-route-subobjects/
    te:record-route-subobject/te:type/te:label/te:label-hop/
    te:te-label/te:technology:
    +--:(flex-grid)
       +--ro (single-or-super-channel)?
          +--:(single)
          |  +--ro central-frequency?     frequency-thz
          |  +--ro slot-width?            frequency-ghz
          +--:(super)
             +--ro subcarrier-channels* [central-frequency]
                +--ro central-frequency     frequency-thz
                +--ro slot-width?           frequency-ghz
  augment /te:tunnels-rpc/te:input/te:tunnel-info/tepc:path-request:
    +---- src-client-signal?       identityref
    +---- dst-client-signal?       identityref
    +---- fec-type?                identityref
    +---- termination-type?        identityref
    +---- bit-stuffing?            boolean
    +---- wavelength-assignment?   identityref

5.2. YANG Model - Code

<CODE BEGINS> file "ietf-flexi-grid-media-channel@2018-10-22.yang"

module ietf-flex-grid-media-channel {
  yang-version 1.1;

  namespace "urn:ietf:params:xml:ns:yang:ietf-flex-grid-media-channel";
  prefix "flex-grid-tunnel";

  import ietf-te { prefix "te"; }
  import ietf-layer0-types{ prefix "layer0-types"; }
  import ietf-te-path-computation { prefix "tepc"; }
  import ietf-otn-types { prefix "otn-types"; }

  organization
    "IETF CCAMP Working Group";

  contact
    "WG Web:   <http://tools.ietf.org/wg/ccamp/>
     WG List:  <mailto:ccamp@ietf.org>

     WG Chair: Daniele Ceccarelli
               <mailto:daniele.ceccarelli@ericsson.com>

     WG Chair: Fatai Zhang
               <mailto:zhangfatai@huawei.com>

     Editor: Jorge E. Lopez de Vergara <jorge.lopez_vergara@uam.es>
     Editor: Daniel Perdices Burrero <daniel.perdices@naudit.es>
     Editor: Victor Lopez Alvarez <victor.lopezalvarez@telefonica.com>
     Editor: Young Lee <leeyoung@huawei.com>";

Lopez de Vergara, et al.        Expires April 25, 2019         [Page 20]

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     description
       "This module defines a model for Flex-grid Tunnel Services.";

  revision "2018-10-22" {
    description
      "version 1";
    reference "version 1";
  }

  /* Groupings. */

  grouping flex-grid-tunnel-attributes {
    description "Parameters for flexgrid tunnel.";

    leaf src-client-signal {
      type identityref {
        base otn-types:client-signal;
      }
      description
        "Client signal at the source endpoint of
         the tunnel.";
    }

    leaf dst-client-signal {
      type identityref {
        base otn-types:client-signal;
      }
      description
        "Client signal at the destination endpoint of
         the tunnel.";
    }

    leaf fec-type {
      type identityref {
        base layer0-types:fec-type;
      }
      description
        "FEC type.";
    }

    leaf termination-type {
      type identityref {
        base layer0-types:term-type;
      }
      description
        "Termination type.";
    }

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    leaf bit-stuffing {
      type boolean;
      description
        "Bit stuffing enabled/disabled.";
    }
  }

  grouping flex-grid-path-constraints {
    description
      "Global named path constraints configuration
       grouping for flexi-grid tunnel";
         
    leaf wavelength-assignment {
      type identityref {
        base layer0-types:wavelength-assignment;
      }
      description "Wavelength Allocation Method";
    }
  }

 /*
  * Data nodes
  */

  augment "/te:te/te:tunnels/te:tunnel" {
    description
      "Augment with additional parameters required for flex-grid
       tunnel.";
    uses flex-grid-tunnel-attributes;
  }

  /*
   * Augment TE bandwidth
   */

  /* Augment bandwidth of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/"
        + "te:te-bandwidth/te:technology" {
    description "flex-grid bandwidth.";
    case flex-grid {
      uses layer0-types:flex-grid-path-bandwidth;
    }
  }

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  /* Augment bandwdith of tunnel */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:te-bandwidth/te:technology" {
    description "flex-grid bandwidth.";
    case flex-grid {
      uses layer0-types:flex-grid-path-bandwidth;
    }
  }

  /* Augment bandwidth of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:te-bandwidth/te:technology" {
    description "flex-grid bandwidth.";
    case flex-grid {
      uses layer0-types:flex-grid-path-bandwidth;
    }
  }

  /* Augment bandwidth of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:te-bandwidth/te:technology" {
    description "flex-grid bandwidth.";
    case flex-grid {
      uses layer0-types:flex-grid-path-bandwidth;
    }
  }

  /* Augment bandwidht of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:te-bandwidth/te:technology" {
    description "flex-grid bandwidth.";
    case flex-grid {
      uses layer0-types:flex-grid-path-bandwidth;
    }
  }

  /*
   * Augment TE label.
   */

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  /* Augment label hop of route-object-exclude-always of
     named-path-constraints */
  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 "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

  /* Augment label hop of route-object-include-exclude of 
     named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:explicit-route-objects/"
        + "te:route-object-include-exclude/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

  /* Augment label restrictions for the forwarding direction of 
     path-in-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-in-segment/"
        + "te:forward/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }

  /* Augment label restrictions start for the forwarding direction of 
     path-in-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-in-segment/"
        + "te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

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  /* Augment label restrictions end for the forwarding direction of 
     path-in-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-in-segment/"
        + "te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

  /* Augment label restrictions for the reverse direction of 
     path-in-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-in-segment/"
        + "te:reverse/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }

  /* Augment label restrictions start for the reverse direction of 
     path-in-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-in-segment/"
        + "te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

  /* Augment label restrictions end for the reverse direction of 
     path-in-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-in-segment/"
        + "te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

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  /* Augment label restrictions for the forwarding direction of 
     path-out-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-out-segment/"
        + "te:forward/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the forwarding direction of 
     path-out-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-out-segment/"
        + "te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions end for the forwarding direction of 
     path-out-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-out-segment/"
        + "te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions for the reverse direction of 
     path-out-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-out-segment/"
        + "te:reverse/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the reverse direction of 
     path-out-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-out-segment/"
        + "te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

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  /* Augment label restrictions end for the reverse direction of 
     path-out-segment of named-path-constraints */
  augment "/te:te/te:globals/te:named-path-constraints/"
        + "te:named-path-constraint/te:path-out-segment/"
        + "te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

  /* Augment label hop of route-exclude of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-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 "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

  /* Augment label hop of route-include of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-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 "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

  /* Augment label hop of route-object-exclude-always of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:explicit-route-objects/"
        + "te:route-object-exclude-always/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

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  /* Augment label hop of route-object-include-exclude of primary path 
   */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:explicit-route-objects/"
        + "te:route-object-include-exclude/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label restrictions for the forwarding direction of 
     path-in-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-in-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the forwarding direction of 
     path-in-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-in-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions end for the forwarding direction of 
     path-in-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-in-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions for the reverse direction of 
     path-in-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-in-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }

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  /* Augment label restrictions start for the reverse direction of 
     path-in-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-in-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions end for the reverse direction of 
     path-in-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-in-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions for the forwarding direction of 
     path-out-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-out-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the forwarding direction of 
     path-out-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-out-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

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  /* Augment label restrictions end for the forwarding direction of 
     path-out-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-out-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions for the reverse direction of 
     path-out-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-out-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the reverse direction of 
     path-out-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-out-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions end for the reverse direction of 
     path-out-segment of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:path-out-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

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  /* Augment label hop of path-route of primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:state/te:path-properties/"
        + "te:path-route-objects/te:path-computed-route-object/"
        + "te:state/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label hop of record-route of primary LSP */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:state/te:lsps/te:lsp/te:lsp-record-route-subobjects/"
        + "te:record-route-subobject/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label hop of path-route of primary LSP */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:state/te:lsps/te:lsp/te:path-properties/"
        + "te:path-route-objects/te:path-computed-route-object/"
        + "te:state/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label hop of route-exclude of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-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 "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

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  /* Augment label hop of route-include of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-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 "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label hop of route-object-exclude-always of reverse 
     primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:explicit-route-objects/"
        + "te:route-object-exclude-always/"
        + "te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

  /* Augment label hop of route-object-include-exclude of reverse 
     primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:explicit-route-objects/"
        + "te:route-object-include-exclude/"
        + "te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

  /* Augment label restrictions for the forwarding direction of 
     path-in-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-in-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }

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  /* Augment label restrictions start for the forwarding direction of 
     path-in-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-in-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions end for the forwarding direction of 
     path-in-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-in-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions for the reverse direction of 
     path-in-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-in-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the reverse direction of 
     path-in-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-in-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
 
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 /* Augment label restrictions end for the reverse direction of 
     path-in-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-in-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions for the forwarding direction of 
     path-out-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-out-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the forwarding direction of 
     path-out-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-out-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions end for the forwarding direction of 
     path-out-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-out-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

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  /* Augment label restrictions for the reverse direction of 
     path-out-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-out-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the reverse direction of 
     path-out-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-out-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions end for the reverse direction of 
     path-out-segment of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:path-out-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label hop of path-route of reverse primary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:state/te:path-properties/"
        + "te:path-route-objects/te:path-computed-route-object/"
        + "te:state/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

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  /* Augment label hop of record-route of reverse primary LSP */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:state/te:lsps/te:lsp/te:lsp-record-route-subobjects/"
        + "te:record-route-subobject/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label hop of path-route of reverse primary LSP */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-primary-paths/te:p2p-primary-path/"
        + "te:p2p-reverse-primary-path/"
        + "te:state/te:lsps/te:lsp/te:path-properties/"
        + "te:path-route-objects/te:path-computed-route-object/"
        + "te:state/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label hop of route-exclude of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-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 "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label hop of route-include of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-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 "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

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  /* Augment label hop of route-object-exclude-always of secondary path 
   */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:explicit-route-objects/"
        + "te:route-object-exclude-always/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label hop of route-object-include-exclude of secondary 
     path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:explicit-route-objects/"
        + "te:route-object-include-exclude/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label restrictions for the forwarding direction of 
     path-in-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-in-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the forwarding direction of 
     path-in-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-in-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

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  /* Augment label restrictions end for the forwarding direction of 
     path-in-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-in-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions for the reverse direction of 
     path-in-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-in-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the reverse direction of 
     path-in-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-in-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions end for the reverse direction of 
     path-in-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-in-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }

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  /* Augment label restrictions for the forwarding direction of 
     path-out-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-out-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }
  /* Augment label restrictions start for the forwarding direction of 
     path-out-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-out-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
 /* Augment label restrictions end for the forwarding direction of 
    path-out-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-out-segment/te:forward/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions for the reverse direction of 
     path-out-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-out-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction" {
    description "flex-grid label.";
    uses layer0-types:flex-grid-label-restriction;
  }

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  /* Augment label restrictions start for the reverse direction of 
     path-out-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-out-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-start/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label restrictions end for the reverse direction of 
     path-out-segment of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:path-out-segment/te:reverse/te:label-restrictions/"
        + "te:label-restriction/te:label-end/"
        + "te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-link-label;
    }
  }
  /* Augment label hop of path-route of secondary path */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:state/te:path-properties/te:path-route-objects/"
        + "te:path-computed-route-object/te:state/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label hop of record-route of secondary LSP */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:state/te:lsps/te:lsp/te:lsp-record-route-subobjects/"
        + "te:record-route-subobject/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }

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  /* Augment label hop of path-route of secondary LSP */
  augment "/te:te/te:tunnels/te:tunnel/"
        + "te:p2p-secondary-paths/te:p2p-secondary-path/"
        + "te:state/te:lsps/te:lsp/te:path-properties/"
        + "te:path-route-objects/"
        + "te:path-computed-route-object/te:state/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }
  /* Augment label hop of record-route of LSP */
  augment "/te:te/te:lsps-state/"
        + "te:lsp/te:lsp-record-route-subobjects/"
        + "te:record-route-subobject/te:type/te:label/"
        + "te:label-hop/te:te-label/te:technology" {
    description "flex-grid label.";
    case flex-grid {
      uses layer0-types:flex-grid-path-label;
    }
  }     
  augment "/te:tunnels-rpc/te:input/te:tunnel-info/"
        + "tepc:path-request" {
    description 
       "Augment with additional constraints flex-grid
        tunnel.";
    uses flex-grid-tunnel-attributes;
    uses flex-grid-path-constraints;
  }
}

<CODE ENDS>

5.3. License

   Copyright (c) 2018 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, are permitted provided that the following conditions
   are met:

   o Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.

   o Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the
      distribution.

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   o Neither the name of Internet Society, IETF or IETF Trust, nor the
      names of specific contributors, may be used to endorse or promote
      products derived from this software without specific prior
      written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGE.
      
6. Security Considerations

   The transport protocol used for sending the managed information MUST
   support authentication and SHOULD support encryption.

   The defined data-model by itself does not create any security
   implications.

7. IANA Considerations

   The namespace used in the defined models is currently based on the
   METRO-HAUL project URI. Future versions of this document could
   register a URI in the IETF XML registry [RFC3688], as well as in the
   YANG Module Names registry [RFC6020].

8. References

8.1. Normative References

   [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
             Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
             the Network Configuration Protocol (NETCONF)", RFC 6020,
             October 2010.

   [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
             January 2004.

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8.2. Informative References

   [RFC7698] Gonzalez de Dios, O., Casellas, R., Eds. "Framework and
             Requirements for GMPLS-Based Control of Flexi-Grid Dense
             Wavelength Division Multiplexing (DWDM) Networks",
             RFC7698, November 2015.
   [I-D.draft-ietf-ccamp-flexigrid-yang] Lopez de Vergara, J.,
          Perdices, D., Lopez, V., Gonzalez de Dios, O.,  King, D.,
          Lee, Y., Galimberti, G., "YANG data model for Flexi-Grid
          Optical Networks", Internet Draft,
          draft-ietf-ccamp-flexigrid-yang-02, 2018.
   [I-D.draft-ietf-teas-yang-te]
          Saad, T., Gandhi, R., Liu, X., Beeram, V., Shah, H.,
          Bryskin, I., Chen, X., Jones, R., and B. Wen, "A YANG Data
          Model for Traffic Engineering Tunnels and Interfaces",
          draft-ietf-teas-yang-te-17, 2018.

9. Contributors

   The model presented in this paper was contributed to by more people
   than can be listed on the author list.  Additional contributors
   include:

   o Zafar Ali, Cisco Systems
   o Daniel Michaud Vallinoto, Universidad Autonoma de Madrid

10. Acknowledgments

   The work presented in this Internet-Draft has been partially funded
   by the European Commission under the project H2020 METRO-HAUL
   (Metro High bandwidth, 5G Application-aware optical network, with
   edge storage, compUte and low Latency), Grant Agreement number:
   761727, and by the Spanish Ministry of Economy and Competitiveness
   under the project TRAFICA, MINECO/FEDER TEC2015-69417-C2-1-R.

Authors' Addresses

   Jorge E. Lopez de Vergara
   Universidad Autonoma de Madrid
   Escuela Politecnica Superior
   C/Francisco Tomas y Valiente, 11
   E-28049 Madrid, Spain

   Email: jorge.lopez_vergara@uam.es

   Daniel Perdices Burrero
   Naudit High Performance Computing and Networking, S.L.
   C/Faraday, 7
   E-28049 Madrid, Spain

   Email: daniel.perdices@naudit.es

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   Victor Lopez
   Telefonica I+D/GCTO
   Distrito Telefonica
   E-28050 Madrid, Spain

   Email: victor.lopezalvarez@telefonica.com

   Oscar Gonzalez de Dios
   Telefonica I+D/GCTO
   Distrito Telefonica
   E-28050 Madrid, Spain

   Email: oscar.gonzalezdedios@telefonica.com

   Daniel King
   Lancaster University

   Email: d.king@lancaster.ac.uk

   Young Lee
   Huawei Technologies

   Email: leeyoung@huawei.com

   Gabriele Galimberti
   Cisco Photonics Srl

   Email: ggalimbe@cisco.com

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