CCAMP Working Group                                  J. Lopez de Vergara
Internet-Draft                            Universidad Autonoma de Madrid
Intended status: Informational                       D. Perdices Burrero
Expires: March 26, 2021                                           Naudit
                                                                 D. King
                                                      Old Dog Consulting
                                                                  Y. Lee
                                                                 Samsung
                                                                H. Zheng
                                                     Huawei Technologies
                                                      September 22, 2020


           A YANG Data Model for Flexi-Grid Optical Networks
                   draft-ietf-ccamp-flexigrid-yang-07

Abstract

   This document defines a YANG module for managing flexi-grid optical
   networks.  The model defined in this document specifies a flexi-grid
   traffic engineering database that is used to describe the topology of
   a flexi-grid network.  It is based on and augments existing YANG
   models that describe network and traffic engineering topologies.

   A partner document defines a second YANG module for flexi-grid media
   channels, i.e., the paths from source to destination through a number
   of intermediate nodes.

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 March 26, 2021.







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Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Tree Diagram  . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Prefixes in Data Node Names . . . . . . . . . . . . . . .   4
   5.  Main Components of the Flexi-grid Topology  . . . . . . . . .   5
   6.  Example of Use  . . . . . . . . . . . . . . . . . . . . . . .  11
   7.  YANG Model (Tree Structure) for Flexi-grid topology . . . . .  13
   8.  The YANG Code for Flexi-grid topology . . . . . . . . . . . .  30
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  64
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  65
   11. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  65
   12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  66
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  67
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  67
     13.2.  Informative References . . . . . . . . . . . . . . . . .  68
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  69

1.  Introduction

   The flexible grid (flexi-grid) optical network technology defined by
   the International Telecommunication Union Telecommunication
   Standardization Sector (ITU-T) and documented in Recommendation
   G.694.1 [G.694.1] and G.872 [G.872] provides an enhanced Dense
   Wavelength Division Multiplexing (DWDM) grid by defining a set of
   nominal central frequencies, channel spacings, and the concept of the
   "frequency slot".  In such an environment, a data-plane connection is
   switched based on allocated, variable-sized frequency ranges within
   the optical spectrum, creating what is known as a flexible grid
   (flexi-grid).  This technology increases both transport network




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   scalability and flexibility, allowing the optimization of bandwidth
   usage.

   [RFC7698] provides a framework GMPLS-Based control of flexi-grid DWDM
   networks while [RFC7699] defines generalized labels for the use in
   flexi-grid in GMPLS networks.

   This document presents a YANG [RFC7950] model for flexi-grid objects
   in the dynamic optical network, including the nodes, transponders and
   links between them, as well as how such links interconnect nodes and
   transponders.

   The YANG model for flexi-grid networks allows the representation of
   the flexi-grid optical layer of a network, combined with the
   underlying physical layer.

   This document identifies the flexi-grid 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.

   A partner document defines a second YANG module that described flexi-
   grid tunnels, i.e., the paths from source to destination through a
   number of intermediate nodes
   [I-D.ietf-ccamp-flexigrid-media-channel-yang].

2.  Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Terminology

   Refer to [RFC7446] and [RFC7581] for the key terms used in this
   document.

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

   o  client

   o  server

   o  augment




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   o  data model

   o  data node

   The following terms are defined in [RFC6241] and are not redefined
   here:

   o  configuration data

   o  state data

   The terminology for describing YANG data models is found in
   [RFC7950].

4.  Tree Diagram

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

4.1.  Prefixes 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 Figure 1.  It uses
   prefixes from [I-D.ietf-ccamp-layer0-types], [RFC8345], and
   [RFC8795].


         +-------------+-------------------------+-----------------+
         | Prefix      | YANG module             | Reference       |
         +-------------+-------------------------+-----------------+
         | l0-types    | ietf-layer0-types       | [RFCXXXX]       |
         | flexi-grid  | ietf-flexi-grid-topology| [RFCYYYY]       |
         | nw          | ietf-network            | [RFC8345]       |
         | nt          | ietf-network-topology   | [RFC8345]       |
         | tet         | ietf-te-topology        | [RFC8795]       |
         +-------------+-------------------------+-----------------+


             Figure 1: Prefixes and Corresponding YANG modules

   RFC Editor Note: Please replace XXXX with the RFC numbers assigned to
   draft-ietf-ccamp-layer0-types.  Please replace YYYY with the RFC
   number assigned to this document.  Please remove this note.






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5.  Main Components of the Flexi-grid Topology

   This section describes the YANG module.  It is specified in
   Section 8.

   The description of the three main components, flexi-grid-node, flexi-
   grid-transponder and flexi-grid-link is provided below.  flexi-grid-
   sliceable-transponders are also defined.

   The syntax specification below uses the augmented Backus-Naur Form
   (BNF) as described in [RFC5234].


      <flexi-grid-node> ::= <config> <state>

         <flexi-grid-node>: This element designates a node in the
             network.

      <config> ::= <flexi-grid-node-attributes-config>

         <config>: Contains the configuration of a node.

      <flexi-grid-node-attributes-config> ::= <list-interface>
                                              <connectivity_matrix>

         <flexi-grid-node-attributes-config>: Contains all the
             attributes related to the node configuration, such as its
             interfaces or its management addresses.

      <list-interface> ::= <name> <port-number>
            <input-port> <output-port> <description>
            <interface-type>
            [<numbered-interface> / <unnumbered-interface>]

         <list-interface>: The list containing all the information of
             the interfaces.

         <name>: Determines the interface name.

         <port-number>: Port number of the interface.

         <input-port>: Boolean value that defines whether the interface
             is input or not.

         <output-port>: Boolean value that defines whether the interface
             is output or not.

         <description>: Description of the usage of the interface.



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         <interface-type>: Determines if the interface is numbered or
             unnumbered.

      <numbered-interface> ::= <n-i-ip-address>

         <numbered-interface>: An interface with its own IP address.

         <n-i-ip-address>: Only available if <interface-type> is
             "numbered-interface".  Determines the IP address of the
             interface.

      <unnumbered-interface> ::= <u-i-ip-address> <label>

         <unnumbered-interface>: An interface that needs a label to be
           unique.

         <u-i-ip-address>: Only available if <interface-type> is
             "numbered-interface".  Determines the node IP address,
             which with the label defines the interface.

         <label>: Label that determines the interface, joint with the
             node IP address.

      <connectivity-matrix> ::= <connections>

         <connectivity-matrix>: Determines whether a connection port
             in/port out exists.

      <connections> ::= <input-port-id> <output-port-id>

      <flexi-grid-transponder> ::= <transponder-type> <config> <state>

         <flexi-grid-transponder>: This item designates a transponder
             of a node.

      <config> ::= <flexi-grid-transponder-attributes-config>

         <config>: Contains the configuration of a transponder.

      <flexi-grid-transponder-attributes-config> ::=
                  <available-operational-mode> <operational-mode>

         <flexi-grid-transponder-attributes>: Contains all the
             attributes related to the transponder.

         <available-operational-mode>: It provides a list of the
             operational modes available at this transponder.




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         <operational-mode>: Determines the type of operational
             mode in use.

      <state> ::= <flexi-grid-transponder-attributes-config>
                  <flexi-grid-transponder-attributes-state>

         <state>: Contains the state of a transponder.

         <flexi-grid-transponder-attributes-config>: See above.

         <flexi-grid-transponder-attributes-state>: Contains the
             state of a transponder.

      <flexi-grid-link> ::= <config> <state>

         <flexi-grid-link>: This element describes all the
             information of a link.

      <config> ::= <flexi-grid-link-attributes-config>

         <config>: Contains the configuration of a link.

      <flexi-grid-link-attributes-config> ::= <technology-type>
                <available-label-flexi-grid> <N-max> <base-frequency>
                <nominal-central-frequency-granularity>
                <slot-width-granularity>

         <flexi-grid-link-attributes>: Contains all the attributes
             related to the link, such as its unique id, its N value,
             its latency, etc.

         <link-id>: Unique id of the link.

         <available-label-flexi-grid>: Array of bits that determines,
             with each bit, the availability of each interface for
             flexi-grid technology.

         <N-max>: The max value of N in this link, being N the number
             of slots.

         <base-frequency>: The default central frequency used in the
             link.

         <nominal-central-frequency-granularity>: It is the spacing
             between allowed nominal central frequencies and it is set
             to 6.25 GHz (note: sometimes referred to as 0.00625 THz).

         <slot-width-granularity>: 12.5 GHz, as defined in G.694.1.



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      <state> ::= <flexi-grid-link-attributes-config>
                  <flexi-grid-link-attributes-state>

         <state>: Contains the state of a link.

         <flexi-grid-link-attributes-config>: See above.

         <flexi-grid-link-attributes-state>: Contains all the
             information related to the state of a link.

      <flexi-grid-transponder> ::= <transponder-type> <config> <state>

         <flexi-grid-transponder>: This item designates a transponder
             of a node.

      <config> ::= <flexi-grid-transponder-attributes-config>

         <config>: Contains the configuration of a transponder.

      <flexi-grid-transponder-attributes-config> ::=
                <available-operational-mode> <operational-mode>

         <flexi-grid-transponder-attributes>: Contains all the
             attributes related to the transponder.

         <available-operational-mode>: It provides a list of the
             operational modes available at this transponder.

         <operational-mode>: Determines the type of operational
             mode in use.

      <state> ::= <flexi-grid-transponder-attributes-config>
                  <flexi-grid-transponder-attributes-state>

         <state>: Contains the state of a transponder.

         <flexi-grid-transponder-attributes-config>: See above.

         <flexi-grid-transponder-attributes-state>: Contains the
             state of a transponder.

      <flexi-grid-link> ::= <config> <state>

         <flexi-grid-link>: This element describes all the information
             of a link.

      <config> ::= <flexi-grid-link-attributes-config>




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         <config>: Contains the configuration of a link.

      <flexi-grid-link-attributes-config> ::= <technology-type>
                <available-label-flexi-grid> <N-max> <base-frequency>
                <nominal-central-frequency-granularity>
                <slot-width-granularity>

         <flexi-grid-link-attributes>: Contains all the attributes
             related to the link, such as its unique id, its N value,
             its latency, etc.

         <link-id>: Unique id of the link.

         <available-label-flexi-grid>: Array of bits that determines,
             with each bit, the availability of each interface for
             flexi-grid technology.

         <N-max>: The max value of N in this link, being N the number
             of slots.

         <base-frequency>: The default central frequency used in the
             link.

         <nominal-central-frequency-granularity>: It is the spacing
             between allowed nominal central frequencies and it is set
             to 6.25 GHz (note: sometimes referred to as 0.00625 THz).

         <slot-width-granularity>: 12.5 GHz, as defined in G.694.1.

      <state> ::= <flexi-grid-link-attributes-config>
                  <flexi-grid-link-attributes-state>

         <state>: Contains the state of a link.

         <flexi-grid-link-attributes-config>: See above.

         <flexi-grid-link-attributes-state>: Contains all the
             information related to the state of a link.

      <flexi-grid-transponder> ::= <transponder-type> <config> <state>

         <flexi-grid-transponder>: This item designates a transponder
             of a node.

      <config> ::= <flexi-grid-transponder-attributes-config>

         <config>: Contains the configuration of a transponder.




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      <flexi-grid-transponder-attributes-config> ::=
                <available-operational-mode> <operational-mode>

         <flexi-grid-transponder-attributes>: Contains all the
             attributes related to the transponder.

         <available-operational-mode>: It provides a list of the
             operational modes available at this transponder.

         <operational-mode>: Determines the type of operational mode
             in use.

      <state> ::= <flexi-grid-transponder-attributes-config>
                  <flexi-grid-transponder-attributes-state>

         <state>: Contains the state of a transponder.

         <flexi-grid-transponder-attributes-config>: See above.

         <flexi-grid-transponder-attributes-state>: Contains the
             state of a transponder.

      <flexi-grid-link> ::= <config> <state>

         <flexi-grid-link>: This element describes all the information
             of a link.

      <config> ::= <flexi-grid-link-attributes-config>

         <config>: Contains the configuration of a link.

      <flexi-grid-link-attributes-config> ::= <technology-type>
                <available-label-flexi-grid> <N-max> <base-frequency>
                <nominal-central-frequency-granularity>
                <slot-width-granularity>

         <flexi-grid-link-attributes>: Contains all the attributes
             related to the link, such as its unique id, its N value,
             its latency, etc.

         <link-id>: Unique id of the link.

         <available-label-flexi-grid>: Array of bits that determines,
             with each bit, the availability of each interface for
             flexi-grid technology.

         <N-max>: The max value of N in this link, being N the number
             of slots.



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         <base-frequency>: The default central frequency used in the
             link.

         <nominal-central-frequency-granularity>: It is the spacing
             between allowed nominal central frequencies and it is set
             to 6.25 GHz (note: sometimes referred to as 0.00625 THz).

         <slot-width-granularity>: 12.5 GHz, as defined in G.694.1.

      <state> ::= <flexi-grid-link-attributes-config>
                  <flexi-grid-link-attributes-state>

         <state>: Contains the state of a link.

         <flexi-grid-link-attributes-config>: See above.

         <flexi-grid-link-attributes-state>: Contains all the
             information related to the state of a link.


6.  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.
























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                                  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 3: Topology Example

   In order to configure a media channel to interconnect transponders A
   and E, first of all we have to populate the flexi-grid topology YANG
   model with all elements in the network:

   o  We define the transponders A and E, including their FEC type, if
      enabled, and modulation type.  We also provide node identifiers
      and addresses for the transponders, as well as interfaces included
      in the transponders.  Sliceable transponders can also be defined
      if needed.

   o  We do the same for the nodes B, C and D, providing their
      identifiers, addresses and interfaces, as well as the internal
      connectivity matrix between interfaces.

   o  Then, we also define the links 1 to 5 that interconnect nodes and
      transponders, indicating which flexi-grid labels are available.

   o  Other information, such as the slot frequency and granularity are
      also provided.





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   o  Next, 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.  We refer to
      [I-D.ietf-ccamp-flexigrid-media-channel-yang] to complete this
      example.

7.  YANG Model (Tree Structure) for Flexi-grid topology


   module: ietf-flexi-grid-topology
     augment /nw:networks/nw:network/nw:network-types/tet:te-topology:
       +--rw flexi-grid-topology!
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes:
       +--rw flexi-grid-node!
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te



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               /tet:information-source-entry/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction:
       +--ro grid-type?    identityref
       +--ro priority?     uint8
       +--ro flexi-grid
          +--ro slot-width-granularity?   identityref
          +--ro min-slot-width-factor?    uint16
          +--ro max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction:
       +--ro grid-type?    identityref
       +--ro priority?     uint8
       +--ro flexi-grid
          +--ro slot-width-granularity?   identityref
          +--ro min-slot-width-factor?    uint16
          +--ro max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction:
       +--ro grid-type?    identityref
       +--ro priority?     uint8
       +--ro flexi-grid
          +--ro slot-width-granularity?   identityref
          +--ro min-slot-width-factor?    uint16
          +--ro max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:label-restrictions
               /tet:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:label-restrictions
               /tet:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16



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          +--rw max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:label-restrictions
               /tet:label-restriction:
       +--ro grid-type?    identityref
       +--ro priority?     uint8
       +--ro flexi-grid
          +--ro slot-width-granularity?   identityref
          +--ro min-slot-width-factor?    uint16
          +--ro max-slot-width-factor?    uint16
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction:
       +--rw grid-type?    identityref
       +--rw priority?     uint8
       +--rw flexi-grid
          +--rw slot-width-granularity?   identityref
          +--rw min-slot-width-factor?    uint16
          +--rw max-slot-width-factor?    uint16
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-start/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-end/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te



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               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:underlay/tet:primary-path/tet:path-element/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:underlay/tet:backup-path/tet:path-element/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:optimizations/tet:algorithm/tet:metric
               /tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:optimizations/tet:algorithm/tet:metric
               /tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:



Lopez de Vergara, et al. Expires March 26, 2021                [Page 16]

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       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:path-properties/tet:path-route-objects
               /tet:path-route-object/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label



Lopez de Vergara, et al. Expires March 26, 2021                [Page 17]

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               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:underlay/tet:primary-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:underlay/tet:backup-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:optimizations/tet:algorithm



Lopez de Vergara, et al. Expires March 26, 2021                [Page 18]

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               /tet:metric/tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:optimizations/tet:algorithm
               /tet:metric/tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:te-node-attributes/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:path-properties
               /tet:path-route-objects/tet:path-route-object/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-start/tet:te-label/tet:technology:
       +--:(flexi-grid)



Lopez de Vergara, et al. Expires March 26, 2021                [Page 19]

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          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-end/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:label-restrictions/tet:label-restriction
               /tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--ro flexi-grid-channel-spacing?   identityref
          +--ro flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:underlay/tet:primary-path/tet:path-element/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:underlay/tet:backup-path/tet:path-element/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:optimizations/tet:algorithm/tet:metric
               /tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)



Lopez de Vergara, et al. Expires March 26, 2021                [Page 20]

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          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:optimizations/tet:algorithm/tet:metric
               /tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:path-properties/tet:path-route-objects
               /tet:path-route-object/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions



Lopez de Vergara, et al. Expires March 26, 2021                [Page 21]

Internet-Draft               Flexi-Grid YANG              September 2020


               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:from/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--ro flexi-grid-channel-spacing?   identityref
          +--ro flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:to/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--ro flexi-grid-channel-spacing?   identityref
          +--ro flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:underlay/tet:primary-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices



Lopez de Vergara, et al. Expires March 26, 2021                [Page 22]

Internet-Draft               Flexi-Grid YANG              September 2020


               /tet:connectivity-matrix/tet:underlay/tet:backup-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:optimizations/tet:algorithm
               /tet:metric/tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:optimizations/tet:algorithm
               /tet:metric/tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:information-source-entry/tet:connectivity-matrices
               /tet:connectivity-matrix/tet:path-properties
               /tet:path-route-objects/tet:path-route-object/tet:type



Lopez de Vergara, et al. Expires March 26, 2021                [Page 23]

Internet-Draft               Flexi-Grid YANG              September 2020


               /tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:underlay
               /tet:primary-path/tet:path-element/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:underlay



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               /tet:backup-path/tet:path-element/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:optimizations
               /tet:algorithm/tet:metric/tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:optimizations
               /tet:algorithm/tet:metric/tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities/tet:path-properties
               /tet:path-route-objects/tet:path-route-object/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet:technology:



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       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:underlay
               /tet:primary-path/tet:path-element/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m



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     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:underlay/tet:backup-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:optimizations
               /tet:algorithm/tet:metric/tet:optimization-metric
               /tet:explicit-route-exclude-objects
               /tet:route-object-exclude-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:optimizations
               /tet:algorithm/tet:metric/tet:optimization-metric
               /tet:explicit-route-include-objects
               /tet:route-object-include-object/tet:type/tet:label
               /tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n



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                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nw:node/tet:te
               /tet:tunnel-termination-point
               /tet:local-link-connectivities
               /tet:local-link-connectivity/tet:path-properties
               /tet:path-route-objects/tet:path-route-object/tet:type
               /tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--ro (single-or-super-channel)?
             +--:(single)
             |  +--ro flexi-n?              l0-types:flexi-n
             |  +--ro flexi-m?              l0-types:flexi-m
             +--:(super)
                +--ro subcarrier-flexi-n* [flexi-n]
                   +--ro flexi-n    l0-types:flexi-n
                   +--ro flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:underlay/tet:primary-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:underlay/tet:backup-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n



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     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--ro flexi-n?   l0-types:flexi-n
     augment /nw:networks/nw:network/nt:link/tet:te
               /tet:information-source-entry/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--ro flexi-grid-channel-spacing?   identityref
          +--ro flexi-n-step?                 uint8
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:underlay/tet:primary-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)
          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:underlay/tet:backup-path
               /tet:path-element/tet:type/tet:label/tet:label-hop
               /tet:te-label/tet:technology:
       +--:(flexi-grid)



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          +--rw (single-or-super-channel)?
             +--:(single)
             |  +--rw flexi-n?              l0-types:flexi-n
             |  +--rw flexi-m?              l0-types:flexi-m
             +--:(super)
                +--rw subcarrier-flexi-n* [flexi-n]
                   +--rw flexi-n    l0-types:flexi-n
                   +--rw flexi-m?   l0-types:flexi-m
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-start/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-end/tet:te-label
               /tet:technology:
       +--:(flexi-grid)
          +--rw flexi-n?   l0-types:flexi-n
     augment /nw:networks/tet:te/tet:templates/tet:link-template
               /tet:te-link-attributes/tet:label-restrictions
               /tet:label-restriction/tet:label-step/tet:technology:
       +--:(flexi-grid)
          +--rw flexi-grid-channel-spacing?   identityref
          +--rw flexi-n-step?                 uint8



8.  The YANG Code for Flexi-grid topology


   <CODE BEGINS> file "ietf-flexi-grid-topology@2020-09-21.yang"
    module ietf-flexi-grid-topology {
      yang-version 1.1;
      namespace "urn:ietf:params:xml:ns:yang:ietf-flexi-grid-topology";
      prefix "flexi-grid";

      import ietf-network {
        prefix "nw";
        reference
          "RFC 8345: A YANG Data Model for Network Topologies";
      }

      import ietf-network-topology {
        prefix "nt";
        reference
          "RFC 8345: A YANG Data Model for Network Topologies";



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      }

      import ietf-te-topology {
        prefix "tet";
        reference
          "RFC 8795: YANG Data Model for Traffic Engineering
           (TE) Topologies";
      }

      import ietf-layer0-types {
        prefix "l0-types";
        reference
          "RFC XXXX: A YANG Data Model for Layer 0 Types";
      }

    /* Note: The RFC Editor will replace XXXX with the number assigned
       to the RFC once draft-ietf-ccamp-layer0-types becomes an RFC.*/

      organization
         "IETF CCAMP Working Group";
      contact
        "WG Web: <http://tools.ietf.org/wg/ccamp/>
         WG List: <mailto:ccamp@ietf.org>
         Editor: Jorge E. Lopez de Vergara
                 <mailtojorge.lopez_vergara@uam.es>
         Editor: Daniel Perdices
                 <mailto:daniel.perdices@naudit.es>
         Editor: Haomian Zheng
                 <mailto:zhenghaomian@huawei.com>
         Editor: Daniel King
                 <mailto:d.king@lancaster.ac.uk>
         Editor: Young Lee
                 <mailto:younglee.tx@gmail.com>";

      description
        "This module defines a model for flexi-grid topology.
         Copyright (c) 2020 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
         (http://trustee.ietf.org/license-info).

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




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      revision 2020-09-21 {
        description
          "Initial Version";
        reference
          "RFC XXXX: A Yang Data Model for flexi-grid Optical Networks";
        // RFC Ed.: replace XXXX with actual RFC number, update date
        // information and remove this note
      }

      /*
       * Data nodes
       */

      augment "/nw:networks/nw:network/nw:network-types"
            + "/tet:te-topology" {
        description
          "Augment network types to define Flexi-grid topology type.";
           container flexi-grid-topology {
             presence
               "Its presence identifies the Flexi-grid topology type.";
             description
               "Introduce new network type for Flexi-grid topology.";
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te"
            + "/tet:te-node-attributes" {
        when "/nw:networks/nw:network/nw:network-types"
           + "/tet:te-topology/flexi-grid:flexi-grid-topology" {
          description
          "Augmentation parameters apply only for networks with
           Flexi-grid topology type.";
        }
        description "Augment TE node attributes.";
        container flexi-grid-node {
          presence "The TE node is a Flexi-grid node.";
          description "Flexi-grid node attributes";
        }
      }

      /*
       * Augment TE label range information
       */

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:label-restrictions/tet:label-restriction" {
        when "../../../../../../nw:network-types/tet:te-topology/"



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           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range information for the TE node
           connectivity matrices.";
        uses l0-types:flexi-grid-label-range-info;
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/tet:from/"
            + "tet:label-restrictions/tet:label-restriction" {
        when "../../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range information for the source LTP
           of the connectivity matrix entry.";
        uses l0-types:flexi-grid-label-range-info;
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/tet:to/"
            + "tet:label-restrictions/tet:label-restriction" {
        when "../../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range information for the destination LTP
           of the connectivity matrix entry.";
        uses l0-types:flexi-grid-label-range-info;
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/"
            + "tet:connectivity-matrices/tet:label-restrictions/"
            + "tet:label-restriction" {
        when "../../../../../../nw:network-types/tet:te-topology/"



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           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range information for the TE node
           connectivity matrices information source.";
        uses l0-types:flexi-grid-label-range-info;
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:from/tet:label-restrictions/tet:label-restriction" {
        when "../../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range information for the source LTP
           of the connectivity matrix entry information source.";
        uses l0-types:flexi-grid-label-range-info;
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:to/tet:label-restrictions/tet:label-restriction" {
        when "../../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range information for the destination LTP
           of the connectivity matrix entry information source.";
        uses l0-types:flexi-grid-label-range-info;
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:label-restrictions/tet:label-restriction" {
        when "../../../../../../nw:network-types/tet:te-topology/"



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           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range information for the TTP
           Local Link Connectivities.";
        uses l0-types:flexi-grid-label-range-info;
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:local-link-connectivity/"
            + "tet:label-restrictions/tet:label-restriction" {
        when "../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range information for the TTP
           Local Link Connectivity entry.";
        uses l0-types:flexi-grid-label-range-info;
      }

      augment "/nw:networks/nw:network/nt:link/tet:te/"
            + "tet:te-link-attributes/"
            + "tet:label-restrictions/tet:label-restriction" {
        when "../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range information for the TE link.";
        uses l0-types:flexi-grid-label-range-info;
      }

      augment "/nw:networks/nw:network/nt:link/tet:te/"
            + "tet:information-source-entry/"
            + "tet:label-restrictions/tet:label-restriction" {
        when "../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description



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            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range information for the TE link
           information source.";
        uses l0-types:flexi-grid-label-range-info;
      }

      augment "/nw:networks/tet:te/tet:templates/"
            + "tet:link-template/tet:te-link-attributes/"
            + "tet:label-restrictions/tet:label-restriction" {
        description
          "Augment TE label range information for the TE link
           template.";
        uses l0-types:flexi-grid-label-range-info;
      }

      /*
       * Augment TE label
       */

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-start/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range start for the TE node
           connectivity matrices";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:label-restrictions/"
            + "tet:label-restriction/tet:label-end/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {



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          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range end for the TE node
           connectivity matrices";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:label-restrictions/"
            + "tet:label-restriction/tet:label-step/"
            + "tet:technology" {
        when "../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range step for the TE node
           connectivity matrices";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:underlay/tet:primary-path/tet:path-element/"
            + "tet:type/tet:label/tet:label-hop/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay primary path of the
           TE node connectivity matrices";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;



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        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:underlay/tet:backup-path/tet:path-element/"
            + "tet:type/tet:label/tet:label-hop/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay backup path of the
           TE node connectivity matrices";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:optimizations/tet:algorithm/tet:metric/"
            + "tet:optimization-metric/"
            + "tet:explicit-route-exclude-objects/"
            + "tet:route-object-exclude-object/"
            + "tet:type/tet:label/tet:label-hop/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects excluded
           by the path computation of the TE node connectivity
           matrices";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"



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            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:optimizations/tet:algorithm/tet:metric/"
            + "tet:optimization-metric/"
            + "tet:explicit-route-include-objects/"
            + "tet:route-object-include-object/"
            + "tet:type/tet:label/tet:label-hop/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects included
           by the path computation of the TE node connectivity
           matrices";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:path-properties/tet:path-route-objects/"
            + "tet:path-route-object/tet:type/tet:label/tet:label-hop/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the computed path route objects
           of the TE node connectivity matrices";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/tet:from/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-start/"



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            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range start for the source LTP
           of the connectivity matrix entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/tet:from/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-end/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range end for the source LTP
           of the connectivity matrix entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/tet:from/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-step/"
            + "tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with



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             Flexi-grid topology type.";
        }
        description
          "Augment TE label range step for the source LTP
           of the connectivity matrix entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/tet:to/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-start/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range start for the destination LTP
           of the connectivity matrix entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/tet:to/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-end/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range end for the destination LTP
           of the connectivity matrix entry.";
        case flexi-grid {



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          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/tet:to/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-step/"
            + "tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range step for the destination LTP
           of the connectivity matrix entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:underlay/tet:primary-path/tet:path-element/"
            + "tet:type/tet:label/tet:label-hop/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay primary path
           of the connectivity matrix entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"



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            + "tet:connectivity-matrix/"
            + "tet:underlay/tet:backup-path/tet:path-element/"
            + "tet:type/tet:label/tet:label-hop/"
            + "tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay backup path
           of the connectivity matrix entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/tet:optimizations/"
            + "tet:algorithm/tet:metric/tet:optimization-metric/"
            + "tet:explicit-route-exclude-objects/"
            + "tet:route-object-exclude-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects excluded
           by the path computation of the connectivity matrix entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/tet:optimizations/"
            + "tet:algorithm/tet:metric/tet:optimization-metric/"
            + "tet:explicit-route-include-objects/"
            + "tet:route-object-include-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {



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        when "../../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects included
           by the path computation of the connectivity matrix entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:te-node-attributes/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:path-properties/tet:path-route-objects/"
            + "tet:path-route-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the computed path route objects
           of the connectivity matrix entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/"
            + "tet:connectivity-matrices/tet:label-restrictions/"
            + "tet:label-restriction/"
            + "tet:label-start/tet:te-label/tet:technology" {
        when "../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }



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        description
          "Augment TE label range start for the TE node connectivity
           matrices information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/"
            + "tet:connectivity-matrices/tet:label-restrictions/"
            + "tet:label-restriction/"
            + "tet:label-end/tet:te-label/tet:technology" {
        when "../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range end for the TE node connectivity
           matrices information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/"
            + "tet:connectivity-matrices/tet:label-restrictions/"
            + "tet:label-restriction/"
            + "tet:label-step/tet:technology" {
        when "../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range step for the TE node connectivity
           matrices information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;
        }
      }




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      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay primary path
           of the TE node connectivity matrices of the information
           source entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay backup path
           of the TE node connectivity matrices of the information
           source entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:optimizations/tet:algorithm/tet:metric/"
            + "tet:optimization-metric/"
            + "tet:explicit-route-exclude-objects/"
            + "tet:route-object-exclude-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"



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           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects excluded
           by the path computation of the TE node connectivity matrices
           information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:optimizations/tet:algorithm/tet:metric/"
            + "tet:optimization-metric/"
            + "tet:explicit-route-include-objects/"
            + "tet:route-object-include-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects included
           by the path computation of the TE node connectivity matrices
           information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:path-properties/tet:path-route-objects/"
            + "tet:path-route-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with



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             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the computed path route objects
           of the TE node connectivity matrices information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:from/tet:label-restrictions/"
            + "tet:label-restriction/"
            + "tet:label-start/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range start for the source LTP
           of the connectivity matrix entry information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }
      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:from/tet:label-restrictions/"
            + "tet:label-restriction/"
            + "tet:label-end/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range end for the source LTP
           of the connectivity matrix entry information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;



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        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:from/tet:label-restrictions/"
            + "tet:label-restriction/"
            + "tet:label-step/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range step for the source LTP
           of the connectivity matrix entry information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:to/tet:label-restrictions/tet:label-restriction/"
            + "tet:label-start/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range start for the destination LTP
           of the connectivity matrix entry information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:to/tet:label-restrictions/tet:label-restriction/"



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            + "tet:label-end/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range end for the destination LTP
           of the connectivity matrix entry information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:to/tet:label-restrictions/tet:label-restriction/"
            + "tet:label-step/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range step for the destination LTP
           of the connectivity matrix entry information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }



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        description
          "Augment TE label hop for the underlay primary path
           of the connectivity matrix entry information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay backup path
           of the connectivity matrix entry information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:optimizations/tet:algorithm/tet:metric/"
            + "tet:optimization-metric/"
            + "tet:explicit-route-exclude-objects/"
            + "tet:route-object-exclude-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects excluded
           by the path computation of the connectivity matrix entry
           information source.";
        case flexi-grid {



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          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:optimizations/tet:algorithm/tet:metric/"
            + "tet:optimization-metric/"
            + "tet:explicit-route-include-objects/"
            + "tet:route-object-include-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects included
           by the path computation of the connectivity matrix entry
           information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:information-source-entry/tet:connectivity-matrices/"
            + "tet:connectivity-matrix/"
            + "tet:path-properties/tet:path-route-objects/"
            + "tet:path-route-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the computed path route objects
           of the connectivity matrix entry information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }



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      augment "/nw:networks/nw:network/nw:node/tet:te/"
          + "tet:tunnel-termination-point/"
          + "tet:local-link-connectivities/"
          + "tet:label-restrictions/tet:label-restriction/"
          + "tet:label-start/"
          + "tet:te-label/tet:technology" {
        when "../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range start for the TTP
           Local Link Connectivities.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-end/"
            + "tet:te-label/tet:technology"{
        when "../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range end for the TTP
           Local Link Connectivities.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-step/"
            + "tet:technology"{



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        when "../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range step for the TTP
           Local Link Connectivities.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay primary path
           of the TTP Local Link Connectivities.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description



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          "Augment TE label hop for the underlay backup path
           of the TTP Local Link Connectivities.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:optimizations/tet:algorithm/tet:metric/"
            + "tet:optimization-metric/"
            + "tet:explicit-route-exclude-objects/"
            + "tet:route-object-exclude-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects excluded
           by the path computation of the TTP Local Link
           Connectivities.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:optimizations/tet:algorithm/tet:metric/"
            + "tet:optimization-metric/"
            + "tet:explicit-route-include-objects/"
            + "tet:route-object-include-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects included



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           by the path computation of the TTP Local Link
           Connectivities.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:path-properties/tet:path-route-objects/"
            + "tet:path-route-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the computed path route objects
           of the TTP Local Link Connectivities.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:local-link-connectivity/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-start/tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range start for the TTP
           Local Link Connectivity entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }



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      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:local-link-connectivity/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-end/tet:te-label/tet:technology" {
        when "../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range end for the TTP
           Local Link Connectivity entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:local-link-connectivity/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-step/tet:technology" {
        when "../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range step for the TTP
           Local Link Connectivity entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:local-link-connectivity/"
            + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {



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        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay primary path
           of the TTP Local Link Connectivity entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:local-link-connectivity/"
            + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay backup path
           of the TTP Local Link Connectivity entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:local-link-connectivity/"
            + "tet:optimizations/tet:algorithm/tet:metric/"
            + "tet:optimization-metric/"
            + "tet:explicit-route-exclude-objects/"
            + "tet:route-object-exclude-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {



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          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects excluded
           by the path computation of the TTP Local Link
           Connectivity entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:local-link-connectivity/"
            + "tet:optimizations/tet:algorithm/tet:metric/"
            + "tet:optimization-metric/"
            + "tet:explicit-route-include-objects/"
            + "tet:route-object-include-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the explicit route objects included
           by the path computation of the TTP Local Link
           Connectivity entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nw:node/tet:te/"
            + "tet:tunnel-termination-point/"
            + "tet:local-link-connectivities/"
            + "tet:local-link-connectivity/"
            + "tet:path-properties/tet:path-route-objects/"
            + "tet:path-route-object/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {



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          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the computed path route objects
           of the TTP Local Link Connectivity entry.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }
      augment "/nw:networks/nw:network/nt:link/tet:te/"
            + "tet:te-link-attributes/"
            + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay primary path
           of the TE link.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/nw:network/nt:link/tet:te/"
            + "tet:te-link-attributes/"
            + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        when "../../../../../../../../"
           + "nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label hop for the underlay backup path
           of the TE link.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }



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      augment "/nw:networks/nw:network/nt:link/tet:te/"
            + "tet:te-link-attributes/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-start/tet:te-label/tet:technology" {
        when "../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range start for the TE link.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nt:link/tet:te/"
            + "tet:te-link-attributes/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-end/tet:te-label/tet:technology" {
        when "../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range end for the TE link.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nt:link/tet:te/"
            + "tet:te-link-attributes/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-step/tet:technology" {
        when "../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range step for the TE link.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;



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        }
      }

      augment "/nw:networks/nw:network/nt:link/tet:te/"
            + "tet:information-source-entry/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-start/tet:te-label/tet:technology" {
        when "../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range start for the TE link
           information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nt:link/tet:te/"
            + "tet:information-source-entry/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-end/tet:te-label/tet:technology" {
        when "../../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";
        }
        description
          "Augment TE label range end for the TE link
           information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/nw:network/nt:link/tet:te/"
            + "tet:information-source-entry/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-step/tet:technology" {
        when "../../../../../../nw:network-types/tet:te-topology/"
           + "flexi-grid:flexi-grid-topology" {
          description
            "Augmentation parameters apply only for networks with
             Flexi-grid topology type.";



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        }
        description
          "Augment TE label range step for the TE link
           information source.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;
        }
      }

      augment "/nw:networks/tet:te/tet:templates/"
            + "tet:link-template/tet:te-link-attributes/"
            + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        description
          "Augment TE label hop for the underlay primary path
           of the TE link template.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/tet:te/tet:templates/"
            + "tet:link-template/tet:te-link-attributes/"
            + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
            + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
        description
          "Augment TE label hop for the underlay backup path
           of the TE link template.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-hop;
        }
      }

      augment "/nw:networks/tet:te/tet:templates/"
            + "tet:link-template/tet:te-link-attributes/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-start/tet:te-label/tet:technology" {
        description
          "Augment TE label range start for the TE link template.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/tet:te/tet:templates/"
            + "tet:link-template/tet:te-link-attributes/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-end/tet:te-label/tet:technology" {



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        description
          "Augment TE label range end for the TE link template.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-start-end;
        }
      }

      augment "/nw:networks/tet:te/tet:templates/"
            + "tet:link-template/tet:te-link-attributes/"
            + "tet:label-restrictions/tet:label-restriction/"
            + "tet:label-step/tet:technology" {
        description
          "Augment TE label range step for the TE link template.";
        case flexi-grid {
          uses l0-types:flexi-grid-label-step;
        }
      }
    }
    <CODE ENDS>


9.  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 users to a preconfigured
   subset of all available NETCONF protocol operations and content.  The
   NETCONF Protocol over Secure Shell (SSH) [RFC6242] describes a method
   for invoking and running NETCONF within a Secure Shell (SSH) session
   as an SSH subsystem.  The Network Configuration Access Control Model
   (NACM) [RFC8341] provides the means to restrict access for particular
   NETCONF or RESTCONF users to a preconfigured subset of all available
   NETCONF or RESTCONF protocol operations and content.

   A number of configuration data nodes defined in this document are
   writable/deletable (i.e., "config true").  These data nodes may be
   considered sensitive or vulnerable in some network environments.

   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



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   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.  These are the subtrees and data nodes
   and their sensitivity/vulnerability:


      /nw:networks/nw:network/nw:network-types/tet:te-topology

      /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes

      /nw:networks/nw:network/nw:node/nt:termination-point/tet:te

      /nw:networks/nw:network/nw:node/tet:te/tet:te-node-attributes
      /te-connectivity-matrices/te-connectivity-matrix/tet:path-
      constraints/tet:te-bandwidth/tet:technology

      /nw:networks/nw:network/nw:node/tet:te
      /tet:tunnel-termination-point/tet:local-link-connectivities
      /tet:label-restrictions/tet:label-restriction


10.  IANA Considerations

   IANA is requested to assigned a new URI from the "IETF XML Registry"
   [RFC3688] as follows:


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



   IANA is requested to assign a new YANG module name in the "YANG
   Module Names" registry [RFC6020] as follows:


         Name: ietf-flexi-grid-topology
         Namespace: urn:ietf:params:xml:ns:yang:ietf-flexi-grid-topology
         Prefix: flexi-grid-topology
         Reference: [This.I-D]


11.  Contributors

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



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   Oscar Gonzalez de Dios
   Telefonica I+D/GCTO
   Email: oscar.gonzalezdedios@telefonica.com

   Gabriele Galimberti
   Cisco
   Email: ggalimbe@cisco.com

   Zafar Ali
   Cisco
   Email: zali@cisco.com

   Daniel Michaud Vallinoto
   Universidad Autonoma de Madrid
   Email: TBD

   Steven Hill,
   MTN Group Technology
   Email: Steven.Hill@mtn.com

   Victor Lopez
   Telefonica I+D/GCTO
   Email: victor.lopezalvarez@telefonica.com

   Italo Busi
   Huawei
   Email: Italo.Busi@huawei.com

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

12.  Acknowledgments

   The work presented in this document 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.

   Thanks to Adrian Farrel for reviewing this document and assisting
   with conversion to XML.








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13.  References

13.1.  Normative References

   [I-D.ietf-ccamp-layer0-types]
              Zheng, H., Lee, Y., Guo, A., Lopez, V., and D. King, "A
              YANG Data Model for Layer 0 Types", draft-ietf-ccamp-
              layer0-types-07 (work in progress), September 2020.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

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

   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", STD 68, RFC 5234,
              DOI 10.17487/RFC5234, January 2008,
              <https://www.rfc-editor.org/info/rfc5234>.

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

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

   [RFC7446]  Lee, Y., Ed., Bernstein, G., Ed., Li, D., and W. Imajuku,
              "Routing and Wavelength Assignment Information Model for
              Wavelength Switched Optical Networks", RFC 7446,
              DOI 10.17487/RFC7446, February 2015,
              <https://www.rfc-editor.org/info/rfc7446>.

   [RFC7581]  Bernstein, G., Ed., Lee, Y., Ed., Li, D., Imajuku, W., and
              J. Han, "Routing and Wavelength Assignment Information
              Encoding for Wavelength Switched Optical Networks",
              RFC 7581, DOI 10.17487/RFC7581, June 2015,
              <https://www.rfc-editor.org/info/rfc7581>.



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   [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>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [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>.

   [RFC8345]  Clemm, A., Medved, J., Varga, R., Bahadur, N.,
              Ananthakrishnan, H., and X. Liu, "A YANG Data Model for
              Network Topologies", RFC 8345, DOI 10.17487/RFC8345, March
              2018, <https://www.rfc-editor.org/info/rfc8345>.

   [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>.

   [RFC8795]  Liu, X., Bryskin, I., Beeram, V., Saad, T., Shah, H., and
              O. Gonzalez de Dios, "YANG Data Model for Traffic
              Engineering (TE) Topologies", RFC 8795,
              DOI 10.17487/RFC8795, August 2020,
              <https://www.rfc-editor.org/info/rfc8795>.

13.2.  Informative References

   [G.694.1]  International Telecommunication Union, "Spectral grids for
              WDM applications: DWDM frequency grid", ITUT G.872,
              February 2012.

   [G.872]    International Telecommunication Union, "Architecture of
              optical transport networks", ITUT G.872, November 2010.

   [I-D.ietf-ccamp-flexigrid-media-channel-yang]
              Madrid, U., Perdices, D., Lopezalvarez, V., Dios, O.,
              King, D., Lee, Y., and G. Galimberti, "YANG data model for
              Flexi-Grid media-channels", draft-ietf-ccamp-flexigrid-
              media-channel-yang-02 (work in progress), March 2019.





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   [RFC7698]  Gonzalez de Dios, O., Ed., Casellas, R., Ed., Zhang, F.,
              Fu, X., Ceccarelli, D., and I. Hussain, "Framework and
              Requirements for GMPLS-Based Control of Flexi-Grid Dense
              Wavelength Division Multiplexing (DWDM) Networks",
              RFC 7698, DOI 10.17487/RFC7698, November 2015,
              <https://www.rfc-editor.org/info/rfc7698>.

   [RFC7699]  Farrel, A., King, D., Li, Y., and F. Zhang, "Generalized
              Labels for the Flexi-Grid in Lambda Switch Capable (LSC)
              Label Switching Routers", RFC 7699, DOI 10.17487/RFC7699,
              November 2015, <https://www.rfc-editor.org/info/rfc7699>.

   [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

   Jorge E. Lopez de Vergara Mendez
   Universidad Autonoma de Madrid

   Email: jorge.lopez_vergara@uam.es


   Daniel Perdices Burrero
   Naudit

   Email: daniel.perdices@naudit.es


   Daniel King
   Old Dog Consulting

   Email: daniel@olddog.co.uk


   Young Lee
   Samsung

   Email: younglee.tx@gmail.co


   Haomian Zheng
   Huawei Technologies

   Email: zhenghaomian@huawei.com





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