path: root/doc/rfc/rfc9656.txt

Internet Engineering Task Force (IETF)                 S. Mansfield, Ed.
Request for Comments: 9656                                  Ericsson Inc
Category: Standards Track                                     J. Ahlberg
ISSN: 2070-1721                                              Ericsson AB
                                                                   M. Ye
                                                     Huawei Technologies
                                                                   X. Li
                                                 NEC Laboratories Europe
                                                            D. Spreafico
                                                              Nokia - IT
                                                          September 2024


                A YANG Data Model for Microwave Topology

Abstract

   This document defines a YANG data model to describe microwave and
   millimeter-wave radio links in a network topology.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc9656.

Copyright Notice

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

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Revised BSD License text as described in Section 4.e of the
   Trust Legal Provisions and are provided without warranty as described
   in the Revised BSD License.

Table of Contents

   1.  Introduction
     1.1.  Abbreviations
     1.2.  Tree Structure
     1.3.  Prefixes in Data Node Names
   2.  Microwave Topology YANG Data Model
     2.1.  YANG Tree
     2.2.  Relationship between Radio Links and Carriers
     2.3.  Relationship with Client Topology Model
     2.4.  Applicability of the Data Model for Traffic Engineering
           (TE) Topologies
     2.5.  Microwave Topology YANG Module
   3.  Security Considerations
   4.  IANA Considerations
   5.  References
     5.1.  Normative References
     5.2.  Informative References
   Appendix A.  Microwave Topology Model with Base Topology Models
     A.1.  Instance Data for 2+0 Mode for a Bonded Configuration
     A.2.  Instance Data for 1+1 Mode for a Protected Configuration
   Appendix B.  Microwave Topology Model with Example Extensions
     B.1.  Instance Data for 2+0 Mode
     B.2.  Instance Data for Geolocation Information
   Acknowledgments
   Contributors
   Authors' Addresses

1.  Introduction

   This document defines a YANG data model to describe microwave and
   millimeter-wave radio links in a network topology (hereafter,
   "microwave" is used to simplify the text).  The YANG data model
   describes radio links, supporting carrier(s), and the associated
   carrier termination points [RFC8561].  A carrier is a single link
   providing transport capacity over the air.  It is typically defined
   by its transmitting and receiving frequencies.  A radio link provides
   the transport capacity of the supporting carriers in aggregated and/
   or protected configurations, which can be used to carry traffic on
   higher topology layers such as Ethernet and Time-Division
   Multiplexing (TDM).  The model augments the YANG Data Model for
   Traffic Engineering (TE) Topologies defined in [RFC8795], which is
   based on A YANG Data Model for Network Topologies defined in
   [RFC8345].

   The microwave point-to-point radio technology provides connectivity
   on Layer 0 or Layer 1 (L0/L1) over a radio link between two
   termination points using one or several supporting carriers in
   aggregated or protected configurations.  That application of
   microwave technology cannot be used to perform cross-connection or
   switching of the traffic to create network connectivity across
   multiple microwave radio links.  Instead, a payload of traffic on
   higher topology layers, normally Layer 2 (L2) Ethernet, is carried
   over the microwave radio link.  When the microwave radio link is
   terminated at the endpoints, cross-connection and switching can be
   performed on that higher layer creating connectivity across multiple
   supporting microwave radio links.

   The microwave topology model is expected to be used between a
   Provisioning Network Controller (PNC) and a Multi-Domain Service
   Coordinator (MDSC) [RFC8453].  Examples of use cases that can be
   supported are:

   1.  Correlation between microwave radio links and the supported links
       on higher topology layers (e.g., an L2 Ethernet topology).  This
       information can be used to understand how changes in the
       performance/status of a microwave radio link affect traffic on
       higher layers.

   2.  Propagation of relevant characteristics of a microwave radio
       link, such as bandwidth, to higher topology layers, where it
       could be used as a criterion when configuring and optimizing a
       path for a connection or service through the network end to end.

   3.  Optimization of the microwave radio link configurations on a
       network level, with the purpose to minimize overall interference
       and/or maximize the overall capacity provided by the links.

1.1.  Abbreviations

   The following abbreviations are used in this document:

   CTP:  Carrier Termination Point

   RLT:  Radio Link Terminal

   RLTP:  Radio Link Termination Point

1.2.  Tree Structure

   A simplified graphical representation of the data model is used in
   Section 2 of this document.  The meaning of the symbols in these
   diagrams is defined in [RFC8340].

1.3.  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 Table 1.

             +==========+=======================+===========+
             | Prefix   | YANG Module           | Reference |
             +==========+=======================+===========+
             | nw       | ietf-network          | [RFC8345] |
             +----------+-----------------------+-----------+
             | nt       | ietf-network-topology | [RFC8345] |
             +----------+-----------------------+-----------+
             | mw-types | ietf-microwave-types  | [RFC8561] |
             +----------+-----------------------+-----------+
             | tet      | ietf-te-topology      | [RFC8795] |
             +----------+-----------------------+-----------+

               Table 1: Prefixes for Imported YANG Modules

2.  Microwave Topology YANG Data Model

2.1.  YANG Tree

     module: ietf-microwave-topology

       augment /nw:networks/nw:network/nw:network-types/tet:te-topology:
         +--rw mw-topology!
       augment /nw:networks/nw:network/nw:node/tet:te
                 /tet:te-node-attributes:
         +--rw mw-node!
       augment /nw:networks/nw:network/nw:node/nt:termination-point
                 /tet:te:
         +--rw mw-tp!
            +--rw (mw-tp-option)?
               +--:(microwave-rltp)
               |  +--rw microwave-rltp!
               +--:(microwave-ctp)
                  +--rw microwave-ctp!
       augment /nw:networks/nw:network/nt:link/tet:te
                 /tet:te-link-attributes:
         +--rw mw-link!
            +--rw (mw-link-option)
               +--:(microwave-radio-link)
               |  +--rw microwave-radio-link!
               |     +--rw rlt-mode
               |        +--rw num-bonded-carriers        uint32
               |        +--rw num-protecting-carriers    uint32
               +--:(microwave-carrier)
                  +--rw microwave-carrier!
                     +--rw tx-frequency?               uint32
                     +--ro actual-rx-frequency?        uint32
                     +--rw channel-separation?         uint32
                     +--ro actual-tx-cm?               identityref
                     +--ro actual-snir?                decimal64
                     +--ro actual-transmitted-level?   decimal64
       augment /nw:networks/nw:network/nt:link/tet:te
                 /tet:te-link-attributes/tet:max-link-bandwidth
                 /tet:te-bandwidth:
         +--ro mw-bandwidth?   uint64

                     Figure 1: Microwave Topology Tree

2.2.  Relationship between Radio Links and Carriers

   A microwave radio link is always an aggregate of one or multiple
   carriers in various configurations or modes.  The supporting carriers
   are identified by their termination points and are listed in the
   container-bundled links as part of the te-link-config in the YANG
   Data Model for Traffic Engineering (TE) Topologies [RFC8795] for a
   radio-link.  The exact configuration of the included carriers is
   further specified in the rlt-mode container (1+0, 2+0, 1+1, etc.) for
   the radio-link.  Appendix A includes JSON examples of how such a
   relationship can be modeled.

2.3.  Relationship with Client Topology Model

   A microwave radio link carries a payload of traffic on higher
   topology layers, normally L2 Ethernet.  The leafs supporting-network,
   supporting-node, supporting-link, and supporting-termination-point in
   the generic YANG module for Network Topologies [RFC8345] are expected
   to be used to model a relationship or dependency from higher topology
   layers to a supporting microwave radio link topology layer.
   Appendix A includes JSON examples of an L2 Ethernet link transported
   over one supporting microwave link.

2.4.  Applicability of the Data Model for Traffic Engineering (TE)
      Topologies

   Since microwave is a point-to-point radio technology, a majority of
   the leafs in the Data Model for Traffic Engineering (TE) Topologies
   [RFC8795] augmented by the microwave topology model are not
   applicable.  Examples of which leafs are considered applicable can be
   found in Appendices A and B in this document.

   In the more specific context of the microwave-specific augmentations
   of te-topology, the admin-status, and oper-status leafs (from te-
   topology) are only applicable to microwave carriers (in the mw-link
   tree); they are not applicable to microwave radio links.  Radio links
   are instead enabled or disabled in the constituent carriers.
   Furthermore, the status leafs related to mw-tp can be used with
   inter-domain links and when the status of only one side of the link
   is known.  However, since microwave is a point-to-point technology
   where both ends normally belong to the same domain, it is not
   expected to be applicable in normal cases.

2.5.  Microwave Topology YANG Module

   This module imports typedefs and modules from [RFC8345], [RFC8561],
   and [RFC8795].  It references [EN301129] and [EN302217-1].

   <CODE BEGINS> file "ietf-microwave-topology@2024-09-30.yang"
   module ietf-microwave-topology {
     yang-version 1.1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-microwave-topology";
     prefix mwt;

     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";
     }
     import ietf-te-topology {
       prefix tet;
       reference
         "RFC 8795: YANG Data Model for Traffic Engineering
          (TE) Topologies";
     }
     import ietf-microwave-types {
       prefix mw-types;
       reference
         "RFC 8561: A YANG Data Model for Microwave Radio Link";
     }

     organization
       "Internet Engineering Task Force (IETF) CCAMP WG";
     contact
       "WG Web: <https://datatracker.ietf.org/wg/ccamp/>
        WG List: <ccamp@ietf.org>

         Editor: Jonas Ahlberg
                 <jonas.ahlberg@ericsson.com>
         Editor: Scott Mansfield
                 <scott.mansfield@ericsson.com>
         Editor: Min Ye
                 <amy.yemin@huawei.com>
         Editor: Italo Busi
                 <Italo.Busi@huawei.com>
         Editor: Xi Li
                 <Xi.Li@neclab.eu>
         Editor: Daniela Spreafico
                 <daniela.spreafico@nokia.com>
       ";
     description
       "This is a module for microwave topology.

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

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

        This version of this YANG module is part of RFC 9656; see
        the RFC itself for full legal notices.";

     revision 2024-09-30 {
       description
         "Initial revision.";
       reference
         "RFC 9656: A YANG Data Model for Microwave Topology";
     }

     grouping rlt-mode {
       description
         "This grouping provides a flexible definition of the number
          of bonded carriers and protecting carriers of a radio
          link.";
       leaf num-bonded-carriers {
         type uint32;
         mandatory true;
         description
           "Number of bonded carriers.";
       }
       leaf num-protecting-carriers {
         type uint32;
         mandatory true;
         description
           "Number of protecting carriers.";
       }
     }

     grouping microwave-radio-link-attributes {
       description
         "Grouping used for attributes describing a microwave
          radio link.";
       container rlt-mode {
         description
           "This grouping provides a flexible definition of the number
            of bonded carriers and protecting carriers of a radio
            link.";
         uses rlt-mode;
       }
     }

     grouping microwave-carrier-attributes {
       description
         "Grouping used for attributes describing a microwave
          carrier.";
       leaf tx-frequency {
         type uint32;
         units "kHz";
         description
           "Selected transmitter frequency.
            Related to the data node tx-frequency in RFC 8561.";
         reference
           "RFC 8561: A YANG Data Model for Microwave Radio Link";
       }
       leaf actual-rx-frequency {
         type uint32;
         units "kHz";
         config false;
         description
           "Computed receiver frequency.
            Related to the data node actual-rx-frequency in RFC 8561.";
         reference
           "RFC 8561: A YANG Data Model for Microwave Radio Link";
       }
       leaf channel-separation {
         type uint32;
         units "kHz";
         description
           "The amount of bandwidth allocated to a carrier.  The
            distance between adjacent channels in a radio
            frequency channel arrangement.
            Related to the data node channel-separation in RFC 8561.";
         reference
           "ETSI EN 302 217-1 and
            RFC 8561: A YANG Data Model for Microwave Radio Link";
       }
       leaf actual-tx-cm {
         type identityref {
           base mw-types:coding-modulation;
         }
         config false;
         description
           "Actual coding/modulation in transmitting direction.
            Related to the data node actual-tx-cm in RFC 8561.";
         reference
           "RFC 8561: A YANG Data Model for Microwave Radio Link";
       }
       leaf actual-snir {
         type decimal64 {
           fraction-digits 1;
         }
         units "dB";
         config false;
         description
           "Actual signal-to-noise plus the interference ratio
            (0.1 dB resolution).
            Related to the data node actual-snir in RFC 8561.";
         reference
           "RFC 8561: A YANG Data Model for Microwave Radio Link";
       }
       leaf actual-transmitted-level {
         type decimal64 {
           fraction-digits 1;
         }
         units "dBm";
         config false;
         description
           "Actual transmitted power level (0.1 dBm resolution).
            Related to the data node actual-transmitted-level
            in RFC 8561.";
         reference
           "ETSI EN 301 129 and
            RFC 8561: A YANG Data Model for Microwave Radio Link";
       }
     }

     grouping microwave-bandwidth {
       description
         "Grouping used for microwave bandwidth.";
       leaf mw-bandwidth {
         type uint64;
         units "bits/seconds";
         config false;
         description
           "Nominal microwave radio link and carrier bandwidth.";
       }
     }

     augment "/nw:networks/nw:network/nw:network-types/"
           + "tet:te-topology" {
       description
         "Augment network types to define a microwave network
          topology type.";
       container mw-topology {
         presence "Indicates a topology type of microwave.";
         description
           "Microwave topology type";
       }
     }

     augment "/nw:networks/nw:network/nw:node/tet:te"
           + "/tet:te-node-attributes" {
       when '../../../nw:network-types'
          + '/tet:te-topology/mwt:mw-topology' {
         description
           "Augmentation parameters apply only to networks with a
            microwave network topology type.";
       }
       description
         "Augment network node to indicate a microwave node.";
       container mw-node {
         presence "Indicates a microwave node.";
         description
           "Microwave node";
       }
     }

     augment "/nw:networks/nw:network/nw:node/nt:termination-point/"
           + "tet:te" {
       when '../../../nw:network-types/tet:te-topology/'
          + 'mwt:mw-topology' {
         description
           "Augmentation parameters apply only for networks with a
            microwave network topology type.";
       }
       description
         "Augmentation to add microwave-technology-specific
          characteristics to a termination point.";
       container mw-tp {
         presence "Denotes a microwave termination point.";
         description
           "Specification of type of termination point.";
         choice mw-tp-option {
           description
             "Selection of type of termination point.";
           case microwave-rltp {
             container microwave-rltp {
               presence
                 "Denotes a microwave radio link termination point.
                  It corresponds to a microwave RLT interface as
                  defined in RFC 8561.";
               description
                 "Denotes and describes a microwave radio link
                  termination point.";
               reference
                 "RFC 8561: A YANG Data Model for Microwave Radio Link";
             }
           }
           case microwave-ctp {
             container microwave-ctp {
               presence "Denotes a microwave carrier termination point.
                         It corresponds to a microwave CT interface as
                         defined in RFC 8561.";
               description
                 "Denotes and describes a microwave carrier
                  termination point.";
               reference
                 "RFC 8561: A YANG Data Model for Microwave Radio Link";
             }
           }
         }
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes" {
       when '../../../nw:network-types/tet:te-topology/'
          + 'mwt:mw-topology' {
         description
           "Augmentation parameters apply only for networks with a
            microwave network topology type.";
       }
       description
         "Augmentation to add microwave-technology-specific
          characteristics to a link.";
       container mw-link {
         presence "This indicates a microwave link";
         description
           "Specification of type of link.";
         choice mw-link-option {
           mandatory true;
           description
             "Selection of type of link.";
           case microwave-radio-link {
             container microwave-radio-link {
               presence "Denotes a microwave radio link";
               description
                 "Denotes and describes a microwave radio link.";
               uses microwave-radio-link-attributes;
             }
           }
           case microwave-carrier {
             container microwave-carrier {
               presence "Denotes a microwave carrier";
               description
                 "Denotes and describes a microwave carrier.";
               uses microwave-carrier-attributes;
             }
           }
         }
       }
     }

     augment "/nw:networks/nw:network/nt:link/tet:te/"
           + "tet:te-link-attributes/"
           + "tet:max-link-bandwidth/"
           + "tet:te-bandwidth" {
       when '../../../../../nw:network-types/tet:te-topology/'
          + 'mwt:mw-topology' {
         description
           "Augmentation parameters apply only for networks with a
            microwave network topology type.";
       }
       description
         "Augmentation for TE bandwidth.";
       uses microwave-bandwidth;
     }
   }
   <CODE ENDS>

3.  Security Considerations

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

   The NETCONF access control model [RFC8341] provides the means to
   restrict access for particular NETCONF or RESTCONF users to a
   preconfigured subset of all available NETCONF or RESTCONF protocol
   operations and content.

   The YANG module specified in this document imports and augments the
   ietf-network and ietf-network-topology models defined in [RFC8345].
   The security considerations from [RFC8345] are applicable to the
   module in this document.

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

   *  rlt-mode: A malicious client could attempt to modify the mode in
      which the radio link is configured and, thereby, change the
      intended behavior of the link.

   *  tx-frequency and channel-separation: A malicious client could
      attempt to modify the frequency configuration of a carrier, which
      could modify the intended behavior or make the configuration
      invalid and, thereby, stop the operation of it.

4.  IANA Considerations

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

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

   IANA has recorded the YANG module names in the "YANG Module Names"
   registry [RFC6020] as follows:

   Name:  ietf-microwave-topology
   Maintained by IANA?:  N
   Namespace:  urn:ietf:params:xml:ns:yang:ietf-microwave-topology
   Prefix:  mwt
   Reference:  RFC 9656

5.  References

5.1.  Normative References

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

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

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

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

   [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>.

   [RFC8561]  Ahlberg, J., Ye, M., Li, X., Spreafico, D., and M.
              Vaupotic, "A YANG Data Model for Microwave Radio Link",
              RFC 8561, DOI 10.17487/RFC8561, June 2019,
              <https://www.rfc-editor.org/info/rfc8561>.

   [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>.

5.2.  Informative References

   [EN301129] ETSI, "Transmission and Multiplexing (TM); Digital Radio
              Relay Systems (DRRS); Synchronous Digital Hierarchy (SDH);
              System performance monitoring parameters of SDH DRRS", EN
              301 129 V1.1.2, May 1999, <https://www.etsi.org/deliver/
              etsi_en/301100_301199/301129/01.01.02_60/
              en_301129v010102p.pdf>.

   [EN302217-1]
              ETSI, "Fixed Radio Systems; Characteristics and
              requirements for point-to-point equipment and antennas;
              Part 1: Overview, common characteristics and system-
              dependent requirements", EN 302 217-1 V3.1.1, May 2017,
              <https://www.etsi.org/deliver/
              etsi_en/302200_302299/30221701/03.01.01_60/
              en_30221701v030101p.pdf>.

   [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>.

   [RFC8453]  Ceccarelli, D., Ed. and Y. Lee, Ed., "Framework for
              Abstraction and Control of TE Networks (ACTN)", RFC 8453,
              DOI 10.17487/RFC8453, August 2018,
              <https://www.rfc-editor.org/info/rfc8453>.

   [RFC8792]  Watsen, K., Auerswald, E., Farrel, A., and Q. Wu,
              "Handling Long Lines in Content of Internet-Drafts and
              RFCs", RFC 8792, DOI 10.17487/RFC8792, June 2020,
              <https://www.rfc-editor.org/info/rfc8792>.

   [RFC8944]  Dong, J., Wei, X., Wu, Q., Boucadair, M., and A. Liu, "A
              YANG Data Model for Layer 2 Network Topologies", RFC 8944,
              DOI 10.17487/RFC8944, November 2020,
              <https://www.rfc-editor.org/info/rfc8944>.

   [YANG-BWA-TOPO]
              Ahlberg, J., Mansfield, S., Ye, M., Busi, I., Li, X., and
              D. Spreafico, "A YANG Data Model for Bandwidth
              Availability Topology", Work in Progress, Internet-Draft,
              draft-ietf-ccamp-bwa-topo-yang-01, 18 October 2023,
              <https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-
              bwa-topo-yang-01>.

   [YANG-IF-REF-TOPO]
              Ahlberg, J., Mansfield, S., Ye, M., Busi, I., Li, X., and
              D. Spreafico, "A YANG Data Model for Interface Reference
              Topology", Work in Progress, Internet-Draft, draft-ietf-
              ccamp-if-ref-topo-yang-01, 18 October 2023,
              <https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-
              if-ref-topo-yang-01>.

Appendix A.  Microwave Topology Model with Base Topology Models

   The tree below shows an example of the relevant leafs for a complete
   Microwave Topology Model including the augmented Network Topology
   Model defined in [RFC8345] and the Traffic Engineering (TE)
   Topologies model defined in [RFC8795].  There are also JSON-based
   instantiations of the Microwave Topology Model for a couple of small
   network examples.

   module: ietf-network
     +--rw networks
        +--rw network* [network-id]
        |  +--rw network-id                    network-id
        |  +--rw network-types
        |  |  +--rw tet:te-topology!
        |  |     +--rw mwt:mw-topology!
        |  +--rw supporting-network* [network-ref]
        |  |  +--rw network-ref    -> /networks/network/network-id
        |  +--rw node* [node-id]
        |  |  +--rw node-id                 node-id
        |  |  +--rw supporting-node* [network-ref node-ref]
        |  |  |  +--rw network-ref
        |  |  |  |       -> ../../../supporting-network/network-ref
        |  |  |  +--rw node-ref       -> /networks/network/node/node-id
        |  |  +--rw nt:termination-point* [tp-id]
        |  |  |  +--rw nt:tp-id                           tp-id
        |  |  |  +--rw nt:supporting-termination-point*
        |  |  |  |       [network-ref node-ref tp-ref]
        |  |  |  |  +--rw nt:network-ref
        |  |  |  |  |       -> ../../../nw:supporting-node/network-ref
        |  |  |  |  +--rw nt:node-ref
        |  |  |  |  |       -> ../../../nw:supporting-node/node-ref
        |  |  |  |  +--rw nt:tp-ref         leafref
        |  |  |  +--rw tet:te-tp-id?
        |  |  |  |       te-types:te-tp-id
        |  |  |  +--rw tet:te!
        |  |  |     +--rw tet:name?                             string
        |  |  |     +--ro tet:geolocation
        |  |  |     |  +--ro tet:altitude?    int64
        |  |  |     |  +--ro tet:latitude?
        |  |  |     |  |       geographic-coordinate-degree
        |  |  |     |  +--ro tet:longitude?
        |  |  |     |          geographic-coordinate-degree
        |  |  |     +--rw mwt:mw-tp!
        |  |  |        +--rw (mwt:mw-tp-option)?
        |  |  |           +--:(mwt:microwave-rltp)
        |  |  |           |  +--rw mwt:microwave-rltp!
        |  |  |           +--:(mwt:microwave-ctp)
        |  |  |              +--rw mwt:microwave-ctp!
        |  |  +--rw tet:te-node-id?         te-types:te-node-id
        |  +--rw nt:link* [link-id]
        |  |  +--rw nt:link-id            link-id
        |  |  +--rw nt:source
        |  |  |  +--rw nt:source-node?   -> ../../../nw:node/node-id
        |  |  |  +--rw nt:source-tp?     leafref
        |  |  +--rw nt:destination
        |  |  |  +--rw nt:dest-node?   -> ../../../nw:node/node-id
        |  |  |  +--rw nt:dest-tp?     leafref
        |  |  +--rw nt:supporting-link* [network-ref link-ref]
        |  |  |  +--rw nt:network-ref
        |  |  |  |       -> ../../../nw:supporting-network/network-ref
        |  |  |  +--rw nt:link-ref       leafref
        |  |  +--rw tet:te!
        |  |     +--rw (tet:bundle-stack-level)?
        |  |     |  +--:(tet:bundle)
        |  |     |  |  +--rw tet:bundled-links
        |  |     |  |     +--rw tet:bundled-link* [sequence]
        |  |     |  |        +--rw tet:sequence      uint32
        |  |     |  |        +--rw tet:src-tp-ref?   leafref
        |  |     |  |        +--rw tet:des-tp-ref?   leafref
        |  |     +--rw tet:te-link-attributes
        |  |     |  +--rw tet:name?                             string
        |  |     |  +--rw tet:max-link-bandwidth
        |  |     |  |  +--rw tet:te-bandwidth
        |  |     |  |     +--ro mwt:mw-bandwidth?    uint64
        |  |     |  +--rw mwt:mw-link!
        |  |     |     +--rw (mwt:mw-link-option)
        |  |     |        +--:(mwt:microwave-radio-link)
        |  |     |        |  +--rw mwt:microwave-radio-link!
        |  |     |        |     +--rw mwt:rlt-mode
        |  |     |        |        +--rw mwt:num-bonded-carriers
        |  |     |        |        |       uint32
        |  |     |        |        +--rw mwt:num-protecting-carriers
        |  |     |        |                uint32
        |  |     |        +--:(mwt:microwave-carrier)
        |  |     |           +--rw mwt:microwave-carrier!
        |  |     |              +--rw mwt:tx-frequency?
        |  |     |              |       uint32
        |  |     |              +--ro mwt:actual-rx-frequency?
        |  |     |              |       uint32
        |  |     |              +--rw mwt:channel-separation?
        |  |     |              |       uint32
        |  |     |              +--ro mwt:actual-tx-cm?
        |  |     |              |       identityref
        |  |     |              +--ro mwt:actual-snir?
        |  |     |              |       decimal64
        |  |     |              +--ro mwt:actual-transmitted-level?
        |  |     |                      decimal64

            Figure 2: Microwave Topology with Augmentations Tree

   The Microwave Topology Model augments the TE Topology Model.

        Node N1                            Node N2
   +--------------+                   +--------------+
   | +----------+ |                   | +----------+ | L2-network
   | |L2-N1-TP1 | |     L2-N1-N2      | |L2-N2-TP2 | | -L2 topology
   | |          o<--------------------->o          | |
   | +----------+ |         '         | +----------+ | Supporting
   |          :   |         '         |   :          | ' mw link
   |          :   |         '         |   :          | : TPs
   | +----------+ |         '         | +----------+ |
   | |mw-N1-    | |    mwrl-N1-N2     | | mw-N2-   | | MW-network
   | |RLTP1     o<----------*---------->o RLTP2    | | -MW topology
   | +----------+ |        / \        | +----------+ |
   |         : :  |       /   \       |  : :         |
   |         ::   |      /     \      |   ::         | Supporting
   | +-------:--+ |     /       \     | +--:-------+ | : TPs
   | |mw-N1- :  *---+--'         '--+---*  : mw-N2-| | * carriers
   | |CTP1   :  o<--|---------------|-->o  : CTP2  | |   as bundled
   | +-------:--+ | |  mwc-N1-N2-A  | | +--:-------+ |   links
   |           :  | |               | |  :           |
   | +----------+ | |               | | +----------+ |
   | |mw-N1-CTP3*---'               '---*mw-N2-CTP4| |
   | |          o<--------------------->o          | |
   | +----------+ |    mwc-N1-N2-B    | +----------+ |
   +--------------+                   +--------------+

                  Figure 3: Example for L2 over Microwave

A.1.  Instance Data for 2+0 Mode for a Bonded Configuration

   An L2 network with a supporting microwave network, showing a 2+0
   microwave configuration is provided below.  The num-bonded-carriers =
   2, and the num-protecting-carriers = 0.  This means both carriers are
   active, so there is no redundancy and there is more capacity.  The
   JSON encoding of the 2+0 example data follows:

   {
     "ietf-network:networks": {
       "network": [
         {
           "network-id": "L2-network",
           "network-types": {
             "ietf-te-topology:te-topology": {}
           },
           "supporting-network": [
             {
               "network-ref": "mw-network"
             }
           ],
           "node": [
             {
               "node-id": "L2-N1",
               "supporting-node": [
                 {
                   "network-ref": "mw-network",
                   "node-ref": "mw-N1"
                 }
               ],
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "L2-N1-TP1",
                   "supporting-termination-point": [
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N1",
                       "tp-ref": "mw-N1-RLTP1"
                     }
                   ]
                 }
               ]
             },
             {
               "node-id": "L2-N2",
               "supporting-node": [
                 {
                   "network-ref": "mw-network",
                   "node-ref": "mw-N2"
                 }
               ],
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "L2-N2-TP2",
                   "supporting-termination-point": [
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N2",
                       "tp-ref": "mw-N2-RLTP2"
                     }
                   ]
                 }
               ]
             }
           ],
           "ietf-network-topology:link": [
             {
               "link-id": "L2-N1-N2",
               "source": {
                 "source-node": "L2-N1",
                 "source-tp": "L2-N1-TP1"
               },
               "destination": {
                 "dest-node": "L2-N2",
                 "dest-tp": "L2-N2-TP2"
               },
               "supporting-link": [
                 {
                   "network-ref": "mw-network",
                   "link-ref": "mwrl-N1-N2"
                 }
               ]
             }
           ]
         },
         {
           "network-id": "mw-network",
           "network-types": {
             "ietf-te-topology:te-topology": {
               "ietf-microwave-topology:mw-topology": {}
             }
           },
           "supporting-network": [
             {
               "network-ref": "mw-network"
             }
           ],
           "node": [
             {
               "node-id": "mw-N1",
               "supporting-node": [
                 {
                   "network-ref": "mw-network",
                   "node-ref": "mw-N1"
                 }
               ],
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "mw-N1-RLTP1",
                   "supporting-termination-point": [
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N1",
                       "tp-ref": "mw-N1-CTP1"
                     },
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N1",
                       "tp-ref": "mw-N1-CTP3"
                     }
                   ],
                   "ietf-te-topology:te-tp-id": "192.0.2.3",
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-rltp": {}
                     }
                   }
                 },
                 {
                   "tp-id": "mw-N1-CTP1",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-ctp": {}
                     }
                   }
                 },
                 {
                   "tp-id": "mw-N1-CTP3",
                   "ietf-te-topology:te-tp-id": 2,
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-ctp": {}
                     }
                   }
                 }
               ]
             },
             {
               "node-id": "mw-N2",
               "supporting-node": [
                 {
                   "network-ref": "mw-network",
                   "node-ref": "mw-N2"
                 }
               ],
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "mw-N2-RLTP2",
                   "supporting-termination-point": [
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N2",
                       "tp-ref": "mw-N2-CTP2"
                     },
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N2",
                       "tp-ref": "mw-N2-CTP4"
                     }
                   ],
                   "ietf-te-topology:te-tp-id": "192.0.2.4",
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-rltp": {}
                     }
                   }
                 },
                 {
                   "tp-id": "mw-N2-CTP2",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-ctp": {}
                     }
                   }
                 },
                 {
                   "tp-id": "mw-N2-CTP4",
                   "ietf-te-topology:te-tp-id": 2,
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-ctp": {}
                     }
                   }
                 }
               ]
             }
           ],
           "ietf-network-topology:link": [
             {
               "link-id": "mwrl-N1-N2",
               "source": {
                 "source-node": "mw-N1",
                 "source-tp": "mw-N1-RLTP1"
               },
               "destination": {
                 "dest-node": "mw-N2",
                 "dest-tp": "mw-N2-RLTP2"
               },
               "ietf-te-topology:te": {
                 "bundled-links": {
                   "bundled-link": [
                     {
                       "sequence": 1,
                       "src-tp-ref": "mw-N1-CTP1",
                       "des-tp-ref": "mw-N2-CTP2"
                     },
                     {
                       "sequence": 2,
                       "src-tp-ref": "mw-N1-CTP3",
                       "des-tp-ref": "mw-N2-CTP4"
                     }
                   ]
                 },
                 "te-link-attributes": {
                   "ietf-microwave-topology:mw-link": {
                     "microwave-radio-link": {
                       "rlt-mode": {
                         "num-bonded-carriers": 2,
                         "num-protecting-carriers": 0
                       }
                     }
                   }
                 }
               }
             },
             {
               "link-id": "mwc-N1-N2-A",
               "source": {
                 "source-node": "mw-N1",
                 "source-tp": "mw-N1-CTP1"
               },
               "destination": {
                 "dest-node": "mw-N2",
                 "dest-tp": "mw-N2-CTP2"
               },
               "ietf-te-topology:te": {
                 "te-link-attributes": {
                   "ietf-microwave-topology:mw-link": {
                     "microwave-carrier": {
                       "tx-frequency": 10728000,
                       "channel-separation": 28000
                     }
                   }
                 }
               }
             },
             {
               "link-id": "mwc-N1-N2-B",
               "source": {
                 "source-node": "mw-N1",
                 "source-tp": "mw-N1-CTP3"
               },
               "destination": {
                 "dest-node": "mw-N2",
                 "dest-tp": "mw-N2-CTP4"
               },
               "ietf-te-topology:te": {
                 "te-link-attributes": {
                   "ietf-microwave-topology:mw-link": {
                     "microwave-carrier": {
                       "tx-frequency": 10528000,
                       "channel-separation": 28000
                     }
                   }
                 }
               }
             }
           ]
         }
       ]
     }
   }

A.2.  Instance Data for 1+1 Mode for a Protected Configuration

   An L2 network with a supporting microwave network, showing a 1+1
   microwave configuration is provided below.  The num-bonded-carriers =
   1, and the num-protecting-carriers = 1.  This means there is a
   standby carrier protecting the active carrier.  The JSON encoding of
   the 1+1 example data follows:

   {
     "ietf-network:networks": {
       "network": [
         {
           "network-id": "L2-network",
           "network-types": {
             "ietf-te-topology:te-topology": {}
           },
           "supporting-network": [
             {
               "network-ref": "mw-network"
             }
           ],
           "node": [
             {
               "node-id": "L2-N1",
               "supporting-node": [
                 {
                   "network-ref": "mw-network",
                   "node-ref": "mw-N1"
                 }
               ],
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "L2-N1-TP1",
                   "supporting-termination-point": [
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N1",
                       "tp-ref": "mw-N1-RLTP1"
                     }
                   ]
                 }
               ]
             },
             {
               "node-id": "L2-N2",
               "supporting-node": [
                 {
                   "network-ref": "mw-network",
                   "node-ref": "mw-N2"
                 }
               ],
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "L2-N2-TP2",
                   "supporting-termination-point": [
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N2",
                       "tp-ref": "mw-N2-RLTP2"
                     }
                   ]
                 }
               ]
             }
           ],
           "ietf-network-topology:link": [
             {
               "link-id": "L2-N1-N2",
               "source": {
                 "source-node": "L2-N1",
                 "source-tp": "L2-N1-TP1"
               },
               "destination": {
                 "dest-node": "L2-N2",
                 "dest-tp": "L2-N2-TP2"
               },
               "supporting-link": [
                 {
                   "network-ref": "mw-network",
                   "link-ref": "mwrl-N1-N2"
                 }
               ]
             }
           ]
         },
         {
           "network-id": "mw-network",
           "network-types": {
             "ietf-te-topology:te-topology": {
               "ietf-microwave-topology:mw-topology": {}
             }
           },
           "supporting-network": [
             {
               "network-ref": "mw-network"
             }
           ],
           "node": [
             {
               "node-id": "mw-N1",
               "supporting-node": [
                 {
                   "network-ref": "mw-network",
                   "node-ref": "mw-N1"
                 }
               ],
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "mw-N1-RLTP1",
                   "supporting-termination-point": [
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N1",
                       "tp-ref": "mw-N1-CTP1"
                     },
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N1",
                       "tp-ref": "mw-N1-CTP3"
                     }
                   ],
                   "ietf-te-topology:te-tp-id": "192.0.2.3",
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-rltp": {}
                     }
                   }
                 },
                 {
                   "tp-id": "mw-N1-CTP1",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-ctp": {}
                     }
                   }
                 },
                 {
                   "tp-id": "mw-N1-CTP3",
                   "ietf-te-topology:te-tp-id": 2,
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-ctp": {}
                     }
                   }
                 }
               ]
             },
             {
               "node-id": "mw-N2",
               "supporting-node": [
                 {
                   "network-ref": "mw-network",
                   "node-ref": "mw-N2"
                 }
               ],
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "mw-N2-RLTP2",
                   "supporting-termination-point": [
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N2",
                       "tp-ref": "mw-N2-CTP2"
                     },
                     {
                       "network-ref": "mw-network",
                       "node-ref": "mw-N2",
                       "tp-ref": "mw-N2-CTP4"
                     }
                   ],
                   "ietf-te-topology:te-tp-id": "192.0.2.4",
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-rltp": {}
                     }
                   }
                 },
                 {
                   "tp-id": "mw-N2-CTP2",
                   "ietf-te-topology:te-tp-id": 1,
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-ctp": {}
                     }
                   }
                 },
                 {
                   "tp-id": "mw-N2-CTP4",
                   "ietf-te-topology:te-tp-id": 2,
                   "ietf-te-topology:te": {
                     "ietf-microwave-topology:mw-tp": {
                       "microwave-ctp": {}
                     }
                   }
                 }
               ]
             }
           ],
           "ietf-network-topology:link": [
             {
               "link-id": "mwrl-N1-N2",
               "source": {
                 "source-node": "mw-N1",
                 "source-tp": "mw-N1-RLTP1"
               },
               "destination": {
                 "dest-node": "mw-N2",
                 "dest-tp": "mw-N2-RLTP2"
               },
               "ietf-te-topology:te": {
                 "bundled-links": {
                   "bundled-link": [
                     {
                       "sequence": 1,
                       "src-tp-ref": "mw-N1-CTP1",
                       "des-tp-ref": "mw-N2-CTP2"
                     },
                     {
                       "sequence": 2,
                       "src-tp-ref": "mw-N1-CTP3",
                       "des-tp-ref": "mw-N2-CTP4"
                     }
                   ]
                 },
                 "te-link-attributes": {
                   "ietf-microwave-topology:mw-link": {
                     "microwave-radio-link": {
                       "rlt-mode": {
                         "num-bonded-carriers": 1,
                         "num-protecting-carriers": 1
                       }
                     }
                   }
                 }
               }
             },
             {
               "link-id": "mwc-N1-N2-A",
               "source": {
                 "source-node": "mw-N1",
                 "source-tp": "mw-N1-CTP1"
               },
               "destination": {
                 "dest-node": "mw-N2",
                 "dest-tp": "mw-N2-CTP2"
               },
               "ietf-te-topology:te": {
                 "te-link-attributes": {
                   "ietf-microwave-topology:mw-link": {
                     "microwave-carrier": {
                       "tx-frequency": 10728000,
                       "channel-separation": 28000
                     }
                   }
                 }
               }
             },
             {
               "link-id": "mwc-N1-N2-B",
               "source": {
                 "source-node": "mw-N1",
                 "source-tp": "mw-N1-CTP3"
               },
               "destination": {
                 "dest-node": "mw-N2",
                 "dest-tp": "mw-N2-CTP4"
               },
               "ietf-te-topology:te": {
                 "te-link-attributes": {
                   "ietf-microwave-topology:mw-link": {
                     "microwave-carrier": {
                       "tx-frequency": 10728000,
                       "channel-separation": 28000
                     }
                   }
                 }
               }
             }
           ]
         }
       ]
     }
   }

Appendix B.  Microwave Topology Model with Example Extensions

   This non-normative appendix provides examples of how the Microwave
   Topology Model can be used with the interface reference topology
   (ifref) [YANG-IF-REF-TOPO] and the bandwidth-availability-topology
   (bwa) [YANG-BWA-TOPO] models.  There is also a snippet of JSON to
   show geolocation information instance data.  When the JSON files have
   long lines, the long lines are wrapped as described in [RFC8792].

   The tree below shows an example of the relevant leafs for a complete
   Microwave Topology Model including interface reference topology
   (ifref) [YANG-IF-REF-TOPO] and bandwidth-availability-topology (bwa)
   [YANG-BWA-TOPO] models.

   module: ietf-network
     +--rw networks
        +--rw network* [network-id]
        |  +--rw network-id                    network-id
        |  +--rw network-types
        |  |  +--rw tet:te-topology!
        |  |     +--rw mwt:mw-topology!
        |  +--rw supporting-network* [network-ref]
        |  |  +--rw network-ref    -> /networks/network/network-id
        |  +--rw node* [node-id]
        |  |  +--rw node-id                 node-id
        |  |  +--rw supporting-node* [network-ref node-ref]
        |  |  |  +--rw network-ref
        |  |  |  |       -> ../../../supporting-network/network-ref
        |  |  |  +--rw node-ref       -> /networks/network/node/node-id
        |  |  +--rw nt:termination-point* [tp-id]
        |  |  |  +--rw nt:tp-id                           tp-id
        |  |  |  +--rw nt:supporting-termination-point*
        |  |  |  |       [network-ref node-ref tp-ref]
        |  |  |  |  +--rw nt:network-ref
        |  |  |  |  |       -> ../../../nw:supporting-node/network-ref
        |  |  |  |  +--rw nt:node-ref
        |  |  |  |  |       -> ../../../nw:supporting-node/node-ref
        |  |  |  |  +--rw nt:tp-ref         leafref
        |  |  |  +--rw tet:te-tp-id?
        |  |  |  |       te-types:te-tp-id
        |  |  |  +--rw tet:te!
        |  |  |     +--rw tet:name?                             string
        |  |  |     +--ro tet:geolocation
        |  |  |     |  +--ro tet:altitude?    int64
        |  |  |     |  +--ro tet:latitude?
        |  |  |     |  |       geographic-coordinate-degree
        |  |  |     |  +--ro tet:longitude?
        |  |  |     |          geographic-coordinate-degree
        |  |  |     +--rw mwt:mw-tp!
        |  |  |     |  +--rw (mwt:mw-tp-option)?
        |  |  |     |     +--:(mwt:microwave-rltp)
        |  |  |     |     |  +--rw mwt:microwave-rltp!
        |  |  |     |     +--:(mwt:microwave-ctp)
        |  |  |     |        +--rw mwt:microwave-ctp!
        |  |  |     +--rw ifref:tp-to-interface-path?
        |  |  |             -> /if:interfaces/interface/name
        |  |  +--rw tet:te-node-id?         te-types:te-node-id
        |  +--rw nt:link* [link-id]
        |  |  +--rw nt:link-id            link-id
        |  |  +--rw nt:source
        |  |  |  +--rw nt:source-node?   -> ../../../nw:node/node-id
        |  |  |  +--rw nt:source-tp?     leafref
        |  |  +--rw nt:destination
        |  |  |  +--rw nt:dest-node?   -> ../../../nw:node/node-id
        |  |  |  +--rw nt:dest-tp?     leafref
        |  |  +--rw nt:supporting-link* [network-ref link-ref]
        |  |  |  +--rw nt:network-ref
        |  |  |  |       -> ../../../nw:supporting-network/network-ref
        |  |  |  +--rw nt:link-ref       leafref
        |  |  +--rw tet:te!
        |  |     +--rw (tet:bundle-stack-level)?
        |  |     |  +--:(tet:bundle)
        |  |     |  |  +--rw tet:bundled-links
        |  |     |  |     +--rw tet:bundled-link* [sequence]
        |  |     |  |        +--rw tet:sequence      uint32
        |  |     |  |        +--rw tet:src-tp-ref?   leafref
        |  |     |  |        +--rw tet:des-tp-ref?   leafref
        |  |     +--rw tet:te-link-attributes
        |  |     |  +--rw tet:name?                             string
        |  |     |  +--rw tet:max-link-bandwidth
        |  |     |  |  +--rw tet:te-bandwidth
        |  |     |  |     +--ro mwt:mw-bandwidth?    uint64
        |  |     |  +--rw mwt:mw-link!
        |  |     |  |  +--rw (mwt:mw-link-option)
        |  |     |  |     +--:(mwt:microwave-radio-link)
        |  |     |  |     |  +--rw mwt:microwave-radio-link!
        |  |     |  |     |     +--rw mwt:rlt-mode
        |  |     |  |     |        +--rw mwt:num-bonded-carriers
        |  |     |  |     |        |       uint32
        |  |     |  |     |        +--rw mwt:num-protecting-carriers
        |  |     |  |     |                uint32
        |  |     |  |     +--:(mwt:microwave-carrier)
        |  |     |  |        +--rw mwt:microwave-carrier!
        |  |     |  |           +--rw mwt:tx-frequency?
        |  |     |  |           |       uint32
        |  |     |  |           +--ro mwt:actual-rx-frequency?
        |  |     |  |           |       uint32
        |  |     |  |           +--rw mwt:channel-separation?
        |  |     |  |           |       uint32
        |  |     |  |           +--ro mwt:actual-tx-cm?
        |  |     |  |           |       identityref
        |  |     |  |           +--ro mwt:actual-snir?
        |  |     |  |           |       decimal64
        |  |     |  |           +--ro mwt:actual-transmitted-level?
        |  |     |  |                   decimal64
        |  |     |  +--rw bwatopo:link-availability* [availability]
        |  |     |  |  +--rw bwatopo:availability      decimal64
        |  |     |  |  +--rw bwatopo:link-bandwidth?   uint64
        |  |     |  +--ro bwatopo:actual-bandwidth?
        |  |     |          yang:gauge64

             Figure 4: Microwave Topology with Extensions Tree

   Microwave is a transport technology that can be used to transport
   client services, such as L2 Ethernet links.  When an L2 link is
   transported over a single supporting microwave radio link, the
   topologies could be as shown below.  Note that the figure just shows
   an example: there might be other possibilities to demonstrate such a
   topology.  The example of the instantiation encoded in JSON is using
   only a selected subset of the leafs from the L2 topology model
   [RFC8944].  The example below uses Figure 3 and adds the interface-
   related information.

        Node N1                            Interfaces
   +---------------+                    +----------------+
   | +-----------+ |tp-to-interface-path| +------------+ |
   | | L2-N1-TP1 |<---------------------->|L2Interface1| |
   | +-----------+ |                    | +------------+ |
   |               |                    |                |
   | +-----------+ |tp-to-interface-path| +------------+ |
   | |mw-N1-RLTP1|<---------------------->|   RLT-1    | |
   | +-----------+ |                    | +------------+ |
   |               |                    |                |
   | +-----------+ |tp-to-interface-path| +------------+ |
   | |mw-N1-CTP1 |<---------------------->|    CT-1    | |
   | +-----------+ |                    | +------------+ |
   |               |                    |                |
   | +-----------+ |tp-to-interface-path| +------------+ |
   | |mw-N1-CTP3 |<---------------------->|    CT-3    | |
   | +-----------+ |                    | +------------+ |
   +---------------+                    +----------------+

   -------------------------------------------------------

        Node N2                            Interfaces
   +---------------+                    +----------------+
   | +-----------+ |tp-to-interface-path| +------------+ |
   | | L2-N2-TP2 |<---------------------->|L2Interface2| |
   | +-----------+ |                    | +------------+ |
   |               |                    |                |
   | +-----------+ |tp-to-interface-path| +------------+ |
   | |mw-N2-RLTP2|<---------------------->|   RLT-2    | |
   | +-----------+ |                    | +------------+ |
   |               |                    |                |
   | +-----------+ |tp-to-interface-path| +------------+ |
   | |mw-N2-CTP2 |<---------------------->|    CT-2    | |
   | +-----------+ |                    | +------------+ |
   |               |                    |                |
   | +-----------+ |tp-to-interface-path| +------------+ |
   | |mw-N2-CTP4 |<---------------------->|    CT-4    | |
   | +-----------+ |                    | +------------+ |
   +---------------+                    +----------------+

        Figure 5: Interface Extension Example for L2 over Microwave

B.1.  Instance Data for 2+0 Mode

   An L2 network with a supporting microwave network, including
   microwave-topology (mw) and bandwidth-availability-topology (bwa)
   models as well as the reference to the associated interface
   management information, is encoded in JSON as follows:

   {
    "ietf-interfaces:interfaces": {
     "interface": [
      {
       "name": "L2Interface1",
       "description": "'Ethernet Interface 1'",
       "type": "iana-if-type:ethernetCsmacd"
      },
      {
       "name": "L2Interface2",
       "description": "'Ethernet Interface 2'",
       "type": "iana-if-type:ethernetCsmacd"
      },
      {
       "name": "RLT-1",
       "description": "'Radio Link Terminal 1'",
       "type": "iana-if-type:microwaveRadioLinkTerminal",
       "ietf-microwave-radio-link:mode":
         "ietf-microwave-types:two-plus-zero",
       "ietf-microwave-radio-link:carrier-terminations": [
        "CT-1",
        "CT-3"
       ]
      },
      {
       "name": "RLT-2",
       "description": "'Radio Link Terminal 2'",
       "type": "iana-if-type:microwaveRadioLinkTerminal",
       "ietf-microwave-radio-link:mode":
          "ietf-microwave-types:two-plus-zero",
       "ietf-microwave-radio-link:carrier-terminations": [
        "CT-2",
        "CT-4"
       ]
      },
      {
       "name": "CT-1",
       "description": "'Carrier Termination 1'",
       "type": "iana-if-type:microwaveCarrierTermination",
       "ietf-microwave-radio-link:tx-frequency": 10728000,
       "ietf-microwave-radio-link:duplex-distance": 113000,
       "ietf-microwave-radio-link:channel-separation": 28000,
       "ietf-microwave-radio-link:rtpc": {
        "maximum-nominal-power": "20.0"
       },
       "ietf-microwave-radio-link:single": {
        "selected-cm": "ietf-microwave-types:qam-512"
       }
      },
      {
       "name": "CT-3",
       "description": "'Carrier Termination 3'",
       "type": "iana-if-type:microwaveCarrierTermination",
       "ietf-microwave-radio-link:tx-frequency": 10528000,
       "ietf-microwave-radio-link:duplex-distance": 113000,
       "ietf-microwave-radio-link:channel-separation": 28000,
       "ietf-microwave-radio-link:rtpc": {
        "maximum-nominal-power": "20.0"
       },
       "ietf-microwave-radio-link:single": {
        "selected-cm": "ietf-microwave-types:qam-512"
       }
      },
      {
       "name": "CT-2",
       "description": "'Carrier Termination 2'",
       "type": "iana-if-type:microwaveCarrierTermination",
       "ietf-microwave-radio-link:tx-frequency": 10615000,
       "ietf-microwave-radio-link:duplex-distance": 113000,
       "ietf-microwave-radio-link:channel-separation": 28000,
       "ietf-microwave-radio-link:rtpc": {
        "maximum-nominal-power": "20.0"
       },
       "ietf-microwave-radio-link:single": {
        "selected-cm": "ietf-microwave-types:qam-512"
       }
      },
      {
       "name": "CT-4",
       "description": "'Carrier Termination 4'",
       "type": "iana-if-type:microwaveCarrierTermination",
       "ietf-microwave-radio-link:tx-frequency": 10415000,
       "ietf-microwave-radio-link:duplex-distance": 113000,
       "ietf-microwave-radio-link:channel-separation": 28000,
       "ietf-microwave-radio-link:rtpc": {
        "maximum-nominal-power": "20.0"
       },
       "ietf-microwave-radio-link:single": {
        "selected-cm": "ietf-microwave-types:qam-512"
       }
      }
     ]
    },
    "ietf-network:networks": {
     "network": [
      {
       "network-id": "L2-network",
       "network-types": {
        "ietf-te-topology:te-topology": {
         "ietf-eth-te-topology:eth-tran-topology": {}
        }
       },
       "supporting-network": [
        {
         "network-ref": "mw-network"
        }
       ],
       "node": [
        {
         "node-id": "L2-N1",
         "supporting-node": [
          {
           "network-ref": "mw-network",
           "node-ref": "mw-N1"
          }
         ],
         "ietf-network-topology:termination-point": [
          {
           "tp-id": "L2-N1-TP1",
           "supporting-termination-point": [
            {
             "network-ref": "mw-network",
             "node-ref": "mw-N1",
             "tp-ref": "mw-N1-RLTP1"
            }
           ]
          }
         ],
         "ietf-te-topology:te-node-id": "192.0.2.1",
         "ietf-te-topology:te": {
          "te-node-attributes": {
           "ietf-eth-te-topology:eth-node": {}
          }
         }
        },
        {
         "node-id": "L2-N2",
         "supporting-node": [
          {
           "network-ref": "mw-network",
           "node-ref": "mw-N2"
          }
         ],
         "ietf-network-topology:termination-point": [
          {
           "tp-id": "L2-N2-TP2",
           "supporting-termination-point": [
            {
             "network-ref": "mw-network",
             "node-ref": "mw-N2",
             "tp-ref": "mw-N2-RLTP2"
            }
           ]
          }
         ],
         "ietf-te-topology:te-node-id": "192.0.2.2",
         "ietf-te-topology:te": {
          "te-node-attributes": {
           "ietf-eth-te-topology:eth-node": {}
          }
         }
        }
       ],
       "ietf-network-topology:link": [
        {
         "link-id": "L2-N1-N2",
         "source": {
          "source-node": "L2-N1",
          "source-tp": "L2-N1-TP1"
         },
         "destination": {
          "dest-node": "L2-N2",
          "dest-tp": "L2-N2-TP2"
         },
         "supporting-link": [
          {
           "network-ref": "mw-network",
           "link-ref": "mwrl-N1-N2"
          }
         ],
         "ietf-te-topology:te": {
          "te-link-attributes": {
           "interface-switching-capability": [
            {
             "switching-capability": "ietf-te-types:switching-l2sc",
             "encoding": "ietf-te-types:lsp-encoding-ethernet"
            }
           ]
          }
         }
        }
       ]
      },
      {
       "network-id": "mw-network",
       "network-types": {
        "ietf-te-topology:te-topology": {
         "ietf-microwave-topology:mw-topology": {}
        }
       },
       "supporting-network": [
        {
         "network-ref": "mw-network"
        }
       ],
       "node": [
        {
         "node-id": "mw-N1",
         "supporting-node": [
          {
           "network-ref": "mw-network",
           "node-ref": "mw-N1"
          }
         ],
         "ietf-network-topology:termination-point": [
          {
           "tp-id": "mw-N1-RLTP1",
           "supporting-termination-point": [
            {
             "network-ref": "mw-network",
             "node-ref": "mw-N1",
             "tp-ref": "mw-N1-CTP1"
            },
            {
             "network-ref": "mw-network",
             "node-ref": "mw-N1",
             "tp-ref": "mw-N1-CTP3"
            }
           ],
           "ietf-te-topology:te-tp-id": "192.0.2.3",
           "ietf-te-topology:te": {
            "ietf-microwave-topology:mw-tp": {
             "microwave-rltp": {}
            },
            "ietf-tp-interface-reference-topology:tp-to-interface-path":
            "RLT-1"
           }
          },
          {
           "tp-id": "mw-N1-CTP1",
           "ietf-te-topology:te-tp-id": 1,
           "ietf-te-topology:te": {
            "ietf-microwave-topology:mw-tp": {
             "microwave-ctp": {}
            },
            "ietf-tp-interface-reference-topology:tp-to-interface-path":
            "CT-1"
           }
          },
          {
           "tp-id": "mw-N1-CTP3",
           "ietf-te-topology:te-tp-id": 2,
           "ietf-te-topology:te": {
            "ietf-microwave-topology:mw-tp": {
             "microwave-ctp": {}
            },
            "ietf-tp-interface-reference-topology:tp-to-interface-path":
            "CT-3"
           }
          }
         ],
         "ietf-te-topology:te-node-id": "192.0.2.1",
         "ietf-te-topology:te": {
          "te-node-attributes": {
           "ietf-microwave-topology:mw-node": {}
          }
         }
        },
        {
         "node-id": "mw-N2",
         "supporting-node": [
          {
           "network-ref": "mw-network",
           "node-ref": "mw-N2"
          }
         ],
         "ietf-network-topology:termination-point": [
          {
           "tp-id": "mw-N2-RLTP2",
           "supporting-termination-point": [
            {
             "network-ref": "mw-network",
             "node-ref": "mw-N2",
             "tp-ref": "mw-N2-CTP2"
            },
            {
             "network-ref": "mw-network",
             "node-ref": "mw-N2",
             "tp-ref": "mw-N2-CTP4"
            }
           ],
           "ietf-te-topology:te-tp-id": "192.0.2.4",
           "ietf-te-topology:te": {
            "ietf-microwave-topology:mw-tp": {
             "microwave-rltp": {}
            },
            "ietf-tp-interface-reference-topology:tp-to-interface-path":
            "RLT-2"
           }
          },
          {
           "tp-id": "mw-N2-CTP2",
           "ietf-te-topology:te-tp-id": 1,
           "ietf-te-topology:te": {
            "ietf-microwave-topology:mw-tp": {
             "microwave-ctp": {}
            },
            "ietf-tp-interface-reference-topology:tp-to-interface-path":
            "CT-2"
           }
          },
          {
           "tp-id": "mw-N2-CTP4",
           "ietf-te-topology:te-tp-id": 2,
           "ietf-te-topology:te": {
            "ietf-microwave-topology:mw-tp": {
             "microwave-ctp": {}
            },
            "ietf-tp-interface-reference-topology:tp-to-interface-path":
            "CT-4"
           }
          }
         ],
         "ietf-te-topology:te-node-id": "192.0.2.1",
         "ietf-te-topology:te": {
          "te-node-attributes": {
           "ietf-microwave-topology:mw-node": {}
          }
         }
        }
       ],
       "ietf-network-topology:link": [
        {
         "link-id": "mwrl-N1-N2",
         "source": {
          "source-node": "mw-N1",
          "source-tp": "mw-N1-RLTP1"
         },
         "destination": {
          "dest-node": "mw-N2",
          "dest-tp": "mw-N2-RLTP2"
         },
         "ietf-te-topology:te": {
          "bundled-links": {
           "bundled-link": [
            {
             "sequence": 1,
             "src-tp-ref": "mw-N1-CTP1",
             "des-tp-ref": "mw-N2-CTP2"
            },
            {
             "sequence": 2,
             "src-tp-ref": "mw-N1-CTP3",
             "des-tp-ref": "mw-N2-CTP4"
            }
           ]
          },
          "te-link-attributes": {
           "ietf-microwave-topology:mw-link": {
            "microwave-radio-link": {
             "rlt-mode": {
              "num-bonded-carriers": 2,
              "num-protecting-carriers": 0
             }
            }
           }
          }
         }
        },
        {
         "link-id": "mwc-N1-N2-A",
         "source": {
          "source-node": "mw-N1",
          "source-tp": "mw-N1-CTP1"
         },
         "destination": {
          "dest-node": "mw-N2",
          "dest-tp": "mw-N2-CTP2"
         },
         "ietf-te-topology:te": {
          "te-link-attributes": {
           "ietf-bandwidth-availability-topology:link-availability": [
            {
             "availability": "0.99",
             "link-bandwidth": "998423"
            },
            {
             "availability": "0.95",
             "link-bandwidth": "1048576"
            }
           ],
           "ietf-microwave-topology:mw-link": {
            "microwave-carrier": {
             "tx-frequency": 10728000,
             "channel-separation": 28000
            }
           }
          }
         }
        },
        {
         "link-id": "mwc-N1-N2-B",
         "source": {
          "source-node": "mw-N1",
          "source-tp": "mw-N1-CTP3"
         },
         "destination": {
          "dest-node": "mw-N2",
          "dest-tp": "mw-N2-CTP4"
         },
         "ietf-te-topology:te": {
          "te-link-attributes": {
           "ietf-microwave-topology:mw-link": {
            "microwave-carrier": {
             "tx-frequency": 10528000,
             "channel-separation": 28000
            }
           }
          }
         }
        }
       ]
      }
     ]
    }
   }

B.2.  Instance Data for Geolocation Information

   This example provides a JSON snippet that shows geolocation
   information.

      "node": [
         {
            "node-id": "mw-N1",

            ...

            "ietf-te-topology:te" : {
               "ietf-te-topology:geolocation": {
                  "altitude": "200000",
                  "latitude": "45",
                  "longitude": "90"
                  }
            },
            "ietf-network-topology:termination-point": [

            ...

Acknowledgments

   This document was initially prepared using the kramdown RFC tool
   written and maintained by Carsten Bormann.  Thanks to Martin Thomson
   for the GitHub integration of the kramdown RFC tool and for the aasvg
   tool, which is used for the ascii-to-SVG conversion.

   The authors would like to thank Tom Petch, Éric Vyncke, and Rob
   Wilton for their reviews.

Contributors

   Italo Busi
   Huawei Technologies
   Email: italo.busi@huawei.com


Authors' Addresses

   Scott Mansfield (editor)
   Ericsson Inc
   Email: scott.mansfield@ericsson.com


   Jonas Ahlberg
   Ericsson AB
   Lindholmspiren 11
   SE-417 56 Goteborg
   Sweden
   Email: jonas.ahlberg@ericsson.com


   Min Ye
   Huawei Technologies
   No.1899, Xiyuan Avenue
   Chengdu
   611731
   China
   Email: amy.yemin@huawei.com


   Xi Li
   NEC Laboratories Europe
   Kurfursten-Anlage 36
   69115 Heidelberg
   Germany
   Email: Xi.Li@neclab.eu


   Daniela Spreafico
   Nokia - IT
   Via Energy Park, 14
   20871 Vimercate (MI)
   Italy
   Email: daniela.spreafico@nokia.com