A YANG Data Model for Interface Reference Topology
draft-ietf-ccamp-if-ref-topo-yang-00

ccamp                                                         J. Ahlberg
Internet-Draft                                              S. Mansfield
Intended status: Standards Track                                Ericsson
Expires: 7 September 2023                                          M. Ye
                                                                 I. Busi
                                                     Huawei Technologies
                                                                   X. Li
                                                 NEC Laboratories Europe
                                                            D. Spreafico
                                                              Nokia - IT
                                                            6 March 2023

           A YANG Data Model for Interface Reference Topology
                  draft-ietf-ccamp-if-ref-topo-yang-00

Abstract

   This document defines a YANG data model to provide a reference from a
   termination point in a topology model to interface management
   information.

Discussion Venues

   This note is to be removed before publishing as an RFC.

   Source for this draft and an issue tracker can be found at
   https://github.com/ietf-ccamp-wg/draft-ietf-ccamp-mw-topo-yang.

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 7 September 2023.

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Copyright Notice

   Copyright (c) 2023 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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology and Definitions . . . . . . . . . . . . . . .   3
     1.2.  Tree Structure  . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Termination Point to Interface Reference YANG Data Model  . .   3
     3.1.  YANG Tree . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Termination Point to Interface Reference YANG Data
           Module  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  Examples of the Interface Reference Topology
           Model . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     A.1.  A tree for a complete Interface Reference Topology
           Model . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     A.2.  A JSON example  . . . . . . . . . . . . . . . . . . . . .   9
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   This document defines a YANG data model to provide a reference from a
   termination point in a topology model to interface management
   information.  It introduces a way to reference the information in a
   YANG data model for interface management [RFC8343] that could be
   useful for all types of termination points.  The model augments "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].

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   The interface reference model is expected to be used between a
   Provisioning Network Controller (PNC) and a Multi Domain Service
   Coordinator(MDSC) [RFC8453].  Different use cases require access to
   different attributes and in order not to restrict what use cases can
   be supported, all attributes supported by the interface management
   model is with this model made accessible from the topology model.

1.1.  Terminology and Definitions

   The following acronyms are used in this document:

   PNC Provisioning Network Controller

   MDSC Multi Domain Service Coordinator

1.2.  Tree Structure

   A simplified graphical representation of the data model is used in
   chapter 3.1 of this document.  The meaning of the symbols in these
   diagrams is defined in [RFC8340].

2.  Requirements Language

   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.  Termination Point to Interface Reference YANG Data Model

3.1.  YANG Tree

   module: ietf-tp-interface-reference-topology

   augment /nw:networks/nw:network/nw:node/nt:termination-point/tet:te:
     +--rw tp-to-interface-path?   -> /if:interfaces/interface/name

3.2.  Termination Point to Interface Reference YANG Data Module

   <CODE BEGINS> file "ietf-tp-interface-reference-topology.yang"
   module ietf-tp-interface-reference-topology {
     yang-version "1.1";
      namespace
     "urn:ietf:params:xml:ns:yang:ietf-tp-interface-reference-topology";

      prefix "ifref";

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      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-interfaces {
        prefix if;
        reference
          "RFC 8343";
      }

      organization
        "Internet Engineering Task Force (IETF) CCAMP WG";
      contact
        "WG List: <mailto:ccamp@ietf.org>

         Editor: Jonas Ahlberg
                 <mailto:jonas.ahlberg@ericsson.com>
         Editor: Scott Mansfield
                 <mailto:scott.mansfield@ericsson.com>
         Editor: Min Ye
                 <mailto:amy.yemin@huawei.com>
         Editor: Italo Busi
                 <mailto:Italo.Busi@huawei.com>
         Editor: Xi Li
                 <mailto:Xi.Li@neclab.eu>
         Editor: Daniela Spreafico

                 <mailto:daniela.spreafico@nokia.com>
        ";

      description
        "This is a module for defining a reference from a termination
         point in a te topology to a list element in interfaces
         as defined in RFC 8343.

        Copyright (c) 2023 IETF Trust and the persons

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        identified as authors of the code.  All rights reserved.

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

        This version of this YANG module is part of RFC XXXX
        (https://tools.ietf.org/html/rfcXXXX); see the RFC itself for
        full legal notices.";

      revision 2023-02-15 {
        description
        "First rough draft.";
        reference "";
      }

      /*
       * Groupings
       */
      grouping tp-to-interface-ref {

        description
          "Grouping used for reference between a termination point and
           an interface.";
        leaf tp-to-interface-path {
          type leafref {
            path '/if:interfaces/if:interface/if:name';
          }
          description
            "Leafref expression referencing a list element, identified
             by its name, in interfaces as defined in RFC 8343.";
        }
     }

      /*
       * Data nodes

       */

      augment "/nw:networks/nw:network/nw:node/nt:termination-point/"
              + "tet:te" {
        description
          "Augmentation to add possibility to reference an element
           in the list of interfaces as defined by RFC 8343.";
        uses tp-to-interface-ref;

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      }
    }
   <CODE ENDS>

4.  Security Considerations

   The YANG modules specified in this document define 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 is a data node defined in this YANG module that is
   writable/creatable/deletable (i.e., config true, which is the
   default).  This data node may be considered sensitive or vulnerable
   in some network environments.  Write operations (e.g., edit-config)
   to this data node without proper protection can have a negative
   effect on network operations.  This is the subtrees and data node and
   its sensitivity/vulnerability:

   *  tp-to-interface-path: A malicious client could set an arbitrary
      path that could allow a client to retrieve incorrect information.
      Troubleshooting would be difficult because the bad path would not
      be detectable until the client tries to use the leaf to identify
      to radio link terminal.

5.  IANA Considerations

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

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

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   It is proposed that IANA should record YANG module names in the "YANG
   Module Names" registry [RFC6020] as follows:

       Name: ietf-tp-interface-reference-topology
       Maintained by IANA?: N
       Namespace:
         urn:ietf:params:xml:ns:yang:ietf-interface-reference-topology
       Prefix: ifref
       Reference: RFC XXXX

6.  References

6.1.  Normative References

   [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/rfc/rfc2119>.

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

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

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

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

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

   [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/rfc/rfc8174>.

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

   [RFC8343]  Bjorklund, M., "A YANG Data Model for Interface
              Management", RFC 8343, DOI 10.17487/RFC8343, March 2018,
              <https://www.rfc-editor.org/rfc/rfc8343>.

   [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/rfc/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/rfc/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/rfc/rfc8795>.

6.2.  Informative References

   [RFC8340]  Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
              BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
              <https://www.rfc-editor.org/rfc/rfc8340>.

   [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/rfc/rfc8453>.

Appendix A.  Examples of the Interface Reference Topology Model

   This appendix provides some examples and illustrations of how the
   Interface Reference Topology Model can be used.  There is one
   extended tree to illustrate the Model and a JSON based instantiation
   of the Interface Reference Model for a small network example.

A.1.  A tree for a complete Interface Reference Topology Model

   The tree below shows the leafs for extending a Network Topology Model
   defined in [RFC8345], Traffic Engineering (TE) Topologies model
   defined in [RFC8795] with a possibility to reference interface
   management information.

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   module: ietf-network
     +--rw networks
        +--rw network* [network-id]
           +--rw network-id                network-id
           +--rw node* [node-id]
              +--rw node-id               node-id
              +--rw nt:termination-point* [tp-id]
                 +--rw nt:tp-id           tp-id
                 +--rw tet:te!
                    +--rw ifref:tp-to-interface-path?\
                      -> /if:interfaces/interface/name

A.2.  A JSON example

   {
     "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"
         }
       ]
     },
     "ietf-network:networks": {
       "network": [
         {
           "network-id": "L2-network",
           "network-types": {
             "ietf-te-topology:te-topology": {
               "ietf-eth-te-topology:eth-tran-topology": {}
             }
           },
           "node": [
             {
               "node-id": "L2-N1",
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "L2-N1-TP1",
                   "ietf-te-topology:te-tp-id": "10.10.10.1",
                   "ietf-te-topology:te": {
     "ietf-tp-interface-reference-topology:tp-to-interface-path":
        "L2Interface1"

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                   }
                 }
               ]
             },
             {
               "node-id": "L2-N2",
               "ietf-network-topology:termination-point": [
                 {
                   "tp-id": "L2-N2-TP2",
                   "ietf-te-topology:te-tp-id": "10.10.10.2",
                   "ietf-te-topology:te": {
     "ietf-tp-interface-reference-topology:tp-to-interface-path":
        "L2Interface2"
                   }
                 }
               ]
             }
           ],
           "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"
               }
             }
           ]
         }
       ]
     }
   }

Acknowledgments

   This document was prepared using kramdown

   The authors would like to thank ...

Authors' Addresses

   Jonas Ahlberg
   Ericsson
   Email: jonas.ahlberg@ericsson.com

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   Scott Mansfield
   Ericsson
   Email: scott.mansfield@ericsson.com

   Min Ye
   Huawei Technologies
   Email: amy.yemin@huawei.com

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

   Xi Li
   NEC Laboratories Europe
   Email: xi.li@neclab.eu

   Daniela Spreafico
   Nokia - IT
   Email: daniela.spreafico@nokia.com

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