CCAMP Working Group J. Ahlberg Internet-Draft Ericsson AB Intended status: Standards Track S. Mansfield Expires: 20 April 2024 Ericsson Inc M. Ye I. Busi Huawei Technologies X. Li NEC Laboratories Europe D. Spreafico Nokia - IT 18 October 2023 A YANG Data Model for Interface Reference Topology draft-ietf-ccamp-if-ref-topo-yang-01 Abstract This document defines a YANG data model to provide a reference from a termination point in a topology model to interface management information. About This Document This note is to be removed before publishing as an RFC. The latest revision of this draft can be found at https://github.com/ ietf-ccamp-wg/draft-ietf-ccamp-mw-topo-yang. Status information for this document may be found at https://datatracker.ietf.org/doc/draft- ietf-ccamp-if-ref-topo-yang/. Discussion of this document takes place on the CCAMP Working Group mailing list (mailto:ccamp@ietf.org), which is archived at https://datatracker.ietf.org/wg/ccamp/about/. Subscribe at https://www.ietf.org/mailman/listinfo/ccamp/. Source for this draft and an issue tracker can be found at https://github.com/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. Ahlberg, et al. Expires 20 April 2024 [Page 1] Internet-Draft Interface Reference Topology YANG Model October 2023 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 20 April 2024. 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 . . . . . . . . . . . . . . . . . . . . . . . . 3 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 . . . . . . . . . . . . . . . . . . . . . . . . . 4 4. Security Considerations . . . . . . . . . . . . . . . . . . . 6 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 6.1. Normative References . . . . . . . . . . . . . . . . . . 7 6.2. Informative References . . . . . . . . . . . . . . . . . 8 Appendix A. Examples of the Interface Reference Topology Model . . . . . . . . . . . . . . . . . . . . . . . . . . 9 A.1. A tree for a complete Interface Reference Topology Model . . . . . . . . . . . . . . . . . . . . . . . . . . 9 A.2. A JSON example . . . . . . . . . . . . . . . . . . . . . 9 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 11 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11 Ahlberg, et al. Expires 20 April 2024 [Page 2] Internet-Draft Interface Reference Topology YANG Model October 2023 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]. 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 Ahlberg, et al. Expires 20 April 2024 [Page 3] Internet-Draft Interface Reference Topology YANG Model October 2023 3.2. Termination Point to Interface Reference YANG Data Module 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"; 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: Editor: Jonas Ahlberg Editor: Scott Mansfield Editor: Min Ye Editor: Italo Busi Editor: Xi Li Editor: Daniela Spreafico Ahlberg, et al. Expires 20 April 2024 [Page 4] Internet-Draft Interface Reference Topology YANG Model October 2023 "; 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 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 Ahlberg, et al. Expires 20 April 2024 [Page 5] Internet-Draft Interface Reference Topology YANG Model October 2023 */ 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; } } 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. Ahlberg, et al. Expires 20 April 2024 [Page 6] Internet-Draft Interface Reference Topology YANG Model October 2023 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. 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, . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [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, . [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, . Ahlberg, et al. Expires 20 April 2024 [Page 7] Internet-Draft Interface Reference Topology YANG Model October 2023 [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, . [RFC8343] Bjorklund, M., "A YANG Data Model for Interface Management", RFC 8343, DOI 10.17487/RFC8343, March 2018, . [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, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . [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, . 6.2. Informative References [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . [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, . Ahlberg, et al. Expires 20 April 2024 [Page 8] Internet-Draft Interface Reference Topology YANG Model October 2023 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. 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": { Ahlberg, et al. Expires 20 April 2024 [Page 9] Internet-Draft Interface Reference Topology YANG Model October 2023 "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" } } ] }, { "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" } } ] } ] } Ahlberg, et al. Expires 20 April 2024 [Page 10] Internet-Draft Interface Reference Topology YANG Model October 2023 } Acknowledgments This document was prepared using kramdown The authors would like to thank ... Authors' Addresses Jonas Ahlberg Ericsson AB Lindholmspiren 11 SE-417 56 Goteborg Sweden Email: jonas.ahlberg@ericsson.com Scott Mansfield Ericsson Inc Email: scott.mansfield@ericsson.com Min Ye Huawei Technologies No.1899, Xiyuan Avenue Chengdu 611731 China Email: amy.yemin@huawei.com Italo Busi Huawei Technologies Email: italo.busi@huawei.com Xi Li NEC Laboratories Europe Kurfursten-Anlage 36 69115 Heidelberg Germany Email: Xi.Li@neclab.eu Ahlberg, et al. Expires 20 April 2024 [Page 11] Internet-Draft Interface Reference Topology YANG Model October 2023 Daniela Spreafico Nokia - IT Via Energy Park, 14 20871 Vimercate (MI) Italy Email: daniela.spreafico@nokia.com Ahlberg, et al. Expires 20 April 2024 [Page 12]