TEAS Working Group V. P. Beeram Internet-Draft K. Kompella Intended status: Standards Track Juniper Networks Expires: 8 January 2026 7 July 2025 A YANG Data Model for Multipath Traffic Engineering Directed Acyclic Graph (MPTED) Tunnels and Junctions draft-beeram-teas-yang-mpted-00 Abstract This document defines a YANG data model for representing, retrieving, and manipulating Multipath Traffic Engineering Directed Acyclic Graph (MPTED) Tunnels and Junctions. The model includes two YANG modules, one for managing MPTED Tunnels on an MPTED tunnel originator node and the other for managing MPTED Junctions on an MPTED junction node. 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. 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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. Beeram & Kompella Expires 8 January 2026 [Page 1] Internet-Draft MPTED YANG Model July 2025 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3 1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3 1.3. Tree Diagram . . . . . . . . . . . . . . . . . . . . . . 3 2. MPTED YANG Module . . . . . . . . . . . . . . . . . . . . . . 3 2.1. Model Structure . . . . . . . . . . . . . . . . . . . . . 3 2.2. YANG Code . . . . . . . . . . . . . . . . . . . . . . . . 4 3. MPTED-JCT YANG Module . . . . . . . . . . . . . . . . . . . . 5 3.1. Model Structure . . . . . . . . . . . . . . . . . . . . . 5 3.2. YANG Code . . . . . . . . . . . . . . . . . . . . . . . . 5 4. Security Considerations . . . . . . . . . . . . . . . . . . . 6 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 6.1. Normative References . . . . . . . . . . . . . . . . . . 7 6.2. Informative References . . . . . . . . . . . . . . . . . 8 Appendix A. MPTED YANG Module - Complete Tree Structure . . . . 8 Appendix B. MPTED-JCT YANG Module - Complete Tree Structure . . 10 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 11 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12 1. Introduction The notions of a Multipath Traffic Engineering Directed Acyclic Graph (MPTED) tunnel and an MPTED junction are introduced in [I-D.draft-kompella-teas-mpte]. An MPTED tunnel is a Traffic Engineering (TE) construct that contains a constrained set of paths representing an optimized Directed Acyclic Graph (DAG) from one or more ingresses to one or more egresses. The paths that make up an MPTED tunnel traverse a set of junction nodes. An MPTED junction refers to the construct associated with the MPTED tunnel at each junction node and constitutes a set of previous-hops and a set of next-hops over which traffic is load-balanced in a weighted fashion. Provisioning an MPTED tunnel in a TE network involves provisioning MPTED junction state at each junction node. An MPTED tunnel is instantiated and managed on a tunnel originator node, while an MPTED junction is instantiated and managed on a junction node. A tunnel originator node MAY also be a junction node. This document defines a YANG data model for representing, retrieving, and manipulating Multipath Traffic Engineering Directed Acyclic Graph (MPTED) Tunnels and Junctions. The model includes two YANG modules, one for managing MPTED Tunnels on a tunnel originator node and the other for managing MPTED Junctions on a junction node. Beeram & Kompella Expires 8 January 2026 [Page 2] Internet-Draft MPTED YANG Model July 2025 The YANG modules discussed in this version of the document are scoped to MPLS MPTED tunnels and junctions with signaled label switching. The coverage for other types of MPTED tunnels and junctions will be added in later versions. 1.1. 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. 1.2. Terminology The terminology for describing YANG data models is found in [RFC7950]. The reader is expected to be familiar with the terminology used in [I-D.draft-kompella-teas-mpte]. 1.3. Tree Diagram A simplified graphical representation of the data model is used in Appendix A and Appendix B of this document. The meaning of the symbols in these diagrams is defined in [RFC8340]. 2. MPTED YANG Module 2.1. Model Structure The high-level model structure for MPTED tunnels defined by this document is as shown below: Beeram & Kompella Expires 8 January 2026 [Page 3] Internet-Draft MPTED YANG Model July 2025 module: ietf-mpted augment /te:te: +--rw mpted-tunnels +--rw tunnel* [originator identifier] +--rw originator inet:ip-address +--rw identifier uint32 + .. +--ro junctions +--ro junction* [node-id] +--ro node-id inet:ip-address + .. +--ro phops | +--ro phop* [hop-address hop-index] | +--ro hop-address inet:ip-address | +--ro hop-index uint32 | + .. +--ro nhops | +--ro nhop* [hop-address hop-index] | +--ro hop-address inet:ip-address | +--ro hop-index uint32 | + .. +--ro phops-pending-deletion | +--ro phop* [hop-address hop-index] | +--ro hop-address inet:ip-address | +--ro hop-index uint32 | + .. +--ro nhops-pending-deletion +--ro nhop* [hop-address hop-index] +--ro hop-address inet:ip-address +--ro hop-index uint32 + .. Figure 1: MPTED YANG Structure The top-level 'te' container is [I-D.draft-ietf-teas-yang-te] is augmented with a set of MPTED tunnels. The 'mpted-tunnels' container carries a list of tunnel entries. Each tunnel entry includes the set of parameters required to produce a list of junctions that need to programmed in the network. The state for each junction entry consists of the set of previous-hops ('phops' container) and next- hops ('nhops' container) associated with the current version, as well as those that are pending deletion ('phops-pending-deletion' and 'nhops-pending-deletion' containers). 2.2. YANG Code Beeram & Kompella Expires 8 January 2026 [Page 4] Internet-Draft MPTED YANG Model July 2025 file "ietf-mpted@2025-07-07.yang" (Artwork only available as YANG: see https://www.ietf.org/archive/id/draft-beeram-teas-yang-mpted-00.html) Figure 2: MPTED YANG module 3. MPTED-JCT YANG Module 3.1. Model Structure The high-level model structure for MPTED junctions defined by this document is as shown below: module: ietf-mpted-jct augment /te:te: +--rw mpted-junctions +--rw junction* [node-id originator identifier] +--rw node-id inet:ip-address +--rw originator inet:ip-address +--rw identifier uint32 + .. +--rw phops | +--rw phop* [hop-address hop-index] | +--rw hop-address inet:ip-address | +--rw hop-index uint32 | + .. +--rw nhops +--rw nhop* [hop-address hop-index] +--rw hop-address inet:ip-address +--rw hop-index uint32 + .. Figure 3: MPTED-JCT YANG Structure The top-level 'te' container is [I-D.draft-ietf-teas-yang-te] is augmented with a set of MPTED junctions. The 'mpted-junctions' container carries a list of junction entries. Each junction entry includes information about the associated set of previous-hops ('phops' container) and next-hops ('nhops' container). 3.2. YANG Code file "ietf-mpted-jct@2025-07-07.yang" (Artwork only available as YANG: see https://www.ietf.org/archive/id/draft-beeram-teas-yang-mpted-00.html) Beeram & Kompella Expires 8 January 2026 [Page 5] Internet-Draft MPTED YANG Model July 2025 Figure 4: MPTED JCT YANG module 4. Security Considerations The YANG module specified in this document defines a schema for data that is designed to be accessed via network management protocols such as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS [RFC8446]. The Network Configuration Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content. The data nodes defined in these YANG modules that are writable/creatable/deletable (i.e., config true, which is the default) may 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: "/te/mpted-tunnels": Unauthorized access to this list could influence how traffic is forwarded through the network. "/te/mpted-junctions": Unauthorized access to this list could influence how traffic is forwarded on a junction node. The readable data nodes in these YANG module may be considered sensitive or vulnerable in some network environments. It is thus important to control read access (e.g., via get, get-config, or notification) to these data nodes. These are the subtrees and data nodes and their sensitivity/vulnerability: "/te/mpted-tunnels/tunnel/junctions": Unauthorized read access to this list can disclose how traffic is load-balanced on each junction node. 5. IANA Considerations This document requests IANA to register the following URIs in the "ns" subregistry within the "IETF XML Registry" [RFC3688]. Beeram & Kompella Expires 8 January 2026 [Page 6] Internet-Draft MPTED YANG Model July 2025 URI: urn:ietf:params:xml:ns:yang:ietf-mpted Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-mpted-jct Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace. This document requests IANA to register the following YANG modules in the "YANG Module Names" subregistry [RFC6020] within the "YANG Parameters" registry. name: ietf-mpted namespace: urn:ietf:params:xml:ns:yang:ietf-mpted prefix: mpted reference: RFC XXXX name: ietf-mpted-jct namespace: urn:ietf:params:xml:ns:yang:ietf-mpted-jct prefix: mpted-jct reference: RFC XXXX RFC Editor: Please replace XXXX with the RFC number assigned to this document. 6. References 6.1. Normative References [I-D.draft-ietf-teas-yang-te] Saad, T., Gandhi, R., Liu, X., Beeram, V. P., and I. Bryskin, "A YANG Data Model for Traffic Engineering Tunnels, Label Switched Paths and Interfaces", Work in Progress, Internet-Draft, draft-ietf-teas-yang-te-38, 29 May 2025, . [I-D.draft-kompella-teas-mpte] Kompella, K., Jalil, L., Khaddam, M., and A. Smith, "Multipath Traffic Engineering", Work in Progress, Internet-Draft, draft-kompella-teas-mpte-01, 7 July 2025, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . Beeram & Kompella Expires 8 January 2026 [Page 7] Internet-Draft MPTED YANG Model July 2025 [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, . [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . [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, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . 6.2. Informative References [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . Appendix A. MPTED YANG Module - Complete Tree Structure Beeram & Kompella Expires 8 January 2026 [Page 8] Internet-Draft MPTED YANG Model July 2025 module: ietf-mpted augment /te:te: +--rw mpted-tunnels +--rw tunnel* [originator identifier] +--rw originator inet:ip-address +--rw identifier uint32 +--rw name? string +--rw ingress* inet:ip-address +--rw egress* inet:ip-address +--rw version? uint16 +--rw type? identityref +--rw setup-priority? uint8 +--rw hold-priority? uint8 +--rw optimization-metric? identityref +--rw resource-affinities | +--rw exclude-any* string | +--rw include-any* string | +--rw include-all* string +--rw bandwidth-specification-type? identityref +--rw set-bandwidth? uint64 +--rw auto-bandwidth | +--rw enabled? boolean | +--rw min-bw? uint64 | +--rw max-bw? uint64 | +--rw adjust-interval? uint32 | +--rw adjust-threshold? rt-types:percentage | +--rw overflow | | +--rw enabled? boolean | | +--rw overflow-threshold? rt-types:percentage | | +--rw trigger-event-count? uint16 | +--rw underflow | +--rw enabled? boolean | +--rw underflow-threshold? rt-types:percentage | +--rw trigger-event-count? uint16 +--rw mpted-computer? inet:ip-address +--rw signaling-type? identityref +--rw signaling-source? inet:ip-address +--ro status? identityref +--ro junctions +--ro junction* [node-id] +--ro node-id inet:ip-address +--ro version? uint16 +--ro bandwidth-requested? uint64 +--ro mtu? uint16 +--ro status? identityref +--ro phops | +--ro phop* [hop-address hop-index] Beeram & Kompella Expires 8 January 2026 [Page 9] Internet-Draft MPTED YANG Model July 2025 | +--ro hop-address inet:ip-address | +--ro hop-index uint32 | +--ro in-label? rt-types:mpls-label | +--ro status? identityref +--ro nhops | +--ro nhop* [hop-address hop-index] | +--ro hop-address inet:ip-address | +--ro hop-index uint32 | +--ro load-share? uint16 | +--ro bandwidth-reserved? uint64 | +--ro out-label? rt-types:mpls-label | +--ro status? identityref +--ro phops-pending-deletion | +--ro phop* [hop-address hop-index] | +--ro hop-address inet:ip-address | +--ro hop-index uint32 | +--ro version? uint16 +--ro nhops-pending-deletion +--ro nhop* [hop-address hop-index] +--ro hop-address inet:ip-address +--ro hop-index uint32 +--ro version? uint16 Figure 5: MPTED YANG tree Appendix B. MPTED-JCT YANG Module - Complete Tree Structure Beeram & Kompella Expires 8 January 2026 [Page 10] Internet-Draft MPTED YANG Model July 2025 module: ietf-mpted-jct augment /te:te: +--rw mpted-junctions +--rw junction* [node-id originator identifier] +--rw node-id inet:ip-address +--rw originator inet:ip-address +--rw identifier uint32 +--rw name? string +--rw ingress* inet:ip-address +--rw egress* inet:ip-address +--rw version? uint16 +--rw type? identityref +--rw setup-priority? uint8 +--rw hold-priority? uint8 +--rw bandwidth-requested? uint64 +--ro mtu? uint16 +--ro status? identityref +--rw phops | +--rw phop* [hop-address hop-index] | +--rw hop-address inet:ip-address | +--rw hop-index uint32 | +--ro in-label? rt-types:mpls-label | +--ro status? identityref +--rw nhops +--rw nhop* [hop-address hop-index] +--rw hop-address inet:ip-address +--rw hop-index uint32 +--rw load-share? uint16 +--ro bandwidth-reserved? uint64 +--ro out-label? rt-types:mpls-label +--ro status? identityref Figure 6: MPTED-JCT YANG tree Acknowledgments The authors would like to thank Sudharsana Venkatraman for her input from discussions. This document was prepared using kramdown. Contributors Chandrasekar Ramachandran Juniper Networks Email: csekar@juniper.net Beeram & Kompella Expires 8 January 2026 [Page 11] Internet-Draft MPTED YANG Model July 2025 Authors' Addresses Vishnu Pavan Beeram Juniper Networks Email: vbeeram@juniper.net Kireeti Kompella Juniper Networks Email: kireeti@juniper.net Beeram & Kompella Expires 8 January 2026 [Page 12]