TEAS Working Group Italo Busi Internet Draft Haomian Zheng Intended status: Standard Track Huawei Aihua Guo Futurewei Xufeng Liu Volta Networks Expires: January 2021 July 13, 2020 A YANG Data Model for MPLS-TE Topology draft-busizheng-teas-yang-te-mpls-topology-00 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), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on January 13, 2021. Copyright Notice Copyright (c) 2020 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents Busi & Zheng Expires January 13, 2021 [Page 1] Internet-Draft MPLS-TE Topology YANG Model July 2020 (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Abstract This document describes a YANG data model for Multi-Protocol Label Switching (MPLS) with Traffic Engineering (MPLS-TE) networks. Table of Contents 1. Introduction...................................................2 1.1. Tree Diagram..............................................3 1.2. Prefixes in Data Node Names...............................3 2. MPLS-TE Types Overview.........................................3 3. MPLS-TE Topology Model Overview................................4 3.1. TE Label Augmentations....................................6 3.2. MPLS-TP Topology..........................................6 4. YANG model for common MPLS-TE Types............................7 5. YANG model for MPLS-TE Topology...............................12 5.1. YANG Tree................................................12 5.2. YANG Code................................................16 6. Security Considerations.......................................27 7. IANA Considerations...........................................27 8. References....................................................27 8.1. Normative References.....................................27 8.2. Informative References...................................28 Acknowledgments..................................................28 Authors' Addresses...............................................29 1. Introduction This document describes a YANG data model for Multi-Protocol Label Switching (MPLS) with Traffic Engineering (MPLS-TE) networks. This document also defines a collection of common data types and groupings in YANG data modeling language for MPLS-TE networks. These derived common types and groupings are intended to be imported by the MPLS-TE topology model, defined in this document, as well as by the MPLS-TE tunnel model, defined in [TE-MPLS]. Busi & Zheng Expires January 13, 2021 [Page 2] Internet-Draft MPLS-TE Topology YANG Model July 2020 Multi-Protocol Label Switching - Transport Profile (MPLS-TP) is a profile of the MPLS protocol that is used in packet switched transport networks and operated in a similar manner to other existing transport technologies (e.g., OTN), as described in RFC5921. The YANG model defined in this document can also be for MPLS-TP networks. 1.1. Tree Diagram A simplified graphical representation of the data model is used in section 5.1 of this this document. The meaning of the symbols in these diagrams is defined in [RFC8340]. 1.2. 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 | +---------------+-------------------------+-----------------------+ | rt-types | ietf-routing-types | [RFC8294] | | tet | ietf-te-topology | [TE-Topology] | | tet-pkt | ietf-te-topology-packet | [L3-TE-Topology] | | mte-types | ietf-mpls-te-types | This document | | tet-mpls | ietf-te-mpls-topology | This document | +---------------+-------------------------+-----------------------+ Table 1: Prefixes and corresponding YANG modules 2. MPLS-TE Types Overview The module ietf-mpls-te-types contains the following YANG reusable types and groupings: bandwidth-profile-type: This identity defines various bandwidth profiles specified by IETF and other organizations that may be used to limit bandwidth utilization of MPLS-TE LSPs. load-balancing-type This identify defines the types of load-balancing algorithms used on bundled MPLS-TE link. Busi & Zheng Expires January 13, 2021 [Page 3] Internet-Draft MPLS-TE Topology YANG Model July 2020 te-packet-path-bandwidth This grouping defines the path bandwidth information and could be used in MPLS-TE topology model for the representation of MPLS-TE LSP bandwidth. All the path and LSP bandwidth related sections in generic module, [RFC8776], need to be augmented with this grouping for the usage of MPLS-TE. This grouping is also applicable to set up the MPLS-TE tunnel. te-packet-link-bandwidth This grouping defines the link bandwidth information and could be used in MPLS-TE topology model for link bandwidth representation. All the link bandwidth related sections in generic module, [RFC8776], need to be augmented with this grouping for the usage of MPLS_TE. te-mpls-label-hop This grouping is used for the augmentation of TE label for MPLS_TE path. 3. MPLS-TE Topology Model Overview The MPLS-TE technology specific topology model augments the ietf-te- topology-packet YANG module, defined in [L3-TE-Topology], which in turns augment the generic ietf-te-topology YANG module, defined in [TE-Topology]. Busi & Zheng Expires January 13, 2021 [Page 4] Internet-Draft MPLS-TE Topology YANG Model July 2020 +------------------+ o: augment TE generic | ietf-te-topology | +------------------+ o | | | +-------------------------+ Packet TE | ietf-te-topology-packet | +-------------------------+ o | | | +-----------------------+ MPLS-TE | ietf-te-mpls-topology | +-----------------------+ Figure 1 - Relationship between MPLS-TE, Packet-TE and TE topology models Given the guidance for augmentation in [TE-Topology], the following technology-specific augmentations need to be provided: - A network-type to indicate that the TE topology is an MPLS-TE Topology, as follow: augment /nw:networks/nw:network/nw:network-types/tet:te-topology /tet-pkt:packet: +--rw mpls-topology! - TE Bandwidth Augmentations for paths and LSPs: +--:(packet) +--rw bandwidth-profile-name? string +--rw bandwidth-profile-type? identityref +--rw CIR? uint64 +--rw EIR? uint64 +--rw CBS? uint64 +--rw EBS? uint64 - TE Bandwidth Augmentations for links: +--:(packet) +--rw packet-bandwidth? bandwidth-kbps Busi & Zheng Expires January 13, 2021 [Page 5] Internet-Draft MPLS-TE Topology YANG Model July 2020 - TE Label Augmentations as described in section 3.2; 3.1. TE Label Augmentations In MPLS-TE, the label allocation is done by NE, information about label values availability is not necessary to be provided to the controller. Moreover, MPLS-TE tunnels are currently established within a single domain. Therefore this document does not define any MPLS-TE technology-specific augmentations, of the TE Topology model, for the TE label since no TE label related attributes should be instantiated for MPLS-TE Topologies. Open issue: shall this module allows the setup of MPLS-TE multi-domain tunnels? 3.2. MPLS-TP Topology Multi-Protocol Label Switching - Transport Profile (MPLS-TP) is a profile of the MPLS protocol that is used in packet switched transport networks and operated in a similar manner to other existing transport technologies (e.g., OTN), as described in [RFC5921]. Therefore YANG model defined in this document can also be applicable for MPLS-TP networks. However, as described in [RFC5921], MPLS-TP networks support bidirectional LSPs and require no ECMP and no PHP. When reporting the topology for an MPLS-TP network, additional information is required to indicate whether the network support these MPLS-TP characteristics. It is worth noting that [TE-Topology] is already capable to model TE topologies supporting either unidirectional or bidirectional LSPs: all bidirectional TE links can support bidirectional LSPs and all the links can support unidirectional LSPs and it is always possible to associated unidirectional LSPs as long as they belong to the same tunnel. When setting up bidirectional LSPs (e.g., MPLS-TP LSPs) only bidirectional TE Links are selected by path computation. In order to allow reporting that ECMP is not affecting forwarding the packets of a given LSP, the load-balancing-type attribute reports Busi & Zheng Expires January 13, 2021 [Page 6] Internet-Draft MPLS-TE Topology YANG Model July 2020 whether a LAG or TE Bundled Link performs load-balancing on a per-flow or per-top-label: augment /nw:networks/nw:network/nt:link/tet:te: +--rw load-balancing-type? mte-types:load-balancing-type When setting up LSPs which do not requires ECMP (e.g., MPLS-TP LSPs) only Links that are not part of a LAG or TE Bundle or that performs per-top-label load balancing are selected by path computation. It is assumed that almost all the MPLS-TE nodes are capable to support Ultimate Hop Popping (UHP). However, if some interfaces are not able to support UHP, they can report it in the MPLS-TE topology: augment /nw:networks/nw:network/nw:node/nt:termination-point /tet:te: +--ro uhp-incapable? empty When setting up LSPs which do not requires PHP (e.g., MPLS-TP LSPs) only the interfaces (LTPs) which are capable to support UHP in the destination node are selected by path computation. 4. YANG model for common MPLS-TE Types file "ietf-mpls-te-types@2020-07-13.yang" module ietf-mpls-te-types { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-mpls-te-types"; prefix "mte-types"; import ietf-routing-types { prefix "rt-types"; } import ietf-te-packet-types { prefix "te-packet-types"; reference "RFC 8776: Common YANG Data Types for Traffic Engineering"; } organization "Internet Engineering Task Force (IETF) TEAS WG"; Busi & Zheng Expires January 13, 2021 [Page 7] Internet-Draft MPLS-TE Topology YANG Model July 2020 contact "WG Web: WG List: Editor: Italo Busi Editor: Haomian Zheng Editor: Aihua Guo Editor: Xufeng Liu "; description "This module defines technology-specific MPLS-TE types data model. Copyright (c) 2020 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2020-07-13 { description "Initial Version"; reference "draft-busizheng-teas-yang-te-mpls-topology"; } /* Busi & Zheng Expires January 13, 2021 [Page 8] Internet-Draft MPLS-TE Topology YANG Model July 2020 * Identities (to be moved to te-packet-types?) */ identity bandwidth-profile-type { description "Bandwidth Profile Types"; } identity mef-10-bwp { base bandwidth-profile-type; description "MEF 10 Bandwidth Profile"; } identity rfc-2697-bwp { base bandwidth-profile-type; description "RFC 2697 Bandwidth Profile"; } identity rfc-2698-bwp { base bandwidth-profile-type; description "RFC 2698 Bandwidth Profile"; } identity rfc-4115-bwp { base bandwidth-profile-type; description "RFC 4115 Bandwidth Profile"; } /* * Type Definitions (MPLS-TE) */ typedef load-balancing-type { type enumeration { enum per-flow { description "The load-balancing algorithm ensures that packets Busi & Zheng Expires January 13, 2021 [Page 9] Internet-Draft MPLS-TE Topology YANG Model July 2020 characterized as the same flow (e.g. based on IP 5-tuple) that egress on a LAG or a bundled TE link are forwarded on the same component link. Packets for different flows within the same LSP can be forwarded on different component links."; } enum per-top-label { description "The load-balancing algorithm ensures incoming MPLS packets with the same top MPLS label and that egress on a on a LAG or bundled TE link are forwarded on the same component link. Packets for different flows within the same LSP are forwarded on the same component link."; } } description "The type of load balancing used on bundled links."; } // typedef load-balancing-type /* * Groupings (to be moved to te-packet-types?) */ grouping te-packet-path-bandwidth { description "Path bandwidth for Packet. "; leaf bandwidth-profile-name{ type string; description "Name of Bandwidth Profile."; } leaf bandwidth-profile-type { type identityref { base bandwidth-profile-type; } description "Type of Bandwidth Profile."; } Busi & Zheng Expires January 13, 2021 [Page 10] Internet-Draft MPLS-TE Topology YANG Model July 2020 leaf CIR { type uint64; description "Committed Information Rate in Kbps"; } leaf EIR { type uint64; /* Need to indicate that EIR is not supported by RFC 2697 must '../bw-profile-type = "etht-types:mef-10-bwp" or ' + '../bw-profile-type = "etht-types:rfc-2698-bwp" or ' + '../bw-profile-type = "etht-types:rfc-4115-bwp"' must '../bw-profile-type != "etht-types:rfc-2697-bwp"' */ description "Excess Information Rate in Kbps In case of RFC 2698, PIR = CIR + EIR"; } leaf CBS { type uint64; description "Committed Burst Size in in KBytes"; } leaf EBS { type uint64; description "Excess Burst Size in KBytes. In case of RFC 2698, PBS = CBS + EBS"; } } grouping te-packet-link-bandwidth { description Busi & Zheng Expires January 13, 2021 [Page 11] Internet-Draft MPLS-TE Topology YANG Model July 2020 "Link Bandwidth for Packet. "; leaf packet-bandwidth { type te-packet-types:bandwidth-kbps; description "Available bandwith value expressed in kilobits per second"; } } /* * Groupings (MPLS-TE) */ grouping te-mpls-label-hop { description "MPLS-TE Label Hop."; leaf mpls-label { type rt-types:mpls-label; description "MPLS Label."; } } // grouping te-mpls-label-hop } Figure 2 - MPLS-TE types YANG module 5. YANG model for MPLS-TE Topology 5.1. YANG Tree Figure 3 below shows the tree diagram of the YANG model defined in module ietf-te-mpls-topology.yang. module: ietf-te-mpls-topology augment /nw:networks/nw:network/nw:node/nt:termination-point/tet:te /tet:interface-switching-capability/tet:max-lsp-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--rw bandwidth-profile-name? string Busi & Zheng Expires January 13, 2021 [Page 12] Internet-Draft MPLS-TE Topology YANG Model July 2020 +--rw bandwidth-profile-type? identityref +--rw CIR? uint64 +--rw EIR? uint64 +--rw CBS? uint64 +--rw EBS? uint64 augment /nw:networks/nw:network/nw:node/tet:te /tet:te-node-attributes/tet:connectivity-matrices /tet:path-constraints/tet:te-bandwidth/tet:technology: +--:(packet) +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nw:node/tet:te /tet:te-node-attributes/tet:connectivity-matrices /tet:connectivity-matrix/tet:path-constraints /tet:te-bandwidth/tet:technology: +--:(packet) +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nw:node/tet:te /tet:information-source-entry/tet:connectivity-matrices /tet:path-constraints/tet:te-bandwidth/tet:technology: +--:(packet) +--ro packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nw:node/tet:te /tet:information-source-entry/tet:connectivity-matrices /tet:connectivity-matrix/tet:path-constraints /tet:te-bandwidth/tet:technology: +--:(packet) +--ro packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nw:node/tet:te /tet:tunnel-termination-point/tet:client-layer-adaptation /tet:switching-capability/tet:te-bandwidth /tet:technology: +--:(packet) +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nw:node/tet:te /tet:tunnel-termination-point /tet:local-link-connectivities/tet:path-constraints /tet:te-bandwidth/tet:technology: +--:(packet) +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nw:node/tet:te /tet:tunnel-termination-point Busi & Zheng Expires January 13, 2021 [Page 13] Internet-Draft MPLS-TE Topology YANG Model July 2020 /tet:local-link-connectivities /tet:local-link-connectivity/tet:path-constraints /tet:te-bandwidth/tet:technology: +--:(packet) +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nt:link/tet:te /tet:te-link-attributes /tet:interface-switching-capability/tet:max-lsp-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--rw bandwidth-profile-name? string +--rw bandwidth-profile-type? identityref +--rw CIR? uint64 +--rw EIR? uint64 +--rw CBS? uint64 +--rw EBS? uint64 augment /nw:networks/nw:network/nt:link/tet:te /tet:te-link-attributes/tet:max-link-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nt:link/tet:te /tet:te-link-attributes/tet:max-resv-link-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nt:link/tet:te /tet:te-link-attributes/tet:unreserved-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nt:link/tet:te /tet:information-source-entry /tet:interface-switching-capability/tet:max-lsp-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--ro bandwidth-profile-name? string +--ro bandwidth-profile-type? identityref +--ro CIR? uint64 +--ro EIR? uint64 +--ro CBS? uint64 Busi & Zheng Expires January 13, 2021 [Page 14] Internet-Draft MPLS-TE Topology YANG Model July 2020 +--ro EBS? uint64 augment /nw:networks/nw:network/nt:link/tet:te /tet:information-source-entry/tet:max-link-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--ro packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nt:link/tet:te /tet:information-source-entry/tet:max-resv-link-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--ro packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nt:link/tet:te /tet:information-source-entry/tet:unreserved-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--ro packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/tet:te/tet:templates/tet:link-template /tet:te-link-attributes /tet:interface-switching-capability/tet:max-lsp-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--rw bandwidth-profile-name? string +--rw bandwidth-profile-type? identityref +--rw CIR? uint64 +--rw EIR? uint64 +--rw CBS? uint64 +--rw EBS? uint64 augment /nw:networks/tet:te/tet:templates/tet:link-template /tet:te-link-attributes/tet:max-link-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/tet:te/tet:templates/tet:link-template /tet:te-link-attributes/tet:max-resv-link-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/tet:te/tet:templates/tet:link-template /tet:te-link-attributes/tet:unreserved-bandwidth /tet:te-bandwidth/tet:technology: +--:(packet) Busi & Zheng Expires January 13, 2021 [Page 15] Internet-Draft MPLS-TE Topology YANG Model July 2020 +--rw packet-bandwidth? te-packet-types:bandwidth-kbps augment /nw:networks/nw:network/nw:network-types/tet:te-topology /tet-pkt:packet: +--rw mpls-topology! augment /nw:networks/nw:network/nt:link/tet:te: +--rw load-balancing-type? mte-types:load-balancing-type augment /nw:networks/nw:network/nw:node/nt:termination-point /tet:te: +--ro uhp-incapable? empty Figure 3 - MPLS-TE topology YANG tree 5.2. YANG Code file "ietf-te-mpls-topology@2020-07-13.yang" module ietf-te-mpls-topology { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-te-mpls-topology"; prefix "tet-mpls"; import ietf-network { prefix "nw"; } import ietf-network-topology { prefix "nt"; } import ietf-te-topology { prefix "tet"; } import ietf-te-topology-packet { prefix "tet-pkt"; } import ietf-mpls-te-types { prefix "mte-types"; } Busi & Zheng Expires January 13, 2021 [Page 16] Internet-Draft MPLS-TE Topology YANG Model July 2020 organization "Internet Engineering Task Force (IETF) TEAS WG"; contact "WG Web: WG List: Editor: Italo Busi Editor: Haomian Zheng Editor: Aihua Guo Editor: Xufeng Liu "; description "This module defines technology-specific MPLS-TE topology data model. Copyright (c) 2020 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2020-07-13 { description "Initial Version"; reference "draft-busizheng-teas-yang-te-mpls-topology"; } Busi & Zheng Expires January 13, 2021 [Page 17] Internet-Draft MPLS-TE Topology YANG Model July 2020 /* * Augment TE bandwidth (to be moved to te-topology-packet?) */ augment "/nw:networks/nw:network/nw:node/nt:termination-point/" + "tet:te/" + "tet:interface-switching-capability/tet:max-lsp-bandwidth/" + "tet:te-bandwidth/tet:technology" { when "../../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment maximum LSP TE bandwidth for the link termination point (LTP)."; case packet { uses mte-types:te-packet-path-bandwidth; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:path-constraints/tet:te-bandwidth/tet:technology" { when "../../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment TE bandwidth path constraints of the TE node connectivity matrices."; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nw:node/tet:te/" Busi & Zheng Expires January 13, 2021 [Page 18] Internet-Draft MPLS-TE Topology YANG Model July 2020 + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:path-constraints/tet:te-bandwidth/tet:technology" { when "../../../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment TE bandwidth path constraints of the connectivity matrix entry."; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:path-constraints/tet:te-bandwidth/tet:technology" { when "../../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment TE bandwidth path constraints of the TE node connectivity matrices information source."; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:path-constraints/tet:te-bandwidth/tet:technology" { when "../../../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description Busi & Zheng Expires January 13, 2021 [Page 19] Internet-Draft MPLS-TE Topology YANG Model July 2020 "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment TE bandwidth path constraints of the connectivity matrix entry information source"; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:client-layer-adaptation/tet:switching-capability/" + "tet:te-bandwidth/tet:technology" { when "../../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment client TE bandwidth of the tunnel termination point (TTP)"; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/tet:path-constraints/" + "tet:te-bandwidth/tet:technology" { when "../../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment TE bandwidth path constraints for the TTP Busi & Zheng Expires January 13, 2021 [Page 20] Internet-Draft MPLS-TE Topology YANG Model July 2020 Local Link Connectivities."; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:local-link-connectivity/tet:path-constraints/" + "tet:te-bandwidth/tet:technology" { when "../../../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment TE bandwidth path constraints for the TTP Local Link Connectivity entry."; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:interface-switching-capability/tet:max-lsp-bandwidth/" + "tet:te-bandwidth/tet:technology" { when "../../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment maximum LSP TE bandwidth for the TE link."; case packet { uses mte-types:te-packet-path-bandwidth; } } Busi & Zheng Expires January 13, 2021 [Page 21] Internet-Draft MPLS-TE Topology YANG Model July 2020 augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:max-link-bandwidth/" + "tet:te-bandwidth/tet:technology" { when "../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment maximum TE bandwidth for the TE link"; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:max-resv-link-bandwidth/" + "tet:te-bandwidth/tet:technology" { when "../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment maximum reservable TE bandwidth for the TE link"; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:unreserved-bandwidth/" + "tet:te-bandwidth/tet:technology" { when "../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { Busi & Zheng Expires January 13, 2021 [Page 22] Internet-Draft MPLS-TE Topology YANG Model July 2020 description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment unreserved TE bandwidth for the TE Link"; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:information-source-entry/" + "tet:interface-switching-capability/" + "tet:max-lsp-bandwidth/" + "tet:te-bandwidth/tet:technology" { when "../../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment maximum LSP TE bandwidth for the TE link information source"; case packet { uses mte-types:te-packet-path-bandwidth; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:information-source-entry/" + "tet:max-link-bandwidth/" + "tet:te-bandwidth/tet:technology" { when "../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description Busi & Zheng Expires January 13, 2021 [Page 23] Internet-Draft MPLS-TE Topology YANG Model July 2020 "Augment maximum TE bandwidth for the TE link information source"; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:information-source-entry/" + "tet:max-resv-link-bandwidth/" + "tet:te-bandwidth/tet:technology" { when "../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment maximum reservable TE bandwidth for the TE link information-source"; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:information-source-entry/" + "tet:unreserved-bandwidth/" + "tet:te-bandwidth/tet:technology" { when "../../../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet" { description "Augmentation parameters apply only for networks with Packet TE topology type."; } description "Augment unreserved TE bandwidth of the TE link information source"; case packet { uses mte-types:te-packet-link-bandwidth; } Busi & Zheng Expires January 13, 2021 [Page 24] Internet-Draft MPLS-TE Topology YANG Model July 2020 } augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:interface-switching-capability/" + "tet:max-lsp-bandwidth/" + "tet:te-bandwidth/tet:technology" { description "Augment maximum LSP TE bandwidth of the TE link template"; case packet { uses mte-types:te-packet-path-bandwidth; } } augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:max-link-bandwidth/" + "tet:te-bandwidth/tet:technology" { description "Augment maximum TE bandwidth the TE link template"; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:max-resv-link-bandwidth/" + "tet:te-bandwidth/tet:technology" { description "Augment maximum reservable TE bandwidth for the TE link template."; case packet { uses mte-types:te-packet-link-bandwidth; } } augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:unreserved-bandwidth/" Busi & Zheng Expires January 13, 2021 [Page 25] Internet-Draft MPLS-TE Topology YANG Model July 2020 + "tet:te-bandwidth/tet:technology" { description "Augment unreserved TE bandwidth the TE link template"; case packet { uses mte-types:te-packet-link-bandwidth; } } /* * Augmentations */ augment "/nw:networks/nw:network/nw:network-types/" + "tet:te-topology/tet-pkt:packet" { description "Augment network types to include MPLS-TE Topology Type"; container mpls-topology { presence "Indicates an MPLS-TE Topology Type."; description "Its presence indicates an MPLS-TE Topology"; } } augment "/nw:networks/nw:network/nt:link/tet:te" { when "../../nw:network-types/tet:te-topology/" + "tet-pkt:packet/tet-mpls:mpls-topology" { description "Augment MPLS-TE Topology."; } description "Augment TE Link."; leaf load-balancing-type { type mte-types:load-balancing-type; default 'per-flow'; description "Indicates the type of load-balancing (per-flow or per-LSP) performed by the bundled TE Link. This leaf is not present when the TE Link is not bundled."; Busi & Zheng Expires January 13, 2021 [Page 26] Internet-Draft MPLS-TE Topology YANG Model July 2020 } // leaf load-balancing-type } augment "/nw:networks/nw:network/nw:node/nt:termination-point/" + "tet:te" { when "../../../nw:network-types/tet:te-topology/" + "tet-pkt:packet/tet-mpls:mpls-topology" { description "Augment MPLS-TE Topology."; } description "Augment LTP."; leaf uhp-incapable { type empty; config false; description "When present, indicates that the LTP is not capable to support Ultimate Hop Popping (UHP)."; } // leaf uhp-incapable } } Figure 4 - MPLS-TE topology YANG module 6. Security Considerations To be added 7. IANA Considerations To be added 8. References 8.1. Normative References [RFC6991] J. Schoenwaelder, "Common YANG Data Types", RFC6991. [RFC8294] X. Liu, et. al., "Common YANG Data Types for the Routing Area", RFC8294. [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, March 2018. Busi & Zheng Expires January 13, 2021 [Page 27] Internet-Draft MPLS-TE Topology YANG Model July 2020 [RFC8776] Saad, T., Gandhi, R., Liu, X., Beeram, V., and I. Bryskin, "Common YANG Data Types for Traffic Engineering", RFC8776, June 2020. [TE-Topology] X. Liu, et. al., "YANG Data Model for TE Topologies", draft-ietf-teas-yang-te-topo, work in progress. [L3-TE-Topology] X. Liu, et. al., "YANG Data Model for Layer 3 TE Topologies", draft-ietf-teas-yang-l3-te-topo, work in progress. 8.2. Informative References [RFC5921] M. Bocci, et., al., "A Framework for MPLS in Transport Networks", RFC5921. [TE-MPLS] T. Saad, et. al., "A YANG Data Model for MPLS Traffic Engineering Tunnels", draft-ietf-teas-yang-te-mpls, work in progress. Acknowledgments The authors would also like to thank Tarek Saad, Vishnu Pavan Beeram, Rakesh Gandhi, Xufeng Liu, Igor Bryskin for their input on how to support MPLS-TP features (bidirectional LSPs, no ECMP, no PHP) using a common MPLS-TE topology model. We thank Loa Andersson and Igor Bryskin for providing useful suggestions for this draft. This document was prepared using 2-Word-v2.0.template.dot. Busi & Zheng Expires January 13, 2021 [Page 28] Internet-Draft MPLS-TE Topology YANG Model July 2020 Authors' Addresses Italo Busi Huawei Technologies Email: italo.busi@huawei.com Haomian Zheng Huawei Technologies Email: zhenghaomian@huawei.com Aihua Guo Futurewei Inc. Email: aihuaguo.ietf@gmail.com Xufeng Liu Volta Networks Email: xufeng.liu.ietf@gmail.com Busi & Zheng Expires January 13, 2021 [Page 29]