CCAMP Working Group I. Busi Internet-Draft Huawei Technologies Intended status: Standards Track A. Guo Expires: 23 October 2023 Futurewei Technologies S. Belotti Nokia 21 April 2023 A YANG Data Model for requesting Path Computation in an Optical Transport Network (OTN) draft-ietf-ccamp-otn-path-computation-yang-01 Abstract This document provides a mechanism to request path computation in an Optical Transport Network (OTN) by augmenting the Remote Procedure Calls (RPCs) defined in RFC YYYY. [RFC EDITOR NOTE: Please replace RFC YYYY with the RFC number of draft-ietf-teas-yang-path-computation once it has been published. 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 23 October 2023. 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 Busi, et al. Expires 23 October 2023 [Page 1] Internet-Draft YANG for OTN Path Computation April 2023 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 Notations . . . . . . . . . . . . . . . . 3 1.2. Tree Diagram . . . . . . . . . . . . . . . . . . . . . . 3 1.3. Prefix in Data Node Names . . . . . . . . . . . . . . . . 3 2. YANG Data Model for OTN Path Computation . . . . . . . . . . 4 2.1. YANG Model Overview . . . . . . . . . . . . . . . . . . . 4 2.2. Bandwidth Augmentation . . . . . . . . . . . . . . . . . 5 2.3. Label Augmentations . . . . . . . . . . . . . . . . . . . 5 3. OTN Path Computation Tree Diagram . . . . . . . . . . . . . . 5 4. YANG Model for OTN Path Computation . . . . . . . . . . . . . 10 5. Manageability Considerations . . . . . . . . . . . . . . . . 16 6. Security Considerations . . . . . . . . . . . . . . . . . . . 16 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 17 8.1. Normative References . . . . . . . . . . . . . . . . . . 17 8.2. Informative References . . . . . . . . . . . . . . . . . 18 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 19 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 19 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 19 1. Introduction [I-D.ietf-teas-yang-path-computation] describes key use cases, where a client needs to request underlying SDN controllers for path computation. In some of these use cases, the underlying SDN controller can control an Optical Transport Network (OTN). This document defines a YANG data model, which augment the generic Path Computation RPC defined in [I-D.ietf-teas-yang-path-computation], with OTN technology-specific augmentations required to request path computation to an underlying OTN SDN controller. These models allow a client to delegate path computation tasks to the underlying SDN controller without having to obtain OTN detailed information from the controller and performing feasible path computation itself. Busi, et al. Expires 23 October 2023 [Page 2] Internet-Draft YANG for OTN Path Computation April 2023 1.1. Terminology and Notations Refer to [I-D.ietf-ccamp-otn-topo-yang] and [I-D.ietf-ccamp-layer1-types] for the OTN specific terms used in this document. The following terms are defined in [RFC7950] and are not redefined here: * client * server * augment * data model * data node The following terms are defined in [RFC6241] and are not redefined here: * configuration data * state data The terminology for describing YANG data models is found in [RFC7950]. 1.2. Tree Diagram A simplified graphical representation of the data model is used in Section 3 of this document. The meaning of the symbols in these diagrams is defined in [RFC8340]. 1.3. Prefix 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. Busi, et al. Expires 23 October 2023 [Page 3] Internet-Draft YANG for OTN Path Computation April 2023 +==========+===========================+===========+ | Prefix | YANG module | Reference | +==========+===========================+===========+ | l1-types | ietf-layer1-types | [RFCZZZZ] | +----------+---------------------------+-----------+ | te | ietf-te | [RFCKKKK] | +----------+---------------------------+-----------+ | te-pc | ietf-te-path-computation | [RFCYYYY] | +----------+---------------------------+-----------+ | otn-pc | ietf-otn-path-computation | RFCXXXX | +----------+---------------------------+-----------+ Table 1: Prefixes and corresponding YANG modules RFC Editor Note: Please replace XXXX with the RFC number assigned to this document. Please replace YYYY with the RFC number assigned to [I-D.ietf-teas-yang-path-computation]. Please replace ZZZZ with the RFC number assigned to [I-D.ietf-ccamp-layer1-types]. Please replace KKKK with the RFC number assigned to [I-D.ietf-teas-yang-te]. Please remove this note. 2. YANG Data Model for OTN Path Computation 2.1. YANG Model Overview The YANG data model for requesting OTN path computation is defined as an augmentation of the generic Path Computation RPC defined in [I-D.ietf-teas-yang-path-computation], as shown in Figure 1. +--------------------------+ o: augment TE generic | ietf-te-path-computation | +--------------------------+ o | | | +---------------------------+ OTN | ietf-otn-path-computation | +---------------------------+ Figure 1: Relationship between OTN and TE path computation models Busi, et al. Expires 23 October 2023 [Page 4] Internet-Draft YANG for OTN Path Computation April 2023 The entities and Traffic Engineering (TE) attributes, such as requested path and tunnel attributes, defined in [I-D.ietf-teas-yang-path-computation], are still applicable when requesting OTN path computation and the models defined in this document only specifies the additional OTN technology-specific attributes/information, using the attributes defined in [I-D.ietf-ccamp-layer1-types]. The YANG module ietf-otn-path-computation defined in this document conforms to the Network Management Datastore Architecture (NMDA) defined in [RFC8342]. 2.2. Bandwidth Augmentation The OTN path computation model augments all the occurrences of the te-bandwidth container with the OTN technology-specific attributes using the otn-link-bandwidth and otn-path-bandwidth groupings defined in [I-D.ietf-ccamp-layer1-types]. 2.3. Label Augmentations The OTN path computation model augments all the occurrences of the label-restriction list with OTN technology-specific attributes using the otn-label-range-info grouping defined in [I-D.ietf-ccamp-layer1-types]. Moreover, the model augments all the occurrences of the te-label container with the OTN technology-specific attributes using the otn- label-start-end, otn-label-hop and otn-label-step groupings defined in [I-D.ietf-ccamp-layer1-types]. 3. OTN Path Computation Tree Diagram Figure 2 below shows the tree diagram of the YANG data model defined in module ietf-otn-path-computation.yang. module: ietf-otn-path-computation augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:te-bandwidth/te-pc:technology: +--:(otn) +-- otn +-- odu-type? identityref +-- (oduflex-type)? +--:(generic) | +-- nominal-bit-rate union +--:(cbr) | +-- client-type identityref Busi, et al. Expires 23 October 2023 [Page 5] Internet-Draft YANG for OTN Path Computation April 2023 +--:(gfp-n-k) | +-- gfp-n uint8 | +-- gfp-k? gfp-k +--:(flexe-client) | +-- flexe-client flexe-client-rate +--:(flexe-aware) | +-- flexe-aware-n uint16 +--:(packet) +-- opuflex-payload-rate union augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:tunnel-attributes/te-pc:te-bandwidth /te-pc:technology: +--:(otn) +-- otn +-- odu-type? identityref +-- (oduflex-type)? +--:(generic) | +-- nominal-bit-rate union +--:(cbr) | +-- client-type identityref +--:(gfp-n-k) | +-- gfp-n uint8 | +-- gfp-k? gfp-k +--:(flexe-client) | +-- flexe-client flexe-client-rate +--:(flexe-aware) | +-- flexe-aware-n uint16 +--:(packet) +-- opuflex-payload-rate union augment /te:tunnels-path-compute/te:output/te:path-compute-result /te-pc:response/te-pc:computed-paths-properties /te-pc:computed-path-properties/te-pc:path-properties /te-pc:te-bandwidth/te-pc:technology: +--:(otn) +--ro otn +--ro odu-type? identityref +--ro (oduflex-type)? +--:(generic) | +--ro nominal-bit-rate union +--:(cbr) | +--ro client-type identityref +--:(gfp-n-k) | +--ro gfp-n uint8 | +--ro gfp-k? gfp-k +--:(flexe-client) | +--ro flexe-client flexe-client-rate +--:(flexe-aware) | +--ro flexe-aware-n uint16 Busi, et al. Expires 23 October 2023 [Page 6] Internet-Draft YANG for OTN Path Computation April 2023 +--:(packet) +--ro opuflex-payload-rate union augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:path-in-segment /te-pc:label-restrictions/te-pc:label-restriction: +-- otn-label-range +-- range-type? otn-label-range-type +-- tsg? identityref +-- odu-type-list* identityref +-- priority? uint8 augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:path-out-segment /te-pc:label-restrictions/te-pc:label-restriction: +-- otn-label-range +-- range-type? otn-label-range-type +-- tsg? identityref +-- odu-type-list* identityref +-- priority? uint8 augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:optimizations/te-pc:algorithm /te-pc:metric/te-pc:optimization-metric /te-pc:explicit-route-exclude-objects /te-pc:route-object-exclude-object/te-pc:type/te-pc:label /te-pc:label-hop/te-pc:te-label/te-pc:technology: +--:(otn) +-- otn +-- tpn? otn-tpn +-- tsg? identityref +-- ts-list? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:optimizations/te-pc:algorithm /te-pc:metric/te-pc:optimization-metric /te-pc:explicit-route-include-objects /te-pc:route-object-include-object/te-pc:type/te-pc:label /te-pc:label-hop/te-pc:te-label/te-pc:technology: +--:(otn) +-- otn +-- tpn? otn-tpn +-- tsg? identityref +-- ts-list? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:explicit-route-objects-always /te-pc:route-object-exclude-always/te-pc:type/te-pc:label /te-pc:label-hop/te-pc:te-label/te-pc:technology: +--:(otn) +-- otn +-- tpn? otn-tpn +-- tsg? identityref Busi, et al. Expires 23 October 2023 [Page 7] Internet-Draft YANG for OTN Path Computation April 2023 +-- ts-list? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:explicit-route-objects-always /te-pc:route-object-include-exclude/te-pc:type /te-pc:label/te-pc:label-hop/te-pc:te-label /te-pc:technology: +--:(otn) +-- otn +-- tpn? otn-tpn +-- tsg? identityref +-- ts-list? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:path-in-segment /te-pc:label-restrictions/te-pc:label-restriction /te-pc:label-start/te-pc:te-label/te-pc:technology: +--:(otn) +-- otn +-- (range-type)? +--:(trib-port) | +-- tpn? otn-tpn +--:(trib-slot) +-- ts? otn-ts augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:path-in-segment /te-pc:label-restrictions/te-pc:label-restriction /te-pc:label-end/te-pc:te-label/te-pc:technology: +--:(otn) +-- otn +-- (range-type)? +--:(trib-port) | +-- tpn? otn-tpn +--:(trib-slot) +-- ts? otn-ts augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:path-in-segment /te-pc:label-restrictions/te-pc:label-restriction /te-pc:label-step/te-pc:technology: +--:(otn) +-- otn +-- (range-type)? +--:(trib-port) | +-- tpn? otn-tpn +--:(trib-slot) +-- ts? otn-ts augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:path-out-segment /te-pc:label-restrictions/te-pc:label-restriction /te-pc:label-start/te-pc:te-label/te-pc:technology: Busi, et al. Expires 23 October 2023 [Page 8] Internet-Draft YANG for OTN Path Computation April 2023 +--:(otn) +-- otn +-- (range-type)? +--:(trib-port) | +-- tpn? otn-tpn +--:(trib-slot) +-- ts? otn-ts augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:path-out-segment /te-pc:label-restrictions/te-pc:label-restriction /te-pc:label-end/te-pc:te-label/te-pc:technology: +--:(otn) +-- otn +-- (range-type)? +--:(trib-port) | +-- tpn? otn-tpn +--:(trib-slot) +-- ts? otn-ts augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:path-request/te-pc:path-out-segment /te-pc:label-restrictions/te-pc:label-restriction /te-pc:label-step/te-pc:technology: +--:(otn) +-- otn +-- (range-type)? +--:(trib-port) | +-- tpn? otn-tpn +--:(trib-slot) +-- ts? otn-ts augment /te:tunnels-path-compute/te:input/te:path-compute-info /te-pc:synchronization/te-pc:exclude-objects /te-pc:excludes/te-pc:type/te-pc:label/te-pc:label-hop /te-pc:te-label/te-pc:technology: +--:(otn) +-- otn +-- tpn? otn-tpn +-- tsg? identityref +-- ts-list? string augment /te:tunnels-path-compute/te:output/te:path-compute-result /te-pc:response/te-pc:computed-paths-properties /te-pc:computed-path-properties/te-pc:path-properties /te-pc:path-route-objects/te-pc:path-route-object /te-pc:type/te-pc:label/te-pc:label-hop/te-pc:te-label /te-pc:technology: +--:(otn) +--ro otn +--ro tpn? otn-tpn +--ro tsg? identityref Busi, et al. Expires 23 October 2023 [Page 9] Internet-Draft YANG for OTN Path Computation April 2023 +--ro ts-list? string Figure 2: OTN path computation tree diagram 4. YANG Model for OTN Path Computation file "ietf-otn-path-computation@2022-07-10.yang" module ietf-otn-path-computation { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-otn-path-computation"; prefix "otn-pc"; import ietf-te-path-computation { prefix "te-pc"; revision-date "2021-09-06"; reference "I-D.ietf-teas-yang-path-computation-14: Yang model for requesting Path Computation."; } import ietf-te { prefix "te"; revision-date "2021-02-20"; reference "I-D.ietf-teas-yang-te-19: A YANG Data Model for Traffic Engineering Tunnels and Interfaces. "; } import ietf-layer1-types { prefix "l1-types"; reference "I-D.ietf-ccamp-layer1-types: A YANG Data Model for Layer 1 Types. "; } organization "IETF CCAMP Working Group"; contact "WG Web: WG List: Editor: Aihua Guo Editor: Italo Busi Editor: Sergio Belotti Busi, et al. Expires 23 October 2023 [Page 10] Internet-Draft YANG for OTN Path Computation April 2023 "; description "This module defines a model for requesting OTN Path Computation. The model fully conforms to the Network Management Datastore Architecture (NMDA). Copyright (c) 2022 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; see the RFC itself for full legal notices."; revision "2022-09-12" { description "Initial version."; reference "RFC XXXX: A YANG Data Model for requesting Path Computation in an Optical Transport Network (OTN)"; // RFC Ed.: replace XXXX with actual RFC number, update date // information and remove this note } /* * Data nodes */ /* * Augment TE bandwidth */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:te-bandwidth/te-pc:technology" { description "Augment TE bandwidth of the requested path."; case otn { uses l1-types:otn-path-bandwidth; } } Busi, et al. Expires 23 October 2023 [Page 11] Internet-Draft YANG for OTN Path Computation April 2023 augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:tunnel-attributes/te-pc:te-bandwidth/" + "te-pc:technology" { description "Augment TE bandwidth of the requested tunnel attributes."; case otn { uses l1-types:otn-path-bandwidth; } } augment "/te:tunnels-path-compute/te:output/" + "te:path-compute-result/te-pc:response/" + "te-pc:computed-paths-properties/" + "te-pc:computed-path-properties/te-pc:path-properties/" + "te-pc:te-bandwidth/te-pc:technology" { description "Augment TE bandwidth of the computed path properties."; case otn { uses l1-types:otn-path-bandwidth; } } /* * Augment TE label range information */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:path-in-segment/" + "te-pc:label-restrictions/te-pc:label-restriction" { description "Augment TE label range information for the ingress segment of the requested path."; uses l1-types:otn-label-range-info; } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:path-out-segment/" + "te-pc:label-restrictions/te-pc:label-restriction" { description "Augment TE label range information for the egress segment of the requested path."; uses l1-types:otn-label-range-info; } /* * Augment TE label. */ Busi, et al. Expires 23 October 2023 [Page 12] Internet-Draft YANG for OTN Path Computation April 2023 augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:optimizations/te-pc:algorithm/" + "te-pc:metric/te-pc:optimization-metric/" + "te-pc:explicit-route-exclude-objects/" + "te-pc:route-object-exclude-object/te-pc:type/te-pc:label/" + "te-pc:label-hop/te-pc:te-label/te-pc:technology" { description "Augment TE label hop for the optimization of the explicit route objects excluded by the path computation of the requested path."; case otn { uses l1-types:otn-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:optimizations/te-pc:algorithm/" + "te-pc:metric/te-pc:optimization-metric/" + "te-pc:explicit-route-include-objects/" + "te-pc:route-object-include-object/te-pc:type/te-pc:label/" + "te-pc:label-hop/te-pc:te-label/te-pc:technology" { description "Augment TE label hop for the optimization of the explicit route objects included by the path computation of the requested path."; case otn { uses l1-types:otn-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:explicit-route-objects-always/" + "te-pc:route-object-exclude-always/te-pc:type/te-pc:label/" + "te-pc:label-hop/te-pc:te-label/te-pc:technology" { description "Augment TE label hop for the explicit route objects always excluded by the path computation of the requested path."; case otn { uses l1-types:otn-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:explicit-route-objects-always/" + "te-pc:route-object-include-exclude/te-pc:type/" + "te-pc:label/te-pc:label-hop/te-pc:te-label/" + "te-pc:technology" { description Busi, et al. Expires 23 October 2023 [Page 13] Internet-Draft YANG for OTN Path Computation April 2023 "Augment TE label hop for the explicit route objects included or excluded by the path computation of the requested path."; case otn { uses l1-types:otn-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:path-in-segment/" + "te-pc:label-restrictions/te-pc:label-restriction/" + "te-pc:label-start/te-pc:te-label/te-pc:technology" { description "Augment TE label range start for the ingress segment of the requested path."; case otn { uses l1-types:otn-label-start-end; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:path-in-segment/" + "te-pc:label-restrictions/te-pc:label-restriction/" + "te-pc:label-end/te-pc:te-label/te-pc:technology" { description "Augment TE label range end for the ingress segment of the requested path."; case otn { uses l1-types:otn-label-start-end; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:path-in-segment/" + "te-pc:label-restrictions/te-pc:label-restriction/" + "te-pc:label-step/te-pc:technology" { description "Augment TE label range step for the ingress segment of the requested path."; case otn { uses l1-types:otn-label-step; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:path-out-segment/" + "te-pc:label-restrictions/te-pc:label-restriction/" + "te-pc:label-start/te-pc:te-label/te-pc:technology" { description Busi, et al. Expires 23 October 2023 [Page 14] Internet-Draft YANG for OTN Path Computation April 2023 "Augment TE label range start for the egress segment of the requested path."; case otn { uses l1-types:otn-label-start-end; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:path-out-segment/" + "te-pc:label-restrictions/te-pc:label-restriction/" + "te-pc:label-end/te-pc:te-label/te-pc:technology" { description "Augment TE label range end for the egress segment of the requested path."; case otn { uses l1-types:otn-label-start-end; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:path-request/te-pc:path-out-segment/" + "te-pc:label-restrictions/te-pc:label-restriction/" + "te-pc:label-step/te-pc:technology" { description "Augment TE label range end for the egress segment of the requested path."; case otn { uses l1-types:otn-label-step; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "te-pc:synchronization/te-pc:exclude-objects/" + "te-pc:excludes/te-pc:type/te-pc:label/te-pc:label-hop/" + "te-pc:te-label/te-pc:technology" { description "Augment TE label hop for the explicit route objects to always exclude from synchronized path computation."; case otn { uses l1-types:otn-label-hop; } } augment "/te:tunnels-path-compute/te:output/" + "te:path-compute-result/te-pc:response/" + "te-pc:computed-paths-properties/" + "te-pc:computed-path-properties/te-pc:path-properties/" + "te-pc:path-route-objects/te-pc:path-route-object/" Busi, et al. Expires 23 October 2023 [Page 15] Internet-Draft YANG for OTN Path Computation April 2023 + "te-pc:type/te-pc:label/" + "te-pc:label-hop/te-pc:te-label/te-pc:technology" { description "Augment TE label hop for the route object of the computed path."; case otn { uses l1-types:otn-label-hop; } } } Figure 3: OTN path computation YANG module 5. Manageability Considerations This document provides a method for requesting path computations for OTN tunnels. Consideration of mechanisms to gather and collate information required for the path computations will be necessary. Furthermore, storing path computation requests and responses and triggering actions will also need to be carefully managed and secured. Future versions of this document will contain additional information. 6. Security Considerations The YANG module defined in this document will be accessed via the NETCONF protocol [RFC6241] or RESTCONF protocol [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 to particular NETCONF or RESTCONF users to a pre-configured subset of all available NETCONF or RESTCONF protocol operations and content. Some of the RPC operations defined in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus essential to control access to these operations. Operations defined in this document, and their sensitivities and possible vulnerabilities, will be discussed further in future versions of this document. Busi, et al. Expires 23 October 2023 [Page 16] Internet-Draft YANG for OTN Path Computation April 2023 7. IANA Considerations This document registers the following URIs in the "ns" subregistry within the "IETF XML registry" [RFC3688]. URI: urn:ietf:params:xml:ns:yang:ietf-otn-path-computation Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. This document registers the following YANG module in the "YANG Module Names" registry [RFC7950]. name: ietf-otn-path-computation namespace: urn:ietf:params:xml:ns:yang:ietf-otn-path-computation prefix: otn-pc reference: this document 8. References 8.1. Normative References [I-D.ietf-ccamp-layer1-types] Zheng, H. and I. Busi, "A YANG Data Model for Layer 1 Types", Work in Progress, Internet-Draft, draft-ietf- ccamp-layer1-types-15, 23 November 2022, . [I-D.ietf-teas-yang-path-computation] Busi, I., Belotti, S., de Dios, O. G., Sharma, A., Shi, Y., and D. Ceccarelli, "A YANG Data Model for requesting path computation", Work in Progress, Internet-Draft, draft-ietf-teas-yang-path-computation-20, 10 March 2023, . [I-D.ietf-teas-yang-te] Saad, T., Gandhi, R., Liu, X., Beeram, V. P., Bryskin, I., and O. G. de Dios, "A YANG Data Model for Traffic Engineering Tunnels, Label Switched Paths and Interfaces", Work in Progress, Internet-Draft, draft-ietf-teas-yang-te- 32, 12 March 2023, . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . Busi, et al. Expires 23 October 2023 [Page 17] Internet-Draft YANG for OTN Path Computation April 2023 [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, . [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, . [RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . 8.2. Informative References [I-D.draft-gbb-ccamp-optical-path-computation-yang] Busi, I., Guo, A., and S. Belotti, "YANG Data Models for requesting Path Computation in Optical Networks", Work in Progress, Internet-Draft, draft-gbb-ccamp-optical-path- computation-yang-02, 12 September 2022, . [I-D.ietf-ccamp-otn-topo-yang] Zheng, H., Busi, I., Liu, X., Belotti, S., and O. G. de Dios, "A YANG Data Model for Optical Transport Network Busi, et al. Expires 23 October 2023 [Page 18] Internet-Draft YANG for OTN Path Computation April 2023 Topology", Work in Progress, Internet-Draft, draft-ietf- ccamp-otn-topo-yang-16, 23 November 2022, . [I-D.ietf-teas-actn-poi-applicability] Peruzzini, F., Bouquier, J., Busi, I., King, D., and D. Ceccarelli, "Applicability of Abstraction and Control of Traffic Engineered Networks (ACTN) to Packet Optical Integration (POI)", Work in Progress, Internet-Draft, draft-ietf-teas-actn-poi-applicability-08, 11 January 2023, . Appendix A. Change Log The initial YANG data model requesting path computation in optical networks was draft-gbb-ccamp-optical-path-computation-yang-00. This document included path computation request capabilities for WSON, Flexi-Grid and OTN technologies. However, it was proposed at IETF 113 (March 25, 2022) to split the initial document into separate documents for WDM (WSON and Flexi-Grid) and OTN technologies, as each technology may be developed and implemented separately. The WDM technology capabilities were kept in [I-D.draft-gbb-ccamp-optical-path-computation-yang], and the OTN capabilities were moved into this document. Editors note, please remove this appendix before publication. Acknowledgments The authors of this document would like to thank the authors of [I-D.ietf-teas-actn-poi-applicability] for having identified the gap and requirements to trigger this work. This document was prepared using kramdown. Contributors Daniel King Old Dog Consulting Email: daniel@olddog.co.uk Authors' Addresses Busi, et al. Expires 23 October 2023 [Page 19] Internet-Draft YANG for OTN Path Computation April 2023 Italo Busi Huawei Technologies Email: italo.busi@huawei.com Aihua Guo Futurewei Technologies Email: aihuaguo.ietf@gmail.com Sergio Belotti Nokia Email: sergio.belotti@nokia.com Busi, et al. Expires 23 October 2023 [Page 20]