CCAMP Working Group I. Busi Internet-Draft Huawei Technologies Intended status: Standards Track A. Guo Expires: 16 March 2023 Futurewei Technologies S. Belotti Nokia 12 September 2022 YANG Data Models for requesting Path Computation in Optical Networks draft-gbb-ccamp-optical-path-computation-yang-02 Abstract This document provides a mechanism to request path computation in Optical Networks (WSON and Flexi-grid) 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 16 March 2023. Copyright Notice Copyright (c) 2022 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 Busi, et al. Expires 16 March 2023 [Page 1] Internet-Draft Yang for Optical Path Computation September 2022 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 Models for Optical Path Computation . . . . . . . . 4 2.1. YANG Models Overview . . . . . . . . . . . . . . . . . . 4 2.2. Attributes Augmentation . . . . . . . . . . . . . . . . . 5 2.3. Bandwidth Augmentation . . . . . . . . . . . . . . . . . 5 2.4. Label Augmentations . . . . . . . . . . . . . . . . . . . 5 3. Optical Path Computation Tree Diagrams . . . . . . . . . . . 5 3.1. WSON Path Computation Tree Diagrams . . . . . . . . . . . 5 3.2. Flexi-grid Path Computation Tree Diagrams . . . . . . . . 10 4. YANG Models for Optical Path Computation . . . . . . . . . . 14 4.1. YANG Model for WSON Path Computation . . . . . . . . . . 14 4.2. YANG Model for Flexi-grid Path Computation . . . . . . . 22 5. Manageability Considerations . . . . . . . . . . . . . . . . 31 6. Security Considerations . . . . . . . . . . . . . . . . . . . 31 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 31 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 32 8.1. Normative References . . . . . . . . . . . . . . . . . . 32 8.2. Informative References . . . . . . . . . . . . . . . . . 33 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 34 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 34 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 a single-layer optical technologies, including Optical Transport Network (OTN), Wavelength Switched Optical Networks (WSON), Flexi-grid, and multi-layer Optical network. This document defines YANG data models, which augment the generic Path Computation RPC defined in [I-D.ietf-teas-yang-path-computation], with technology-specific augmentations required to request path computation to an underlying Optical SDN controller. These models allow a client to delegate path computation tasks to the underlying Optical SDN controller without having to obtain optical-layer information from the controller and performing feasible path computation itself. This is especially Busi, et al. Expires 16 March 2023 [Page 2] Internet-Draft Yang for Optical Path Computation September 2022 helpful in cases where computing optically-feasible paths require knowledge of physical-layer states, such as optical impairments, which are visible only to the Optical controller. 1.1. Terminology and Notations Refer to [RFC7446] and [RFC7581] for the key 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 16 March 2023 [Page 3] Internet-Draft Yang for Optical Path Computation September 2022 +==========+==================================+===========+ | Prefix | YANG module | Reference | +==========+==================================+===========+ | l0-types | ietf-layer0-types | [RFCZZZZ] | +----------+----------------------------------+-----------+ | te | ietf-te | [RFCKKKK] | +----------+----------------------------------+-----------+ | tepc | ietf-te-path-computation | [RFCYYYY] | +----------+----------------------------------+-----------+ | wson-pc | ietf-wson-path-computation | RFCXXXX | +----------+----------------------------------+-----------+ | flexg-pc | ietf-flexi-grid-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 ZZZZ with the RFC number assigned to [I-D.ietf-ccamp-rfc9093-bis]. Please replace KKKK with the RFC number assigned to [I-D.ietf-teas-yang-te]. Please replace YYYY with the RFC number assigned to [I-D.ietf-teas-yang-path-computation]. Please remove this note. 2. YANG Data Models for Optical Path Computation 2.1. YANG Models Overview The YANG data models for requesting WSON and Flexi-grid path computation are defined as augmentations 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 o | | | | +-----------+ +-----------+ | | | | +----------------------------+ +----------------------------------+ | ietf-wson-path-computation | | ietf-flexi-grid-path-computation | +----------------------------+ +----------------------------------+ WSON Flexi-grid Figure 1: Relationship between WSON, Flexi-grid and TE path computation models Busi, et al. Expires 16 March 2023 [Page 4] Internet-Draft Yang for Optical Path Computation September 2022 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 WSON and Flexi-grid path computation and the models defined in this document only specifies the additional technology- specific attributes/information, using the attributes defined in [I-D.ietf-ccamp-rfc9093-bis]. 2.2. Attributes Augmentation The common characteristics for layer 0 (WSON and Flexi-grid) tunnels are under definition in [I-D.ietf-ccamp-rfc9093-bis] and re-used in the ietf-wson-path-computation and ietf-flexi-grid-path-computation YANG models 2.3. Bandwidth Augmentation As described in Section 4.2 of [RFC7699], there is some overlap between bandwidth and label in layer0. The WSON and flexi-grid label resource information described in Section 2.4, is sufficient to describe also the spectrum resources within WSON and flexi-grid networks. Therefore, the model does not define any augmentation for the te-bandwidth containers defined in [I-D.ietf-teas-yang-path-computation]. 2.4. Label Augmentations The models augment all the occurrences of the label-restriction list with WSON and Flexi-grid technology-specific attributes using the l0- label-range-info and flexi-grid-label-range-info groupings defined in [I-D.ietf-ccamp-rfc9093-bis]. Moreover, the models augment all the occurrences of the te-label container with the WSON, Flexi-grid and OTN technology-specific attributes using the wson-label-start-end, wson-label-hop, wson- label-step, flexi-grid-label-start-end, flexi-grid-label-hop and flexi-grid-label-step defined in [I-D.ietf-ccamp-rfc9093-bis]. 3. Optical Path Computation Tree Diagrams 3.1. WSON Path Computation Tree Diagrams Figure 2 below shows the tree diagram of the YANG data model defined in module ietf-wson-path-computation.yang. Busi, et al. Expires 16 March 2023 [Page 5] Internet-Draft Yang for Optical Path Computation September 2022 module: ietf-wson-path-computation augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request: +-- bit-stuffing? boolean +-- wavelength-assignment? identityref +-- gsnr-margin? snr augment /te:tunnels-path-compute/te:output/te:path-compute-result /tepc:response/tepc:computed-paths-properties /tepc:computed-path-properties/tepc:path-properties: +--ro estimated-gsnr? snr augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:optimizations/tepc:algorithm /tepc:metric/tepc:optimization-metric /tepc:explicit-route-exclude-objects /tepc:route-object-exclude-object/tepc:type: +--:(oms-element) +-- oms-element-uid? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:optimizations/tepc:algorithm /tepc:metric/tepc:optimization-metric /tepc:explicit-route-include-objects /tepc:route-object-include-object/tepc:type: +--:(oms-element) +-- oms-element-uid? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:explicit-route-objects-always /tepc:route-object-exclude-always/tepc:type: +--:(oms-element) +-- oms-element-uid? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:explicit-route-objects-always /tepc:route-object-include-exclude/tepc:type: +--:(oms-element) +-- oms-element-uid? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:synchronization/tepc:exclude-objects/tepc:excludes /tepc:type: +--:(oms-element) +-- oms-element-uid? string augment /te:tunnels-path-compute/te:output/te:path-compute-result /tepc:response/tepc:computed-paths-properties /tepc:computed-path-properties/tepc:path-properties /tepc:path-route-objects/tepc:path-route-object /tepc:type: +--:(oms-element) +--ro oms-element-uid? string augment /te:tunnels-path-compute/te:input/te:path-compute-info Busi, et al. Expires 16 March 2023 [Page 6] Internet-Draft Yang for Optical Path Computation September 2022 /tepc:path-request/tepc:path-in-segment /tepc:label-restrictions/tepc:label-restriction: +-- grid-type? identityref +-- priority? uint8 augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-out-segment /tepc:label-restrictions/tepc:label-restriction: +-- grid-type? identityref +-- priority? uint8 augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:optimizations/tepc:algorithm /tepc:metric/tepc:optimization-metric /tepc:explicit-route-exclude-objects /tepc:route-object-exclude-object/tepc:type/tepc:label /tepc:label-hop/tepc:te-label/tepc:technology: +--:(wson) +-- (grid-type)? +--:(dwdm) | +-- (single-or-super-channel)? | +--:(single) | | +-- dwdm-n? l0-types:dwdm-n | +--:(super) | +-- subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) +-- cwdm-n? l0-types:cwdm-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:optimizations/tepc:algorithm /tepc:metric/tepc:optimization-metric /tepc:explicit-route-include-objects /tepc:route-object-include-object/tepc:type/tepc:label /tepc:label-hop/tepc:te-label/tepc:technology: +--:(wson) +-- (grid-type)? +--:(dwdm) | +-- (single-or-super-channel)? | +--:(single) | | +-- dwdm-n? l0-types:dwdm-n | +--:(super) | +-- subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) +-- cwdm-n? l0-types:cwdm-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:explicit-route-objects-always /tepc:route-object-exclude-always/tepc:type/tepc:label /tepc:label-hop/tepc:te-label/tepc:technology: +--:(wson) +-- (grid-type)? +--:(dwdm) Busi, et al. Expires 16 March 2023 [Page 7] Internet-Draft Yang for Optical Path Computation September 2022 | +-- (single-or-super-channel)? | +--:(single) | | +-- dwdm-n? l0-types:dwdm-n | +--:(super) | +-- subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) +-- cwdm-n? l0-types:cwdm-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:explicit-route-objects-always /tepc:route-object-include-exclude/tepc:type/tepc:label /tepc:label-hop/tepc:te-label/tepc:technology: +--:(wson) +-- (grid-type)? +--:(dwdm) | +-- (single-or-super-channel)? | +--:(single) | | +-- dwdm-n? l0-types:dwdm-n | +--:(super) | +-- subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) +-- cwdm-n? l0-types:cwdm-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-in-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-start/tepc:te-label/tepc:technology: +--:(wson) +-- (grid-type)? +--:(dwdm) | +-- dwdm-n? l0-types:dwdm-n +--:(cwdm) +-- cwdm-n? l0-types:cwdm-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-in-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-end/tepc:te-label/tepc:technology: +--:(wson) +-- (grid-type)? +--:(dwdm) | +-- dwdm-n? l0-types:dwdm-n +--:(cwdm) +-- cwdm-n? l0-types:cwdm-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-in-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-step/tepc:technology: +--:(wson) +-- (l0-grid-type)? +--:(dwdm) Busi, et al. Expires 16 March 2023 [Page 8] Internet-Draft Yang for Optical Path Computation September 2022 | +-- wson-dwdm-channel-spacing? identityref +--:(cwdm) +-- wson-cwdm-channel-spacing? identityref augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-out-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-start/tepc:te-label/tepc:technology: +--:(wson) +-- (grid-type)? +--:(dwdm) | +-- dwdm-n? l0-types:dwdm-n +--:(cwdm) +-- cwdm-n? l0-types:cwdm-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-out-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-end/tepc:te-label/tepc:technology: +--:(wson) +-- (grid-type)? +--:(dwdm) | +-- dwdm-n? l0-types:dwdm-n +--:(cwdm) +-- cwdm-n? l0-types:cwdm-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-out-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-step/tepc:technology: +--:(wson) +-- (l0-grid-type)? +--:(dwdm) | +-- wson-dwdm-channel-spacing? identityref +--:(cwdm) +-- wson-cwdm-channel-spacing? identityref augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:synchronization/tepc:exclude-objects/tepc:excludes /tepc:type/tepc:label/tepc:label-hop/tepc:te-label /tepc:technology: +--:(wson) +-- (grid-type)? +--:(dwdm) | +-- (single-or-super-channel)? | +--:(single) | | +-- dwdm-n? l0-types:dwdm-n | +--:(super) | +-- subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) +-- cwdm-n? l0-types:cwdm-n augment /te:tunnels-path-compute/te:output/te:path-compute-result Busi, et al. Expires 16 March 2023 [Page 9] Internet-Draft Yang for Optical Path Computation September 2022 /tepc:response/tepc:computed-paths-properties /tepc:computed-path-properties/tepc:path-properties /tepc:path-route-objects/tepc:path-route-object/tepc:type /tepc:label/tepc:label-hop/tepc:te-label/tepc:technology: +--:(wson) +--ro (grid-type)? +--:(dwdm) | +--ro (single-or-super-channel)? | +--:(single) | | +--ro dwdm-n? l0-types:dwdm-n | +--:(super) | +--ro subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) +--ro cwdm-n? l0-types:cwdm-n Figure 2: WSON path computation tree diagram 3.2. Flexi-grid Path Computation Tree Diagrams Figure 3 below shows the tree diagram of the YANG data model defined in module ietf-flexi-grid-path-computation.yang. module: ietf-flexi-grid-path-computation augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request: +-- bit-stuffing? boolean +-- wavelength-assignment? identityref +-- gsnr-margin? snr augment /te:tunnels-path-compute/te:output/te:path-compute-result /tepc:response/tepc:computed-paths-properties /tepc:computed-path-properties/tepc:path-properties: +--ro estimated-gsnr? snr augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:optimizations/tepc:algorithm /tepc:metric/tepc:optimization-metric /tepc:explicit-route-exclude-objects /tepc:route-object-exclude-object/tepc:type: +--:(oms-element) +-- oms-element-uid? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:optimizations/tepc:algorithm /tepc:metric/tepc:optimization-metric /tepc:explicit-route-include-objects /tepc:route-object-include-object/tepc:type: +--:(oms-element) +-- oms-element-uid? string augment /te:tunnels-path-compute/te:input/te:path-compute-info Busi, et al. Expires 16 March 2023 [Page 10] Internet-Draft Yang for Optical Path Computation September 2022 /tepc:path-request/tepc:explicit-route-objects-always /tepc:route-object-exclude-always/tepc:type: +--:(oms-element) +-- oms-element-uid? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:explicit-route-objects-always /tepc:route-object-include-exclude/tepc:type: +--:(oms-element) +-- oms-element-uid? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:synchronization/tepc:exclude-objects/tepc:excludes /tepc:type: +--:(oms-element) +-- oms-element-uid? string augment /te:tunnels-path-compute/te:output/te:path-compute-result /tepc:response/tepc:computed-paths-properties /tepc:computed-path-properties/tepc:path-properties /tepc:path-route-objects/tepc:path-route-object /tepc:type: +--:(oms-element) +--ro oms-element-uid? string augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-in-segment /tepc:label-restrictions/tepc:label-restriction: +-- grid-type? identityref +-- priority? uint8 +-- flexi-grid +-- slot-width-granularity? identityref +-- min-slot-width-factor? uint16 +-- max-slot-width-factor? uint16 augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-out-segment /tepc:label-restrictions/tepc:label-restriction: +-- grid-type? identityref +-- priority? uint8 +-- flexi-grid +-- slot-width-granularity? identityref +-- min-slot-width-factor? uint16 +-- max-slot-width-factor? uint16 augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:optimizations/tepc:algorithm /tepc:metric/tepc:optimization-metric /tepc:explicit-route-exclude-objects /tepc:route-object-exclude-object/tepc:type/tepc:label /tepc:label-hop/tepc:te-label/tepc:technology: +--:(flexi-grid) +-- (single-or-super-channel)? +--:(single) Busi, et al. Expires 16 March 2023 [Page 11] Internet-Draft Yang for Optical Path Computation September 2022 | +-- flexi-n? l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m +--:(super) +-- subcarrier-flexi-n* [flexi-n] +-- flexi-n l0-types:flexi-n +-- flexi-m? l0-types:flexi-m augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:optimizations/tepc:algorithm /tepc:metric/tepc:optimization-metric /tepc:explicit-route-include-objects /tepc:route-object-include-object/tepc:type/tepc:label /tepc:label-hop/tepc:te-label/tepc:technology: +--:(flexi-grid) +-- (single-or-super-channel)? +--:(single) | +-- flexi-n? l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m +--:(super) +-- subcarrier-flexi-n* [flexi-n] +-- flexi-n l0-types:flexi-n +-- flexi-m? l0-types:flexi-m augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:explicit-route-objects-always /tepc:route-object-exclude-always/tepc:type/tepc:label /tepc:label-hop/tepc:te-label/tepc:technology: +--:(flexi-grid) +-- (single-or-super-channel)? +--:(single) | +-- flexi-n? l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m +--:(super) +-- subcarrier-flexi-n* [flexi-n] +-- flexi-n l0-types:flexi-n +-- flexi-m? l0-types:flexi-m augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:explicit-route-objects-always /tepc:route-object-include-exclude/tepc:type/tepc:label /tepc:label-hop/tepc:te-label/tepc:technology: +--:(flexi-grid) +-- (single-or-super-channel)? +--:(single) | +-- flexi-n? l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m +--:(super) +-- subcarrier-flexi-n* [flexi-n] +-- flexi-n l0-types:flexi-n +-- flexi-m? l0-types:flexi-m augment /te:tunnels-path-compute/te:input/te:path-compute-info Busi, et al. Expires 16 March 2023 [Page 12] Internet-Draft Yang for Optical Path Computation September 2022 /tepc:path-request/tepc:path-in-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-start/tepc:te-label/tepc:technology: +--:(flexi-grid) +-- flexi-n? l0-types:flexi-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-in-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-end/tepc:te-label/tepc:technology: +--:(flexi-grid) +-- flexi-n? l0-types:flexi-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-in-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-step/tepc:technology: +--:(flexi-grid) +-- flexi-grid-channel-spacing? identityref +-- flexi-n-step? uint8 augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-out-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-start/tepc:te-label/tepc:technology: +--:(flexi-grid) +-- flexi-n? l0-types:flexi-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-out-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-end/tepc:te-label/tepc:technology: +--:(flexi-grid) +-- flexi-n? l0-types:flexi-n augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:path-out-segment /tepc:label-restrictions/tepc:label-restriction /tepc:label-step/tepc:technology: +--:(flexi-grid) +-- flexi-grid-channel-spacing? identityref +-- flexi-n-step? uint8 augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:synchronization/tepc:exclude-objects/tepc:excludes /tepc:type/tepc:label/tepc:label-hop/tepc:te-label /tepc:technology: +--:(flexi-grid) +-- (single-or-super-channel)? +--:(single) | +-- flexi-n? l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m +--:(super) +-- subcarrier-flexi-n* [flexi-n] Busi, et al. Expires 16 March 2023 [Page 13] Internet-Draft Yang for Optical Path Computation September 2022 +-- flexi-n l0-types:flexi-n +-- flexi-m? l0-types:flexi-m augment /te:tunnels-path-compute/te:output/te:path-compute-result /tepc:response/tepc:computed-paths-properties /tepc:computed-path-properties/tepc:path-properties /tepc:path-route-objects/tepc:path-route-object/tepc:type /tepc:label/tepc:label-hop/tepc:te-label/tepc:technology: +--:(flexi-grid) +--ro (single-or-super-channel)? +--:(single) | +--ro flexi-n? l0-types:flexi-n | +--ro flexi-m? l0-types:flexi-m +--:(super) +--ro subcarrier-flexi-n* [flexi-n] +--ro flexi-n l0-types:flexi-n +--ro flexi-m? l0-types:flexi-m Figure 3: Flexi-grid path computation tree diagram 4. YANG Models for Optical Path Computation 4.1. YANG Model for WSON Path Computation file "ietf-wson-path-computation@2022-09-08.yang" module ietf-wson-path-computation { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-wson-path-computation"; prefix "wson-pc"; import ietf-te-path-computation { prefix "tepc"; 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-layer0-types { prefix "l0-types"; reference Busi, et al. Expires 16 March 2023 [Page 14] Internet-Draft Yang for Optical Path Computation September 2022 "I-D.ietf-ccamp-rfc9093-bis: A YANG Data Model for Layer 0 Types."; } organization "IETF CCAMP Working Group"; contact "WG Web: WG List: Editor: Aihua Guo Editor: Italo Busi Editor: Sergio Belotti "; description "This module defines a model for requesting WSON 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 "2022-09-08" { description "Initial version."; reference "RFC XXXX: YANG Data Models for requesting Path Computation in Optical Networks."; // RFC Ed.: replace XXXX with actual RFC number, update date // information and remove this note } Busi, et al. Expires 16 March 2023 [Page 15] Internet-Draft Yang for Optical Path Computation September 2022 /* * Data nodes */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request" { description "Augment with additional constraints for WSON paths."; uses l0-types:l0-tunnel-attributes; uses l0-types:l0-path-constraints; } augment "/te:tunnels-path-compute/te:output/" + "te:path-compute-result/tepc:response/" + "tepc:computed-paths-properties/" + "tepc:computed-path-properties/tepc:path-properties" { description "Augment with additional properties for WSON paths."; uses l0-types:l0-path-properties; } /* * Augment Route Hop */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:optimizations/tepc:algorithm/" + "tepc:metric/tepc:optimization-metric/" + "tepc:explicit-route-exclude-objects/" + "tepc:route-object-exclude-object/tepc:type" { description "Augment the route hop for the optimization of the explicit route objects excluded by the path computation of the requested path."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:optimizations/tepc:algorithm/" + "tepc:metric/tepc:optimization-metric/" Busi, et al. Expires 16 March 2023 [Page 16] Internet-Draft Yang for Optical Path Computation September 2022 + "tepc:explicit-route-include-objects/" + "tepc:route-object-include-object/tepc:type" { description "Augment the route hop for the optimization of the explicit route objects included by the path computation of the requested path."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects-always/" + "tepc:route-object-exclude-always/tepc:type" { description "Augment the route hop for the explicit route objects always excluded by the path computation of the requested path."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects-always/" + "tepc:route-object-include-exclude/tepc:type" { description "Augment the route hop for the explicit route objects included or excluded by the path computation of the requested path."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; Busi, et al. Expires 16 March 2023 [Page 17] Internet-Draft Yang for Optical Path Computation September 2022 } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:synchronization/tepc:exclude-objects/tepc:excludes/" + "tepc:type" { description "Augment the route hop for the explicit route objects to always exclude from synchronized path computation."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; } } augment "/te:tunnels-path-compute/te:output/" + "te:path-compute-result/tepc:response/" + "tepc:computed-paths-properties/" + "tepc:computed-path-properties/tepc:path-properties/" + "tepc:path-route-objects/tepc:path-route-object/" + "tepc:type" { description "Augment the route hop for the route object of the computed path."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; } } /* * Augment TE label range information */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-in-segment/" + "tepc:label-restrictions/tepc:label-restriction" { description Busi, et al. Expires 16 March 2023 [Page 18] Internet-Draft Yang for Optical Path Computation September 2022 "Augment TE label range information for the ingress segment of the requested path."; uses l0-types:l0-label-range-info; } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-out-segment/" + "tepc:label-restrictions/tepc:label-restriction" { description "Augment TE label range information for the egress segment of the requested path."; uses l0-types:l0-label-range-info; } /* * Augment TE label. */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:optimizations/tepc:algorithm/" + "tepc:metric/tepc:optimization-metric/" + "tepc:explicit-route-exclude-objects/" + "tepc:route-object-exclude-object/tepc:type/tepc:label/" + "tepc:label-hop/tepc:te-label/tepc:technology" { description "Augment TE label hop for the optimization of the explicit route objects excluded by the path computation of the requested path."; case wson { uses l0-types:wson-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:optimizations/tepc:algorithm/" + "tepc:metric/tepc:optimization-metric/" + "tepc:explicit-route-include-objects/" + "tepc:route-object-include-object/tepc:type/tepc:label/" + "tepc:label-hop/tepc:te-label/tepc:technology" { description "Augment TE label hop for the optimization of the explicit route objects included by the path computation of the requested path."; case wson { uses l0-types:wson-label-hop; } } Busi, et al. Expires 16 March 2023 [Page 19] Internet-Draft Yang for Optical Path Computation September 2022 augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects-always/" + "tepc:route-object-exclude-always/tepc:type/tepc:label/" + "tepc:label-hop/tepc:te-label/tepc:technology" { description "Augment TE label hop for the explicit route objects always excluded by the path computation of the requested path."; case wson { uses l0-types:wson-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects-always/" + "tepc:route-object-include-exclude/tepc:type/tepc:label/" + "tepc:label-hop/tepc:te-label/tepc:technology" { description "Augment TE label hop for the explicit route objects included or excluded by the path computation of the requested path."; case wson { uses l0-types:wson-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-in-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-start/tepc:te-label/tepc:technology" { description "Augment TE label range start for the ingress segment of the requested path."; case wson { uses l0-types:wson-label-start-end; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-in-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-end/tepc:te-label/tepc:technology" { description "Augment TE label range end for the ingress segment of the requested path."; case wson { uses l0-types:wson-label-start-end; } } Busi, et al. Expires 16 March 2023 [Page 20] Internet-Draft Yang for Optical Path Computation September 2022 augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-in-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-step/tepc:technology" { description "Augment TE label range step for the ingress segment of the requested path."; case wson { uses l0-types:wson-label-step; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-out-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-start/tepc:te-label/tepc:technology" { description "Augment TE label range start for the egress segment of the requested path."; case wson { uses l0-types:wson-label-start-end; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-out-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-end/tepc:te-label/tepc:technology" { description "Augment TE label range end for the egress segment of the requested path."; case wson { uses l0-types:wson-label-start-end; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-out-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-step/tepc:technology" { description "Augment TE label range end for the egress segment of the requested path."; case wson { uses l0-types:wson-label-step; } } Busi, et al. Expires 16 March 2023 [Page 21] Internet-Draft Yang for Optical Path Computation September 2022 augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:synchronization/tepc:exclude-objects/tepc:excludes/" + "tepc:type/tepc:label/tepc:label-hop/" + "tepc:te-label/tepc:technology" { description "Augment TE label hop for the explicit route objects to always exclude from synchronized path computation."; case wson { uses l0-types:wson-label-hop; } } augment "/te:tunnels-path-compute/te:output/" + "te:path-compute-result/tepc:response/" + "tepc:computed-paths-properties/" + "tepc:computed-path-properties/tepc:path-properties/" + "tepc:path-route-objects/tepc:path-route-object/" + "tepc:type/tepc:label/" + "tepc:label-hop/tepc:te-label/tepc:technology" { description "Augment TE label hop for the route object of the computed path."; case wson { uses l0-types:wson-label-hop; } } } Figure 4: WSON path computation YANG module 4.2. YANG Model for Flexi-grid Path Computation file "ietf-flexi-grid-path-computation@2022-09-08.yang" module ietf-flexi-grid-path-computation { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-flexi-grid-path-computation"; prefix "flexg-pc"; import ietf-te-path-computation { prefix "tepc"; revision-date "2021-09-06"; reference "I-D.ietf-teas-yang-path-computation-14: Yang model for requesting Path Computation."; } Busi, et al. Expires 16 March 2023 [Page 22] Internet-Draft Yang for Optical Path Computation September 2022 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-layer0-types { prefix "l0-types"; reference "I-D.ietf-ccamp-rfc9093-bis: A YANG Data Model for Layer 0 Types."; } organization "IETF CCAMP Working Group"; contact "WG Web: WG List: Editor: Aihua Guo Editor: Italo Busi Editor: Sergio Belotti "; description "This module defines a model for requesting Flexi-grid 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 Busi, et al. Expires 16 March 2023 [Page 23] Internet-Draft Yang for Optical Path Computation September 2022 the RFC itself for full legal notices."; revision "2022-09-08" { description "Initial version."; reference "RFC XXXX: YANG Data Models for requesting Path Computation in Optical Networks."; // RFC Ed.: replace XXXX with actual RFC number, update date // information and remove this note } /* * Data nodes */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request" { description "Augment with additional constraints flexi-grid media channel."; uses l0-types:l0-tunnel-attributes; uses l0-types:l0-path-constraints; } augment "/te:tunnels-path-compute/te:output/" + "te:path-compute-result/tepc:response/" + "tepc:computed-paths-properties/" + "tepc:computed-path-properties/tepc:path-properties" { description "Augment with additional properties for Flexi-grid paths."; uses l0-types:l0-path-properties; } /* * Augment Route Hop */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:optimizations/tepc:algorithm/" + "tepc:metric/tepc:optimization-metric/" + "tepc:explicit-route-exclude-objects/" + "tepc:route-object-exclude-object/tepc:type" { description "Augment the route hop for the optimization of the explicit route objects excluded by the path computation of the requested path."; case oms-element { Busi, et al. Expires 16 March 2023 [Page 24] Internet-Draft Yang for Optical Path Computation September 2022 leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:optimizations/tepc:algorithm/" + "tepc:metric/tepc:optimization-metric/" + "tepc:explicit-route-include-objects/" + "tepc:route-object-include-object/tepc:type" { description "Augment the route hop for the optimization of the explicit route objects included by the path computation of the requested path."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects-always/" + "tepc:route-object-exclude-always/tepc:type" { description "Augment the route hop for the explicit route objects always excluded by the path computation of the requested path."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" Busi, et al. Expires 16 March 2023 [Page 25] Internet-Draft Yang for Optical Path Computation September 2022 + "tepc:path-request/tepc:explicit-route-objects-always/" + "tepc:route-object-include-exclude/tepc:type" { description "Augment the route hop for the explicit route objects included or excluded by the path computation of the requested path."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:synchronization/tepc:exclude-objects/tepc:excludes/" + "tepc:type" { description "Augment the route hop for the explicit route objects to always exclude from synchronized path computation."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } description "The OMS element route hop type"; } } augment "/te:tunnels-path-compute/te:output/" + "te:path-compute-result/tepc:response/" + "tepc:computed-paths-properties/" + "tepc:computed-path-properties/tepc:path-properties/" + "tepc:path-route-objects/tepc:path-route-object/" + "tepc:type" { description "Augment the route hop for the route object of the computed path."; case oms-element { leaf oms-element-uid { type string; description "The unique id of the OMS element."; } Busi, et al. Expires 16 March 2023 [Page 26] Internet-Draft Yang for Optical Path Computation September 2022 description "The OMS element route hop type"; } } /* * Augment TE label range information */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-in-segment/" + "tepc:label-restrictions/tepc:label-restriction" { description "Augment TE label range information for the ingress segment of the requested path."; uses l0-types:flexi-grid-label-range-info; } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-out-segment/" + "tepc:label-restrictions/tepc:label-restriction" { description "Augment TE label range information for the egress segment of the requested path."; uses l0-types:flexi-grid-label-range-info; } /* * Augment TE label. */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:optimizations/tepc:algorithm/" + "tepc:metric/tepc:optimization-metric/" + "tepc:explicit-route-exclude-objects/" + "tepc:route-object-exclude-object/tepc:type/tepc:label/" + "tepc:label-hop/tepc:te-label/tepc:technology" { description "Augment TE label hop for the optimization of the explicit route objects excluded by the path computation of the requested path."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:optimizations/tepc:algorithm/" Busi, et al. Expires 16 March 2023 [Page 27] Internet-Draft Yang for Optical Path Computation September 2022 + "tepc:metric/tepc:optimization-metric/" + "tepc:explicit-route-include-objects/" + "tepc:route-object-include-object/tepc:type/tepc:label/" + "tepc:label-hop/tepc:te-label/tepc:technology" { description "Augment TE label hop for the optimization of the explicit route objects included by the path computation of the requested path."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects-always/" + "tepc:route-object-exclude-always/tepc:type/tepc:label/" + "tepc:label-hop/tepc:te-label/tepc:technology" { description "Augment TE label hop for the explicit route objects always excluded by the path computation of the requested path."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects-always/" + "tepc:route-object-include-exclude/tepc:type/tepc:label/" + "tepc:label-hop/tepc:te-label/tepc:technology" { description "Augment TE label hop for the explicit route objects included or excluded by the path computation of the requested path."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-in-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-start/tepc:te-label/tepc:technology" { description "Augment TE label range start for the ingress segment of the requested path."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } Busi, et al. Expires 16 March 2023 [Page 28] Internet-Draft Yang for Optical Path Computation September 2022 augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-in-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-end/tepc:te-label/tepc:technology" { description "Augment TE label range end for the ingress segment of the requested path."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-in-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-step/tepc:technology" { description "Augment TE label range step for the ingress segment of the requested path."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-out-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-start/tepc:te-label/tepc:technology" { description "Augment TE label range start for the egress segment of the requested path."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-out-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-end/tepc:te-label/tepc:technology" { description "Augment TE label range end for the egress segment of the requested path."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } Busi, et al. Expires 16 March 2023 [Page 29] Internet-Draft Yang for Optical Path Computation September 2022 augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:path-out-segment/" + "tepc:label-restrictions/tepc:label-restriction/" + "tepc:label-step/tepc:technology" { description "Augment TE label range end for the egress segment of the requested path."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:synchronization/tepc:exclude-objects/tepc:excludes/" + "tepc:type/tepc:label/tepc:label-hop/" + "tepc:te-label/tepc:technology" { description "Augment TE label hop for the explicit route objects to always exclude from synchronized path computation."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/te:tunnels-path-compute/te:output/" + "te:path-compute-result/tepc:response/" + "tepc:computed-paths-properties/" + "tepc:computed-path-properties/tepc:path-properties/" + "tepc:path-route-objects/tepc:path-route-object/" + "tepc:type/tepc:label/" + "tepc:label-hop/tepc:te-label/tepc:technology" { description "Augment TE label hop for the route object of the computed path."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } } Figure 5: Flexi-grid path computation YANG module Busi, et al. Expires 16 March 2023 [Page 30] Internet-Draft Yang for Optical Path Computation September 2022 5. Manageability Considerations This document provides a method for requesting path computations for WSON and Flexi-Grid 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. 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-wson-path-computation Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-flexi-grid-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]. Busi, et al. Expires 16 March 2023 [Page 31] Internet-Draft Yang for Optical Path Computation September 2022 name: ietf-wson-path-computation namespace: urn:ietf:params:xml:ns:yang:ietf-wson-path-computation prefix: wson-pc reference: this document name: ietf-flexi-grid-path-computation namespace: ietf:params:xml:ns:yang:ietf-flexi-grid-path-computation prefix: flexg-pc reference: this document 8. References 8.1. Normative References [I-D.ietf-ccamp-rfc9093-bis] Zheng, H., Lee, Y., Guo, A., Lopez, V., King, D., Beller, D., Belotti, S., Busi, I., and E. L. Rouzic, "A YANG Data Model for Layer 0 Types", Work in Progress, Internet- Draft, draft-ietf-ccamp-rfc9093-bis-01, 11 July 2022, . [I-D.ietf-teas-yang-path-computation] Busi, I., Belotti, S., Dios, O. G. D., Sharma, A., and D. Ceccarelli, "A YANG Data Model for requesting path computation", Work in Progress, Internet-Draft, draft- ietf-teas-yang-path-computation-18, 22 March 2022, . [I-D.ietf-teas-yang-te] Saad, T., Gandhi, R., Liu, X., Beeram, V. P., Bryskin, I., and O. G. D. Dios, "A YANG Data Model for Traffic Engineering Tunnels, Label Switched Paths and Interfaces", Work in Progress, Internet-Draft, draft-ietf-teas-yang-te- 30, 11 July 2022, . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [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, . Busi, et al. Expires 16 March 2023 [Page 32] Internet-Draft Yang for Optical Path Computation September 2022 [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, . [RFC7699] Farrel, A., King, D., Li, Y., and F. Zhang, "Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers", RFC 7699, DOI 10.17487/RFC7699, November 2015, . [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, . [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.ietf-ccamp-flexigrid-tunnel-yang] Mendez, J. E. L. D. V., Burrero, D. P., King, D., Lopez, V., Busi, I., Belotti, S., and G. Galimberti, "A YANG Data Model for Flexi-Grid Tunnels", Work in Progress, Internet- Draft, draft-ietf-ccamp-flexigrid-tunnel-yang-01, 11 July 2022, . [I-D.ietf-ccamp-wson-tunnel-model] Lee, Y., Zheng, H., Guo, A., Lopez, V., King, D., Yoon, B. Y., and R. Vilalta, "A Yang Data Model for WSON Tunnel", Work in Progress, Internet-Draft, draft-ietf-ccamp-wson- tunnel-model-07, 11 July 2022, . Busi, et al. Expires 16 March 2023 [Page 33] Internet-Draft Yang for Optical Path Computation September 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-07, 10 July 2022, . [RFC7446] Lee, Y., Ed., Bernstein, G., Ed., Li, D., and W. Imajuku, "Routing and Wavelength Assignment Information Model for Wavelength Switched Optical Networks", RFC 7446, DOI 10.17487/RFC7446, February 2015, . [RFC7581] Bernstein, G., Ed., Lee, Y., Ed., Li, D., Imajuku, W., and J. Han, "Routing and Wavelength Assignment Information Encoding for Wavelength Switched Optical Networks", RFC 7581, DOI 10.17487/RFC7581, June 2015, . 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. The authors of this document would also like to thank Young Lee, Haomian Zheng, Victor Lopex, Ricard Vilalta, Bin Yeong Yoon, Jorge E. Lopez de Vergara Mendez, Daniel Perdices Burrero, Oscar Gonzalez de Dios, Gabriele Galimberti, Zafar Ali, Daniel Michaud Vallinoto and Dhruv Dhody who have contributed to the development of path computation augmentations for WSON and Flexi-grid topology in earlier versions of [I-D.ietf-ccamp-wson-tunnel-model] and of [I-D.ietf-ccamp-flexigrid-tunnel-yang]. This document was prepared using kramdown. Contributors Daniel King Old Dog Consulting Email: daniel@olddog.co.uk Authors' Addresses Busi, et al. Expires 16 March 2023 [Page 34] Internet-Draft Yang for Optical Path Computation September 2022 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 16 March 2023 [Page 35]