CCAMP Working Group I. Busi Internet-Draft Huawei Technologies Intended status: Standards Track A. Guo Expires: 2 September 2024 Futurewei Technologies S. Belotti Nokia 1 March 2024 YANG Data Models for requesting Path Computation in WDM Optical Networks draft-ietf-ccamp-optical-path-computation-yang-03 Abstract This document provides a mechanism to request path computation in Wavelength-Division Multiplexing (WDM) optical networks composed of Wavelength Switched Optical Networks (WSON) and Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) switched technologies. This model augments 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 2 September 2024. Copyright Notice Copyright (c) 2024 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. Busi, et al. Expires 2 September 2024 [Page 1] Internet-Draft Yang for WDM Path Computation March 2024 Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 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 WDM 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. WDM Path Computation Tree Diagrams . . . . . . . . . . . . . 5 4. YANG Models for WDM Path Computation . . . . . . . . . . . . 16 5. Manageability Considerations . . . . . . . . . . . . . . . . 26 6. Security Considerations . . . . . . . . . . . . . . . . . . . 27 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 27 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 27 8.1. Normative References . . . . . . . . . . . . . . . . . . 27 8.2. Informative References . . . . . . . . . . . . . . . . . 29 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 30 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 30 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 31 1. Introduction [I-D.ietf-teas-yang-path-computation] describes key use cases, where a client needs to request underlying Software-Defined Network (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 2 September 2024 [Page 2] Internet-Draft Yang for WDM Path Computation March 2024 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 2 September 2024 [Page 3] Internet-Draft Yang for WDM Path Computation March 2024 +==========+===========================+===========+ | Prefix | YANG module | Reference | +==========+===========================+===========+ | l0-types | ietf-layer0-types | [RFCZZZZ] | +----------+---------------------------+-----------+ | te | ietf-te | [RFCKKKK] | +----------+---------------------------+-----------+ | tepc | ietf-te-path-computation | [RFCYYYY] | +----------+---------------------------+-----------+ | wdm-pc | ietf-wdm-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 WDM Path Computation 2.1. YANG Models Overview The YANG data models for requesting WDM 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 | | | +---------------------------+ | ietf-wdm-path-computation | +---------------------------+ Figure 1: Relationship between WDM and TE path computation models Busi, et al. Expires 2 September 2024 [Page 4] Internet-Draft Yang for WDM Path Computation March 2024 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 WDM 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) path computation are under definition in [I-D.ietf-ccamp-rfc9093-bis] and re-used in the ietf-wdm-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. WDM Path Computation Tree Diagrams Figure 2 below shows the tree diagram of the YANG data model defined in module ietf-wdm-path-computation.yang. Busi, et al. Expires 2 September 2024 [Page 5] Internet-Draft Yang for WDM Path Computation March 2024 module: ietf-wdm-path-computation augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:tunnel-attributes: +-- wdm-constraint +-- transceiver-constraint | +-- operational-modes* string | +-- tx-tune-constraints | | +-- min-central-frequency? frequency-thz | | +-- max-central-frequency? frequency-thz | | +-- transceiver-tunability? frequency-ghz | +-- line-coding-bitrate* identityref | +-- tx-channel-power? l0-types:power-dbm | +-- preferred-rx-channel-power? l0-types:power-dbm +-- gsnr-extra-margin? snr +-- use-regen? boolean +-- wavelength-conversion? boolean +-- wavelength-assignment? identityref +-- guard-band-size? l0-types:frequency-thz +-- matching-fwd-rev-wavelength? boolean +-- allow-retuning? boolean +-- delta-power? l0-types:power-ratio 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:numbered-node-hop: +-- path-in-transceiver | +-- transponder-id? uint32 | +-- transceivers* [lane-id] | +-- lane-id uint8 | +-- transceiver-id? uint32 | +-- operational-modes* string | +-- tx-tune-constraints | | +-- min-central-frequency? frequency-thz | | +-- max-central-frequency? frequency-thz | | +-- transceiver-tunability? frequency-ghz | +-- line-coding-bitrate* identityref | +-- tx-channel-power? l0-types:power-dbm | +-- preferred-rx-channel-power? l0-types:power-dbm +-- path-out-transceiver +-- transponder-id? uint32 +-- transceivers* [lane-id] +-- lane-id uint8 +-- transceiver-id? uint32 +-- operational-modes* string +-- tx-tune-constraints Busi, et al. Expires 2 September 2024 [Page 6] Internet-Draft Yang for WDM Path Computation March 2024 | +-- min-central-frequency? frequency-thz | +-- max-central-frequency? frequency-thz | +-- transceiver-tunability? frequency-ghz +-- line-coding-bitrate* identityref +-- tx-channel-power? l0-types:power-dbm +-- preferred-rx-channel-power? l0-types:power-dbm 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 /tepc:numbered-node-hop: +-- path-in-transceiver | +-- transponder-id? uint32 | +-- transceivers* [lane-id] | +-- lane-id uint8 | +-- transceiver-id? uint32 | +-- operational-modes* string | +-- tx-tune-constraints | | +-- min-central-frequency? frequency-thz | | +-- max-central-frequency? frequency-thz | | +-- transceiver-tunability? frequency-ghz | +-- line-coding-bitrate* identityref | +-- tx-channel-power? l0-types:power-dbm | +-- preferred-rx-channel-power? l0-types:power-dbm +-- path-out-transceiver +-- transponder-id? uint32 +-- transceivers* [lane-id] +-- lane-id uint8 +-- transceiver-id? uint32 +-- operational-modes* string +-- tx-tune-constraints | +-- min-central-frequency? frequency-thz | +-- max-central-frequency? frequency-thz | +-- transceiver-tunability? frequency-ghz +-- line-coding-bitrate* identityref +-- tx-channel-power? l0-types:power-dbm +-- preferred-rx-channel-power? l0-types:power-dbm 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 2 September 2024 [Page 7] Internet-Draft Yang for WDM Path Computation March 2024 /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 /tepc:route-object-exclude-always/tepc:type /tepc:numbered-node-hop: +-- path-in-transceiver | +-- transponder-id? uint32 | +-- transceivers* [lane-id] | +-- lane-id uint8 | +-- transceiver-id? uint32 | +-- operational-modes* string | +-- tx-tune-constraints | | +-- min-central-frequency? frequency-thz | | +-- max-central-frequency? frequency-thz | | +-- transceiver-tunability? frequency-ghz | +-- line-coding-bitrate* identityref | +-- tx-channel-power? l0-types:power-dbm | +-- preferred-rx-channel-power? l0-types:power-dbm +-- path-out-transceiver +-- transponder-id? uint32 +-- transceivers* [lane-id] +-- lane-id uint8 +-- transceiver-id? uint32 +-- operational-modes* string +-- tx-tune-constraints | +-- min-central-frequency? frequency-thz | +-- max-central-frequency? frequency-thz | +-- transceiver-tunability? frequency-ghz +-- line-coding-bitrate* identityref +-- tx-channel-power? l0-types:power-dbm +-- preferred-rx-channel-power? l0-types:power-dbm augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:explicit-route-objects /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 /tepc:route-object-include-exclude/tepc:type /tepc:numbered-node-hop: +-- path-in-transceiver | +-- transponder-id? uint32 | +-- transceivers* [lane-id] | +-- lane-id uint8 | +-- transceiver-id? uint32 Busi, et al. Expires 2 September 2024 [Page 8] Internet-Draft Yang for WDM Path Computation March 2024 | +-- operational-modes* string | +-- tx-tune-constraints | | +-- min-central-frequency? frequency-thz | | +-- max-central-frequency? frequency-thz | | +-- transceiver-tunability? frequency-ghz | +-- line-coding-bitrate* identityref | +-- tx-channel-power? l0-types:power-dbm | +-- preferred-rx-channel-power? l0-types:power-dbm +-- path-out-transceiver +-- transponder-id? uint32 +-- transceivers* [lane-id] +-- lane-id uint8 +-- transceiver-id? uint32 +-- operational-modes* string +-- tx-tune-constraints | +-- min-central-frequency? frequency-thz | +-- max-central-frequency? frequency-thz | +-- transceiver-tunability? frequency-ghz +-- line-coding-bitrate* identityref +-- tx-channel-power? l0-types:power-dbm +-- preferred-rx-channel-power? l0-types:power-dbm augment /te:tunnels-path-compute/te:input/te:path-compute-info /tepc:path-request/tepc:explicit-route-objects /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/tepc:numbered-node-hop: +-- path-in-transceiver | +-- transponder-id? uint32 | +-- transceivers* [lane-id] | +-- lane-id uint8 | +-- transceiver-id? uint32 | +-- operational-modes* string | +-- tx-tune-constraints | | +-- min-central-frequency? frequency-thz | | +-- max-central-frequency? frequency-thz | | +-- transceiver-tunability? frequency-ghz | +-- line-coding-bitrate* identityref | +-- tx-channel-power? l0-types:power-dbm | +-- preferred-rx-channel-power? l0-types:power-dbm +-- path-out-transceiver +-- transponder-id? uint32 +-- transceivers* [lane-id] +-- lane-id uint8 +-- transceiver-id? uint32 +-- operational-modes* string Busi, et al. Expires 2 September 2024 [Page 9] Internet-Draft Yang for WDM Path Computation March 2024 +-- tx-tune-constraints | +-- min-central-frequency? frequency-thz | +-- max-central-frequency? frequency-thz | +-- transceiver-tunability? frequency-ghz +-- line-coding-bitrate* identityref +-- tx-channel-power? l0-types:power-dbm +-- preferred-rx-channel-power? l0-types:power-dbm 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: +--ro estimated-gsnr? snr +--ro estimated-eol-gsnr? snr +--ro estimated-lowest-gsnr? 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 /tepc:path-route-objects/tepc:path-route-object/tepc:type /tepc:numbered-node-hop: +--ro path-in-transceiver | +--ro transponder-id? uint32 | +--ro transceivers* [lane-id] | +--ro lane-id uint8 | +--ro transceiver-id? uint32 | +--ro operational-modes* string | +--ro tx-tune-constraints | | +--ro min-central-frequency? frequency-thz | | +--ro max-central-frequency? frequency-thz | | +--ro transceiver-tunability? frequency-ghz | +--ro line-coding-bitrate* identityref | +--ro tx-channel-power? l0-types:power-dbm | +--ro preferred-rx-channel-power? l0-types:power-dbm +--ro path-out-transceiver +--ro transponder-id? uint32 +--ro transceivers* [lane-id] +--ro lane-id uint8 +--ro transceiver-id? uint32 +--ro operational-modes* string +--ro tx-tune-constraints | +--ro min-central-frequency? frequency-thz | +--ro max-central-frequency? frequency-thz | +--ro transceiver-tunability? frequency-ghz +--ro line-coding-bitrate* identityref +--ro tx-channel-power? l0-types:power-dbm Busi, et al. Expires 2 September 2024 [Page 10] Internet-Draft Yang for WDM Path Computation March 2024 +--ro preferred-rx-channel-power? l0-types:power-dbm 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: +--:(wdm) +-- (grid-type)? +--:(fixed-dwdm) | +-- (fixed-single-or-super-channel)? | +--:(single) | | +-- dwdm-n? l0-types:dwdm-n | +--:(multi) | +-- subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) | +-- cwdm-n? l0-types:cwdm-n +--:(flexi-grid) +-- (single-or-super-channel)? +--:(single) | +-- flexi-n? l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m x--:(super) Busi, et al. Expires 2 September 2024 [Page 11] Internet-Draft Yang for WDM Path Computation March 2024 | x-- subcarrier-flexi-n* [flexi-n] | +-- flexi-n l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m +--:(multi) +-- frequency-slots +-- frequency-slot* [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: +--:(wdm) +-- (grid-type)? +--:(fixed-dwdm) | +-- (fixed-single-or-super-channel)? | +--:(single) | | +-- dwdm-n? l0-types:dwdm-n | +--:(multi) | +-- subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) | +-- cwdm-n? l0-types:cwdm-n +--:(flexi-grid) +-- (single-or-super-channel)? +--:(single) | +-- flexi-n? l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m x--:(super) | x-- subcarrier-flexi-n* [flexi-n] | +-- flexi-n l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m +--:(multi) +-- frequency-slots +-- frequency-slot* [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 /tepc:route-object-exclude-always/tepc:type/tepc:label /tepc:label-hop/tepc:te-label/tepc:technology: +--:(wdm) +-- (grid-type)? +--:(fixed-dwdm) | +-- (fixed-single-or-super-channel)? | +--:(single) | | +-- dwdm-n? l0-types:dwdm-n Busi, et al. Expires 2 September 2024 [Page 12] Internet-Draft Yang for WDM Path Computation March 2024 | +--:(multi) | +-- subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) | +-- cwdm-n? l0-types:cwdm-n +--:(flexi-grid) +-- (single-or-super-channel)? +--:(single) | +-- flexi-n? l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m x--:(super) | x-- subcarrier-flexi-n* [flexi-n] | +-- flexi-n l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m +--:(multi) +-- frequency-slots +-- frequency-slot* [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 /tepc:route-object-include-exclude/tepc:type/tepc:label /tepc:label-hop/tepc:te-label/tepc:technology: +--:(wdm) +-- (grid-type)? +--:(fixed-dwdm) | +-- (fixed-single-or-super-channel)? | +--:(single) | | +-- dwdm-n? l0-types:dwdm-n | +--:(multi) | +-- subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) | +-- cwdm-n? l0-types:cwdm-n +--:(flexi-grid) +-- (single-or-super-channel)? +--:(single) | +-- flexi-n? l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m x--:(super) | x-- subcarrier-flexi-n* [flexi-n] | +-- flexi-n l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m +--:(multi) +-- frequency-slots +-- frequency-slot* [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:path-in-segment Busi, et al. Expires 2 September 2024 [Page 13] Internet-Draft Yang for WDM Path Computation March 2024 /tepc:label-restrictions/tepc:label-restriction /tepc:label-start/tepc:te-label/tepc:technology: +--:(wdm) +-- (grid-type)? +--:(fixed-dwdm) | +-- dwdm-n? l0-types:dwdm-n +--:(cwdm) | +-- cwdm-n? l0-types:cwdm-n +--:(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: +--:(wdm) +-- (grid-type)? +--:(fixed-dwdm) | +-- dwdm-n? l0-types:dwdm-n +--:(cwdm) | +-- cwdm-n? l0-types:cwdm-n +--:(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: +--:(wdm) +-- (l0-grid-type)? +--:(fixed-dwdm) | +-- wson-dwdm-channel-spacing? identityref +--:(cwdm) | +-- wson-cwdm-channel-spacing? identityref +--:(flexi-grid) x-- flexi-grid-channel-spacing? identityref +-- flexi-ncfg? 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: +--:(wdm) +-- (grid-type)? +--:(fixed-dwdm) | +-- dwdm-n? l0-types:dwdm-n +--:(cwdm) | +-- cwdm-n? l0-types:cwdm-n +--:(flexi-grid) +-- flexi-n? l0-types:flexi-n Busi, et al. Expires 2 September 2024 [Page 14] Internet-Draft Yang for WDM Path Computation March 2024 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: +--:(wdm) +-- (grid-type)? +--:(fixed-dwdm) | +-- dwdm-n? l0-types:dwdm-n +--:(cwdm) | +-- cwdm-n? l0-types:cwdm-n +--:(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: +--:(wdm) +-- (l0-grid-type)? +--:(fixed-dwdm) | +-- wson-dwdm-channel-spacing? identityref +--:(cwdm) | +-- wson-cwdm-channel-spacing? identityref +--:(flexi-grid) x-- flexi-grid-channel-spacing? identityref +-- flexi-ncfg? 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: +--:(wdm) +-- (grid-type)? +--:(fixed-dwdm) | +-- (fixed-single-or-super-channel)? | +--:(single) | | +-- dwdm-n? l0-types:dwdm-n | +--:(multi) | +-- subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) | +-- cwdm-n? l0-types:cwdm-n +--:(flexi-grid) +-- (single-or-super-channel)? +--:(single) | +-- flexi-n? l0-types:flexi-n | +-- flexi-m? l0-types:flexi-m x--:(super) | x-- subcarrier-flexi-n* [flexi-n] | +-- flexi-n l0-types:flexi-n Busi, et al. Expires 2 September 2024 [Page 15] Internet-Draft Yang for WDM Path Computation March 2024 | +-- flexi-m? l0-types:flexi-m +--:(multi) +-- frequency-slots +-- frequency-slot* [flexi-n] +-- 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: +--:(wdm) +--ro (grid-type)? +--:(fixed-dwdm) | +--ro (fixed-single-or-super-channel)? | +--:(single) | | +--ro dwdm-n? l0-types:dwdm-n | +--:(multi) | +--ro subcarrier-dwdm-n* l0-types:dwdm-n +--:(cwdm) | +--ro cwdm-n? l0-types:cwdm-n +--:(flexi-grid) +--ro (single-or-super-channel)? +--:(single) | +--ro flexi-n? l0-types:flexi-n | +--ro flexi-m? l0-types:flexi-m x--:(super) | x--ro subcarrier-flexi-n* [flexi-n] | +--ro flexi-n l0-types:flexi-n | +--ro flexi-m? l0-types:flexi-m +--:(multi) +--ro frequency-slots +--ro frequency-slot* [flexi-n] +--ro flexi-n l0-types:flexi-n +--ro flexi-m? l0-types:flexi-m Figure 2: WDM path computation tree diagram 4. YANG Models for WDM Path Computation file "ietf-wdm-path-computation@2024-02-29.yang" module ietf-wdm-path-computation { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-wdm-path-computation"; prefix "wdm-pc"; import ietf-te-path-computation { Busi, et al. Expires 2 September 2024 [Page 16] Internet-Draft Yang for WDM Path Computation March 2024 prefix "tepc"; reference "I-D.ietf-teas-yang-path-computation-22: Yang model for requesting Path Computation."; } import ietf-te { prefix "te"; reference "I-D.ietf-teas-yang-te-36: 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."; } import ietf-wdm-tunnel { prefix "wdm-tnl"; reference "I-D.ietf-wdm-tunnel: A YANG Data Model for WDM Tunnels."; } 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 WDM Path Computation. The model fully conforms to the Network Management Datastore Architecture (NMDA). Busi, et al. Expires 2 September 2024 [Page 17] Internet-Draft Yang for WDM Path Computation March 2024 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 "2024-02-29" { 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 tunnel attributes */ augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:tunnel-attributes" { description "Augment with WDM tunnel-specific constraints."; uses wdm-tnl:wdm-constraint; } /* * Augment path computation request */ 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:numbered-node-hop" { Busi, et al. Expires 2 September 2024 [Page 18] Internet-Draft Yang for WDM Path Computation March 2024 description "Augment with transceiver configurations."; uses wdm-tnl:path-transceiver-config; } //??? 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/" + "tepc:explicit-route-include-objects/" + "tepc:route-object-include-object/tepc:type/" + "tepc:numbered-node-hop" { description "Augment with transceiver configurations."; uses wdm-tnl:path-transceiver-config; } //??? 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 Busi, et al. Expires 2 September 2024 [Page 19] Internet-Draft Yang for WDM Path Computation March 2024 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/" + "tepc:route-object-exclude-always/tepc:type/" + "tepc:numbered-node-hop" { description "Augment with transceiver configurations."; uses wdm-tnl:path-transceiver-config; } //??? augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects/" + "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/" + "tepc:route-object-include-exclude/tepc:type/" + "tepc:numbered-node-hop" { description "Augment with transceiver configurations."; uses wdm-tnl:path-transceiver-config; Busi, et al. Expires 2 September 2024 [Page 20] Internet-Draft Yang for WDM Path Computation March 2024 } //??? augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects/" + "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/tepc:numbered-node-hop" { description "Augment with transceiver configurations."; uses wdm-tnl:path-transceiver-config; } //??? 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"; } } /* Busi, et al. Expires 2 September 2024 [Page 21] Internet-Draft Yang for WDM Path Computation March 2024 * Augment path computation response */ 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 WDM paths."; uses l0-types:l0-path-properties; } 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:numbered-node-hop" { description "Augment with transceiver configurations."; uses wdm-tnl:path-transceiver-config; } //??? 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"; } } /* Busi, et al. Expires 2 September 2024 [Page 22] Internet-Draft Yang for WDM Path Computation March 2024 * 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:wdm-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:wdm-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 wdm { uses l0-types:wdm-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 Busi, et al. Expires 2 September 2024 [Page 23] Internet-Draft Yang for WDM Path Computation March 2024 route objects included by the path computation of the requested path."; case wdm { uses l0-types:wdm-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects/" + "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 wdm { uses l0-types:wdm-label-hop; } } augment "/te:tunnels-path-compute/te:input/te:path-compute-info/" + "tepc:path-request/tepc:explicit-route-objects/" + "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 wdm { uses l0-types:wdm-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 wdm { uses l0-types:wdm-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 Busi, et al. Expires 2 September 2024 [Page 24] Internet-Draft Yang for WDM Path Computation March 2024 "Augment TE label range end for the ingress segment of the requested path."; case wdm { uses l0-types:wdm-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 wdm { uses l0-types:wdm-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 wdm { uses l0-types:wdm-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 wdm { uses l0-types:wdm-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 Busi, et al. Expires 2 September 2024 [Page 25] Internet-Draft Yang for WDM Path Computation March 2024 "Augment TE label range end for the egress segment of the requested path."; case wdm { uses l0-types:wdm-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 wdm { uses l0-types:wdm-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 wdm { uses l0-types:wdm-label-hop; } } } Figure 3: WDM path computation YANG module 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. Busi, et al. Expires 2 September 2024 [Page 26] Internet-Draft Yang for WDM Path Computation March 2024 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-wdm-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-wdm-path-computation namespace: urn:ietf:params:xml:ns:yang:ietf-wson-path-computation prefix: wdm-pc reference: this document 8. References 8.1. Normative References Busi, et al. Expires 2 September 2024 [Page 27] Internet-Draft Yang for WDM Path Computation March 2024 [I-D.ietf-ccamp-rfc9093-bis] Belotti, S., Busi, I., Beller, D., Zheng, H., Le Rouzic, E., Guo, A., and D. King, "A YANG Data Model for Layer 0 Types", Work in Progress, Internet-Draft, draft-ietf- ccamp-rfc9093-bis-08, 1 February 2024, . [I-D.ietf-teas-yang-path-computation] Busi, I., Belotti, S., de Dios, O. G., Sharma, A., and Y. Shi, "A YANG Data Model for requesting path computation", Work in Progress, Internet-Draft, draft-ietf-teas-yang- path-computation-22, 14 February 2024, . [I-D.ietf-teas-yang-te] Saad, T., Gandhi, R., Liu, X., Beeram, V. P., and I. Bryskin, "A YANG Data Model for Traffic Engineering Tunnels, Label Switched Paths and Interfaces", Work in Progress, Internet-Draft, draft-ietf-teas-yang-te-36, 2 February 2024, . [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, . [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, . Busi, et al. Expires 2 September 2024 [Page 28] Internet-Draft Yang for WDM Path Computation March 2024 [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.draft-gbb-ccamp-otn-path-computation-yang] Busi, I., Guo, A., and S. Belotti, "A YANG Data Model for requesting Path Computation in an Optical Transport Network (OTN)", Work in Progress, Internet-Draft, draft- gbb-ccamp-otn-path-computation-yang-02, 12 September 2022, . [I-D.ietf-ccamp-flexigrid-tunnel-yang] de Madrid, U. A., 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-03, 10 July 2023, . [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-09, 9 July 2023, . [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, Busi, et al. Expires 2 September 2024 [Page 29] Internet-Draft Yang for WDM Path Computation March 2024 draft-ietf-teas-actn-poi-applicability-11, 22 February 2024, . [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, . 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 this document, and the OTN capabilities were moved into [I-D.draft-gbb-ccamp-otn-path-computation-yang]. 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. 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. Busi, et al. Expires 2 September 2024 [Page 30] Internet-Draft Yang for WDM Path Computation March 2024 Contributors Daniel King Old Dog Consulting Email: daniel@olddog.co.uk Authors' Addresses 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 2 September 2024 [Page 31]