CCAMP Working Group Y. Lee Internet Draft H. Zheng Intended status: Standard Track Huawei Expires: April 23, 2019 N. Sambo Scuola Superiore Sant'Anna V. Lopez Telefonica G. Galimberti Cisco October 22, 2018 A Yang Data Model for Optical Impairment-aware Topology draft-lee-ccamp-optical-impairment-topology-yang-00 Abstract This document provides a YANG data model for the impairment-aware TE topology in optical networks. Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on April 23, 2019. Copyright Notice Lee, et al. Expires April 2019 [Page 1] Internet-Draft Optical Impairment-Aware YANG Model October 2018 Copyright (c) 2018 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 (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction...................................................2 1.1. Terminology...............................................3 1.2. Tree diagram..............................................4 1.3. Prefixes in Data Node Names...............................4 2. YANG Model (Tree Structure)....................................4 3. Optical Impairment Topology YANG Model.........................6 4. Security Considerations.......................................18 5. IANA Considerations...........................................19 6. Acknowledgments...............................................19 7. References....................................................20 7.1. Normative References.....................................20 7.2. Informative References...................................20 8. Contributors..................................................21 Authors' Addresses...............................................21 1. Introduction In order to provision an optical connection (an optical path) through a wavelength switched optical networks (WSONs) or spectrum switched optical networks (SSONs), a combination of path continuity, resource availability, and impairment constraints must be met to determine viable and optimal paths through the network. The determination of appropriate paths is known as Impairment-Aware Routing and Wavelength Assignment (IA-RWA) [RFC6566] for WSON, while it is known as IA-Routing and Spectrum Assigment (IA-RSA) for SSON. Lee, et al. Expires April 2019 [Page 2] Internet-Draft Optical Impairment-Aware YANG Model October 2018 This document provides a YANG data model for the impairment-aware Traffic Engineering (TE) topology in WSONs and SSONs. The YANG model described in this document is a WSON/SSON technology-specific Yang model based on the information model developed in [RFC7446] and the two encoding documents [RFC7581] and [RFC7579] that developed protocol independent encodings based on [RFC7446]. The intent of this document is to provide a Yang data model, which can be utilized by an Multi Domain Service Coordinator (MDSC) to collect states of WSON impairment data from the Transport PNCs to enable impairment-aware optical path computation according to the ACTN Architecture [RFC8453]. The communication between controllers is done via a NETCONF [RFC8341]. Similarly, this model can also be exported by the MDSC to a Customer Network Controller (CNC), which can run an offline planning process to map latter the services in the network. This document augments the generic TE topology draft [TE-TOPO] where possible. This document defines one YANG module: ietf-optical-impairment- topology (Section 3) according to the new Network Management Datastore Architecture [RFC8342]. 1.1. Terminology Refer to [RFC4847] and [RFC5253] for the key terms used in this document. The following terms are defined in [RFC7950] and are not redefined here: o client o server o augment o data model o data node The following terms are defined in [RFC6241] and are not redefined here: o configuration data Lee, et al. Expires April 2019 [Page 3] Internet-Draft Optical Impairment-Aware YANG Model October 2018 o 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 2 of this this document. The meaning of the symbols in these diagrams is defined in [RFC8340]. 1.3. Prefixes in Data Node Names In this document, names of data nodes and other data model objects are prefixed using the standard prefix associated with the corresponding YANG imported modules, as shown in Table 1. +------------------+----------------------------------+------------+ | Prefix | YANG module | Reference | +------------------+----------------------------------+------------+ | optical-imp-topo | ietf-optical-impairment-topology | [RFC XXXX] | | layer0-types | ietf-layer0-types | [WSON-topo]| | nw | ietf-network | [RFC8345] | | nt | ietf-network-topology | [RFC8345] | | tet | ietf-te-topology | [TE-TOPO] | +------------------+----------------------------------+------------+ Table 1: Prefixes and corresponding YANG modules Note: The RFC Editor will replace XXXX with the number assigned to the RFC once this draft becomes an RFC. 2. YANG Model (Tree Structure) module: ietf-optical-impairment-topology augment /nw:networks/nw:network/nw:network-types/tet:te-topology: +--rw optical-impairment-topology! augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes: +--ro fiber-type? fiber-type +--ro power? int32 +--ro pmd? decimal64 +--ro cd? decimal64 +--ro osnr? decimal64 Lee, et al. Expires April 2019 [Page 4] Internet-Draft Optical Impairment-Aware YANG Model October 2018 augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link- attributes/tet:underlay/tet:primary-path/tet:path- element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology: +--:(optical-imp-topo) +--rw (grid-type)? | +--:(flexi-grid) | | +--ro central-channel-freq? decimal64 | | +--ro slot-width? decimal64 | +--:(dwdm) | | +--ro channel-freq? decimal64 | +--:(cwdm) | +--ro channel-wavelength? uint32 +--ro bit-rate? decimal64 +--ro BER? decimal64 +--ro pmd? decimal64 +--ro cd? decimal64 +--ro osnr? decimal64 +--ro q-factor? decimal64 augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link- attributes/tet:underlay/tet:backup-path/tet:path- element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology: +--:(optical-imp-topo) +--rw (grid-type)? | +--:(flexi-grid) | | +--ro central-channel-freq? decimal64 | | +--ro slot-width? decimal64 | +--:(dwdm) | | +--ro channel-freq? decimal64 | +--:(cwdm) | +--ro channel-wavelength? uint32 +--ro bit-rate? decimal64 +--ro BER? decimal64 +--ro pmd? decimal64 +--ro cd? decimal64 +--ro osnr? decimal64 +--ro q-factor? decimal64 augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link- attributes/tet:underlay/tet:primary-path/tet:path- element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology: +--:(optical-imp-topo) +--rw (grid-type)? | +--:(flexi-grid) | | +--ro central-channel-freq? decimal64 | | +--ro slot-width? decimal64 | +--:(dwdm) | | +--ro channel-freq? decimal64 | +--:(cwdm) | +--ro channel-wavelength? uint32 +--ro bit-rate? decimal64 Lee, et al. Expires April 2019 [Page 5] Internet-Draft Optical Impairment-Aware YANG Model October 2018 +--ro BER? decimal64 +--ro pmd? decimal64 +--ro cd? decimal64 +--ro osnr? decimal64 +--ro q-factor? decimal64 augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link- attributes/tet:underlay/tet:backup-path/tet:path- element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology: +--:(optical-imp-topo) +--rw (grid-type)? | +--:(flexi-grid) | | +--ro central-channel-freq? decimal64 | | +--ro slot-width? decimal64 | +--:(dwdm) | | +--ro channel-freq? decimal64 | +--:(cwdm) | +--ro channel-wavelength? uint32 +--ro bit-rate? decimal64 +--ro BER? decimal64 +--ro pmd? decimal64 +--ro cd? decimal64 +--ro osnr? decimal64 +--ro q-factor? decimal64 augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-point: +--rw available-operational-mode* layer0-types:operational-mode +--rw operational-mode? layer0-types:operational-mode +--rw vendor-identifier? layer0-types:vendor-identifier +--rw transponder-id? uint32 +--ro available-modulation* identityref +--rw modulation-enabled? boolean +--rw modulation-type? identityref +--ro available-FEC* identityref +--rw FEC-enabled? boolean +--rw FEC-type? identityref +--ro FEC-code-rate? decimal64 +--rw FEC-threshold? decimal64 +--ro power? int32 +--ro power-min? int32 +--ro power-max? int32 augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-point: +--ro transponder-list* [carrier-id] +--ro carrier-id uint32 3. Optical Impairment Topology YANG Model file ietf-optical-impairment-topology@2018-10-22.yang module ietf-optical-impairment-topology { Lee, et al. Expires April 2019 [Page 6] Internet-Draft Optical Impairment-Aware YANG Model October 2018 yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-optical-impairment-topology"; prefix "optical-imp-topo"; import ietf-network { prefix "nw"; } import ietf-network-topology { prefix "nt"; } import ietf-te-topology { prefix "tet"; } import ietf-layer0-types { prefix "layer0-types"; } organization "IETF CCAMP Working Group"; contact "Editor: Young Lee Editor: Haomian Zheng Editor: Nicola Sambo Editor: Victor Lopez Editor: Gabriele Galimberti "; description "This module contains a collection of YANG definitions for impairment-aware optical networks. Copyright (c) 2018 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info)."; revision 2018-10-22 { description "version 0."; Lee, et al. Expires April 2019 [Page 7] Internet-Draft Optical Impairment-Aware YANG Model October 2018 reference "RFC XXX: A Yang Data Model for Impairment-aware Optical Networks "; } identity modulation { description "base identity for modulation type"; } identity QPSK { base modulation; description "QPSK (Quadrature Phase Shift Keying) modulation"; } identity DP_QPSK { base modulation; description "DP-QPSK (Dual Polarization Quadrature Phase Shift Keying) modulation"; } identity QAM8 { base modulation; description "8QAM (8-State Quadrature Amplitude Modulation) modulation"; } identity QAM16 { base modulation; description "QAM16 (Quadrature Amplitude Modulation)"; } identity DP_QAM8 { base modulation; description "DP-QAM8 (Dual Polarization Quadrature Amplitude Modulation)"; } identity DC_DP_QAM8 { base modulation; description "DC DP-QAM8 (Dual Polarization Quadrature Amplitude Modulation)"; } identity DP_QAM16 { base modulation; description "DP-QAM16 (Dual Polarization Quadrature Amplitude Modulation)"; } identity DC_DP_QAM16 { base modulation; description "DC DP-QAM16 (Dual Polarization Quadrature Amplitude Modulation)"; } Lee, et al. Expires April 2019 [Page 8] Internet-Draft Optical Impairment-Aware YANG Model October 2018 identity FEC { description "Enumeration that defines the type of Forward Error Correction"; } identity reed-solomon { base FEC; description "Reed-Solomon error correction"; } identity hamming-code { base FEC; description "Hamming Code error correction"; } identity golay { base FEC; description "Golay error correction"; } typedef fiber-type { type enumeration { enum G.652 { description "G.652 Standard Singlemode Fiber"; } enum G.654 { description "G.654 Cutoff Shifted Fiber"; } enum G.653 { description "G.653 Dispersion Shifted Fiber"; } enum G.655 { description "G.655 Non-Zero Dispersion Shifted Fiber"; } enum G.656 { description "G.656 Non-Zero Dispersion for Wideband Optical Transport"; } enum G.657 { description "G.657 Bend-Insensitive Fiber"; } } description "ITU-T based fiber-types"; } grouping optical-label { Lee, et al. Expires April 2019 [Page 9] Internet-Draft Optical Impairment-Aware YANG Model October 2018 description "Generic label for optical links and paths"; choice grid-type { description "Label for Flexigrid, DWDM or CWDM grid"; case flexi-grid { leaf central-channel-freq { type decimal64 { fraction-digits 5; } units THz; config false; description "The Flexi-grid central frequency in THz, e.g. 193.12500"; reference "RFC7698"; } leaf slot-width { type decimal64 { fraction-digits 5; } units GHz; config false; description "The Flexi-grid slot width in GHz, e.g. 50, 100, 150."; reference "RFC7698"; } } case dwdm { leaf channel-freq { type decimal64 { fraction-digits 5; } units THz; config false; description "The DWDM frequency in THz, e.g. 193.12500"; reference "RFC6205"; } } case cwdm { leaf channel-wavelength { type uint32; units nm; config false; description "The CWDM wavelength in nanometer, e.g. 1511"; Lee, et al. Expires April 2019 [Page 10] Internet-Draft Optical Impairment-Aware YANG Model October 2018 reference "RFC6205"; } } } } grouping transponder-attributes { description "Configuration of an optical transponder"; leaf-list available-modulation { type identityref { base modulation; } config false; description "List determining all the available modulations"; } leaf modulation-enabled { type boolean; description "Determines whether the modulation is enabled or not"; } leaf modulation-type { type identityref { base modulation; } description "Modulation type of the transponder"; } leaf-list available-FEC { type identityref { base FEC; } config false; description "List determining all the available FEC"; } leaf FEC-enabled { type boolean; description "Determines whether the FEC is enabled or not"; } leaf FEC-type { type identityref { base FEC; } description "FEC type of the transponder"; Lee, et al. Expires April 2019 [Page 11] Internet-Draft Optical Impairment-Aware YANG Model October 2018 } leaf FEC-code-rate { type decimal64 { fraction-digits 8; range "0..max"; } config false; description "FEC-code-rate"; } leaf FEC-threshold { type decimal64 { fraction-digits 8; range "0..max"; } description "Threshold on the BER, for which FEC is able to correct errors"; } leaf power { type int32; units "dBm"; config false; description "per channel power"; } leaf power-min { type int32; units "dBm"; config false; description "minimum power of the transponder"; } leaf power-max { type int32; units "dBm"; config false; description "maximum power of the transponder"; } } grouping sliceable-transponder-attributes { description "Configuration of a sliceable transponder."; list transponder-list { key "carrier-id"; config false; description "List of carriers"; leaf carrier-id { type uint32; config false; description "Identifier of the carrier"; } Lee, et al. Expires April 2019 [Page 12] Internet-Draft Optical Impairment-Aware YANG Model October 2018 } } /* grouping wson-node-attributes { description "WSON node attributes"; container wson-node { description "WSON node attrtibutes."; leaf node-type { type identityref { base te-wson-types:wson-node-type; } description "WSON node type."; } } } */ grouping optical-fiber-data { description "optical link (fiber) attributes with impairment data"; leaf fiber-type { type fiber-type; config false; description "fiber-type"; } leaf power { type int32; units "dBm"; config false; description "Total Input Power Level at the line port of the link"; } leaf pmd { type decimal64 { fraction-digits 8; range "0..max"; } units "ps/(km)^0.5"; config false; description "Polarization Mode Dispersion"; } leaf cd { type decimal64 { fraction-digits 5; } units "ps/nm/km"; config false; description "Cromatic Dispersion"; } Lee, et al. Expires April 2019 [Page 13] Internet-Draft Optical Impairment-Aware YANG Model October 2018 leaf osnr { type decimal64 { fraction-digits 5; } units "dB"; config false; description "osnr"; } /* leaf sigma { type decimal64 { fraction-digits 5; } units "dB"; config false; description "sigma in the Gausian Noise Model"; } */ } grouping optical-impairment-data { description "optical impairment data per channel/wavelength"; leaf bit-rate { type decimal64 { fraction-digits 8; range "0..max"; } units "Gbit/s"; config false; description "Gross bit rate"; } leaf BER { type decimal64 { fraction-digits 18; range "0..max"; } config false; description "BER"; } leaf pmd { type decimal64 { fraction-digits 8; range "0..max"; } units "ps/(km)^0.5"; config false; description "Polarization Mode Dispersion"; } leaf cd { type decimal64 { Lee, et al. Expires April 2019 [Page 14] Internet-Draft Optical Impairment-Aware YANG Model October 2018 fraction-digits 5; } units "ps/nm/km"; config false; description "Cromatic Dispersion"; } leaf osnr { type decimal64 { fraction-digits 5; } units "dB"; config false; description "osnr"; } leaf q-factor { type decimal64 { fraction-digits 5; } units "dB"; config false; description "q-factor"; } } grouping wson-ttp-attributes { description "WSON tunnel termination point (e.g.tranponder) attributes"; leaf-list available-operational-mode { type layer0-types:operational-mode; description "List of all vendor-specific supported mode identifiers"; } leaf operational-mode { type layer0-types:operational-mode; description "Vendor-specific mode identifier"; } leaf vendor-identifier { type layer0-types:vendor-identifier; description "vendor identifier that uses vendor-specific mode"; } } /* Data nodes */ augment "/nw:networks/nw:network/nw:network-types" + "/tet:te-topology" { description "optical-impairment topology augmented"; Lee, et al. Expires April 2019 [Page 15] Internet-Draft Optical Impairment-Aware YANG Model October 2018 container optical-impairment-topology { presence "indicates an impairment-aware topology of optical networks"; description "Container to identify impairment-aware topology type"; } } augment "/nw:networks/nw:network/nt:link/tet:te" + "/tet:te-link-attributes" { when "/nw:networks/nw:network/nw:network-types" +"/tet:te-topology/optical-imp-topo:optical-impairment-topology" { description "This augment is only valid for Optical Impairment."; } description "Optical Link augmentation for impairment data."; uses optical-fiber-data; } /* Augment label hop of underlay primary path of TE link */ augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:underlay/tet:primary-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../" + "nw:network-types/tet:te-topology/" + "optical-imp-topo:optical-impairment-topology" { description "Augment optical TE label"; } description "optical label."; case optical-imp-topo { uses optical-label; uses optical-impairment-data; } } /* Augment label hop of underlay backup path of TE link */ augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:underlay/tet:backup-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../" + "nw:network-types/tet:te-topology/" + "optical-imp-topo:optical-impairment-topology" { description "Augment optical TE label"; } description "optical label."; case optical-imp-topo { uses optical-label; uses optical-impairment-data; Lee, et al. Expires April 2019 [Page 16] Internet-Draft Optical Impairment-Aware YANG Model October 2018 } } /* Augment label hop of underlay primary path of TE link template */ augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:underlay/tet:primary-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { /* when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "optical-imp-topo:optical-impairment-topology" { description "Augment Optical TE label"; } */ description "optical label."; case optical-imp-topo { uses optical-label; uses optical-impairment-data; } } /* Augment label hop of underlay backup path of TE link template */ augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:underlay/tet:backup-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { /* when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "optical-imp-topo:optical-impairment-topology" { description "Augment Optical TE label"; } */ description "optical label."; case optical-imp-topo { uses optical-label; uses optical-impairment-data; } } /* augment "/nw:networks/nw:network/nw:node/tet:te" + "/tet:te-node-attributes" { when "/nw:networks/nw:network/nw:network-types" +"/tet:te-topology/optical-imp-topo:optical-impairment-topology" { description "This augment is only valid for WSON."; Lee, et al. Expires April 2019 [Page 17] Internet-Draft Optical Impairment-Aware YANG Model October 2018 } description "WSON Node augmentation."; uses wson-node-attributes; } */ augment "/nw:networks/nw:network/nw:node/tet:te" + "/tet:tunnel-termination-point" { when "/nw:networks/nw:network/nw:network-types" +"/tet:te-topology/optical-imp-topo:optical-impairment-topology" { description "This augment is only valid for Impairment with non-sliceable transponder model"; } description "Tunnel termination point augmentation for non-sliceable transponder model."; uses wson-ttp-attributes; leaf transponder-id { type uint32; description "transponder identifier"; } uses transponder-attributes; } augment "/nw:networks/nw:network/nw:node/tet:te" + "/tet:tunnel-termination-point" { when "/nw:networks/nw:network/nw:network-types" +"/tet:te-topology/optical-imp-topo:optical-impairment-topology" { description "This augment is only valid for optical impairment with sliceable transponder model"; } description "Tunnel termination point augmentation for sliceable transponder model."; uses sliceable-transponder-attributes; } } 4. Security Considerations The configuration, state, and action data defined in this document are designed to be accessed via a management protocol with a secure transport layer, such as NETCONF [RFC6241]. The NETCONF access Lee, et al. Expires April 2019 [Page 18] Internet-Draft Optical Impairment-Aware YANG Model October 2018 control model [RFC6536] provides the means to restrict access for particular NETCONF users to a preconfigured subset of all available NETCONF protocol operations and content. A number of configuration data nodes defined in this document are read-only; however, these data nodes may be considered sensitive or vulnerable in some network environments (TBD). 5. IANA Considerations This document registers the following namespace URIs in the IETF XML registry [RFC3688]: -------------------------------------------------------------------- URI: urn:ietf:params:xml:ns:yang:ietf-optical-impairment-topology Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. -------------------------------------------------------------------- This document registers the following YANG modules in the YANG Module Names registry [RFC7950]: -------------------------------------------------------------------- name: ietf-optical-impairment-topology namespace: urn:ietf:params:xml:ns:yang:ietf-optical-impairment- topology reference: RFC XXXX (TDB) -------------------------------------------------------------------- 6. Acknowledgments We thank Dieter Bella and Sergio Belotti for useful discussions and motivation for this work. Lee, et al. Expires April 2019 [Page 19] Internet-Draft Optical Impairment-Aware YANG Model October 2018 7. References 7.1. Normative References 7.2. Informative References [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, June 2011. [RFC6566] Y. Lee, G. Bernstein, D. Li, G. Martinelli, "A Framework for the Control of Wavelength Switched Optical Networks (WSONs) with Impairments", RFC 6566, March 2012. [RFC7446] Y. Lee, G. Bernstein, D. Li, W. Imajuku, "Routing and Wavelength Assignment Information Model for Wavelength Switched Optical Networks", RFC 7446, Feburary 2015. [RFC7579] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "General Network Element Constraint Encoding for GMPLS Controlled Networks", RFC 7579, June 2015. [RFC7581] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and Wavelength Assignment Information Encoding for Wavelength Switched Optical Networks", RFC 7581, June 2015. [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, August 2016. [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", RFC 8341, March 2018. [RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture (NMDA)", RFC 8342, March 2018. [RFC8345] A. Clemm, et al, "A YANG Data Model for Network Topologies", RFC 8345, March 2018. [TE-TOPO] X. Liu, et al., "YANG Data Model for TE Topologies", work in progress: draft-ietf-teas-yang-te-topo. Lee, et al. Expires April 2019 [Page 20] Internet-Draft Optical Impairment-Aware YANG Model October 2018 [RFC8453] Ceccarelli, D. and Y. Lee, "Framework for Abstraction and Control of Traffic Engineered Networks", RFC 8453, August 2018. [WSON-Topo] Y. Lee, Ed., "A Yang Data Model for WSON Optical Networks", draft-ietf-ccamp-wson-yang-13, work in progress. 8. Contributors Giovanni Martinelli Cisco Email: giomarti@cisco.com Jonas Martensson Acro Email: jonas.martensson@ri.se Gert Grammel Juniper Email: ggrammel@juniper.net Authors' Addresses Young Lee Huawei Technologies 5700 Tennyson Parkway, Suite 600 Plano, TX 75024 USA Phone: (469) 277-5838 Email: leeyoung@huawei.com Haomian Zheng Huawei Technologies Email: zhenghaomian@huawei.com Nicola Sambo Scuola Superiore Sant'Anna Lee, et al. Expires April 2019 [Page 21] Internet-Draft Optical Impairment-Aware YANG Model October 2018 Email: nicosambo@gmail.com Victor Lopez Telefonica Email: victor.lopezalvarez@telefonica.com G. Galimberti Cisco Email: ggalimbe@cisco.com Lee, et al. Expires April 2019 [Page 22]