CCAMP D. Beller, Ed. Internet-Draft S. Belotti, Ed. Updates: RFC9093 (if approved) Nokia Intended status: Standards Track H. Zheng Expires: 28 April 2022 I. Busi Huawei E. Le Rouzic Orange 25 October 2021 A YANG Data Model for Layer 0 Types - Revision 2 draft-ietf-ccamp-layer0-types-ext-01 Abstract This document defines a collection of common data types and groupings in the YANG data modeling language, which are used in several YANG modules for wavelength Division multiplexing (WDM) transport networks. The YANG module ietf-layer0-types-ext updates ietf- layer0-types defined in [RFC9093], which has been reduced in scope prior to publication to only cover spectrum management related aspects required for the YANG module ietf-wson-topology defined in [RFC9094]. To be completed 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 28 April 2022. Copyright Notice Copyright (c) 2021 IETF Trust and the persons identified as the document authors. All rights reserved. Beller, et al. Expires 28 April 2022 [Page 1] Internet-Draft Layer 0 Types - Revision 2 October 2021 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 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. Requirements Language . . . . . . . . . . . . . . . . . . 2 1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3 2. Extensions for the Layer 0 Types Module . . . . . . . . . . . 3 3. Layer0 Types Revision 2 YANG CODE . . . . . . . . . . . . . . 4 4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 24 5. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 24 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 24 7. Security Considerations . . . . . . . . . . . . . . . . . . . 25 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 25 8.1. Normative References . . . . . . . . . . . . . . . . . . 25 8.2. Informative References . . . . . . . . . . . . . . . . . 25 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 26 1. Introduction YANG [RFC7950] is a data modeling language used to model configuration data, state data, Remote Procedure Calls, and notifications for network management protocols such as NETCONF [RFC6241]. The YANG language supports a small set of built-in data types and provides mechanisms to derive other types from the built-in types. This document introduces a collection of common data types derived from the built-in YANG data types. The derived types and groupings are designed to be the common types applicable for modeling Traffic Engineering (TE) features as well as non-TE features (e.g., physical network configuration aspect) for Layer 0 optical networks in model(s) defined outside of this document. 1.1. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. Beller, et al. Expires 28 April 2022 [Page 2] Internet-Draft Layer 0 Types - Revision 2 October 2021 1.2. Terminology 2. Extensions for the Layer 0 Types Module This document defines YANG module extensions for common Layer 0 types. named ietf-layer0-types-ext. This module can be used for both WSON and Flexi-grid DWDM networks but in particular is adding common types used in the context of optical impairment aware topology model in WSON and SSONs. The ietf-layer0-types-ext module contains the following YANG identities, types and groupings that can be reused in other YANG modules: transceiver-capabilities: a YANG grouping to define the transceiver capabilities (also called "modes") needed to determine optical signal compatibility. standard-mode: a YANG grouping for ITU-T G.698.2 standard mode that guarantees interoperability. organizational-mode: a YANG grouping to define transponder operational mode supported by organizations or vendors. common-explicit-mode: a YANG grouping to define the list of attributes related to optical impairments limits in case of transceiver explicit mode. This grouping should be the same used in [I-D.ietf-ccamp-dwdm-if-param-yang]. common-organizational-explicit-mode: a YANG grouping to define the common capabilities attributes limit range in case of operational mode and explicit mode. Also this grouping should be used in [I-D.ietf-ccamp-dwdm-if-param-yang]. cd-pmd-penalty: a YANG grouping to define the triplet used as entries in the list optional penalty associated with a given accumulated CD and PMD. This list of triplet cd, pmd, penalty can be used to sample the function penalty = f(CD, PMD). Beller, et al. Expires 28 April 2022 [Page 3] Internet-Draft Layer 0 Types - Revision 2 October 2021 [Editor's note: There is still stuff from the xml template that needs to be removed] 3. Layer0 Types Revision 2 YANG CODE The YANG code is developed on GitHub and can also be found in the following CCAMP repository: https://github.com/ietf-ccamp-wg/ietf-ccamp-layer0-types-ext [Editor's note: YANG code below always has to be updated before submitting a new revision!] file "ietf-layer0-types-ext@2021-10-18.yang" module ietf-layer0-types-ext { namespace "urn:ietf:params:xml:ns:yang:ietf-layer0-types-ext"; prefix "l0-types-ext"; organization "IETF CCAMP Working Group"; contact "WG Web: WG List: Editor: Dieter Beller Editor: Sergio Belotti Editor: Italo Busi Editor: Haomian Zheng "; // Additional contacts TBA (contributors) description "Description to be added!!! Copyright (c) 2021 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 Beller, et al. Expires 28 April 2022 [Page 4] Internet-Draft Layer 0 Types - Revision 2 October 2021 Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision "2021-10-18" { description "Initial Version"; reference "RFC XXXX: A YANG Data Model for Layer 0 Types - Revision 2"; } /* * Identities */ 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; Beller, et al. Expires 28 April 2022 [Page 5] Internet-Draft Layer 0 Types - Revision 2 October 2021 description "DP-QAM8 (Dual Polarization Quadrature Amplitude Modulation)"; } identity DC-DP-QAM8 { base modulation; description "DC DP-QAM8 (Dual Carrier 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 Carrier Dual Polarization Quadrature Amplitude Modulation)"; } identity fec-type { description "Base identity from which specific FEC (Forward Error Correction) type identities are derived."; } identity g-fec { base fec-type; description "G-FEC (Generic-FEC)"; } identity e-fec { base fec-type; description "E-FEC (Enhanced-FEC)"; } identity no-fec { base fec-type; description "No FEC"; } identity reed-solomon { Beller, et al. Expires 28 April 2022 [Page 6] Internet-Draft Layer 0 Types - Revision 2 October 2021 base fec-type; description "Reed-Solomon error correction"; } identity hamming-code { base fec-type; description "Hamming Code error correction"; } identity golay { base fec-type; description "Golay error correction"; } identity line-coding { description "base line-coding class"; reference "ITU-T G.698.2-201811 section 7"; } identity line-coding-NRZ-2p5G { base line-coding; description "ITU-T G.698.2-201811 section 7 table 8-1"; } identity line-coding-NRZ-OTU1 { base line-coding; description "ITU-T G.698.2-201811 section 7 table 8-2"; } identity line-coding-NRZ-10G { base line-coding; description "ITU-T G.698.2-201811 section 7 table 8-3/8-5"; } identity line-coding-NRZ-OTU2 { base line-coding; description "ITU-T G.698.2-201811 section 7 table 8-4/8-6"; } identity wavelength-assignment { Beller, et al. Expires 28 April 2022 [Page 7] Internet-Draft Layer 0 Types - Revision 2 October 2021 description "Wavelength selection base"; reference "RFC6163:Framework for GMPLS and Path Computation Element (PCE) Control of Wavelength Switched Optical Networks (WSONs)"; } identity unspecified-wavelength-assignment { base wavelength-assignment; description "No method specified"; } identity first-fit-wavelength-assignment { base wavelength-assignment; description "All the available wavelengths are numbered, and this WA (Wavelength Assignment) method chooses the available wavelength with the lowest index"; } identity random-wavelength-assignment { base wavelength-assignment; description "This WA method chooses an available wavelength randomly"; } identity least-loaded-wavelength-assignment { base wavelength-assignment; description "This WA method selects the wavelength that has the largest residual capacity on the most loaded link along the route (in multi-fiber networks)"; } identity term-type { description "Termination type"; reference "ITU-T G.709: Interfaces for the Optical Transport Network"; } identity term-phys { base term-type; description "Physical layer termination"; } Beller, et al. Expires 28 April 2022 [Page 8] Internet-Draft Layer 0 Types - Revision 2 October 2021 identity term-otu { base term-type; description "OTU (Optical Transport Unit) termination"; } identity term-odu { base term-type; description "ODU (Optical Data Unit) termination"; } identity term-opu { base term-type; description "OPU (Optical Payload Unit) termination"; } identity otu-type { description "Base identity from which specific OTU identities are derived"; reference "ITU-T G.709: Interfaces for the Optical Transport Network"; } identity OTU1 { base otu-type; description "OTU1 (2.66 Gb/s)"; } identity OTU1e { base otu-type; description "OTU1e (11.04 Gb/s)"; } identity OTU1f { base otu-type; description "OTU1f (11.27 Gb/s)"; } identity OTU2 { base otu-type; description "OTU2 (10.70 Gb/s)"; } Beller, et al. Expires 28 April 2022 [Page 9] Internet-Draft Layer 0 Types - Revision 2 October 2021 identity OTU2e { base otu-type; description "OTU2e (11.09 Gb/s)"; } identity OTU2f { base otu-type; description "OTU2f (11.31G)"; } identity OTU3 { base otu-type; description "OTU3 (43.01 Gb/s)"; } identity OTU3e1 { base otu-type; description "OTU3e1 (44.57 Gb/s)"; } identity OTU3e2 { base otu-type; description "OTU3e2 (44.58 Gb/s)"; } identity OTU4 { base otu-type; description "OTU4 (111.80 Gb/s)"; } identity OTUCn { base otu-type; description "OTUCn (n x 105.25 Gb/s)"; } identity type-power-mode { description "power equalization mode used within the OMS and its elements"; } Beller, et al. Expires 28 April 2022 [Page 10] Internet-Draft Layer 0 Types - Revision 2 October 2021 identity power-spectral-density { base type-power-mode; description "all elements must use power spectral density (W/Hz)"; } identity carrier-power { base type-power-mode; description "all elements must use power (dBm)"; } /* * Typedefs */ typedef operational-mode { type string; description "Organization/vendor specific mode that guarantees interoperability."; reference "ITU-T G.698.2 (11/2018)"; } typedef standard-mode { type string; description "ITU-T G.698.2 standard mode that guarantees interoperability. It must be an string with the following format: B-DScW-ytz(v) where all these attributes are conformant to the ITU-T recomendation"; reference "ITU-T G.698.2 (11/2018)"; } typedef organization-identifier { type string; description "vendor/organization identifier that uses a private mode out of already defined in G.698.2 ITU-T application-code"; reference "RFC7581: Routing and Wavelength Assignment Information Encoding for Wavelength Switched Optical Networks"; } typedef frequency-thz { type decimal64 { Beller, et al. Expires 28 April 2022 [Page 11] Internet-Draft Layer 0 Types - Revision 2 October 2021 fraction-digits 6; } units THz; description "The DWDM frequency in THz, e.g., 193.112500"; reference "RFC6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } typedef frequency-ghz { type decimal64 { fraction-digits 3; } units GHz; description "The DWDM frequency in GHz, e.g., 193112.500"; reference "RFC6205: Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers"; } typedef dbm-t { type int32; units ".01dbm"; description "Amplifiers and Transceivers Power in dBm."; } typedef snr { type decimal64 { fraction-digits 2; } units "dB@0.1nm"; description "(Optical) Signal to Noise Ratio measured over 0.1 nm resolution bandwidth"; } 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"; Beller, et al. Expires 28 April 2022 [Page 12] Internet-Draft Layer 0 Types - Revision 2 October 2021 } 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"; } /* * Groupings */ /* supported inverse multiplexing capabilities such as max. OTSiG:OTSi cardinality It is a transponder attribute not transceiver */ /* leaf multiplexing-cap { type uint32; config false; description "supported inverse multiplexing capabilities such as max. OTSiG:OTSi cardinality"; } */ grouping transceiver-capabilities { description "This grouping is intended to be use for reporting the capabilities of a transceiver."; container supported-modes { description "Transceiver's supported modes."; list supported-mode { key "mode-id"; config false; description "list of supported transceiver's modes."; leaf mode-id { type string { length "1..255"; Beller, et al. Expires 28 April 2022 [Page 13] Internet-Draft Layer 0 Types - Revision 2 October 2021 } description "ID for the supported transceiver's mode."; } choice mode { mandatory true; description "Indicates whether the transceiver's mode is a standard mode, an organizational mode or an explicit mode."; case G.698.2 { uses standard-mode; } case organizational-mode { container organizational-mode { description "The set of attributes for an organizational mode"; uses organizational-mode; uses common-organizational-explicit-mode; } // container organizational-mode } case explicit-mode { container explicit-mode { description "The set of attributes for an explicit mode"; container supported-modes { description "Container for all the standard and organizational modes supported by the transceiver's explicit mode."; leaf-list supported-application-codes { type leafref { path "../../../mode-id"; } must "../../../../" + "supported-mode[mode-id=current()]/" + "standard-mode" { description "The pointer is only for application codes supported by transceiver."; } description "List of pointers to the application codes supported by the transceiver's explicit mode."; } leaf-list supported-organizational-modes { type leafref { path "../../../mode-id"; } must "../../../../" Beller, et al. Expires 28 April 2022 [Page 14] Internet-Draft Layer 0 Types - Revision 2 October 2021 + "supported-mode[mode-id=current()]/" + "organizational-mode" { description "The pointer is only for organizational modes supported by transceiver."; } description "List of pointers to the organizational modes supported by the transceiver's explicit mode."; } } // container supported-modes uses common-explicit-mode; uses common-organizational-explicit-mode; } // container explicit-mode } // end of case explicit-mode } // end of choice } // list supported-modes } // container supported-modes } // grouping transceiver-capabilities grouping standard-mode { description "ITU-T G.698.2 standard mode that guarantees interoperability. It must be an string with the following format: B-DScW-ytz(v) where all these attributes are conformant to the ITU-T recomendation"; leaf standard-mode { type standard-mode; config false; description "G.698.2 standard mode"; } } grouping organizational-mode { description "Transponder operational mode supported by organizations or vendor"; leaf operational-mode { type operational-mode; config false; description "configured organization- or vendor-specific application identifiers (AI) supported by the transponder"; } leaf organization-identifier { Beller, et al. Expires 28 April 2022 [Page 15] Internet-Draft Layer 0 Types - Revision 2 October 2021 type organization-identifier; config false; description "organization identifier that uses organizational mode"; } } grouping cd-pmd-penalty { description "entries of table; triplet chromatic dispersion, polarization mode dispersion and associated penalty"; leaf chromatic-dispersion { type decimal64 { fraction-digits 2; range "0..max"; } units "ps/nm"; config false; mandatory true; description "chromatic dispersion"; } leaf polarization-mode-dispersion { type decimal64 { fraction-digits 2; range "0..max"; } units "ps"; config false; mandatory true; description "Polarization mode dispersion"; } leaf penalty { type decimal64 { fraction-digits 2; range "0..max"; } units "dB"; config false; mandatory true; description "Associated penalty on the receiver"; } } grouping pdl-penalty { description "entries of table; pair of values polarization dependent loss Beller, et al. Expires 28 April 2022 [Page 16] Internet-Draft Layer 0 Types - Revision 2 October 2021 and associated penalty"; leaf max-polarization-dependent-loss { type decimal64 { fraction-digits 2; } units "dB"; config false; mandatory true; description "Maximum acceptable accumulate polarization dependent loss"; } leaf penalty { type uint8; units "dB"; config false; mandatory true; description "Associated penalty on the receiver"; } } /* * This grouping represent the list of attributes related to * optical impairment limits for explicit mode * (min OSNR, max PMD, max CD, max PDL, Q-factor limit, etc.) * In case of standard and operational mode the attributes are * implicit */ grouping common-explicit-mode { description "Attributes capabilities related to explicit mode of an optical transceiver"; leaf line-coding-bitrate { type identityref { base line-coding; } config false; description "Bit rate/line coding of optical tributary signal"; reference "ITU-T G.698.2 section 7.1.2"; } leaf max-polarization-mode-dispersion { type decimal64 { fraction-digits 2; range "0..max"; } units "ps"; Beller, et al. Expires 28 April 2022 [Page 17] Internet-Draft Layer 0 Types - Revision 2 October 2021 config false; description "Maximum acceptable accumulated polarization mode dispersion on the receiver"; } leaf max-chromatic-dispersion { type decimal64 { fraction-digits 2; range "0..max"; } units "ps/nm"; config false; description "Maximum acceptable accumulated chromatic dispersion on the receiver"; } list chromatic-and-polarization-dispersion-penalty { config false; description "Optional penalty associated with a given accumulated CD and PMD. This list of triplet cd, pmd, penalty can be used to sample the function penalty = f(CD, PMD)."; uses cd-pmd-penalty ; } leaf max-diff-group-delay { type int32; config false; description "Maximum Differential group delay of this mode for this lane"; } list max-polarization-dependent-loss-penalty { config false; description "Optional penalty associated with the maximum acceptable accumulated polarization dependent loss. This list of pair pdl and penalty can be used to sample the function pdl = f(penalty)."; uses pdl-penalty ; } leaf available-modulation-type { type identityref { base modulation; } config false; description "Modulation type the specific transceiver in the list can support"; Beller, et al. Expires 28 April 2022 [Page 18] Internet-Draft Layer 0 Types - Revision 2 October 2021 } leaf min-OSNR { type snr; config false; description "min OSNR measured over 0.1 nm resolution bandwidth: if received OSNR at minimum Rx-power is lower than MIN-OSNR, an increased level of bit-errors post-FEC needs to be expected."; // change resolution BW from 12.5 GHz to 0.1 nm } leaf min-Q-factor { type int32; units "dB"; config false; description "min Qfactor at FEC threshold"; } leaf available-baud-rate { type uint32; units Bd; config false; description "Baud-rate the specific transceiver in the list can support. Baud-rate is the unit for symbol rate or modulation rate in symbols per second or pulses per second. It is the number of distinct symbol changes (signal events) made to the transmission medium per second in a digitally modulated signal or a line code"; } leaf roll-off { type decimal64 { fraction-digits 4; range "0..1"; } config false; description "the roll-off factor (beta with values from 0 to 1) identifies how the real signal shape exceed the baud rate. If=0 it is exactly matching the baud rate.If=1 the signal exceeds the 50% of the baud rate at each side."; } leaf min-carrier-spacing { Beller, et al. Expires 28 April 2022 [Page 19] Internet-Draft Layer 0 Types - Revision 2 October 2021 type frequency-ghz; config false; description "This attribute specifies the minimum nominal difference between the carrier frequencies of two homogeneous OTSis (which have the same optical characteristics but the central frequencies) such that if they are placed next to each other the interference due to spectrum overlap between them can be considered negligible. In case of heterogeneous OTSi it is up to path computation engine to determine the minimum distance between the carrier frequency of the two adjacent OTSi."; } leaf available-fec-type { type identityref { base fec-type; } config false; description "Available FEC"; } 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"; } config false; description "Threshold on the BER, for which FEC is able to correct errors"; } } // grouping common-explicit-mode grouping common-organizational-explicit-mode { description "Common capability attributes limit range in case of operational mode and explicit mode. These attributes are supported separately in case of application codes"; /* transmitter tuning range (f_tx-min, f_tx-max) */ Beller, et al. Expires 28 April 2022 [Page 20] Internet-Draft Layer 0 Types - Revision 2 October 2021 leaf min-central-frequency { type frequency-thz; config false; description "This parameter indicates the minimum frequency for the transmitter tuning range."; } leaf max-central-frequency { type frequency-thz; config false; description "This parameter indicates the maximum frequency for the transmitter tuning range."; } /* transmitter-tunability-grid */ leaf central-frequency-step { type frequency-ghz; config false; description "This parameter indicates the transmitter tunability grid as the distance between two adjacent carrier frequencies of the transmitter tuning range."; } /* supported transmitter power range [p_tx-min, p_tx_max] */ leaf tx-channel-power-min { type dbm-t; config false; description "The minimum output power of this interface"; } leaf tx-channel-power-max { type dbm-t; config false; description "The maximum output power of this interface"; } /* supported receiver power range [p_rx-min, p_rx_max] */ leaf rx-channel-power-min { type dbm-t; config false; description "The minimum input power of this interface"; } leaf rx-channel-power-max { type dbm-t; Beller, et al. Expires 28 April 2022 [Page 21] Internet-Draft Layer 0 Types - Revision 2 October 2021 config false; description "The maximum input power of this interface"; } leaf rx-total-power-max { type dbm-t; config false; description "Maximum rx optical power for all the channels"; } } // grouping common-organizational-explicit-mode /* This grouping represent the list of configured parameters */ /* values independent of operational mode */ grouping common-transceiver-configured-param { description "Capability of an optical transceiver"; leaf otsi-carrier-frequency { type frequency-thz; description "OTSi carrier frequency, equivalent to the actual configured transmitter frequency"; } leaf tx-channel-power { type dbm-t; description "The current channel transmit power"; } leaf rx-channel-power { type dbm-t; config false; description "The current channel received power "; } leaf rx-total-power { type dbm-t; config false; description "Current total received power"; } } // grouping for configured attributes out of mode grouping l0-tunnel-attributes { description "Parameters for Layer0 (WSON or Flexi-Grid) Tunnels."; leaf fec-type { type identityref { base fec-type; } Beller, et al. Expires 28 April 2022 [Page 22] Internet-Draft Layer 0 Types - Revision 2 October 2021 description "FEC type."; } leaf termination-type { type identityref { base term-type; } description "Termination type."; } leaf bit-stuffing { type boolean; description "Bit stuffing enabled/disabled."; } } grouping l0-path-constraints { description "Global named path constraints configuration grouping for Layer0 (WSON or Flexi-Grid) paths."; leaf wavelength-assignment { type identityref { base wavelength-assignment; } description "Wavelength Allocation Method"; } } grouping frequency-range { description "The parameters that define a frequency range."; leaf lower-frequency { type frequency-thz; mandatory true; description "The lower frequency boundary of the frequency range."; } leaf upper-frequency { type frequency-thz; must '. > ../lower-frequency' { error-message "The upper frequency must be greater than the lower frequency."; } mandatory true; description Beller, et al. Expires 28 April 2022 [Page 23] Internet-Draft Layer 0 Types - Revision 2 October 2021 "The upper frequency boundary of the frequency range."; } } } Figure 1 4. Acknowledgements To be added if any. 5. Contributors Gabriele Galimberti Cisco Email: ggalimbe@cisco.com Enrico Griseri Nokia Email: Enrico.Griseri@nokia.com Aihua Guo Futurewei Email: aihuaguo@futurewei.com 6. IANA Considerations This memo includes no request to IANA. All drafts are required to have an IANA considerations section (see Guidelines for Writing an IANA Considerations Section in RFCs [RFC5226] for a guide). If the draft does not require IANA to do anything, the section contains an explicit statement that this is the case (as above). If there are no requirements for IANA, the section will be removed during conversion into an RFC by the RFC Editor. Beller, et al. Expires 28 April 2022 [Page 24] Internet-Draft Layer 0 Types - Revision 2 October 2021 7. Security Considerations All drafts are required to have a security considerations section. See RFC 3552 [RFC3552] for a guide. 8. References 8.1. Normative References [I-D.ietf-ccamp-optical-impairment-topology-yang] Lee, Y., Rouzic, E. L., Lopez, V., Galimberti, G., and D. Beller, "A YANG Data Model for Optical Impairment-aware Topology", Work in Progress, Internet-Draft, draft-ietf- ccamp-optical-impairment-topology-yang-07, 8 July 2021, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [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, . [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . [RFC8795] Liu, X., Bryskin, I., Beeram, V., Saad, T., Shah, H., and O. Gonzalez de Dios, "YANG Data Model for Traffic Engineering (TE) Topologies", RFC 8795, DOI 10.17487/RFC8795, August 2020, . [RFC9093] Zheng, H., Lee, Y., Guo, A., Lopez, V., and D. King, "A YANG Data Model for Layer 0 Types", RFC 9093, DOI 10.17487/RFC9093, August 2021, . [RFC9094] Zheng, H., Lee, Y., Guo, A., Lopez, V., and D. King, "A YANG Data Model for Wavelength Switched Optical Networks (WSONs)", RFC 9094, DOI 10.17487/RFC9094, August 2021, . 8.2. Informative References Beller, et al. Expires 28 April 2022 [Page 25] Internet-Draft Layer 0 Types - Revision 2 October 2021 [I-D.ietf-ccamp-dwdm-if-param-yang] Galimberti, G., Kunze, R., Burk, A., Hiremagalur, D., and G. Grammel, "A YANG model to manage the optical interface parameters for an external transponder in a WDM network", Work in Progress, Internet-Draft, draft-ietf-ccamp-dwdm- if-param-yang-06, 12 July 2021, . [RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629, DOI 10.17487/RFC2629, June 1999, . [RFC3552] Rescorla, E. and B. Korver, "Guidelines for Writing RFC Text on Security Considerations", BCP 72, RFC 3552, DOI 10.17487/RFC3552, July 2003, . [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", RFC 5226, DOI 10.17487/RFC5226, May 2008, . Authors' Addresses Dieter Beller (editor) Nokia Email: Dieter.Beller@nokia.com Sergio Belotti (editor) Nokia Email: Sergio.Belotti@nokia.com Haomian Zheng Huawei Email: ZhengHaomian@huawei.com Italo Busi Huawei Email: Italo.Busi@huawei.com Beller, et al. Expires 28 April 2022 [Page 26] Internet-Draft Layer 0 Types - Revision 2 October 2021 Esther Le Rouzic Orange Email: esther.lerouzic@orange.com Beller, et al. Expires 28 April 2022 [Page 27]