CCAMP G. Martinelli, Ed. Internet-Draft Cisco Intended status: Standards Track Y. Lee, Ed. Expires: January 3, 2019 Huawei Technologies G. Galimberti Cisco F. Zhang Huawei Technologies July 2, 2018 Information Encoding for WSON with Impairments Validation draft-ietf-ccamp-wson-iv-encode-01 Abstract Impairment-Aware (IA) Routing and Wavelength Assignment (RWA) function might be required in Wavelength Switched Optical Networks (WSON) that already support RWA. This document defines proper encoding to support this operation. It goes in addition to the available impairment-free WSON encoding and it is fully compatible with it. As the information model, the encoding is independent from control plane architectures and protocol implementations. Its definitions can be used in related protocol extensions. 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 January 3, 2019. Martinelli, et al. Expires January 3, 2019 [Page 1] Internet-Draft Encoding WSON Info Model with Impairments July 2018 Copyright Notice 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 (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 . . . . . . . . . . . . . . . . . . 3 2. Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1. Optical Parameter . . . . . . . . . . . . . . . . . . . . 3 2.2. Impairment Vector . . . . . . . . . . . . . . . . . . . . 5 2.3. Connectivity Matrix Field for Impairment . . . . . . . . 6 2.4. Resource Block Information . . . . . . . . . . . . . . . 8 3. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 8 4. Contributing Authors . . . . . . . . . . . . . . . . . . . . 9 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9 6. Security Considerations . . . . . . . . . . . . . . . . . . . 9 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.1. Normative References . . . . . . . . . . . . . . . . . . 10 7.2. Informative References . . . . . . . . . . . . . . . . . 10 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11 1. Introduction In case of WSON where optical impairments play a significant role, the framework document [RFC6566] defines related control plane architectural options for Impairment Aware Routing and Wavelength Assignment (IA-RWA). This document provides a suitable encoding for the related WSON impairment information model as defined [I-D.ietf-ccamp-wson-iv-info]. This document directly refers to ITU recommendations [ITU.G680] and [ITU.G697] as already detailed in the information model. Martinelli, et al. Expires January 3, 2019 [Page 2] Internet-Draft Encoding WSON Info Model with Impairments July 2018 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]. 2. Encoding This section details encoding for all elements defined within [I-D.ietf-ccamp-wson-iv-info]. Elements to encode are: Optical Parameter (OPTICAL_PARAM) Optical Impairment Vector (OIV) Impairment Matrix Impairment Resource Block Information 2.1. Optical Parameter The OPTICAL_PARAM is defined as a sub-TLV object. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |S|V| Reserved | ParamSource | ParamID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Value | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Variance (Optional) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ The following flag is defined: S: Standard bit. S=1 identifies a set of parameters standardized by ITU; while S=0 identifies a non-standardized set of parameters. V: Variance bit. V=0 only parameter value, V=1 parameter value and variance. With the flag S=1 the following parameters are defined: ParamSource = 1. Identify the ITU document that defines the following parameter list. Currently [ITU.G697] defines this value 1 for this parameter. Martinelli, et al. Expires January 3, 2019 [Page 3] Internet-Draft Encoding WSON Info Model with Impairments July 2018 ParamID. Parameter identifier according to the source. [ITU.G697] table V.3 defines the following identifiers: 1. Total Power (dBm) Not reported within [I-D.ietf-ccamp-wson-iv-info] parameter list but relates to Channel Power through the number of channels. 2. Channel Power (dBm). Referred as parameter L-3 in [I-D.ietf-ccamp-wson-iv-info] 3. Reserved ("Frequency Deviation from Nominal, GHz", defined in [ITU.G697] but not used) 4. Reserved ("Wavelength Deviation from Nominal, nm", defined in [ITU.G697] but not used) 5. OSNR (db). Referred as parameter G-1 in [I-D.ietf-ccamp-wson-iv-info] 6. Reserved. (Q Factor, a pure number). Not reported within [I-D.ietf-ccamp-wson-iv-info] parameter list but is a known index for assessing channel quality. 7. PMD (ps). Referred as parameter G-3 in [I-D.ietf-ccamp-wson-iv-info] 8. Residual Chromatic Dispersion (ps/nm). Referred as parameter G-2 in [I-D.ietf-ccamp-wson-iv-info] Value. Value for the parameter. As defined by [ITU.G697], it is a 32 bit IEEE floating point number. Variance. Variance for the parameter, a 32 bit IEEE floating point number. According to [I-D.ietf-ccamp-wson-iv-info], there are some parameters required for the IV function not listed within [ITU.G697]. Current information source for such parameters is [LS78] hence, this document proposes to use a different value for the field parameter source. ParamSource = 0 (proposal). List of parameters within [I-D.ietf-ccamp-wson-iv-info]. ParamID. Martinelli, et al. Expires January 3, 2019 [Page 4] Internet-Draft Encoding WSON Info Model with Impairments July 2018 A number that take the following list of values. 1. Ripple (dBm). L-4 in [I-D.ietf-ccamp-wson-iv-info]. 2. Channel signal-spontaneous noise figure. L-5 in [I-D.ietf-ccamp-wson-iv-info]. 3. DGD, Differential Group Delay. L-8 in [I-D.ietf-ccamp-wson-iv-info]. 4. Reflectance. L-11 in [I-D.ietf-ccamp-wson-iv-info]. 5. Isolation. L-12 in [I-D.ietf-ccamp-wson-iv-info]. 6. Channel extinction. L-13 in [I-D.ietf-ccamp-wson-iv-info]. 7. Attenuation Coefficient. L-14 in [I-D.ietf-ccamp-wson-iv-info]. 2.2. Impairment Vector This sub-TLV is a list of optical parameters and they MAY have a wavelength dependency information. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0| Reserved | Number of Parameters | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Optical Param sub-TLV(s) | : | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where: W = 0. Wavelength Dependency flag. There is no wavelength dependency. Number of Parameters contained in this vector. Optical Param sub-TLV(s) present a list of Object as defined in Section 2.1. Martinelli, et al. Expires January 3, 2019 [Page 5] Internet-Draft Encoding WSON Info Model with Impairments July 2018 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1| Reserved | Number of Parameters | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Label Set | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Optical Param sub-TLV(s) | : | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where: W = 1. Wavelength Dependency flag. There is wavelength dependency. The Label Set object is defined in [RFC7579] Section 2.6. Likely an inclusive range will be the only option required by the Action defined in the Label Set. 2.3. Connectivity Matrix Field for Impairment As defined by the [I-D.ietf-ccamp-wson-iv-info], the impairment matrix follows the same structure as the connectivity matrix. The encoding of the connectivity matrix for impairment is enhanced from the Connectivity Matrix Field as defined in Section 2.1 of [RFC7579]. Martinelli, et al. Expires January 3, 2019 [Page 6] Internet-Draft Encoding WSON Info Model with Impairments July 2018 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Conn | MatrixID | Reserved |N| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Set A #1 | : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Set B #1 | : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Impairment Vector sub-TLV(s) | : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Additional Link Set pairs and Impairment Vector(s) | : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Conn | MatrixID | Reserved |N| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Impairment Vector sub-TLV(s) | : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where: Connectivity (Conn) (4 bits) has value 2 for the impairment matrix (Values 0 and 1 defined by [RFC7579]). MatrixID: matrix identifier,following same rules as [RFC7579]. N: Node scope flag. With this flag set (N=0), there's no Link Set information but only a list of optical parameters TLVs that apply to the whole optical node. The usage of multiple matrixes with connectivity type equal to 2 (Impairment Matrix) MIGHT be used to group optical parameters by connectivity. For example, if a subset of parameters apply to the whole node, a unique matrix with flag N=1 is used. At the same some another subset of parameters applies only to some LinkSet pairs, a specific Impairment Matrix will be added. Martinelli, et al. Expires January 3, 2019 [Page 7] Internet-Draft Encoding WSON Info Model with Impairments July 2018 2.4. Resource Block Information The Resource Block Information field is used to represent resource signal constraints and processing capabilities of a node. As defined by [I-D.ietf-ccamp-wson-iv-info], the concept of resource block is extended to support the description of the impairments related to that block. The encoding expands the same structure as the one defined in Section 4 of [RFC7581], with the addition of an optional Impairment Vector sub-object: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Set Field | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |I|O|B| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Optical Interface Class List(s) (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Acceptable Client Signal Type (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Input Bit Rate List (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Processing Capabilities List (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | OIV-Impairment Vector (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ The Impairment Vector is defined within Section 2.2. All the other fields are defined within [RFC7581]. 3. Acknowledgements Authors would like to acknowledge Greg Bernstein and Moustafa Kattan as authors of a previous similar draft whose content partially converged here. Authors would like to thank ITU SG15/Q6 and in particular Peter Stassar and Pete Anslow for providing useful information and text to CCAMP through join meetings and liaisons. Martinelli, et al. Expires January 3, 2019 [Page 8] Internet-Draft Encoding WSON Info Model with Impairments July 2018 4. Contributing Authors This document was the collective work of several authors. The text and content of this document was contributed by the editors, authors and the co-authors listed below (the contact information for the editors appears in appropriate section and is not repeated below): Domenico Siracusa CREATE-NET via alla Cascata 56/D, Povo Trento 38123 Italy Email: domenico.siracusa@create-net.org Andrea Zanardi CREATE-NET via alla Cascata 56/D, Povo Trento 38123 Italy Email: andrea.zanardi@create-net.org Federico Pederzolli CREATE-NET via alla Cascata 56/D, Povo Trento 38123 Italy Email: federico.perderzolli@create-net.org 5. IANA Considerations This document does not contain any IANA request. 6. Security Considerations This document defines an protocol-neutral encoding for an information model describing impairments in optical networks and it does not introduce any security issues. If such a encoding is put into use within a network it will by its nature contain details of the physical characteristics of an optical network. Such information would need to be protected from intentional or unintentional disclosure. Martinelli, et al. Expires January 3, 2019 [Page 9] Internet-Draft Encoding WSON Info Model with Impairments July 2018 7. References 7.1. Normative References [ITU.G680] International Telecommunications Union, "Physical transfer functions of optical network elements", ITU-T Recommendation G.680, July 2007. [ITU.G697] International Telecommunications Union, "Optical monitoring for dense wavelength division multiplexing systems", ITU-T Recommendation G.697, February 2012. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . 7.2. Informative References [I-D.ietf-ccamp-wson-iv-info] Martinelli, G., Zhang, X., Galimberti, G., Zanardi, A., Siracusa, D., Pederzolli, F., Lee, Y., and F. Zhang, "Information Model for Wavelength Switched Optical Networks (WSONs) with Impairments Validation", draft-ietf- ccamp-wson-iv-info-05 (work in progress), July 2017. [LS78] International Telecommunications Union SG15/Q6, "LS/s on CCAMP Liaison to ITU-T SG15 Q6 and Q12 on WSON", LS https://datatracker.ietf.org/liaison/1288/, October 2013. [RFC6566] Lee, Y., Ed., Bernstein, G., Ed., Li, D., and G. Martinelli, "A Framework for the Control of Wavelength Switched Optical Networks (WSONs) with Impairments", RFC 6566, DOI 10.17487/RFC6566, March 2012, . [RFC7579] Bernstein, G., Ed., Lee, Y., Ed., Li, D., Imajuku, W., and J. Han, "General Network Element Constraint Encoding for GMPLS-Controlled Networks", RFC 7579, DOI 10.17487/RFC7579, June 2015, . Martinelli, et al. Expires January 3, 2019 [Page 10] Internet-Draft Encoding WSON Info Model with Impairments July 2018 [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, . Authors' Addresses Giovanni Martinelli (editor) Cisco via Santa Maria Molgora 48/C Vimercate, MB 20871 Italy Phone: +39 039 2092044 Email: giomarti@cisco.com Young Lee (editor) Huawei Technologies 5340 Legacy Drive Plano, TX 75023 U.S.A Email: leeyoung@huawei.com Gabriele M. Galimberti Cisco Via Santa Maria Molgora 48/C Vimercate, MB 20871 Italy Phone: +39 039 2091462 Email: ggalimbe@cisco.com Fatai Zhang Huawei Technologies F3-5-B R&D Center, Huawei Base Bantian, Longgang District Shenzen 518129 P.R. China Email: zhang.fatai@huawei.com Martinelli, et al. Expires January 3, 2019 [Page 11]