Internet Engineering Task Force D. Hiremagalur, Ed. Internet-Draft G. Grammel, Ed. Intended status: Experimental Juniper Expires: 26 January 2024 G. Galimberti, Ed. Cisco R. Kunze, Ed. Deutsche Telekom July 2023 Extension to the Link Management Protocol (LMP/DWDM -rfc4209) for Dense Wavelength Division Multiplexing (DWDM) Optical Line Systems to manage the application code of optical interface parameters in DWDM application draft-ggalimbe-ccamp-flex-if-lmp-16 Abstract This experimental memo defines extensions to LMP(rfc4209) for managing Optical parameters associated with Wavelength Division Multiplexing (WDM) adding a set of parameters related to multicarrier DWDM interfaces to be used in Spectrum Switched Optical Networks (sson). Copyright Notice Copyright (c) 2011 IETF Trust and the persons identified as the document authors. All rights reserved. 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 January 2024. Hiremagalur, et al. Expires 26 January 2024 [Page 1] Internet-Draft draft-ggalimbe-ccamp-flex-if-lmp-16 July 2023 Copyright Notice Copyright (c) 2023 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 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 2. DWDM line system . . . . . . . . . . . . . . . . . . . . . . 3 3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4. Extensions to LMP-WDM Protocol . . . . . . . . . . . . . . . 4 5. Multi carrier Transceiver . . . . . . . . . . . . . . . . . . 5 6. Security Considerations . . . . . . . . . . . . . . . . . . . 7 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7 8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 7 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 9.1. Normative References . . . . . . . . . . . . . . . . . . 7 9.2. Informative References . . . . . . . . . . . . . . . . . 8 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9 1. Introduction This experimental extension addresses the use cases described by "draft-ietf-ccamp-dwdm-if-lmp" and extends it to the Spectrum Switched Optical Network applications. LMP [RFC4902] provides link property correlation capabilities that can be used between a transceiver device and an Optical Line System (OLS) device. Link property correlation is a procedure by which, intrinsic parameters and capabilities are exchanged between two ends of a link. Link property correlation as defined in RFC4204 allows either end of the link to supervise the received signal and operates within a commonly understood parameter window. Here the term 'link' refers in particular to the attachment link between OXC and OLS (see Figure 1). The relevant novelty is the interface configuration having a multiple carrier where the client signal is spread on. The parameters are not yet fully defined by ITU-T, so this document can jast be seen as an experimental proposal not binding operators and vendors to comply and implement them Hiremagalur, et al. Expires 26 January 2024 [Page 2] Internet-Draft draft-ggalimbe-ccamp-flex-if-lmp-16 July 2023 2. DWDM line system Figure 1 shows a set of reference points (Rs and Ss), for a single- channel connection between transmitter (Tx) and receiver (Rx) devices. Here the DWDM network elements in between those devices include an Optical Multiplexer (OM) and an Optical Demultiplexer (OD). In addition it may include one or more Optical Amplifiers (OA) and one or more Optical Add-Drop Multiplexers (OADM). Ss +-------------------------------------------------+ Rs | | DWDM Network Elements | | +---+ | | | \ / | | | +---+ Tx L1---|->| \ +------+ +------+ / |--|-->Rx L1 +---+ | | | | | +------+ | | | | | +---+ +---+ | | FX | | | | FLEX | | | | FX | | +---+ Tx L2---|->| OM |-->|------|->|ROADM |--|------|->| OD |--|-->Rx L2 +---+ | | | | | | | | | | | | +---+ +---+ | | | | | +------+ | | | | | +---+ Tx L3---|->| / | DWDM | | ^ | DWDM | \ |--|-->Rx L3 +---+ | | / | Link +----|--|----+ Link | \ | | +---+ +-----------+ | | +----------+ +--+ +--+ | | Rs v | Ss +-----+ +-----+ |RxLx | |TxLx | +-----+ +-----+ Ss = Sender reference point at the DWDM network element tributary output, this can be a set of multiple transceivers carrying the same client payload. Rs = Receiver reference point at the DWDM network element tributary input this can be a set of multiple transceivers carrying the same client payload. FX OM = Flex-Spectrum Optical Mux FX OD = Flex-Spectrum Optical Demux Flex ROADM = Flex-Spectrum Optical Add Drop Mux (reconfigurable) Figure 1: Linear Single Channel approach extending Fig. 5.1/G.698.2 Figure 2 Extended LMP Model ( from [RFC4209] ) Hiremagalur, et al. Expires 26 January 2024 [Page 3] Internet-Draft draft-ggalimbe-ccamp-flex-if-lmp-16 July 2023 +------+ Ss +------+ +------+ Rs +------+ | | ----- | | | | ----- | | | OXC1 | ----- | OLS1 | ===== | OLS2 | ----- | OXC2 | | | ----- | | | | ----- | | +------+ +------+ +------+ +------+ ^ ^ ^ ^ ^ ^ | | | | | | | +-----LMP-----+ +-----LMP-----+ | | | +----------------------LMP-----------------------+ OXC : is an entity that contains Multiple carriers transponders OLS : generic Flex-Spectrum optical system, it can be - Optical Mux, Optical Demux, Optical Add Drop Mux, Amplifier etc. OLS to OLS: represents the Optical Multiplex section Rs/Ss : reference points in between the OXC and the OLS Figure 2: Extended LMP Model 3. Use Cases The set of paramentes exchanged between OXC and OLS is to support the Spectrum Switched Optical Network in therms of Number of Sub-carriers available at the transceiver and their characteristics to provide the SSON control plane all the information suitable to calculate the path and the optical feasibility. This draft extends the "draft-ietf- ccamp-dwdm-if-lmp" to sson applications. 4. Extensions to LMP-WDM Protocol This document defines extensions to [RFC4209] to allow a set of characteristic parameters, to be exchanged between a router or optical switch and the optical line system to which it is attached. In particular, this document defines additional Data Link sub-objects to be carried in the LinkSummary message defined in [RFC4204] and [RFC6205]. The OXC and OLS systems may be managed by different Network Management Systems and hence may not know the capability and status of their peer. These messages and their usage are defined in subsequent sections of this document. The following new messages are defined for the SSON extension - Multi carrier Transceiver (sub-object Type = TBA) Hiremagalur, et al. Expires 26 January 2024 [Page 4] Internet-Draft draft-ggalimbe-ccamp-flex-if-lmp-16 July 2023 5. Multi carrier Transceiver These are a set of general parameters extending the description in [G698.2] and [G.694.1]. ITU-T working groups are working to detail most of parameters and an update of the TLV may be required. Other than the Application Identifier described in [G698.2] and draft-ietf-ccamp-dwdm-if-lmp the parameters to describe a multicarrier transceiver are describes as follows: 1. Modulation format: indicates the Transceiver capabilities to support a single or multiple modulation format like: BPSK, DC-DP-BSPSK, QPSK, DP-QPSK, QAM16, DP-QAM16, DC-DP-QAM16, 64QAM. Hybrid modulation format are supported as well and the parameter is given in bit per symbol. 2. FEC: indicates the FEC types the transceiver can support 3. baud rate: symbols rate, basically this identify the channel symbols number per second 4. Num Carriers: number of (sub)carriers the trasceiver can support and can be "mapped" in a Mediachannel (or tunnel) 5. Bits/symbol: number of bit per simbol - fractional in case of hybrid modulation format. (aka spectral efficiency) 6. Subcarrier band (minimum distance between subcarriers) in GHz 7. Guard band (required guard band at the side of media channel) 8. Sub-carrier TX Power: output optical power the transceiver can provide 9. Sub-carrier RX Power: Input optical power Range the transceiver can support, this is known also as Sensitivity 10 Max-pol-power-difference: max power difference between the polarised components 11 Max-pol-skew-difference: maw Skew between polarised signal and subcarriers supported by the transceiver 12. Max-inter-carrier-skew: maximum skew between carriers in tbe same mediachannel (or tunnel) 13. Sub-carrier OSNR robustness Figure 3: The format of the this sub-object (Type = TBA, Length = TBA) is as follows: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | (Reserved) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |S|I| Modulation ID | FEC | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | baud rate (Symbol Rate) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Hiremagalur, et al. Expires 26 January 2024 [Page 5] Internet-Draft draft-ggalimbe-ccamp-flex-if-lmp-16 July 2023 | Number of subcarriers | Bit/Symbol | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | subcarrier band | guard band | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sub-carrier TX power | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sub-carrier RX power HIGH | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sub-carrier RX power LOW | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max-pol-power-difference | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max-pol-skew-difference | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max-inter-carrier-skew | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sub-carrier OSNR | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - S: standardized format; - I: input / output (1 / 0) - Modulation ID (Format) : is the modulation type: BPSK, DC DP BSPSK, QPSK, DP QPSK, 8QAM, 16QAM, 32QAM, 64QAM, etc. - (ITU-T reference) - value > 32768 (first bit is 1): custom defined values Value 0 is reserved to be used if no value is defined - FEC: the signal Forward Error Corrections type (16-bit unsigned integer), the defined values are: - (ITU-T reference) - 32768 (first bit is 1): custom defined values Value 0 is reserved to be used if no value is defined - Baud Rate: the signal symbol rate (IEEE 32-bit float, in bauds/s) Value 0 is reserved to be used if no value is defined - Num Carriers - Bits/symbol(BPS) this indicates the bit per symbol in case of hybrid modulation format. It is an off-set with values from 0 to 127 to be applied to the specified Modulation Format and indicates the mix between the selected Modulation Format and its upper adjacent. (e.g. QPSK + 63 BPS indicates that there is a 50% MIX between QPSK and 8-QAM = 2.5 bits per symbol) If value = 0 the standard Modulation Format is applied - Subcarrier band (minimum distance between subcarriers) - Guard band (required guard band at the side of media channel) - Sub-carrier Transmit Power - Sub-carrier Receive HIGH Power range (Sensitivity) Hiremagalur, et al. Expires 26 January 2024 [Page 6] Internet-Draft draft-ggalimbe-ccamp-flex-if-lmp-16 July 2023 - Sub-carrier Receive LOW Power range (Sensitivity) - Sub-carrier OSNR robustness - Max-pol-power-difference - Max-pol-skew-difference - Max-inter-carrier-skew - Sub-carrier OSNR Figure 3: Multi carrier Transceiver 6. Security Considerations LMP message security uses IPsec, as described in [RFC4204]. This document only defines new LMP objects that are carried in existing LMP messages, similar to the LMP objects in [RFC:4209]. This document does not introduce new security considerations. 7. IANA Considerations LMP defines the following name spaces and the ways in which IANA can make assignments to these namespaces: - LMP Message Type - LMP Object Class - LMP Object Class type (C-Type) unique within the Object Class - LMP Sub-object Class type (Type) unique within the Object Class This memo introduces the following new assignments: LMP Sub-Object Class names: under DATA_LINK Class name (as defined in ) - Multi carrier Transceiver (sub-object Type = TBA) 8. Contributors Zafar Ali Cisco 3000 Innovation Drive KANATA ONTARIO K2K 3E8 zali@cisco.com 9. References 9.1. Normative References Hiremagalur, et al. Expires 26 January 2024 [Page 7] Internet-Draft draft-ggalimbe-ccamp-flex-if-lmp-16 July 2023 [RFC4204] Lang, J., Ed., "Link Management Protocol (LMP)", RFC 4204, DOI 10.17487/RFC4204, October 2005, . [RFC4209] Fredette, A., Ed. and J. Lang, Ed., "Link Management Protocol (LMP) for Dense Wavelength Division Multiplexing (DWDM) Optical Line Systems", RFC 4209, DOI 10.17487/RFC4209, October 2005, . [RFC6205] Otani, T., Ed. and D. Li, Ed., "Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers", RFC 6205, DOI 10.17487/RFC6205, March 2011, . [ITU.G698.2] International Telecommunications Union, "Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces", ITU-T Recommendation G.698.2, November 2009. [ITU.G694.1] International Telecommunications Union, ""Spectral grids for WDM applications: DWDM frequency grid"", ITU-T Recommendation G.698.2, February 2012. [ITU.G709] International Telecommunications Union, "Interface for the Optical Transport Network (OTN)", ITU-T Recommendation G.709, June 2016. [ITU.G872] International Telecommunications Union, "Architecture of optical transport networks", ITU-T Recommendation G.872, January 2017. [ITU.G874.1] International Telecommunications Union, "Optical transport network (OTN): Protocol-neutral management information model for the network element view", ITU-T Recommendation G.874.1, November 2016. 9.2. Informative References [RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, DOI 10.17487/RFC3410, December 2002, . Hiremagalur, et al. Expires 26 January 2024 [Page 8] Internet-Draft draft-ggalimbe-ccamp-flex-if-lmp-16 July 2023 [RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629, DOI 10.17487/RFC2629, June 1999, . [RFC4181] Heard, C., Ed., "Guidelines for Authors and Reviewers of MIB Documents", BCP 111, RFC 4181, DOI 10.17487/RFC4181, September 2005, . Authors' Addresses Dharini Hiremagalur (editor) Juniper 1194 N Mathilda Avenue Sunnyvale - 94089 California, United States of America Phone: +1408 Email: dharinih@juniper.net Gert Grammel (editor) Juniper Oskar-Schlemmer Str. 15 80807 Muenchen Germany Phone: +49 1725186386 Email: ggrammel@juniper.net Gabriele Galimberti (editor) Cisco Via S. Maria Molgora, 48 c 20871 - Vimercate Italy Phone: +390392091462 Email: ggalimbe56@gmail.com Ruediger Kunze (editor) Deutsche Telekom Winterfeldtstr. 21-27 10781 Berlin Germany Phone: +491702275321 Email: RKunze@telekom.de Hiremagalur, et al. Expires 26 January 2024 [Page 9]