Internet Engineering Task Force G. Galimberti, Ed. Internet-Draft D. La Fauci Intended status: Informational Cisco Expires: December 31, 2017 A. Zanardi, Ed. L. Galvagni FBK-CreateNet June 29, 2017 Signaling extensions for Media Channel sub-carriers configuration in Spectrum Switched Optical Networks (SSON) in Lambda Switch Capable (LSC) Optical Line Systems. draft-ggalimbe-ccamp-flexigrid-carrier-label-01 Abstract This memo defines the signaling extensions for managing Spectrum Switched Optical Network (SSON) parameters shared between the Client and the Network and inside the Network in accordance to the model described in RFC 7698. The extensions are in accordance and extending the parameters defined in ITU-T Recommendation G.694.1.[ITU.G694.1] and its extensions and G.872.[ITU.G872]. 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 http://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 December 31, 2017. Galimberti, et al. Expires December 31, 2017 [Page 1] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 Copyright Notice Copyright (c) 2017 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 2. Client interface parameters . . . . . . . . . . . . . . . . . 3 3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4. Signalling Extensions . . . . . . . . . . . . . . . . . . . . 5 4.1. New LSP set-up parameters . . . . . . . . . . . . . . . . 5 4.2. Extension to LSP set-up reservation . . . . . . . . . . . 6 4.3. RSVP Protocol Extensions considerations . . . . . . . . . 9 5. Security Considerations . . . . . . . . . . . . . . . . . . . 9 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9 7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 9 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 9 8.1. Normative References . . . . . . . . . . . . . . . . . . 9 8.2. Informative References . . . . . . . . . . . . . . . . . 11 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11 1. Introduction Generalised Multiprotocol Label Switched (GMPLS) is widely used in Wavelength Switched Optical Network (WSON) to support the optical circuits set-up through the signalling between Core Nodes and Edge Nodes. This extension addresses the use cases described by [RFC7698] Ch.3.3 and supports the information, needed in Spectrum Switched Optical Network (SSON), to signal a Media Channel and the associated carriers set request. The new set of parameters is related to the Media Channel and the carrier(s) routed with it and keep the backward compatibility with the WSON signalling. In particular this memo wants do address the use cases where the SSON LSP (the Media Channel in RFC7698) carries multiple carrier (OTSi) containing same Payload. The set of the carriers can be seen as single Logical circuit. This memo can be considered as the extension of [RFC7792]. The contents Galimberti, et al. Expires December 31, 2017 [Page 2] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 and the parameters reflect the experimental activity on IP over SSON recently done by some vendors and research consortia. Figure 1 shows how the multiple carrier are mapped into a Media Channel. A set of parameters must be shared on the UNI to allow the GMPLS to do the proper routing and Spectrum Assignment and decide the carrier position. +------+ +------+ _________ +------+ +------+ | E.N. | | C.N. | / /\ | C.N. | | E.N. | | OTS1| ----- | || | || | ----- |OTS1 | ==| OTS2| ----- | || Media | || | ----- |OTS2 |== ==| OTS3| ----- | || Channel| || | ----- |OTS3 |== | OTS4| ----- | || | || | ----- |OTS4 | | | | ROADM| \________\/ | ROADM| | | +------+ +------+ +------+ +------+ ^ ^ ^ ^ | | | | +---UNI---+ +---UNI---+ E.N. = Edge Node - UNI Client C.N. = Core Node - UNI Network ROADM = Lambda/Spectrum switch Media Channel = the optical circuit OTSi = Carriers belonging to the same Network Media Channel (or Super Channel) UNI = Signallig interface from Fig. 5.1/G.698.2 Figure 1: Multi carrier LSP 2. Client interface parameters The Edge Node interface can have one or multiple carriers (OTSi). All the carrier have the same characteristics and are provisionable in terms of: Number of subcarriers: This parameter indicates the number of subcarriers available for the super-channel in case the Transceiver can support multiple carrier circuits. Central frequency (see G.694.1 Table 1): Galimberti, et al. Expires December 31, 2017 [Page 3] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 This parameter indicates the Central frequency value that Ss and Rs will be set to work (in THz). See the details in Section 6/ G.694.1 or based on "n" value explanation and the following "k" values definition in case of multicarrier transceivers. Central frequency granularity: This parameter indicates the Central frequency granularity supported by the transceiver, this value is combined with k and n value to calculate the central frequency of the carrier or sub- carriers. Minimum channel spacing: This is the minimum nominal difference in frequency (in GHz) between two adjacent channels (or carriers) depending on the Transceiver characteristics. Bit rate / Baud rate of optical tributary signals: Optical Tributary Signal bit (for NRZ signals) rate or Symbol (for Multiple bit per symbol) rate . FEC Coding: This parameter indicate what Forward Error Correction (FEC) code is used at Ss and Rs (R/W) (not mentioned in G.698.2). . Wavelength Range (see G.694.1): [ITU.G694.1] This parameter indicate minimum and maximum wavelength spectrum in a definite wavelength Band (L, C and S). Modulation format: This parameter indicates the list of supported Modulation Formats and the provisioned Modulation Format.. Inter carrier skew: This parameter indicates, in case of multi-carrier transceivers the maximum skew between the sub-carriers supported by the transceiver. Laser Output power: This parameter provisions the Transceiver Output power, it can be either a setting and measured value. receiver input power: This parameter provisions the Min and MAX input pover suppotred by the Transceiver, i.e. Receiver Sensitivity. The above parameters are related to the Edge Node Transceiver and are used by the Core Network GMPLS in order to calculate the optical feasibility and the spectrum allocation. The parameters can be Galimberti, et al. Expires December 31, 2017 [Page 4] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 shared between the Client and the Network via LMP or provisioned in the Network by an EMS or an operator OSS. 3. Use Cases The use cases are described in draft-ietf-ccamp-dwdm-if-mng-ctrl-fwk and [RFC7698] 4. Signalling Extensions Some of the above parameters can be applied to RFC7699 (SENDER_TSPEC/ FLOWSPEC). The above parameters could be applied to [RFC4208] scenarios but they are valid also in case of non UNI scenarios. The [RFC6205] parameters remain valid. 4.1. New LSP set-up parameters When the E.N. wants to request to the C.N. a new circuit set-up request or the GMPLS want to signal in the SSON network the Optical Interface characteristics the following parameters will be provided to the C.N.: Number of available subcarriers (c): This parameter is an integer. Total bandwidth request: e.g. 200Gb, 400Gb, 1Tb Policy (strict/loose): Strict/loose referred to B/W and subcarrier number. Subcarrier bandwidth tunability: (optional) e.g. 34Ghz, 48GHz. Galimberti, et al. Expires December 31, 2017 [Page 5] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 Figure 2: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |S|B| Number of Carriers | Client bandwidth | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Subcarrier frequency tunability (optional) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Sub-Transponder Mod Format: In the Value Field (96 bits) it is specified S strict number of subcarrier (No = 0, Yes = 1) B strict client bandwidth (No = 0, Yes = 1) - Num Carriers - Client bandwidth (100Gb, 150Gb, 200Gb, 400Gb, 1Tb, etc) - Subcarrier frequency tunability (optional) Figure 2: SSON LSP set-up request 4.2. Extension to LSP set-up reservation Once the GMPLS has calculated the Media Channel path, the Spectrum Allocation, the Sub-carrier number and frequency, the modulation format, the FEC and the Transmit power, sends back to the E.N. the path set-up confirmation providing the values of the calculated paramenters: Media Channel: (Grid, C.S., Identifier m and n). List of subcarriers: This parameter indicates the subcarriers to be used for the super- channel in case the Transceiver can support multiple carrier Circuits. Central frequency (see G.694.1 Table 1): Grid, Identifiers, central frequency and granularity. Central frequency granularity: This parameter indicates the Central frequency granularity supported by the transceiver, this value is combined with K and n value to calculate the central frequency on the carrier or sub- carriers. Bit rate / Baud rate of optical tributary signals: Galimberti, et al. Expires December 31, 2017 [Page 6] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 Optical tributary signal bit (for NRZ signals) rate or Symbol (for Multiple bit per symbol) rate. FEC Coding: This parameter indicate what Forward Error Correction (FEC) code must be used by the Transceivers (not mentioned in G.698). . Modulation format: This parameter indicates the Modulation Formats to be set in the Transceivers. Laser Output power: This parameter provisions the Transceiver Output power, it can be either a setting and measured value. Circuit Path, RRO, etc: All these info are defined in [RFC4208]. Path Error: e.g. no path exist, all the path error defined in [RFC4208]. Figure 3: The format of 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |S|I| Modulation ID | FEC | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | baud rate (Symbol Rate) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Traffic Type - R: standardized format - I: input / output (1 / 0) - Modulation IDs: BPSK, DC DP BSPSK, QPSK, DP QPSK, 8QAM, 16QAM, 16QAM, 64QAM, Hybrid, etc. - FEC - Baud Rate: IEEE float in bauds/s Galimberti, et al. Expires December 31, 2017 [Page 7] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 For Each carrier inside the Media Channel the TLV is used: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Grid| carrier Identifier | j | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | k | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sub-carrier power | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Carrie set-up: - Media channel Grid +----------+---------+ | Grid | Value | +----------+---------+ |ITU-T Flex| 3 | +----------+---------+ - Sub carrier identifier field: sub-carrier identifier inside the mediachannel - J field: granularity of the channel spacing, can be a multiple of 0.01GHz. - default value is 0.1GHz. - K field: positive or negative integer (including 0) to multiply by J and identify the S.C. Position inside the Media Channel, J can be set at default value = 0.1GHz. - sub-carrier power: subcarrier output power to be set (optional ?) In summary S.C. Frequency = MC-C.F. (in THz) + K * J GHz m=8 +-------------------------------X------------------------------+ | | | | sub-carrier sub-carrier | | +----------X----------+ | +----------X----------+ | | | OTSi | | OTSi | | | | o | | | o | | | | | | | | | | -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 --+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+- | n=4 | K1 -236 | +236 k2 <------------------------ Media Channel -----------------------> Galimberti, et al. Expires December 31, 2017 [Page 8] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 Figure 3: OCh_General 4.3. RSVP Protocol Extensions considerations The additional information described in the draft, is related to the Media Channel supported traffic. It could be encoded as specific extensions of the SENDER_TSPEC/FLOW_SPEC object for Flexi-Grid networks (see [RFC7792]) 5. Security Considerations GMPLS message security uses IPsec, as described in xxxx. This document only defines new UNI objects that are carried in existing UNI messages, similar to the UNI objects in xxx. This document does not introduce new security considerations. 6. IANA Considerations T.B.D. 7. Contributors Antonello Bonfanti Cisco Via Santa Maria Molgora, 48 c 20871 - Vimercate (MB) Italy abonfant@cisco.com 8. References 8.1. Normative References [ITU.G694.1] International Telecommunications Union, ""Spectral grids for WDM applications: DWDM frequency grid"", ITU-T Recommendation G.698.2, February 2012. [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. Galimberti, et al. Expires December 31, 2017 [Page 9] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 [ITU.G709] International Telecommunications Union, "Interface for the Optical Transport Network (OTN)", ITU-T Recommendation G.709, February 2012. [ITU.G872] International Telecommunications Union, "Architecture of optical transport networks", ITU-T Recommendation G.872, October 2012. [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, October 2012. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC3473] Berger, L., Ed., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource ReserVation Protocol- Traffic Engineering (RSVP-TE) Extensions", RFC 3473, DOI 10.17487/RFC3473, January 2003, . [RFC3945] Mannie, E., Ed., "Generalized Multi-Protocol Label Switching (GMPLS) Architecture", RFC 3945, DOI 10.17487/RFC3945, October 2004, . [RFC4208] Swallow, G., Drake, J., Ishimatsu, H., and Y. Rekhter, "Generalized Multiprotocol Label Switching (GMPLS) User- Network Interface (UNI): Resource ReserVation Protocol- Traffic Engineering (RSVP-TE) Support for the Overlay Model", RFC 4208, DOI 10.17487/RFC4208, October 2005, . [RFC5920] Fang, L., Ed., "Security Framework for MPLS and GMPLS Networks", RFC 5920, DOI 10.17487/RFC5920, July 2010, . [RFC6163] Lee, Y., Ed., Bernstein, G., Ed., and W. Imajuku, "Framework for GMPLS and Path Computation Element (PCE) Control of Wavelength Switched Optical Networks (WSONs)", RFC 6163, DOI 10.17487/RFC6163, April 2011, . Galimberti, et al. Expires December 31, 2017 [Page 10] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 [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, . [RFC7698] Gonzalez de Dios, O., Ed., Casellas, R., Ed., Zhang, F., Fu, X., Ceccarelli, D., and I. Hussain, "Framework and Requirements for GMPLS-Based Control of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks", RFC 7698, DOI 10.17487/RFC7698, November 2015, . [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, . [RFC7792] Zhang, F., Zhang, X., Farrel, A., Gonzalez de Dios, O., and D. Ceccarelli, "RSVP-TE Signaling Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks", RFC 7792, DOI 10.17487/RFC7792, March 2016, . 8.2. Informative References [RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629, DOI 10.17487/RFC2629, June 1999, . [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, . [RFC4181] Heard, C., Ed., "Guidelines for Authors and Reviewers of MIB Documents", BCP 111, RFC 4181, DOI 10.17487/RFC4181, September 2005, . Authors' Addresses Galimberti, et al. Expires December 31, 2017 [Page 11] Internet-Drafdraft-ggalimbe-ccamp-flexigrid-carrier-label-01 June 2017 Gabriele Galimberti (editor) Cisco Via S. Maria Molgora, 48 c 20871 - Vimercate Italy Phone: +390392091462 Email: ggalimbe@cisco.com Domenico La Fauci Cisco Via S. Maria Molgora, 48 c 20871 - Vimercate Italy Phone: +390392091946 Email: dlafauci@cisco.com Andrea Zanardi (editor) FBK-CreateNet via alla Cascata 56/D 38123 Povo, Trento Italy Phone: +390461312450 Email: azanardi@fbk.eu Lorenzo Galvagni FBK-CreateNet via alla Cascata 56/D 38123 Povo, Trento Italy Phone: +390461312427 Email: lgalvagni@fbk.eu Galimberti, et al. Expires December 31, 2017 [Page 12]