Network Working Group Iftekhar Hussain Internet Draft Marco Sosa Intended status: Standard Track Infinera Expires: April 2014 Abinder Dhillon Fujitsu Network Communications October 8, 2013 Super-Channel Optical Parameters GMPLS Routing Extensions draft-hussain-ccamp-super-channel-param-ospfte-03.txt Abstract This document builds on [6][7] and defines GMPLS routing extensions to allow added CSPF constraints for efficient super-channel spectrum assignment on flexible grid networks. 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), 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 Hussain Expires April 2014 [Page 1] Internet-Draft Super-Channel Parameters Routing Extensions October 2013 The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on April 8, 2014. Copyright Notice Copyright (c) 2013 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..................................................23 2. Terminology....................................................3 3. GMPLS Routing Extensions for Super-Channel Optical Parameters.34 3.1. Super-Channel In-Use Slices sub-TLV......................45 3.2. Super-Channel Carriers sub-TLV............................5 4. Procedure for OSPF-TE Advertisement...........................56 5. Possible Applications..........................................6 6. TLV Encoding Examples..........................................6 7. Security Considerations.......................................67 8. IANA Considerations...........................................67 9. References.....................................................7 9.1. Normative References......................................7 9.2. Informative References....................................7 10. Acknowledgments...............................................8 1. Introduction Future transport systems are expected to support service upgrades to data rates of 1 Tbps and beyond. To scale networks beyond 100Gbps, multi-carrier super-channels coupled with advanced multi-level modulation formats and flexible channel spectrum bandwidth Hussain Expires April 2014 [Page 2] Internet-Draft Super-Channel Parameters Routing Extensions October 2013 allocation schemes have become pivotal for future spectral efficient transport network architectures [1,2]. The coexistence of super-channels using different modulation formats on the same optical fiber network infrastructure may have a detrimental effect on the Optical Signal to Noise Ratio (OSNR) of adjacent super-channels due to interference such as cross-phase modulation. Therefore, it may be highly desirable to be able to evaluate the mutual impact of the existing and new super-channels on each other's quality of transmission (e.g., bit error rate) before establishing new super-channels. The document [9] defines GMPLS signaling extensions to convey super- channel optical parameters. This document defines GMPLS routing extensions to advertise the above mentioned super-channel parameters via OSPF-TE link LSA using new Super-Channel sub-TLV. This sub-TLV is carried under the Switching Capability-specific information (SCSI) field of the Interface Switching Capability Descriptor (ISCD) with the Super-Channel-Switch-Capable (SCSC) value defined in [6]. This information allows each source node across the network to apply added CSPF constraints and assign new super-channels spectrum efficiently by considering not only the availability of the required number of slices but also the optical signal compatibility of the existing and the new super-channels along the desired path. 2. Terminology 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]. 3. GMPLS Routing Extensions for Super-Channel Optical Parameters This document defines OSPF-TE extensions for advertising following information using the Super-Channel sub-TLV depicted in Figure 1. For each super-channel this sub-TLV advertises following information: o Super-Channel In-Use Slices sub-TLV o Super-Channel Carriers sub-TLV 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 Hussain Expires April 2014 [Page 3] Internet-Draft Super-Channel Parameters Routing Extensions October 2013 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | TLV Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ~ ~ Super-Channel 1 In-Use Slices sub-TLV ~ ~ ~ ~ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ~ ~ Super-Channel 1 Carriers TLV sub-TLV ~ ~ ~ ~ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ~ ~ More entries ~ ~ ~ ~ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ~ ~ Super-Channel n In-Use Slices TLV sub-TLV ~ ~ ~ ~ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ~ ~ Super-Channel n Carriers TLV sub-TLV ~ ~ ~ ~ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 1: Super-Channel TLV Format. The Super-Channel sub-TLV is advertised in the OSPF-TE link LSA under the under the SCSI field of the ISCD using Super-Channel- Switch-Capable (SCSC) value defined in [6] 3.1. Super-Channel In-Use Slices sub-TLV This sub-TLV contains the in-use slices information of a super- channel. For further information about various fields in this sub- TLV refer to [6][7]. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Hussain Expires April 2014 [Page 4] Internet-Draft Super-Channel Parameters Routing Extensions October 2013 | TLV Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Super-Channel Id |Grid | S.S. | PRI | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | n_start_1 (spectral slot 1) | n_end_1 (spectral slot 1) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | n_start_2 (spectral slot 2) | n_end_2 (spectral slot 2) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ~ ~ More entries ~ ~ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | n_start_n (spectral slot n) | n_end_n (spectral slot n) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 2: Super-Channel In-Use Slices sub-TLV Format. [Editor's Note: encoding of in-use slices in bitmap format is left for a possible future revision] 3.2. Super-Channel Carriers sub-TLV The format of the Super-Channel Carriers sub-TLV is defined in [9]. In summary, this sub-TLV contains following information. o Number of Carriers in the Super-Channel o Carrier sub-TLV o Carrier Center Frequency sub-sub-TLV o Carrier Modulation sub-sub-TLV o Carrier FEC sub-sub-TLV 4. Procedure for OSPF-TE Advertisement This section describes procedure for advertising the aforementioned information in the OSPF-TE link LSAs. o The optical parameters of the super-channel are signaled when new super-channels are established (see [9]). Hussain Expires April 2014 [Page 5] Internet-Draft Super-Channel Parameters Routing Extensions October 2013 o Over time change in the status of in-use slices occurs when new super-channels are setup (or when established super-channels are released). o Each node along the path traversed by the super-channels advertises the current status of the in-use slices for each super-channel in the OSPF-TE link LSA using sub-TLVs described earlier. o Through OSPF-TE LSAs flooding other nodes in the routing domain learn about the current status of in-use slices on each TE link. 5. Possible Applications o The presence of this information across the network topology enables source nodes in the network to apply added CSPF constraints for example to: o Group super-channels with different modulation formats in different bands (slice ranges) o Group super-channels with same bit-rate in a band while separating with guard band from super-channels with different bit-rate. o Allows efficient network utilization (e.g., reduces new requests blocking probability) by avoiding excessive worst-case OSNR penalty while preserving desired quality of transmission of the existing super-channels 6. TLV Encoding Examples To be added later. 7. Security Considerations 8. IANA Considerations IANA needs to assign a new Grid field value to represent ITU-T Flex- Grid. Hussain Expires April 2014 [Page 6] Internet-Draft Super-Channel Parameters Routing Extensions October 2013 9. References 9.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC3471] Berger, L., Ed., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3471, January 2003. [RFC6205] Otani, T., Ed., "Generalized Labels for Lambda-Switch- Capable (LSC) Label Switching Routers", RFC 6205, March 2011. [RFC6163] Lee, Y., Ed., "Framework for GMPLS and Path Computation Element (PCE) Control of Wavelength Switched Optical Networks (WSONs)", RFC 6163, April 2011 9.2. Informative References [1] Gringeri, S., Basch, B. Shukla,V. Egorov, R. and Tiejun J. Xia, "Flexible Architectures for Optical Transport Nodes and Networks", IEEE Communications Magazine, July 2010, pp. 40-50 [2] M. Jinno et. al., "Spectrum-Efficient and Scalable Elastic Optical Path Network: Architecture, Benefits and Enabling Technologies", IEEE Comm. Mag., Nov. 2009, pp. 66-73. [3] S. Chandrasekhar and X. Liu, "Terabit Super-Channels for High Spectral Efficiency Transmission",in Proc. ECOC 2010, paper Tu.3.C.5, Torino (Italy), September 2010. [4] ITU-T Recommendation G.694.1, "Spectral grids for WDM applications: DWDM frequency grid", June 2002 [5] [4] "Finisar to Demonstrate Flexgrid(TM) WSS Technology at ECOC 2010", press release. [6] Abinder D., et.al., "OSPFTE extension to support GMPLS for Flex Grid", draft-dhillon-ccamp-super-channel-ospfte-ext, work in progress, November 2011. [7] Iftekhar H., et.al., "Generalized Label for Super-Channel Assignment on Flexible Grid", draft-hussain-ccamp-super- channel-label, work in progress, October 2011. Hussain Expires April 2014 [Page 7] Internet-Draft Super-Channel Parameters Routing Extensions October 2013 [8] G. Bernstein, et.al., "Routing and Wavelength Assignment Information Encoding for Wavelength Switched Optical Networks", draft-ietf-ccamp-rwa-wson-encode, work in progress, October 2011. [9] Iftekhar H., et.al., "Super-Channel Optical Parameters GMPLS Signaling Extensions", draft-hussain-ccamp-super-channel- param-sig, work in progress, March 2012. 10. Acknowledgments Hussain Expires April 2014 [Page 8] Internet-Draft Super-Channel Parameters Routing Extensions October 2013 Authors' Addresses Iftekhar Hussain Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: ihussain@infinera.com Marco Sosa Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: msosa@infinera.com Abinder Dhillon Fujitsu Network Communications 2801 Telecom Parkway, Richardson, TX 75082 Email: abinder.dhillon@us.fujitsu.com Hussain Expires April 2014 [Page 9] Internet-Draft Super-Channel Parameters Routing Extensions October 2013 Contributor's Addresses Rajan Rao Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: rrao@infinera.com Biao Lu Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: blu@infinera.com Subhendu Chattopadhyay Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: schattopadhyay@infinera.com Harpreet Uppal Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: harpreet.uppal@infinera.com Vinayak Dangui Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: vdangui@infinera.com Michael VanLeeuwen Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: MVanleeuwen@infinera.com Zhong Pan Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: zpan@infinera.com Hussain Expires April 2014 [Page 10]