Network Working Group Abinder Dhillon Iftekhar Hussain Rajan Rao Internet Draft Infinera Intended status: Standard Track October 24, 2011 Expires: April 24 2012 OSPFTE extension to support GMPLS for Flex Grid draft-dhillon-ccamp-super-channel-ospfte-ext-00.txt Abstract This document specifies the extension to TELINK LSA of OSPF routing protocol [RFC4203] [3] in support of GMPLS [1] for flex-grid networks [2]. 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 The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on April 24, 2012. Copyright Notice Copyright (c) 2011 IETF Trust and the persons identified as the document authors. All rights reserved. Dhillon Expires April 24, 2012 [Page 1] Internet-Draft Super-Channel-Switching-Cap October 2011 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. Terminology....................................................3 3. Interface Switching Capability Descriptor......................3 3.1. Switch Capability Specific Information ....................5 4. Security Considerations........................................5 5. IANA Considerations............................................5 6. References.....................................................5 6.1. Normative References......................................5 6.2. Informative References....................................6 7. Acknowledgments................................................6 1. Introduction To enable scaling of existing transport systems to ultra high data rates of 1 Tbps and beyond, next generation systems providing super- channel switching capability are currently being developed. To allow efficient allocation of optical spectral bandwidth for such high bit rate systems, International Telecommunication Union Telecommunication Standardization Sector (ITU-T) is extending the G.694.1 grid standard (termed ''Fixed-Grid'') to include flexible grid (termed ''Flex-Grid'') support. This document defines OSPF-TE extensions in support of flex-grid networks Figure-1 shows a network consisting of NEs with super channel switching capability. User can create super channel connections using GMPLS through these NEs. To create these super channel connection, system needs to model TELINKs [8][7]for routing which are capable of super channel switching and hence there is a need to extend the switching capability descriptor in TELINK for super channel switched network. Dhillon Expires April 24, 2012 [Page 2] Internet-Draft Super-Channel-Switching-Cap October 2011 +-------+ +-------+ +-------+ | SC | | SC | | SC | |Switch |.---Link ---> |Switch |<- Link----- ->|Switch | | A | | B | | C | +-------+ +-------+ +-------+ |<-- TE-Link -->| |<-- TE-Link -->| Figure 1: TE-Links 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. Interface Switching Capability Descriptor The Interface Switching Capability Descriptor describes switching capability of an interface [RFC 4202]. This document defines a new Switching Capability value for Flex Grid [G.694.1] as follows: Value Type ----- ---- 102 (TBA by IANA) Super-Channel-Switch-Capable(SCSC) Switching Capability and Encoding values MUST be used as follows: Switching Capability = SCSC Encoding Type = Lambda [as defined in RFC4328] The Interface Switching Capability Descriptor is a sub-TLV (of type 15) of the Link TLV. The length is the length of value field in octets. The format of the value field is as shown below: Dhillon Expires April 24, 2012 [Page 3] Internet-Draft Super-Channel-Switching-Cap October 2011 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Switching Cap | Encoding | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 3 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 5 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 6 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 7 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Switching Capability-specific information | | (variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Dhillon Expires April 24, 2012 [Page 4] Internet-Draft Super-Channel-Switching-Cap October 2011 3.1. Switch Capability Specific Information The technology specific part of the ISCD can include a variable number of sub-TLVs. We propose to include following sub-TLVs defined in [GEN-Encode] under SCSI field: 1) Available spectral slices (labels) 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Action | Num Labels | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Base Label | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Bit Map Word #1 (Lowest numerical labels) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Bit Map Word #N (Highest numerical labels) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 3: SCSI format 4. Security Considerations 5. IANA Considerations IANA needs to assign a new Grid field value to represent ITU-T Flex- Grid. 6. References 6.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. Dhillon Expires April 24, 2012 [Page 5] Internet-Draft Super-Channel-Switching-Cap October 2011 6.2. Informative References [1] Berger, L., Ed., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3471, January 2003 [2] Iftekhar H, Abinder , Zhong , Marco , ''Generalized Label for Super-Channel Assignment on Flexible Grid'', draft-hussain- ccamp-super-channel-label-00.txt, July 2011. [3] K. Kompella, Y., " OSPF Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)", RFC 4203, Oct 2005 [4] Lee, Y., Ed., "Framework for GMPLS and Path Computation Element (PCE) Control of Wavelength Switched Optical Networks (WSONs)", RFC 6163, April 2011 [5] 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. [6] 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. [7] ITU-T Recommendation G.694.1, "Spectral grids for WDM applications: DWDM frequency grid", June 2002 [8] A. Farrel, D King, ''Generalized Labels for the Flexi-Grid inLambda-Switch-Capable (LSC) Label Switching Routers'', Work in progress:draft-farrkingel-ccamp-flexigrid-lambda-label- 00.txt - - October 2011. [9] G. Bernstein, Y. Lee, D. Li, W. Imajuku, " General Network Element Constraint Encoding for GMPLS Controlled Networks", work in progress: draft-ietf-ccamp-general-constraint- encode-05, May 2011 7. Acknowledgments Dhillon Expires April 24, 2012 [Page 6] Internet-Draft Super-Channel-Switching-Cap October 2011 Authors' Addresses Abinder Dhillon Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: adhillon@infinera.com Iftekhar Hussain Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: ihussain@infinera.com Rajan Rao Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: rrao@infinera.com Dhillon Expires April 24, 2012 [Page 7] Internet-Draft Super-Channel-Switching-Cap October 2011 Contributor's Addresses Marco Sosa Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: msosa@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 Dhillon Expires April 24, 2012 [Page 8]