Network Working Group Y. Lee Internet Draft Huawei Intended status: Standards Track G. Bernstein Expires: August 2011 Grotto Networking February 28, 2011 OSPF Enhancement for Signal and Network Element Compatibility for Wavelength Switched Optical Networks draft-ietf-ccamp-wson-signal-compatibility-ospf-03.txt Status of this Memo This Internet-Draft is submitted to IETF 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." 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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. Abstract This document provides GMPLS OSPF routing enhancements to support signal compatibility constraints associated with WSON network elements. These routing enhancements are required in common optical or hybrid electro-optical networks where not all of the optical signals in the network are compatible with all network elements participating in the network. This compatibility constraint model is applicable to common optical or hybrid electro optical systems such as OEO switches, regenerators, and wavelength converters since such systems can be limited to processing only certain types of WSON signals. Conventions used in this document 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]. Table of Contents 1. Introduction...................................................3 1.1. Revision History..........................................3 2. The Optical Node Property TLV..................................3 2.1. Sub-TLV Details...........................................4 2.1.1. Resource Block Information...........................4 2.1.2. Resource Block Accessibility.........................5 2.1.3. Resource Block Wavelength Constraints................5 2.1.4. Resource Block Pool State............................5 3. Security Considerations........................................6 4. IANA Considerations............................................6 5. References.....................................................8 5.1. Normative References......................................8 Lee and Bernstein Expires August 28, 2011 [Page 2] Internet-Draft OSPF Enhancement for WSON Signal Compatibility February 2011 6. Contributors...................................................9 Authors' Addresses................................................9 Intellectual Property Statement..................................10 Disclaimer of Validity...........................................10 1. Introduction The documents [WSON-Frame, WSON-Info, RWA-Encode] explain how to extend the wavelength switched optical network (WSON) control plane to allow both multiple WSON signal types and common hybrid electro optical systems as well hybrid systems containing optical switching and electro-optical resources. In WSON, not all of the optical signals in the network are compatible with all network elements participating in the network. Therefore, signal compatibility is an important constraint in path computation in a WSON. This document provides GMPLS OSPF routing enhancements to support signal compatibility constraints associated with general WSON network elements. These routing enhancements are required in common optical or hybrid electro-optical networks where not all of the optical signals in the network are compatible with all network elements participating in the network. This compatibility constraint model is applicable to common optical or hybrid electro optical systems such as OEO switches, regenerators, and wavelength converters since such systems can be limited to processing only certain types of WSON signals. 1.1. Revision History From 00 to 01: The details of the encodings for compatibility moved from this document to [RWA_Encode]. From 01 to 02: Editorial changes. From 02 to 03: Add a new Top Level Node TLV, Optical Node Property TLV to carry WSON specific node information. 2. The Optical Node Property TLV [RFC 3630] defines OSPF TE LSA using an opaque LSA. This document adds a new top level TLV for use in the OSPF TE LSA: the Optical Node Property TLV. Lee and Bernstein Expires August 28, 2011 [Page 3] Internet-Draft OSPF Enhancement for WSON Signal Compatibility February 2011 The Optical Node Property TLV contains all WSON-specific node properties and signal compatibility constraints. The detailed encodings of these properties are defined in [RWA-Encode]. The following sub-TLVs of the Optical Node Property TLV are defined: Value Length Sub-TLV Type TBA variable Resource Block Information TBA variable Resource Block Accessibility TBA variable Resource Block Wavelength Constraints TBA variable Resource Block Pool State The detail encodings of these sub-TLVs are found in [RWA-Encode] as indicated in the table below. Sub-TLV Type Section[RWA-Encode] Resource Block Information 5.1 Resource Block Accessibility 4.1 Resource Block Wavelength Constraints 4.2 Resource Block Pool State 4.3 2.1. Sub-TLV Details Among the sub-TLVs defined above, the Resource Block Pool State sub- TLV is dynamic in nature while the rest are static. As such, it will be separated out from the rest and make use of multiple TE LSA instances per source, per [RFC3630] multiple instance capability. 2.1.1. Resource Block Information Resource Block Information sub-TLVs are used to convey relatively static information about individual resource blocks including the resource block properties and the number of resources in a block. There are seven nested sub-TLVs defined in the Resource Block Information sub-TLV. Value Length Sub-TLV Type TBA variable Input Modulation Format List TBA variable Input FEC Type List TBA variable Input Bit Range List Lee and Bernstein Expires August 28, 2011 [Page 4] Internet-Draft OSPF Enhancement for WSON Signal Compatibility February 2011 TBA variable Input Client Signal List TBA variable Processing Capability List TBA variable Output Modulation Format List TBA variable Output FEC Type List The detail encodings of these sub-TLVs are found in [RWA-Encode] as indicated in the table below. Name Section[RWA-Encode] Input Modulation Format List 5.2 Input FEC Type List 5.3 Input Bit Range List 5.4 Input Client Signal List 5.5 Processing Capability List 5.6 Output Modulation Format List 5.7 Output FEC Type List 5.8 2.1.2. Resource Block Accessibility This sub-TLV describes the structure of the resource pool in relation to the switching device. In particular it indicates the ability of an ingress port to reach a resource block and of a resource block to reach a particular egress port. 2.1.3. Resource Block Wavelength Constraints Resources, such as wavelength converters, etc., may have a limited input or output wavelength ranges. Additionally, due to the structure of the optical system not all wavelengths can necessarily reach or leave all the resources. Resource Block Wavelength Constraints sub- TLV describe these properties. 2.1.4. Resource Block Pool State This sub-TLV describes the usage state of a resource that can be encoded as either a list of 16 bit integer values or a bit map indicating whether a single resource is available or in use. This information can be relatively dynamic, i.e., can change when a connection is established or torn down. Lee and Bernstein Expires August 28, 2011 [Page 5] Internet-Draft OSPF Enhancement for WSON Signal Compatibility February 2011 3. Security Considerations This document does not introduce any further security issues other than those discussed in [RFC 3630], [RFC 4203]. 4. IANA Considerations This document introduces a new Top Level Node TLV (Optical Node Property TLV) under the OSPF TE LSA defined in [RFC 3630]. Value TLV Type TBA Optical Node Property IANA is to allocate a new TLV Type and its Value for this Top Level Node TLV. This document also introduces the following sub-TLVs associated with the Optical Node Property TLV as defined in Section 2.1 as follows: Value Length Sub-TLV Type TBA variable Resource Block Information TBA variable Resource Block Accessibility TBA variable Resource Block Wavelength Constraints TBA variable Resource Block Pool State IANA is to allocate new sub-TLV Types and their Values for these sub- TLVs defined under the Optical Node Property TLV. There are seven nested sub-TLVs defined in the Resource Block Information sub-TLV as follows: Value Length Sub-TLV Type TBA variable Input Modulation Format List TBA variable Input FEC Type List TBA variable Input Bit Range List TBA variable Input Client Signal List TBA variable Processing Capability List TBA variable Output Modulation Format List TBA variable Output FEC Type List Lee and Bernstein Expires August 28, 2011 [Page 6] Internet-Draft OSPF Enhancement for WSON Signal Compatibility February 2011 IANA is to allocate new Sub-TLV Types and their Values for these Sub- TLVs defined under the Resource Block Information Sub-TLV. Lee and Bernstein Expires August 28, 2011 [Page 7] Internet-Draft OSPF Enhancement for WSON Signal Compatibility February 2011 5. References 5.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC3471] Berger, L., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3471, January 2003. [RFC3630] Katz, D., Kompella, K., and Yeung, D., "Traffic Engineering (TE) Extensions to OSPF Version 2", RFC 3630, September 2003. [G.694.1] ITU-T Recommendation G.694.1, "Spectral grids for WDM applications: DWDM frequency grid", June, 2002. [RFC4202] Kompella, K., Ed., and Y. Rekhter, Ed., "Routing Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)", RFC 4202, October 2005 [RFC4203] Kompella, K., Ed., and Y. Rekhter, Ed., "OSPF Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)", RFC 4203, October 2005. [RFC4328] Papadimitriou, D., Ed., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Extensions for G.709 Optical Transport Networks Control", RFC 4328, January 2006. [RFC5307] Kompella, K., Ed., and Y. Rekhter, Ed., "IS-IS Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)", RFC 5307, October 2008. [OSPF-Node] R. Aggarwal and K. Kompella, "Advertising a Router's Local Addresses in OSPF TE Extensions", draft-ietf-ospf- te-node-addr, work in progress. [Lambda-Labels] T. Otani, H. Guo, K. Miyazaki, D. Caviglia, "Generalized Labels for G.694 Lambda-Switching Capable Label Switching Routers", draft-ietf-ccamp- gmpls-g-694-lambda-labels, work in progress. Lee and Bernstein Expires August 28, 2011 [Page 8] Internet-Draft OSPF Enhancement for WSON Signal Compatibility February 2011 [WSON-Frame] Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS and PCE Control of Wavelength Switched Optical Networks", draft-ietf-ccamp-rwa-WSON-Framework, work in progress. [WSON-Info] Y. Lee, G. Bernstein, D. Li, W. Imajuku, "Routing and Wavelength Assignment Information Model for Wavelength Switched Optical Networks", draft-ietf-ccamp-rwa-info work in progress. [RWA-Encode]G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and Wavelength Assignment Information Encoding for Wavelength Switched Optical Networks", draft-ietf- ccamp-rwa-wson-encode, work in progress. 6. Authors and Contributors Authors' Addresses Young Lee (ed.) Huawei Technologies 1700 Alma Drive, Suite 100 Plano, TX 75075 USA Phone: (972) 509-5599 (x2240) Email: ylee@huawei.com Lee and Bernstein Expires August 28, 2011 [Page 9] Internet-Draft OSPF Enhancement for WSON Signal Compatibility February 2011 Greg M. Bernstein (ed.) 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