Network Working Group G. Bernstein Internet Draft Grotto Networking Intended status: Standards Track Y. Lee Expires: April 2011 D. Li Huawei W. Imajuku NTT October 13, 2010 Routing and Wavelength Assignment Information Encoding for Wavelength Switched Optical Networks draft-ietf-ccamp-rwa-wson-encode-06.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 A wavelength switched optical network (WSON) requires that certain key information elements are made available to facilitate path computation and the establishment of label switching paths (LSPs). The information model described in "Routing and Wavelength Assignment Information for Wavelength Switched Optical Networks" shows what information is required at specific points in the WSON. Part of the WSON information model contains aspects that may be of general applicability to other technologies, while other parts are fairly specific to WSONs. This document provides efficient, protocol-agnostic encodings for the WSON specific information elements. It is intended that protocol- specific documents will reference this memo to describe how information is carried for specific uses. Such encodings can be used to extend GMPLS signaling and routing protocols. In addition these encodings could be used by other mechanisms to convey this same information to a path computation element (PCE). 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..........................................4 1.1.1. Changes from 00 draft................................4 1.1.2. Changes from 01 draft................................4 1.1.3. Changes from 02 draft................................5 Bernstein and Lee Expires April 13, 2011 [Page 2] Internet-Draft Wavelength Switched Optical Networks October 2010 1.1.4. Changes from 03 draft................................5 1.1.5. Changes from 04 draft................................5 1.1.6. Changes from 05 draft................................5 2. Terminology....................................................5 3. WSON Encoding Usage Recommendations............................6 3.1. WSON Node TLV.............................................6 3.2. WSON Dynamic Node TLV.....................................6 4. Resource Accessibility/Availability............................7 4.1. Block Accessibility Sub-TLV...............................8 4.2. Wavelength Constraints Sub-TLV...........................10 4.3. Block Pool State Sub-TLV.................................10 4.4. Block Shared Access Wavelength Availability sub-TLV......12 5. Resource Properties Encoding..................................13 5.1. Resource Block Information Sub-TLV.......................13 5.2. Input Modulation Format List Sub-Sub-TLV.................14 5.2.1. Modulation Format Field.............................15 5.3. Input FEC Type List Sub-Sub-TLV..........................16 5.3.1. FEC Type Field......................................17 5.4. Input Bit Range List Sub-Sub-TLV.........................19 5.4.1. Bit Range Field.....................................19 5.5. Input Client Signal List Sub-Sub-TLV.....................20 5.6. Processing Capability List Sub-Sub-TLV...................21 5.6.1. Processing Capabilities Field.......................21 5.7. Output Modulation Format List Sub-Sub-TLV................23 5.8. Output FEC Type List Sub-Sub-TLV.........................23 6. Security Considerations.......................................23 7. IANA Considerations...........................................24 8. Acknowledgments...............................................24 APPENDIX A: Encoding Examples....................................25 A.1. Wavelength Converter Accessibility Sub-TLV...............25 A.2. Wavelength Conversion Range Sub-TLV......................26 A.3. An OEO Switch with DWDM Optics...........................27 9. References....................................................31 9.1. Normative References.....................................31 9.2. Informative References...................................31 10. Contributors.................................................32 Authors' Addresses...............................................33 Intellectual Property Statement..................................34 Disclaimer of Validity...........................................34 1. Introduction A Wavelength Switched Optical Network (WSON) is a Wavelength Division Multiplexing (WDM) optical network in which switching is performed selectively based on the center wavelength of an optical signal. Bernstein and Lee Expires April 13, 2011 [Page 3] Internet-Draft Wavelength Switched Optical Networks October 2010 [WSON-Frame] describes a framework for Generalized Multiprotocol Label Switching (GMPLS) and Path Computation Element (PCE) control of a WSON. Based on this framework, [WSON-Info] describes an information model that specifies what information is needed at various points in a WSON in order to compute paths and establish Label Switched Paths (LSPs). This document provides efficient encodings of information needed by the routing and wavelength assignment (RWA) process in a WSON. Such encodings can be used to extend GMPLS signaling and routing protocols. In addition these encodings could be used by other mechanisms to convey this same information to a path computation element (PCE). Note that since these encodings are relatively efficient they can provide more accurate analysis of the control plane communications/processing load for WSONs looking to utilize a GMPLS control plane. Note that encodings of information needed by the routing and label assignment process applicable to general networks beyond WSON are addressed in a separate document [Gen-Encode]. 1.1. Revision History 1.1.1. Changes from 00 draft Edits to make consistent with update to [Otani], i.e., removal of sign bit. Clarification of TBD on connection matrix type and possibly numbering. New sections for wavelength converter pool encoding: Wavelength Converter Set Sub-TLV, Wavelength Converter Accessibility Sub-TLV, Wavelength Conversion Range Sub-TLV, WC Usage State Sub-TLV. Added optional wavelength converter pool TLVs to the composite node TLV. 1.1.2. Changes from 01 draft The encoding examples have been moved to an appendix. Classified and corrected information elements as either reusable fields or sub-TLVs. Updated Port Wavelength Restriction sub-TLV. Added available wavelength and shared backup wavelength sub-TLVs. Changed the title Bernstein and Lee Expires April 13, 2011 [Page 4] Internet-Draft Wavelength Switched Optical Networks October 2010 and scope of section 6 to recommendations since the higher level TLVs that this encoding will be used in is somewhat protocol specific. 1.1.3. Changes from 02 draft Removed inconsistent text concerning link local identifiers and the link set field. Added E bit to the Wavelength Converter Set Field. Added bidirectional connectivity matrix example. Added simple link set example. Edited examples for consistency. 1.1.4. Changes from 03 draft Removed encodings for general concepts to [Gen-Encode]. Added in WSON signal compatibility and processing capability information encoding. 1.1.5. Changes from 04 draft Added encodings to deal with access to resource blocks via shared fiber. 1.1.5. 1.1.6. Changes from 05 draft Revised the encoding for the "shared access" indicators to only use one bit each for ingress and egress. 2. Terminology CWDM: Coarse Wavelength Division Multiplexing. DWDM: Dense Wavelength Division Multiplexing. FOADM: Fixed Optical Add/Drop Multiplexer. ROADM: Reconfigurable Optical Add/Drop Multiplexer. A reduced port count wavelength selective switching element featuring ingress and egress line side ports as well as add/drop side ports. RWA: Routing and Wavelength Assignment. Wavelength Conversion. The process of converting an information bearing optical signal centered at a given wavelength to one with Bernstein and Lee Expires April 13, 2011 [Page 5] Internet-Draft Wavelength Switched Optical Networks October 2010 "equivalent" content centered at a different wavelength. Wavelength conversion can be implemented via an optical-electronic-optical (OEO) process or via a strictly optical process. WDM: Wavelength Division Multiplexing. Wavelength Switched Optical Network (WSON): A WDM based optical network in which switching is performed selectively based on the center wavelength of an optical signal. 3. WSON Encoding Usage Recommendations In this section we give recommendations of typical usage of the sub- TLVs and composite TLVs which are based on the high level information bundles of [WSON-Info]. 3.1. WSON Node TLV The WSON Node TLV would consist of the following list of sub-TLVs: ::= [Other GMPLS sub-TLVs] [][] Where ::= ... [...] [...] The encoding of structure and properties of a general resource pool utilizes a resource block info sub-TLV ( in section 5. ), an accessibility sub-TLV ( in section 4.1. ), and a resource pool wavelength constraint sub-TLV ( in section 4.2. ). 3.2. WSON Dynamic Node TLV If the protocol supports the separation of dynamic information from relatively static information then the wavelength converter pool state can be separated from the general Node TLV into a dynamic Node TLV as follows. ::= [][...] Where the resource pool state sub-TLV is defined in section 4.3. Note that currently the only dynamic information modeled Bernstein and Lee Expires April 13, 2011 [Page 6] Internet-Draft Wavelength Switched Optical Networks October 2010 with a node is associated with the status of the wavelength converter pool. 4. Resource Accessibility/Availability In this section we define the sub-TLVs for dealing with accessibility and availability of resource blocks. These include the ResourceBlockAccessibility, ResourceWaveConstraints, and RBPoolState sub-TLVs. All these sub-TLVs are concerned with sets of resources. In a WSON node that includes resource blocks (RB) we will want to denote subsets these blocks to efficiently describe common properties the blocks and to describe the structure, if non-trivial, of the resource pool. The RB Set field is defined in a similar manner to the label set concept of [RFC3471]. The information carried in a RB set field is defined by: 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 |E|C| Reserved | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Identifier 1 | RB Identifier 2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Identifier n-1 | RB Identifier n | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Action: 8 bits 0 - Inclusive List Indicates that the TLV contains one or more RB elements that are included in the list. 2 - Inclusive Range Indicates that the TLV contains a range of RBs. The object/TLV contains two WC elements. The first element indicates the start of the range. The second element indicates the end of the range. A value of zero indicates that there is no bound on the corresponding portion of the range. Bernstein and Lee Expires April 13, 2011 [Page 7] Internet-Draft Wavelength Switched Optical Networks October 2010 E (Even bit): Set to 0 denotes an odd number of RB identifiers in the list (last entry zero pad); Set to 1 denotes an even number of RB identifiers in the list (no zero padding). C (Connectivity bit): Set to 0 to denote fixed (possibly multi- cast) connectivity; Set to 1 to denote potential (switched) connectivity. Used in resource pool accessibility sub-TLV. Ignored elsewhere. Reserved: 6 bits This field is reserved. It MUST be set to zero on transmission and MUST be ignored on receipt. Length: 16 bits The total length of this field in bytes. RB Identifier: The RB identifier represents the ID of the resource block which is a 16 bit integer. 4.1. Block Accessibility Sub-TLV 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. This is the PoolIngressMatrix and PoolEgressMatrix of [WSON-Info]. The resource block accessibility sub-TLV is defined by: Bernstein and Lee Expires April 13, 2011 [Page 8] Internet-Draft Wavelength Switched Optical Networks October 2010 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Connectivity | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Ingress Link Set Field A #1 | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Set Field A #1 | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Additional Link set and RB set pairs as needed to | : specify PoolIngressMatrix : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Egress Link Set Field B #1 | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Set B Field #1 (for egress connectivity) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Additional Link Set and RB set pairs as needed to | : specify PoolEgressMatrix : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where Connectivity indicates how the ingress/egress ports connect to the resource blocks. 0 -- the device is fixed (e.g. a connected port must go through the resource block) 1 -- the device is switched(e.g., a port can be configured to go through a resource but isn't required ) The Link Set Field is defined in [Gen-Encode]. Note that the direction parameter within the Link Set Field is used to indicate whether the link set is an ingress or egress link set, and the bidirectional value for this parameter is not permitted in this sub-TLV. See Appendix A.1 for an illustration of this encoding. Bernstein and Lee Expires April 13, 2011 [Page 9] Internet-Draft Wavelength Switched Optical Networks October 2010 4.2. Wavelength Constraints Sub-TLV 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. These properties are described by using one or more resource wavelength restrictions sub-TLVs as defined below: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Set Field | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Input Wavelength Set Field | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Output Wavelength Set Field | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ RB Set Field: A set of resource blocks (RBs) which have the same wavelength restrictions. Input Wavelength Set Field: Indicates the wavelength input restrictions of the RBs in the corresponding RB set. Output Wavelength Set Field: Indicates the wavelength output restrictions of RBs in the corresponding RB set. 4.3. Block Pool State Sub-TLV The usage state of a resource is 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. Bernstein and Lee Expires April 13, 2011 [Page 10] Internet-Draft Wavelength Switched Optical Networks October 2010 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 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Set Field | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Usage state | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where Action = 0 denotes a list of 16 bit integers and Action = 1 denotes a bit map. In both cases the elements of the RB Set field are in a one-to-one correspondence with the values in the usage RB usage state area. 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 = 0 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Set Field | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB#1 state | RB#2 state | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB#n-1 state | RB#n state or Padding | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Whether the last 16 bits is a wavelength converter (RB) state or padding is determined by the number of elements in the RB set field. 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 = 1 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Set Field | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Usage state bitmap | : : Bernstein and Lee Expires April 13, 2011 [Page 11] Internet-Draft Wavelength Switched Optical Networks October 2010 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ...... | Padding bits | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ RB Usage state: Variable Length but must be a multiple of 4 byes. Each bit indicates the usage status of one RB with 0 indicating the RB is available and 1 indicating the RB is in used. The sequence of the bit map is ordered according to the RB Set field with this sub- TLV. Padding bits: Variable Length 4.4. Block Shared Access Wavelength Availability sub-TLV Resources blocks may be accessed via a shared fiber. If this is the case then wavelength availability on these shared fiber is needed to understand resource availability. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Resource Block ID |I|E| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Ingress Available Wavelength Set Field | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Egress Available Wavelength Set Field | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Resource Block ID: The 16 bit integer used to identify a particular resource block. I bit: Indicates whether the ingress available wavelength set field is included (1) or not (0). E bit: Indicates whether the egress available wavelength set field is included (1) or not (0). Bernstein and Lee Expires April 13, 2011 [Page 12] Internet-Draft Wavelength Switched Optical Networks October 2010 Ingress Available Wavelength Set Field: Indicates the wavelengths currently available (not being used) on the ingress fiber to this resource block. Egress Available Wavelength Set Field: Indicates the wavelengths currently available (not being used) on the egress fiber from this resource block. 5. Resource Properties Encoding Within a WSON network element (NE) there may be resources with signal compatibility constraints. Such resources typically come in "blocks" which contain a group on identical and indistinguishable individual resources. These resource blocks may consist of regenerators, wavelength converters, etc... Such resource blocks may also constitute the network element as a whole as in the case of an electro optical switch. In this section we primarily focus on the signal compatibility and processing properties of such a resource block, i.e., of section 3.1. the accessibility aspects of a resource in a shared pool, except for the shared access indicators, were encoded in the previous section. The fundamental properties of a resource block, such as a regenerator or wavelength converter, are: (a)Input constraints (shared ingress, modulation, FEC, bit rate, GPID) (b)Processing capabilities (number of resources in a block, regeneration, performance monitoring, vendor specific) (c)Output Constraints (shared egress, modulation, FEC) 5.1. Resource Block Information Sub-TLV Resource Block descriptor sub-TLVs are used to convey relatively static information about individual resource blocks including the resource block properties of section 3. and the number of resources in a block. This sub-TLV has the following format: Bernstein and Lee Expires April 13, 2011 [Page 13] Internet-Draft Wavelength Switched Optical Networks October 2010 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Set Field | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |I|E| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Input Modulation Type List Sub-Sub-TLV (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Input FEC Type List Sub-Sub-TLV (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Input Client Signal Type Sub-TLV (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Input Bit Rate Range List Sub-Sub-TLV (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Processing Capabilities List Sub-Sub-TLV (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Output Modulation Type List Sub-Sub-TLV (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Output FEC Type List Sub-Sub-TLV (opt) | : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where I and E, the shared ingress/egress indicator, is set to 1 if the resource blocks identified in the RB set field utilized a shared fiber for ingress/egress access and set to 0 otherwise. 5.2. Input Modulation Format List Sub-Sub-TLV This sub-TLV contains a list of acceptable input modulation formats. Type := Input Modulation Format List Value:= A list of Modulation Format Fields Bernstein and Lee Expires April 13, 2011 [Page 14] Internet-Draft Wavelength Switched Optical Networks October 2010 5.2.1. Modulation Format Field Two different types of modulation format fields are defined: a standard modulation field and a vendor specific modulation field. Both start with the same 32 bit header shown below. 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 | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where S bit set to 1 indicates a standardized modulation format and S bit set to 0 indicates a vendor specific modulation format. The length is the length in bytes of the entire modulation type field. Where I bit set to 1 indicates it is an input modulation constraint and I bit set to 0 indicates it is an output modulation constraint. Note that if an output modulation is not specified then it is implied that it is the same as the input modulation. In such case, no modulation conversion is performed. The format for the standardized type for the input modulation is given by: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1| Modulation ID | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Possible additional modulation parameters depending upon | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : the modulation ID : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Modulation ID (S bit = 1); Input modulation (I bit = 1) Takes on the following currently defined values: 0 Reserved 1 optical tributary signal class NRZ 1.25G Bernstein and Lee Expires April 13, 2011 [Page 15] Internet-Draft Wavelength Switched Optical Networks October 2010 2 optical tributary signal class NRZ 2.5G 3 optical tributary signal class NRZ 10G 4 optical tributary signal class NRZ 40G 5 optical tributary signal class RZ 40G Note that future modulation types may require additional parameters in their characterization. The format for vendor specific modulation field (for input constraint) is given by: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|1| Vendor Modulation ID | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Enterprise Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : Any vendor specific additional modulation parameters : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor Modulation ID This is a vendor assigned identifier for the modulation type. Enterprise Number A unique identifier of an organization encoded as a 32-bit integer. Enterprise Numbers are assigned by IANA and managed through an IANA registry [RFC2578]. Vendor Specific Additional parameters There can be potentially additional parameters characterizing the vendor specific modulation. 5.3. Input FEC Type List Sub-Sub-TLV This sub-TLV contains a list of acceptable FEC types. Bernstein and Lee Expires April 13, 2011 [Page 16] Internet-Draft Wavelength Switched Optical Networks October 2010 Type := Input FEC Type field List Value:= A list of FEC type Fields 5.3.1. FEC Type Field The FEC type Field may consist of two different formats of fields: a standard FEC field or a vendor specific FEC field. Both start with the same 32 bit header shown below. 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| FEC ID | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Possible additional FEC parameters depending upon | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : the FEC ID : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where S bit set to 1 indicates a standardized FEC format and S bit set to 0 indicates a vendor specific FEC format. The length is the length in bytes of the entire FEC type field. Where I bit set to 1 indicates it is an input FEC constraint and I bit set to 0 indicates it is an output FEC constraint. Note that if an output FEC is not specified then it is implied that it is the same as the input FEC. In such case, no FEC conversion is performed. The length is the length in bytes of the entire FEC type field. The format for input standard FEC field is given by: Bernstein and Lee Expires April 13, 2011 [Page 17] Internet-Draft Wavelength Switched Optical Networks October 2010 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1| FEC ID | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Possible additional FEC parameters depending upon | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : the FEC ID : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Takes on the following currently defined values for the standard FEC ID: 0 Reserved 1 G.709 RS FEC 2 G.709V compliant Ultra FEC 3 G.975.1 Concatenated FEC (RS(255,239)/CSOC(n0/k0=7/6,J=8)) 4 G.975.1 Concatenated FEC (BCH(3860,3824)/BCH(2040,1930)) 5 G.975.1 Concatenated FEC (RS(1023,1007)/BCH(2407,1952)) 6 G.975.1 Concatenated FEC (RS(1901,1855)/Extended Hamming Product Code (512,502)X(510,500)) 7 G.975.1 LDPC Code 8 G.975.1 Concatenated FEC (Two orthogonally concatenated BCH codes) 9 G.975.1 RS(2720,2550) 10 G.975.1 Concatenated FEC (Two interleaved extended BCH (1020,988) codes) Where RS stands for Reed-Solomon and BCH for Bose-Chaudhuri- Hocquengham. The format for input vendor-specific FEC field is given by: Bernstein and Lee Expires April 13, 2011 [Page 18] Internet-Draft Wavelength Switched Optical Networks October 2010 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|1| Vendor FEC ID | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Enterprise Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : Any vendor specific additional FEC parameters : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Vendor FEC ID This is a vendor assigned identifier for the FEC type. Enterprise Number A unique identifier of an organization encoded as a 32-bit integer. Enterprise Numbers are assigned by IANA and managed through an IANA registry [RFC2578]. Vendor Specific Additional FEC parameters There can be potentially additional parameters characterizing the vendor specific FEC. 5.4. Input Bit Range List Sub-Sub-TLV This sub-TLV contains a list of acceptable input bit rate ranges. Type := Input Bit Range List Value:= A list of Bit Range Fields 5.4.1. Bit Range Field The bit rate range list sub-TLV makes use of the following bit rate range field: Bernstein and Lee Expires April 13, 2011 [Page 19] Internet-Draft Wavelength Switched Optical Networks October 2010 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Starting Bit Rate | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Ending Bit Rate | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ The starting and ending bit rates are given as 32 bit IEEE floating point numbers in bits per second. Note that the starting bit rate is less than or equal to the ending bit rate. The bit rate range list sub-TLV is then given by: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | +-+-+-+-+-+-+-+-+-+-+-+-+ Bit Range Field #1 +-+-+-+-+-+-+-+-+-+ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | +-+-+-+-+-+-+-+-+-+-+-+-+ Bit Range Field #M +-+-+-+-+-+-+-+-+-+ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5.5. Input Client Signal List Sub-Sub-TLV This sub-TLV contains a list of acceptable input client signal types. Type := Input Client Signal List Value:= A list of GPIDs The acceptable client signal list sub-TLV is a list of Generalized Protocol Identifiers (GPIDs). GPIDs are assigned by IANA and many are defined in [RFC3471] and [RFC4328]. Bernstein and Lee Expires April 13, 2011 [Page 20] Internet-Draft Wavelength Switched Optical Networks October 2010 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Number of GPIDs | GPID #1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : | : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | GPID #N | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where the number of GPIDs is an integer greater than or equal to one. 5.6. Processing Capability List Sub-Sub-TLV This sub-TLV contains a list of resource block processing capabilities. Type := Processing Capabilities List Value:= A list of Processing Capabilities Fields The processing capability list sub-TLV is a list of WSON network element (NE) that can perform signal processing functions including: 1. Number of Resources within the block 2. Regeneration capability 3. Fault and performance monitoring 4. Vendor Specific capability Note that the code points for Fault and performance monitoring and vendor specific capability are subject to further study. 5.6.1. Processing Capabilities Field The processing capability field is then given by: Bernstein and Lee Expires April 13, 2011 [Page 21] Internet-Draft Wavelength Switched Optical Networks October 2010 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Processing Cap ID | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Possible additional capability parameters depending upon | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : the processing ID : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ When the processing Cap ID is "number of resources" the format is simply: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Processing Cap ID | Length = 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Number of resources per block | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ When the processing Cap ID is "regeneration capability", the following additional capability parameters are provided in the 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | T | C | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where T bit indicates the type of regenerator: T=0: Reserved T=1: 1R Regenerator T=2: 2R Regenerator T=3: 3R Regenerator Where C bit indicates the capability of regenerator: Bernstein and Lee Expires April 13, 2011 [Page 22] Internet-Draft Wavelength Switched Optical Networks October 2010 C=0: Reserved C=1: Fixed Regeneration Point C=2: Selective Regeneration Point Note that when the capability of regenerator is indicated to be Selective Regeneration Pools, regeneration pool properties such as ingress and egress restrictions and availability need to be specified. This encoding is to be determined in the later revision. 5.7. Output Modulation Format List Sub-Sub-TLV This sub-TLV contains a list of available output modulation formats. Type := Output Modulation Format List Value:= A list of Modulation Format Fields 5.8. Output FEC Type List Sub-Sub-TLV This sub-TLV contains a list of output FEC types. Type := Output FEC Type field List Value:= A list of FEC type Fields 6. Security Considerations This document defines protocol-independent encodings for WSON information and does not introduce any security issues. However, other documents that make use of these encodings within protocol extensions need to consider the issues and risks associated with, inspection, interception, modification, or spoofing of any of this information. It is expected that any such documents will describe the necessary security measures to provide adequate protection. Bernstein and Lee Expires April 13, 2011 [Page 23] Internet-Draft Wavelength Switched Optical Networks October 2010 7. IANA Considerations TBD. Once our approach is finalized we may need identifiers for the various sub-sub-TLVs. 8. Acknowledgments This document was prepared using 2-Word-v2.0.template.dot. Bernstein and Lee Expires April 13, 2011 [Page 24] Internet-Draft Wavelength Switched Optical Networks October 2010 APPENDIX A: Encoding Examples A.1. Wavelength Converter Accessibility Sub-TLV Example: Figure 1 shows a wavelength converter pool architecture know as "shared per fiber". In this case the ingress and egress pool matrices are simply: +-----+ +-----+ | 1 1 | | 1 0 | WI =| |, WE =| | | 1 1 | | 0 1 | +-----+ +-----+ +-----------+ +------+ | |--------------------->| | | |--------------------->| C | /| | |--------------------->| o | /D+--->| |--------------------->| m | + e+--->| | | b |========> ========>| M| | Optical | +-----------+ | i | Port E1 Port I1 + u+--->| Switch | | WC Pool | | n | \x+--->| | | +-----+ | | e | \| | +----+->|WC #1|--+---->| r | | | | +-----+ | +------+ | | | | +------+ /| | | | +-----+ | | | /D+--->| +----+->|WC #2|--+---->| C | + e+--->| | | +-----+ | | o | ========>| M| | | +-----------+ | m |========> Port I2 + u+--->| | | b | Port E2 \x+--->| |--------------------->| i | \| | |--------------------->| n | | |--------------------->| e | | |--------------------->| r | +-----------+ +------+ Figure 1 An optical switch featuring a shared per fiber wavelength converter pool architecture. This wavelength converter pool can be encoded as follows: Bernstein and Lee Expires April 13, 2011 [Page 25] Internet-Draft Wavelength Switched Optical Networks October 2010 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Connectivity=1| Reserved | Note: I1,I2 can connect to either WC1 or WC2 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |0 1|0 0 0 0 0 0| Length = 12 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |1| Reserved | Length = 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB ID = #1 | RB ID = #2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Note: WC1 can only connect to E1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |0| Reserved | Length = 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB ID = #1 | zero padding | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |1 0|0 0 0 0 0 0| Length = 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Note: WC2 can only connect to E2 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |0| | Length = 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB ID = #2 | zero padding | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |1 0|0 0 0 0 0 0| Length = 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ A.2. Wavelength Conversion Range Sub-TLV Example: We give an example based on figure 1 about how to represent the wavelength conversion range of wavelength converters. Suppose the Bernstein and Lee Expires April 13, 2011 [Page 26] Internet-Draft Wavelength Switched Optical Networks October 2010 wavelength range of input and output of WC1 and WC2 are {L1, L2, L3, L4}: 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 Note: WC Set +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |1| Reserved | Length = 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | WC ID = #1 | WC ID = #2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Note: wavelength input range +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 2 | Num Wavelengths = 4 | Length = 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S. | Reserved | n for lowest frequency = 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Note: wavelength output range +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 2 | Num Wavelengths = 4 | Length = 8 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S. | Reserved | n for lowest frequency = 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ A.3. An OEO Switch with DWDM Optics In Figure 2 we show an electronic switch fabric surrounded by DWDM optics. In this example the electronic fabric can can handle either G.709 or SDH signals only (2.5 or 10 Gbps). To describe this node we have the potential information: ::= [Other GMPLS sub- TLVs][...] [][] In this case there is complete port to port connectivity so the is not required. In addition since there are sufficient ports to handle all wavelength signals we will not need the element. Hence our attention will be focused on the sub-TLV: ::= [...][...] Bernstein and Lee Expires April 13, 2011 [Page 27] Internet-Draft Wavelength Switched Optical Networks October 2010 /| +-----------+ +-------------+ +------+ /D+--->| +--->|Tunable Laser|-->| | + e+--->| | +-------------+ | C | ========>| M| | | ... | o |========> Port I1 + u+--->| | +-------------+ | m | Port E1 \x+--->| |--->|Tunable Laser|-->| b | \| | Electric | +-------------+ +------+ | Switch | /| | | +-------------+ +------+ /D+--->| +--->|Tunable Laser|-->| | + e+--->| | +-------------+ | C | ========>| M| | | ... | o |========> Port I2 + u+--->| | +-------------+ | m | Port E2 \x+--->| +--->|Tunable Laser|-->| b | \| | | +-------------+ +------+ | | /| | | +-------------+ +------+ /D+--->| |--->|Tunable Laser|-->| | + e+--->| | +-------------+ | C | ========>| M| | | ... | o |========> Port I3 + u+--->| | +-------------+ | m | Port E3 \x+--->| |--->|Tunable Laser|-->| b | \| +-----------+ +-------------+ +------+ Figure 2 An optical switch built around an electronic switching fabric. The resource block information will tell us about the processing constraints of the receivers, transmitters and the electronic switch. The resource availability information, although very simple, tells us that all signals must traverse the electronic fabric (fixed connectivity). The resource wavelength constraints are not needed since there are no special wavelength constraints for the resources that would not appear as port/wavelength constraints. : Bernstein and Lee Expires April 13, 2011 [Page 28] Internet-Draft Wavelength Switched Optical Networks October 2010 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Set Field | : (only one resource block in this example with shared | | input/output case) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|0| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Input Modulation Type List Sub-Sub-TLV | : (The receivers can only process NRZ) : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Input FEC Type List Sub-Sub-TLV | : (Only Standard SDH and G.709 FECs) : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Input Client Signal Type Sub-TLV | : (GPIDs for SDH and G.709) : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Input Bit Rate Range List Sub-Sub-TLV | : (2.5Gbps, 10Gbps) : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Processing Capabilities List Sub-Sub-TLV | : Fixed (non optional) 3R regeneration : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Output Modulation Type List Sub-Sub-TLV | : NRZ : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Output FEC Type List Sub-Sub-TLV | : Standard SDH, G.709 FECs : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Since we have fixed connectivity to resource block (the electronic switch) we get : Bernstein and Lee Expires April 13, 2011 [Page 29] Internet-Draft Wavelength Switched Optical Networks October 2010 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Connectivity=1|Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Ingress Link Set Field A #1 | : (All ingress links connect to resource) : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RB Set Field A #1 | : (trivial set only one resource block) : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Egress Link Set Field B #1 | : (All egress links connect to resource) : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Bernstein and Lee Expires April 13, 2011 [Page 30] Internet-Draft Wavelength Switched Optical Networks October 2010 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. [RFC2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC3471] Berger, L., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3471, January 2003. [RFC4328] Papadimitriou, D., Ed., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Extensions for G.709 Optical Transport Networks Control", RFC 4328, January 2006. [G.694.1] ITU-T Recommendation G.694.1, "Spectral grids for WDM applications: DWDM frequency grid", June, 2002. 9.2. Informative References [G.694.1] ITU-T Recommendation G.694.1, Spectral grids for WDM applications: DWDM frequency grid, June 2002. [G.694.2] ITU-T Recommendation G.694.2, Spectral grids for WDM applications: CWDM wavelength grid, December 2003. [Gen-Encode] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "General Network Element Constraint Encoding for GMPLS Controlled Networks", work in progress: draft-ietf-ccamp-general-ext- encode-00.txt. [Otani] T. Otani, H. Guo, K. Miyazaki, D. Caviglia, "Generalized Labels for G.694 Lambda-Switching Capable Label Switching Routers", work in progress: draft-ietf-ccamp-gmpls-g-694- lambda-labels. [WSON-Frame] Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS and PCE Control of Wavelength Switched Optical Networks", work in progress: draft-ietf-ccamp-wavelength-switched- framework, Marh 2009. Bernstein and Lee Expires April 13, 2011 [Page 31] Internet-Draft Wavelength Switched Optical Networks October 2010 [WSON-Info] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and Wavelength Assignment Information Model for Wavelength Switched Optical Networks", work in progress: draft-ietf- ccamp-rwa-info, March 2009. 10. Contributors Diego Caviglia Ericsson Via A. Negrone 1/A 16153 Genoa Italy Phone: +39 010 600 3736 Email: diego.caviglia@(marconi.com, ericsson.com) Anders Gavler Acreo AB Electrum 236 SE - 164 40 Kista Sweden Email: Anders.Gavler@acreo.se Jonas Martensson Acreo AB Electrum 236 SE - 164 40 Kista, Sweden Email: Jonas.Martensson@acreo.se Itaru Nishioka NEC Corp. 1753 Simonumabe, Nakahara-ku, Kawasaki, Kanagawa 211-8666 Japan Phone: +81 44 396 3287 Email: i-nishioka@cb.jp.nec.com Bernstein and Lee Expires April 13, 2011 [Page 32] Internet-Draft Wavelength Switched Optical Networks October 2010 Authors' Addresses Greg M. Bernstein (ed.) Grotto Networking Fremont California, USA Phone: (510) 573-2237 Email: gregb@grotto-networking.com Young Lee (ed.) Huawei Technologies 1700 Alma Drive, Suite 100 Plano, TX 75075 USA Phone: (972) 509-5599 (x2240) Email: ylee@huawei.com Dan Li Huawei Technologies Co., Ltd. F3-5-B R&D Center, Huawei Base, Bantian, Longgang District Shenzhen 518129 P.R.China Phone: +86-755-28973237 Email: danli@huawei.com Wataru Imajuku NTT Network Innovation Labs 1-1 Hikari-no-oka, Yokosuka, Kanagawa Japan Phone: +81-(46) 859-4315 Email: imajuku.wataru@lab.ntt.co.jp Bernstein and Lee Expires April 13, 2011 [Page 33] Internet-Draft Wavelength Switched Optical Networks October 2010 Jianrui Han Huawei Technologies Co., Ltd. F3-5-B R&D Center, Huawei Base, Bantian, Longgang District Shenzhen 518129 P.R.China Phone: +86-755-28972916 Email: hanjianrui@huawei.com Intellectual Property Statement The IETF Trust takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in any IETF Document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. 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Disclaimer of Validity All IETF Documents and the information contained therein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION THEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Bernstein and Lee Expires April 13, 2011 [Page 34] Internet-Draft Wavelength Switched Optical Networks October 2010 Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Bernstein and Lee Expires April 13, 2011 [Page 35]