Network Working Group G. Bernstein Internet Draft Grotto Networking Intended status: Standards Track Y. Lee Expires: May 2009 D. Li Huawei W. Imajuku NTT November 3, 2008 Routing and Wavelength Assignment Information Encoding for Wavelength Switched Optical Networks draft-bernstein-ccamp-wson-encode-01.txt Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of 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 May 3, 2007. Copyright Notice Copyright (C) The IETF Trust (2008). Bernstein and Lee Expires May 3, 2009 [Page 1] Internet-Draft Wavelength Switched Optical Networks November 2008 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. The information may be used in Generalized Multiprotocol Label Switching (GMPLS) signaling protocols, and may be distributed by GMSPL routing protocols. Other distribution mechanisms (for example, XML-based protocols) may also be used. This document provides efficient, protocol-agnostic encodings for the information elements necessary to operate a WSON. It is intended that protocol-specific documents will reference this memo to describe how information is carried for specific uses. 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 2. Terminology....................................................3 3. Encoding of WSON Information: Sub-TLVs.........................4 3.1. Link Set Sub-TLV..........................................4 3.2. Connectivity Matrix Sub-TLV...............................6 3.3. Wavelength Information Encoding...........................9 3.4. Wavelength Set Sub-TLV...................................10 3.4.1. Inclusive/Exclusive Wavelength Lists................10 3.4.2. Inclusive/Exclusive Wavelength Ranges...............11 3.4.3. Bitmap Wavelength Set...............................11 3.5. Port Wavelength Restriction sub-TLV......................13 4. Composite TLVs................................................14 4.1. WSON Node TLV............................................14 4.2. WSON Link TLV............................................14 4.3. WSON Dynamic Link TLV....................................15 4.4. WSON Dynamic Node TLV....................................16 5. Security Considerations.......................................16 6. IANA Considerations...........................................16 Bernstein and Lee Expires May 3, 2009 [Page 2] Internet-Draft Wavelength Switched Optical Networks November 2008 7. Acknowledgments...............................................16 8. References....................................................17 8.1. Normative References.....................................17 8.2. Informative References...................................17 9. Contributors..................................................19 Authors' Addresses...............................................19 Intellectual Property Statement..................................20 Disclaimer of Validity...........................................21 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. [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. 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 May 3, 2009 [Page 3] Internet-Draft Wavelength Switched Optical Networks November 2008 "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. Encoding of WSON Information: Sub-TLVs A TLV encoding of the high level WSON information model [WSON-Info] is given in the following sections. This encoding is designed to be suitable for use in the GMPLS routing protocols OSPF [RFC4203] and IS-IS [RFC5307] and in the PCE protocol PCEP [PCEP]. Note that the information distributed in [RFC4203] and [RFC5307] is arranged via the nesting of sub-TLVs within TLVs and this document makes use of such constructs. 3.1. Link Set Sub-TLV We will frequently need to describe properties of groups of links. To do so efficiently we can make use of a link set concept similar to the label set concept of [RFC3471]. All links will be denoted by their local link identifier as defined an used in [RFC4202], [RFC4203], and [RFC5307]. The information carried in a Link Set 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 |Dir| Format | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Identifier 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : : : : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Identifier N | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Action: 8 bits 0 - Inclusive List Bernstein and Lee Expires May 3, 2009 [Page 4] Internet-Draft Wavelength Switched Optical Networks November 2008 Indicates that the TLV contains one or more link elements that are included in the Link Set. 2 - Inclusive Range Indicates that the TLV contains a range of links. The object/TLV contains two link 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. Dir: Directionality of the Link Set (2 bits) 0 -- bidirectional 1 -- incoming 2 -- outgoing In optical networks we think in terms of unidirectional as well as bidirectional links. For example, wavelength restrictions or connectivity may be different for an ingress port, than for its "companion" egress port if one exists. Note that "interfaces" such as those discussed in the Interfaces MIB [RFC2863] are assumed to be bidirectional. This also applies to the links advertised in various link state routing protocols. Format: The format of the link identifier (6 bits) 0 -- Link Local Identifier Others TBD. Note that all link identifiers in the same list must be of the same type. Reserved: 16 bits This field is reserved. It MUST be set to zero on transmission and MUST be ignored on receipt. Link Identifier: The link identifier represents the port which is being described either for connectivity or wavelength restrictions. This can be the link local identifier of [RFC4202], GMPLS routing, [RFC4203] GMPLS OSPF routing, and [RFC5307] IS-IS GMPLS routing. The use of the link Bernstein and Lee Expires May 3, 2009 [Page 5] Internet-Draft Wavelength Switched Optical Networks November 2008 local identifier format can result in more compact WSON encodings when the assignments are done in a reasonable fashion. 3.2. Connectivity Matrix Sub-TLV The switch and fixed connectivity matrices of [WSON-Info] can be compactly represented in terms of a minimal list of ingress and egress port set pairs that have mutual connectivity. As described in [Switch] such a minimal list representation leads naturally to a graph representation for path computation purposes that involves the fewest additional nodes and links. A TLV encoding of this list of link set pairs is: 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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Set A #1 | : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Set B #1 : : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Additional Link set pairs as needed | : to specify connectivity : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where Connectivity = 0 if the device is fixed 1 if the device is switched(e.g., ROADM/OXC) TBD: Should we just have two sub-TLVs one for fixed one for switched? Example: Suppose we have a typical 2-degree 40 channel ROADM. In addition to its two line side ports it has 80 add and 80 drop ports. The picture below illustrates how a typical 2-degree ROADM system that works with bi-directional fiber pairs is a highly asymmetrical system composed of two unidirectional ROADM subsystems. Bernstein and Lee Expires May 3, 2009 [Page 6] Internet-Draft Wavelength Switched Optical Networks November 2008 (Tributary) Ports #3-#42 Ingress added to Egress dropped from West Line Egress East Line Ingress vvvvv ^^^^^ | |||.| | |||.| +-----| |||.|--------| |||.|------+ | +----------------------+ | | | | | Egress | | Unidirectional ROADM | | Ingress -----------------+ | | +-------------- <=====================| |===================< -----------------+ +----------------------+ +-------------- | | Port #1 | | Port #2 (West Line Side) | |(East Line Side) -----------------+ +----------------------+ +-------------- >=====================| |===================> -----------------+ | Unidirectional ROADM | +-------------- Ingress | | | | Egress | | _ | | | +----------------------+ | +-----| |||.|--------| |||.|------+ | |||.| | |||.| vvvvv ^^^^^ (Tributary) Ports #43-#82 Egress dropped from Ingress added to West Line ingress East Line egress Referring to the figure we see that the ingress direction of ports #3-#42 (add ports) can only connect to the egress on port #1. While the ingress side of port #2 (line side) can only connect to the egress on ports #3-#42 (drop) and to the egress on port #1 (pass through). Similarly, the ingress direction of ports #43-#82 can only connect to the egress on port #2 (line). While the ingress direction of port #1 can only connect to the egress on ports #43-#82 (drop) or port #2 (pass through). We can now represent this potential connectivity matrix as follows. This representation uses only 30 32- bit words. Bernstein and Lee Expires May 3, 2009 [Page 7] Internet-Draft Wavelength Switched Optical Networks November 2008 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Conn = 1 | Reserved |1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Note: adds to line +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=2 |0 1|0 0 0 0 0 0|Reserved(Note:inclusive range) |2 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #3 |3 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #42 |4 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |1 0|0 0 0 0 0 0|Reserved (Note:inclusive list) |5 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #1 |6 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Note: line to drops +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |0 1|0 0 0 0 0 0|Reserved (Note:inclusive list) |7 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #2 |8 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=2 |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|9 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #3 |10 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #42 |11 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Note: line to line +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |0 1|0 0 0 0 0 0|Reserved (Note:inclusive list) |12 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #2 |13 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|14 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #1 |15 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Note: adds to line +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=2 |0 1|0 0 0 0 0 0|Reserved(Note:inclusive range) |16 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #42 |17 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #82 |18 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Bernstein and Lee Expires May 3, 2009 [Page 8] Internet-Draft Wavelength Switched Optical Networks November 2008 | Action=0 |1 0|0 0 0 0 0 0|Reserved (Note:inclusive list) |19 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #2 |20 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Note: line to drops +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |0 1|0 0 0 0 0 0|Reserved (Note:inclusive list) |21 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #1 |22 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=2 |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|23 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #43 |24 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #82 |25 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Note: line to line +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |0 1|0 0 0 0 0 0|Reserved (Note:inclusive list) |26 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #1 |27 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action=0 |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|28 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link Local Identifier = #2 |30 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3.3. Wavelength Information Encoding This document makes frequent use of the lambda label format defined in [Otani] shown below strictly for reference purposes: 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 | C.S. |S| Reserved | n | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where Grid is used to indicate which ITU-T grid specification is being used. C.S. = Channel spacing used in a DWDM system, i.e., with a ITU-T G.694.1 grid. S = sign of the offset from the center frequency of 193.1THz for the ITU-T G.694.1 grid. Bernstein and Lee Expires May 3, 2009 [Page 9] Internet-Draft Wavelength Switched Optical Networks November 2008 n = Used to specify the frequency as 193.1THz +/- n*(channel spacing) where the + or - is chosen based on the sign (S) bit. 3.4. Wavelength Set Sub-TLV Wavelength sets come up frequently in WSONs to describe the range of a laser transmitter, the wavelength restrictions on ROADM ports, or the availability of wavelengths on a DWDM link. The general format for a wavelength set is given below. This format uses the Action concept from [RFC3471] with an additional Action to define a "bit map" type of label set. Note that the second 32 bit field is a lambda label in the previously defined format. This provides important information on the WDM grid type and channel spacing that will be used in the compact encodings listed. 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 | Num Wavelengths | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S. |S| Reserved | n for lowest frequency | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Additional fields as necessary per action | | Action: 0 - Inclusive List 1 - Exclusive List 2 - Inclusive Range 3 - Exclusive Range 4 - Bitmap Set 3.4.1. Inclusive/Exclusive Wavelength Lists In the case of the inclusive/exclusive lists the wavelength set format is given by: Bernstein and Lee Expires May 3, 2009 [Page 10] Internet-Draft Wavelength Switched Optical Networks November 2008 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 or 1 | Reserved | Num Wavelengths | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S. |S| Reserved | n for lowest frequency | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | n2 | n3 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | nm | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where Num Wavelengths tells us the number of wavelength in this inclusive or exclusive list this does not include the initial wavelength in the list hence if the number of wavelengths is odd then zero padding of the last half word is required. 3.4.2. Inclusive/Exclusive Wavelength Ranges In the case of inclusive/exclusive ranges the wavelength set format 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Action=2 or 3 | Reserved | Num Wavelengths | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S. |S| Reserved | n for lowest frequency | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ In this case Num Wavelengths specifies the number of wavelengths in the range starting at the given wavelength and incrementing the Num Wavelengths number of channel spacing up in frequency (regardless of the value of the sign bit). 3.4.3. Bitmap Wavelength Set In the case of Action = 4, the bitmap the wavelength set format is given by: Bernstein and Lee Expires May 3, 2009 [Page 11] Internet-Draft Wavelength Switched Optical Networks November 2008 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 = 4 | Reserved | Num Wavelengths | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S. |S| Reserved | n for lowest frequency | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Bit Map Word #1 (Lowest frequency channels) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Bit Map Word #N (Highest frequency channels) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Where Num Wavelengths in this case tells us the number of wavelengths represented by the bit map. Each bit in the bit map represents a particular frequency with a value of 1/0 indicating whether the frequency is in the set or not. Bit position zero represents the lowest frequency, while each succeeding bit position represents the next frequency a channel spacing (C.S.) above the previous. The size of the bit map is clearly Num Wavelengths bits, but the bit map is made up to a full multiple of 32 bits so that the TLV is a multiple of four bytes. Bits that do not represent wavelengths (i.e., those in positions (Num Wavelengths - 1) and beyond) SHOULD be set to zero and MUST be ignored. Example: A 40 channel C-Band DWDM system with 100GHz spacing with lowest frequency 192.0THz (1561.4nm) and highest frequency 195.9THz (1530.3nm). These frequencies correspond to n = -11, and n = 28 respectively. Now suppose the following channels are available: Frequency (THz) n Value bit map position -------------------------------------------------- 192.0 -11 0 192.5 -6 5 193.1 0 11 193.9 8 19 194.0 9 20 195.2 21 32 195.8 27 38 With the Grid value set to indicate an ITU-T G.694.1 DWDM grid, C.S. set to indicate 100GHz, and with S (sign) set to indicate negative this lambda bit map set would then be encoded as follows: Bernstein and Lee Expires May 3, 2009 [Page 12] Internet-Draft Wavelength Switched Optical Networks November 2008 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 = 4 | Reserved | Num Wavelengths = 40 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S. |S| Reserved | n for lowest frequency = -11 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1 0 0 0 0 0 1 0| Not used in 40 Channel system (all zeros) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3.5. Port Wavelength Restriction sub-TLV The port wavelength restriction of [WSON-Info] can be encoded as a sub-TLV 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |RestrictionKind|T| Reserved | MaxNumChannels | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ --Wavelength Set-- | Action | Reserved | Num Wavelengths | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S. |S| Reserved | n for lowest frequency | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Additional fields as necessary per action | | | RestrictionKind can take the following values and meanings: 0: Simple wavelength selective restriction. Max number of channels indicates the number of wavelengths permitted on the port and the accompanying wavelength set indicates the permitted values. 1: Waveband device with a tunable center frequency and passband. In this case the maximum number of channels indicates the maximum width of the waveband in terms of the channels spacing given in the wavelength set. The corresponding wavelength set is used to indicate the overall tuning range. Specific center frequency tuning information can be obtained from dynamic channel in use information. Bernstein and Lee Expires May 3, 2009 [Page 13] Internet-Draft Wavelength Switched Optical Networks November 2008 It is assumed that both center frequency and bandwidth (Q) tuning can be done without causing faults in existing signals. Values for T include: 0 == Use with a fixed connectivity matrix 1 == Use with a switched connectivity matrix TBD: Should we just have two flavors of sub-TLV then? 4. Composite TLVs The Four composite TLVs in the following sections are based on the four high level information bundles of [WSON-Info]. 4.1. WSON Node TLV The WSON Node TLV consists of the following ordered list of sub-TLVs: ::= [] [], [] [] o Node ID (This will be derived from standard IETF node identifiers) o Switch Connectivity Matrix - (optional) This is a connectivity matrix sub-TLV with the connectivity type set to "switched" (conn = 1) o Fixed Connectivity Matrix - (optional) This is a connectivity matrix sub-TLV with the connectivity type set to "fixed" (conn = 0). o Shared Risk Node Group - (optional) Format TBD. o Wavelength Converter Pool - (optional) Format TBD. 4.2. WSON Link TLV Note that a number of sub-TLVs for links have already been defined and it is for further study if we can or should reuse any of those sub-TLVs in our encoding. Note that for a system already employing GMPLS based routing the existing encodings and transport mechanisms should be used and the information does not need to appear twice. Bernstein and Lee Expires May 3, 2009 [Page 14] Internet-Draft Wavelength Switched Optical Networks November 2008 ::= [] [] [] []... [] [] <[SwitchedPortWavelengthRestriction>] [] o Link Identifier - Need to double check on this with RFC4203 (required). o Administrative Group - (optional) Standard sub-TLV type 9, RFC3630. o Interface Switching Capability Descriptor - Standard sub-TLV type 15, RFC4203. o Protection - (optional) Standard sub-TLV type 15, RFC4203. o Shared Risk Link Group - (optional) Standard sub-TLV 16, RFC4203. o Traffic Engineering Metric - (optional) Standard sub-TLV type 5, RFC3630. o Maximum Bandwidth per Channel - TBD. o Switched Port Wavelength Restriction - (optional) The port wavelength restriction sub-TLV with T = 1. o Fixed Port Wavelength Restriction - (optional) The port wavelength restriction sub-TLV with T = 0. 4.3. WSON Dynamic Link TLV ::= [] Where ::= o Available Wavelengths - A wavelength set sub-TLV used to indicate which wavelengths are available on this link. o Shared Backup Wavelengths - (optional) A wavelength set sub-TLV used to indicate which wavelengths on this link are currently used for shared backup protection (and hence can possibly be reused). Bernstein and Lee Expires May 3, 2009 [Page 15] Internet-Draft Wavelength Switched Optical Networks November 2008 4.4. WSON Dynamic Node TLV ::= [] o Node ID - Format TBD. o Wavelength Converter Pool Status - (optional) Format TBD. Note that currently the only dynamic information modeled with a node is associated with the status of the wavelength converter pool. 5. 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. 6. IANA Considerations TBD. Once our approach is finalized we may need identifiers for the various TLVs and sub-TLVs. 7. Acknowledgments This document was prepared using 2-Word-v2.0.template.dot. Bernstein and Lee Expires May 3, 2009 [Page 16] Internet-Draft Wavelength Switched Optical Networks November 2008 8. References 8.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB", RFC 2863, June 2000. [RFC3471] Berger, L., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3471, January 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. [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-02.txt, July 2008. 8.2. 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. [RFC5307] Kompella, K., Ed., and Y. Rekhter, Ed., "IS-IS Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)", RFC 5307, October 2008. Bernstein and Lee Expires May 3, 2009 [Page 17] Internet-Draft Wavelength Switched Optical Networks November 2008 [Switch] G. Bernstein, Y. Lee, A. Gavler, J. Martensson, " Modeling WDM Wavelength Switching Systems for use in Automated Path Computation", http://www.grotto- networking.com/wson/ModelingWSONswitchesV2a.pdf , June, 2008 [WSON-Frame] G. Bernstein, Y. Lee, W. Imajuku, "Framework for GMPLS and PCE Control of Wavelength Switched Optical Networks", work in progress: draft-ietf-ccamp-wavelength-switched- framework-01.txt, July 2008. [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-01.txt, October 2008. [PCEP] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation Element (PCE) communication Protocol (PCEP) - Version 1", draft-ietf-pce-pcep, work in progress. Bernstein and Lee Expires May 3, 2009 [Page 18] Internet-Draft Wavelength Switched Optical Networks November 2008 9. 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 Authors' Addresses Greg M. Bernstein (ed.) Grotto Networking Fremont California, USA Phone: (510) 573-2237 Email: gregb@grotto-networking.com Bernstein and Lee Expires May 3, 2009 [Page 19] Internet-Draft Wavelength Switched Optical Networks November 2008 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 Intellectual Property Statement The IETF 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 this 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. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. Bernstein and Lee Expires May 3, 2009 [Page 20] Internet-Draft Wavelength Switched Optical Networks November 2008 The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Disclaimer of Validity This document and the information contained herein 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 HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Copyright Statement Copyright (C) The IETF Trust (2008). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Bernstein and Lee Expires May 3, 2009 [Page 21]