--- 1/draft-ietf-ccamp-rwa-wson-encode-00.txt 2009-03-03 20:12:22.000000000 +0100 +++ 2/draft-ietf-ccamp-rwa-wson-encode-01.txt 2009-03-03 20:12:22.000000000 +0100 @@ -1,24 +1,24 @@ Network Working Group G. Bernstein Internet Draft Grotto Networking Intended status: Standards Track Y. Lee -Expires: June 2009 D. Li +Expires: September 2009 D. Li Huawei W. Imajuku NTT - December 18, 2008 + March 3, 2009 Routing and Wavelength Assignment Information Encoding for Wavelength Switched Optical Networks - draft-ietf-ccamp-rwa-wson-encode-00.txt + draft-ietf-ccamp-rwa-wson-encode-01.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. @@ -27,87 +27,93 @@ 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 18, 2007. + This Internet-Draft will expire on September 3, 2009. Copyright Notice - Copyright (c) 2008 IETF Trust and the persons identified as the + Copyright (c) 2009 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. 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, + GMPLS 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 + 1.1. Revision History..........................................4 + 1.1.1. Changes from 00 draft................................4 + 2. Terminology....................................................4 + 3. Encoding of WSON Information: Sub-TLVs.........................5 + 3.1. Link Set Sub-TLV..........................................5 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 - 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 + 3.3. Wavelength Information Encoding..........................10 + 3.4. Wavelength Set Sub-TLV...................................11 + 3.4.1. Inclusive/Exclusive Wavelength Lists................11 + 3.4.2. Inclusive/Exclusive Wavelength Ranges...............12 + 3.4.3. Bitmap Wavelength Set...............................12 + 3.5. Port Wavelength Restriction sub-TLV......................14 + 3.6. Wavelength Converter Set Sub-TLV.........................15 + 3.7. Wavelength Converter Accessibility Sub-TLV...............16 + 3.8. Wavelength Conversion Range Sub-TLV......................19 + 3.9. WC Usage State Sub-TLV...................................21 + 4. Composite TLVs................................................22 + 4.1. WSON Node TLV............................................22 + 4.2. WSON Link TLV............................................23 + 4.3. WSON Dynamic Link TLV....................................24 + 4.4. WSON Dynamic Node TLV....................................24 + 5. Security Considerations.......................................24 + 6. IANA Considerations...........................................24 + 7. Acknowledgments...............................................25 + 8. References....................................................26 + 8.1. Normative References.....................................26 + 8.2. Informative References...................................26 + 9. Contributors..................................................28 + Authors' Addresses...............................................28 + Intellectual Property Statement..................................29 + Disclaimer of Validity...........................................30 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 @@ -118,20 +124,37 @@ 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. +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. + 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 @@ -260,21 +284,22 @@ : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 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? + TBD: Should we just have two sub-TLVs one for fixed one for switched, + or should we number matrices for a more general solution. 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. (Tributary) Ports #3-#42 @@ -391,54 +416,52 @@ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 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 | + |Grid | C.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. - n = Used to specify the frequency as 193.1THz +/- n*(channel spacing) - where the + or - is chosen based on the sign (S) bit. + and n is an integer to take either a negative, zero or a positive + value. 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 | + |Grid | C.S. | Reserved | n for lowest frequency | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Additional fields as necessary per action | | Action: 0 - Inclusive List 1 - Exclusive List @@ -451,21 +474,21 @@ 3.4.1. Inclusive/Exclusive Wavelength Lists In the case of the inclusive/exclusive lists 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=0 or 1 | Reserved | Num Wavelengths | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - |Grid | C.S. |S| Reserved | n for lowest frequency | + |Grid | C.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 @@ -474,39 +497,38 @@ 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 | + |Grid | C.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). + Wavelengths number of channel spacing up in frequency. 3.4.3. Bitmap Wavelength Set In the case of Action = 4, the bitmap 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 = 4 | Reserved | Num Wavelengths | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - |Grid | C.S. |S| Reserved | n for lowest frequency | + |Grid | C.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 @@ -532,49 +554,49 @@ -------------------------------------------------- 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: + set to indicate 100GHz this lambda bit map set would then be encoded + 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Action = 4 | Reserved | Num Wavelengths = 40 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - |Grid | C.S. |S| Reserved | n for lowest frequency = -11 | + |Grid | C.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 | + |Grid | C.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. @@ -577,31 +599,309 @@ 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. - 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? + TBD: Should we just have two flavors of sub-TLV, or if we add + numbering to identify matrices we could add a number field here + (using currently reserved bits) to associate the constraints with the + right matrix. + +3.6. Wavelength Converter Set Sub-TLV + + A WSON node may include a set of wavelength converters (WC). We need + to describe the WC list which a node supports. This can be done via a + WC Set concept similar to the label set concept of [RFC3471]. + + The information carried in a WC 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 | Reserved | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC Identifier 1 | WC Identifier 2 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : : : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC Identifier n-1 | WC Identifier n | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Action: 8 bits + + 0 - Inclusive List + + Indicates that the TLV contains one or more WC elements that are + included in the list. + + 2 - Inclusive Range + + Indicates that the TLV contains a range of WCs. 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. + + Reserved: 24 bits + + This field is reserved. It MUST be set to zero on transmission and + MUST be ignored on receipt. + + WC Identifier: + + The WC identifier represents the ID of the wavelength convertor which + is a 16 bit integer. + +3.7. Wavelength Converter Accessibility Sub-TLV + + A WSON node may include wavelength converters. As described in [WSON- + Info], we should give the accessibility of a wavelength converter to + convert from a given ingress wavelength on a particular ingress + port to a desired egress wavelength on a particular egress port. + Before this, we need to describe the accessibility of a wavelength + converter to convert form a given ingress port to a desired egress + port. This information can be determined by the PoolIngressMatrix and + PoolEgressMatrix of [WSON-Info]. We can use a set of links (Link set) + followed by a set of WCs (WC set) to represent that this link set can + access this WC set. We use a set of WC (WC set) followed by a set of + links (Link set) to represent that this WC set can access this link + set. + + The wavelength converter accessibility TLV 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Num In Pairs | Reserved | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Ingress Link Set A #1 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC Set A #1 | + : : : + : : : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Additional Link set and WC set pairs as needed to | + : specify PoolIngressMatrix : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC Set B #1 (for egress connectivity) | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Egress link Set B #1 | + : : : + : : : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Additional WC set and egress link set pairs | + : as needed to specify PoolEgressMatrix : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Where Num_In_Pairs tells us the number of ingress link and WC set + pairs. TBD: if link sets are identified in their own sub-TLVs and + similarly for WC sets then we may not need this field. + + 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 | E1 + I1 /D+--->| |--------------------->| m | + + e+--->| | | b |========> + ========>| M| | Optical | +-----------+ | i | Port #3 + Port #1 + u+--->| Switch | | WC Pool | | n | + \x+--->| | | +-----+ | | e | + \| | +----+->|WC #1|--+---->| r | + | | | +-----+ | +------+ + | | | | +------+ + /| | | | +-----+ | | | + I2 /D+--->| +----+->|WC #2|--+---->| C | E2 + + e+--->| | | +-----+ | | o | + ========>| M| | | +-----------+ | m |========> + Port #2 + u+--->| | | b | Port #4 + \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: + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Num In Pairs=1| Reserved | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + Note: I1,I2 can connect to either WC1 or WC2 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Action=0 |0 1|0 0 0 0 0 0|Reserved(Note: inclusive list) | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Link Local Identifier = #1 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Link Local Identifier = #2 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Action=0 | Reserved(Note: inclusive WC list) | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC ID = #1 | WC ID = #2 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + Note: WC1 can only connect to E1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Action=0 | Reserved(Note: inclusive list) | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC ID = #1 | zero padding | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Action=0 |1 0|0 0 0 0 0 0|Reserved(Note: inclusive list) | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Link Local Identifier = #3 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + Note: WC2 can only connect to E2 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Action=0 | Reserved(Note: inclusive WC list) | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC ID = #2 | zero padding | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Action=0 |1 0|0 0 0 0 0 0|Reserved(Note: inclusive list) | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Link Local Identifier = #4 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + +3.8. Wavelength Conversion Range Sub-TLV + + Since not all wavelengths can necessarily reach all the converters or + the converters may have limited input wavelength range we can have a + set of ingress wavelength constraints for each wavelength converter. + In addition, we also can have output wavelength constraints. + + The information carried in a wavelength conversion range Sub-TLV 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Reserved | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC Set #1 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Input Wavelength Set #1 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Output Wavelength Set #1 | + : : : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Additional WC Wavelength constraint set pairs as needed | + : : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + WC Set: + + Indicates the WCs which have the same conversion range. We group the + WCs which have the same conversion range to WC Set followed by the + input and output wavelength range for reducing the data size. + + The format of WC Set is consistent with the encoding of "WC Set Sub- + TLV". + + Input Wavelength Set: + + Indicates the wavelength input range of WC(s). + + The format of Input Wavelength Set is consistent with the encoding of + "Wavelength Set Sub-TLV". + + Output Wavelength Set: + + Indicates the wavelength output range of WC(s). + + The format of Output Wavelength Set is consistent with the encoding + of "Wavelength Set Sub-TLV". + + Example: + + We give an example based on figure 1 about how to represent the + wavelength conversion range of wavelength converters. Suppose the + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Reserved | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + Note: WC Set + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Action=0 |0 1| Reserved(Note: inclusive list) | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC ID = #1 | WC ID = #2 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + Note: wavelength input range + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Action = 2 | Reserved | Num Wavelengths = 4 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |Grid | C.S. | Reserved | n for lowest frequency = 1 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + Note: wavelength output range + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Action = 2 | Reserved | Num Wavelengths = 4 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |Grid | C.S. | Reserved | n for lowest frequency = 1 | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + +3.9. WC Usage State Sub-TLV + + WC Usage state dependents upon whether the wavelength converter in + the pool is in use. This is the only state kept in the converter pool + model. + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC Set sub-TLV | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | WC Usage state | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | ...... | Padded bits | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + WC Usage state can be encoded by bit map. The bits indicate the usage + state of the wavelength convertors which is being described in the WC + Set sub-TLV. + + WC Usage state: : Variable Length. + + Each bit indicates the usage status of one WC. The sequence of the + bit map is consistent with the WC list in this TLV. + + Padded bit: Variable Length + + It is used to pad the bit to make the whole number of bits in bitmap + be the time of 32. Padded bit MUST be set to 0. 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: @@ -611,23 +911,27 @@ 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 Shared Risk Node Group - (optional) Format TBD (note that current + GMPLS SRLG encoding is general enough to include SRNG + information). - o Wavelength Converter Pool - (optional) Format TBD. + o Wavelength Converter Pool TLVs- (optional) Wavelength Converter + Set Sub-TLV, Wavelength Converter Accessibility Sub-TLV, and + Wavelength Conversion Range Sub-TLV. 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. ::= [] [] @@ -675,21 +979,22 @@ 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). 4.4. WSON Dynamic Node TLV ::= [] o Node ID - Format TBD. - o Wavelength Converter Pool Status - (optional) Format TBD. + o Wavelength Converter Pool Status - (optional) This is the WC Usage + state sub-TLV. 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 @@ -729,40 +1034,40 @@ 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. + lambda-labels-03.txt. 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. [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 + [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-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 @@ -828,20 +1133,29 @@ 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 + 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.