Network Working Group Zhihong.Kang Zhenyu.Wang Feng.Gao Internet Draft ZTE Intended status: September 9, 2008 Expires: Jan 2009 Link Connectivity and Common Constraint Information Extension to GMPLS for WDM Switched Optical Networks draft-kang-ccamp-wdm-switch-info-00.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 March 9, 2007. Copyright Notice Copyright (C) The IETF Trust (2008). Abstract This document provides the mechanism of link connectivity verification and the constraint information extension to GMPLS IGP or Zhihong Expires March 9, 2009 [Page 1] Internet-Draft WDM Switched Optical Network Sep 2008 Conveyed to a path computation element (PCE) for static light path computation and selection in WDM network. Table of Contents 1. Introduction..................................................2 2. Terminology...................................................3 3. Link Verification.............................................4 4. Constraint Information........................................4 4.1. WDM Link Bandwidth.......................................5 4.2. WDM Link Layer Constraint................................5 4.3. WDM Optical Channel Constraint...........................5 4.4. WDM Optical Tributary Constraint.........................6 4.5. Optical-Electronic Conversion Port Switch Capability.....6 4.6. Tunable Laser............................................6 5. Information Model.............................................7 5.1. Link Information.........................................7 5.2. Lambda Group ID..........................................8 5.3. O-E-O Switch ID..........................................9 5.4. Wavelength Label........................................10 6. Application to OSPF GMPLS extensions.........................10 6.1. Link Sub-TLVs...........................................10 6.1.1. Maximum of optical channels sub-TLV................11 6.1.2. Link Constraint sub-TLV............................11 6.1.3. Wavelength Availability, Switch Capability Sub-TLV.17 6.1.4. Reachable Add or Drop Port Sub-TLV.................18 7. Security Considerations......................................19 8. IANA Considerations..........................................19 9. Acknowledgments..............................................20 10. References..................................................20 10.1. Normative References...................................20 10.2. Informative References.................................20 Author's Addresses..............................................21 Intellectual Property Statement.................................21 Disclaimer of Validity..........................................22 1. Introduction This document provides foundational information model Appling GMPLS to WDM network, we called the series of function aggregation for GMPLS applied to WDM network "WSON" (Wavelength Switch Optical Network). This likewise includes automatic discovery, route, and signaling. But the current standard RFC cannot completely support WSON implementation. It is well-known that RWA is the key problem in WSON. There are certain constraints in the light path computation and selection process, this is the root of RWA problem. This document provides the constraint information model used for optical light path Kang Expires March, 2009 [Page 2] Internet-Draft WDM Switched Optical Network Sep 2008 computation and selection. Actually the information model needs to solve two problems: one is the inner optical light path routing representation information and the corresponding available resources (Wavelengths) description. The other is the switch capability information based on the optical wavelength channel layer or Optical- Electronic switch port, this is also used for multi-layer path computation and implementation. In WDM network, there are certain specific constraints which are different from other circuit switched network such as Time Division Multiplexing (TDM). The constraints mainly include: a) WDM link layer constraint, if the traffic need to pass through from linear ingress port to linear egress port, there must be having the inner connectivity from linear ingress port to linear egress port. b) WDM optical channel layer constraint, the traffic carried in the wavelength need to keep consistent along the light path without O-E-O (Optical-Electrical-Optical), it is known that this is "wavelength continuity" constraint. Even though there are certain wavelength switch capabilities by O-E-O way, but which cannot support full switch because of the electronic matrix switch capability limitation. c) WDM optical tributary constraint, not every linear Ingress port could have the inner light path connectivity and available wavelengths along the inner light path to tributary drop ports. And not every tributary add port could have the inner light path connectivity and available wavelengths along the inner light path to linear egress ports. In addition optical impairments (such as signal power, OSNR) are not to be considered. This document prefer to the combined RWA way to describe information model and efficient encodings extension to GMPLS IGP application. In addition these useful information and encodings could be conveyed to a path computation element (PCE). 2. Terminology WDM: Wavelength Division Multiplexing WSON: WDM Switch Optical Network RWA: Route and Wavelength Assignment Kang Expires March, 2009 [Page 3] Internet-Draft WDM Switched Optical Network Sep 2008 DCC: Data Communication Channel OSC: Optical Supervisory Channel ROADM: Reconfigurable Optical Add/Drop Multiplexer O-E-O: Optical-Electronic-Optical SDH: Synchronous digital hierarchy SONET: Synchronous Optical Network 3. Link Verification Link verification is used to verify the physical connectivity of the data links and to exchange the Interface Ids of the data links. The data links between adjacent nodes in WDM network also need the transport medium to verify the connectivity and exchange the interface Ids of data plane. Then synchronize the data links to form TE link used for path computation and signaling. RFC4207 have significantly defined the mechanisms of link connectivity applicable to SDH/SONET. But for WDM system, there is no significant definition for the link connectivity verification mechanism. OSC channel is the natural and specific transport channel embedded in the WDM link. So this document defines the new link verification mechanism used for WDM link. The following is the two mechanism definition. One is that Test message is sent over OSC channel and TestStatus messages sent back over the control channel. The Test Message is defined in [RFC4204]. The other is that the OSC channel is used to send and receive Trace Message. The Test Message is not transmitted over OSC channel (i.e., over the data link), but is sent over the control channel and correlated for consistency to the received Trace Message from OSC channel. The content of Trace Message is unique in the network. It could be the combination of local interface Id and Node Id. The process of link connectivity verification between adjacent WDM nodes is consistent with SDH/SONET, this can be referred to [RFC4204] and [RFC4207]. 4. Constraint Information WDM Link Bandwidth Kang Expires March, 2009 [Page 4] Internet-Draft WDM Switched Optical Network Sep 2008 Link Constraint Character Wavelength Continuity Constraint O-E-O Wavelength Switch Capability Optical-Electronic Conversion Port Switch Capability Tunable Transmitter Laser 4.1. WDM Link Bandwidth The bandwidth of WDM link should be regarded as the number of wavelengths, which could not be counted as signal rates because the wavelength cannot be restricted to carry certain rates of signal, or certain frame type of signal. Consider to interlayer, Wavelength channel layer is used to be server layer path to carry client traffic, such as SDH/SONET, ODUk. 4.2. WDM Link Layer Constraint Inner link connectivity of one link with other links in one node identifies the link constraint information. The link constraint information indicates out the possibility of conveying traffic in the link layer. 4.3. WDM Optical Channel Constraint It is known that the wavelength basically need to keep consistent along the light path, this is called Wavelength continuity constraint. Even though O-E-O conversion can add certain wavelength switch capability to the system, but the electronic matrix in the WDM equipment do not completely have the full switch capability. In addition wavelength switch capability information only can be applied to the condition that is the specific wavelength must have the single correlation with one fixed Optical-Electronic switch port whose transmitter laser is not tunable. Under this condition, wavelength switch capability can be characterized by an input wavelength set and an output wavelength set. The signals carried in an input wavelength set flow in the same electronic matrix unit, do switch, and then flow out with equivalent contents bearing the output wavelength set. We named "Lambda Group Id" to represent the identification of aggregation of an input wavelength set and an output wavelength set which could be mutually switched, Lambda Group Id could be the Kang Expires March, 2009 [Page 5] Internet-Draft WDM Switched Optical Network Sep 2008 identification of electronic matrix unit in the system. The "Lambda Group Id" is carried with wavelength status to represent the wavelength constraint information. So wavelength availability and switch capability information are important to analyze the availability of resources along the light path. 4.4. WDM Optical Tributary Constraint Not every linear Ingress port could have the inner light path connectivity and available wavelengths along the inner light path to tributary drop ports. It is also that not every tributary add port could have the inner light path connectivity and available wavelengths along the inner light path to linear egress ports. The link information should indicate out the reachable tributary ports and corresponding available wavelengths for the reachable tributary ports. 4.5. Optical-Electronic Conversion Port Switch Capability Port switch capability indicate out the traffic with one specific wavelength (which is in the tunable extent) flow in Optical- Electronic Conversion ingress port, do optical-electronic conversion, do electronic matrix switch, then do electronic-optical conversion, flow out from Optical-Electronic Conversion egress port with one specific wavelength (which is in the tunable extent). The port switch capability could be characterized by one unique ID in one node which represents the aggregation of ingress ports and egress ports. The unique ID is named O-E-O switch ID. The link information also needs to indicate out the reachable Optical-Electronic Conversion Ports and the corresponding available wavelengths. The port switch capability is accompanied with t his information. This is the base model to implement wavelength switch by O-E-O way. 4.6. Tunable Laser The transmitter laser is tunable, this add certain flexibility for the inner path computation and selection process. Kang Expires March, 2009 [Page 6] Internet-Draft WDM Switched Optical Network Sep 2008 5. Information Model 5.1. Link Information WDM link information derives from RFC3630 and RFC4203, and adds new sub-element constraints to link information model: (a) Maximum of optical channels (wavelength), which is the bandwidth of WDM link. (b) Link index, this is used to account for the bit map position in the link constraint information, this is one global unique Id start from 1 and assigned in the node. (c) Link constraint information, which represents the connectivity with other links, and was indicated by the bit map, the bit position represents the connectivity with one link, or indicated by the link set. (d) Wavelength availability, which represent the state of the corresponding optical wavelength channel. (e) Wavelength switch capability, one set of wavelength aggregation could be switched via electronic matrix. The optical signals carried in the wavelength can flow to or flow out from the same electronic matrix unit after optical-electronic-optical change, all of these wavelengths could switch. One global unique ID named "Lambda Group Id" represents one electronic matrix unit. The Lambda Group Id is the identification of the aggregation of wavelengths in which the optical signals flow to or flow out from the same matrix unit. Lambda Group Id represent the aggregation of wavelength set, the wavelengths with same Lambda Group Id can be mutually switched via O- E-O. The special value 0 represent the optical signal carried in the wavelength only can pass via the same wavelength, and do not have the wavelength switch capability. Wavelength switch capability can be identified by Lambda Group Id, which was carried with Wavelength availability information. (f) Reachable tributary add or drop ports, link information should indicate out the Reachable tributary add or drop ports. For each reachable port, it also needs to indicate out the available wavelengths. For Optical-Electronic conversion port, it also needs to indicate out the switch capability. Kang Expires March, 2009 [Page 7] Internet-Draft WDM Switched Optical Network Sep 2008 Note: only (a) are necessary for WDM link, others are used for combined RWA. 5.2. Lambda Group ID +------+ +------+ | | =+=+=+=+=+Lambda 1 Lambda 5 +=+=+=+=+= | | + DWDM + =+=+=+Lambda 2 | +------+ |Lambda 6 +=+=+= + DWDM + | 1 | =+Lambda 3 | +=+= | | =+=+ |Lambda 7 += | 2 | +------+ | +=+=+=+= +MATRIX| =+=+=+=+ | +------+ +=+=+=+=+=+= | 1 | =+=+=+=+=+=+ +------+ +------+ +------+ | | =+=+=+=+=+Lambda 1 Lambda 3 +=+=+=+=+= | | + DWDM + =+=+=+Lambda 3 | +------+ |Lambda 5 +=+=+= + DWDM + | 3 | =+Lambda 4 | +=+= | | =+=+ |Lambda 7 += | 4 | +------+ | +=+=+=+= +MATRIX| =+=+=+=+ | +------+ +=+=+=+=+=+= | 2 | =+=+=+=+=+=+ +------+ Figure 1 O-E-O Wavelength Switch Model The Lambda Group ID is identification of the aggregation of Wavelength set in which the wavelengths could be mutually switched, and is also the identification of O-E-O switch capability. Here don't consider the asymmetric switch matrix. The figure showed above, the link from DWDM1 have three lambdas (Lambda 1, Lambda 2, Lambda 3) flow to the matrix unit1, the link from DWDM2 have three lambdas (Lambda 5, Lambda 6, Lambda 7) flow to the matrix unit1, they could be switched. Likewise the link from DWDM3 have three lambdas (Lambda 1, Lambda 3, Lambda 4) flow to the Kang Expires March, 2009 [Page 8] Internet-Draft WDM Switched Optical Network Sep 2008 matrix unit2, the link from DWDM4 have three lambdas (Lambda 3, Lambda 5, Lambda 7) flow to the matrix unit2, they could be switched. For the lambdas (Lambda 1, Lambda 2, Lambda 3) of the link of DWDM1 and the lambdas (Lambda 5, Lambda 6, Lambda 7) of the link of DWDM2, the Lambda Group ID could assign to be 1; For the lambdas (Lambda 1, Lambda 3, Lambda 4) of the link of DWDM3 and the lambdas (Lambda 3, Lambda 5, Lambda 7) of the link of DWDM4, the Lambda Group ID could assign to be 2; So the lambda group id is the identification of wavelength switch capability, and also is the identification of the aggregation of Wavelength set in which the wavelengths could be mutually switched, and their lambda group ids are same. The special value 0 lambda group id represent the optical signal carried in the wavelength only can pass via the same wavelength. Do not have the capability of O-E-O. 5.3. O-E-O Switch ID +--------+ +--------+ | WDM | Port_1+------+ +------+ Port_2 | WDM | | Link 1 +========+ O/E +===|| ||===+ E/O +=========+ Link 2 | | | | Unit | || || | Unit | | | +--------+ +------+ || || +------+ +--------+ || || +--++---++--+ | Electronic| | Matrix | | Unit | +--++---++--+ || || +--------+ +------+ || || +------+ +--------+ | WDM | Port_3| O/E | || || | E/O | Port_4 | WDM | | Link 3 +========+ Unit +===|| ||===+ Unit +======== + Link 4 | | | +------+ +------+ | | +--------+ +--------+ Figure 2 O-E-O Port Switch Model Kang Expires March, 2009 [Page 9] Internet-Draft WDM Switched Optical Network Sep 2008 The figure showed above, there are four optical-electronic conversion units. These four optical-electronic conversion units could be mutually switched via one electronic switch unit. The port switch capability can be characterized by one unique ID named O-E-O Switch ID which is related to the electronic switch unit identification. The link information indicates out the reachable optical-electronic conversion ports and the available resources. In addition, for each reachable port, it also indicates out the port switch capability. 5.4. Wavelength Label This document makes frequent use of the lambda label format defined in [Otani] 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S |S| Reserved | n | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 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 an ITU-T G.694.1 grid. S = Sign for the value of n, set to 1 for (-) and 0 for (+). n = Used to specify the frequency as 193.1THz +/- n*(channel spacing) where the + or - is chosen based on the sign (S) bit. 6. Application to OSPF GMPLS extensions 6.1. Link Sub-TLVs As discussed in section 5.1, some sub-TLVs need to characterize for WDM links. Kang Expires March, 2009 [Page 10] Internet-Draft WDM Switched Optical Network Sep 2008 6.1.1. Maximum of optical channels sub-TLV Maximum of optical channels sub-TLV specifies the maximum optical wavelength channels that can be used on this WDM link. The value can be 40, 80, 160, 192 etc. 6.1.2. Link Constraint sub-TLV There are two ways to show the link connectivity constraint with other links. One is the links including list, the second is the bit map to indicate the connectivity with other links. The second need to assign the unique index for each link. The information carried in the link constraint 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Dir| Method | Index | Num Links | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Bit Map Word #1 Or Link Identifier 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : : : : : : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Bit Map Word #N Or Link Identifier N | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Dir: 2 bits 0 - bidirectional, Indicate the connectivity from the link to other links bidirectional. 1 - Ingress, Indicate the connectivity to other links from the ingress port of the link to the egress ports of other links. Kang Expires March, 2009 [Page 11] Internet-Draft WDM Switched Optical Network Sep 2008 2 - Egress, Indicate the connectivity from the ingress ports of other links to the egress port of the link. Method: 6 bits 0 - Bit Map 1 - Link Set Others - Reserved to be used later. Index: 8 bits Index is one unique Id assigned in the node, start from 1. This is used to account for bit position in the bit map carried in other links constraint sub-TLV. Num Links: 8 bits Num links tell us the number of link identifiers followed or the number bits of link connectivity represented by the bit map. Bit map have the same rule in the link constraint information in order that RWA algorithm can analyze the connectivity of links. Each bit in the bit map represents one specific link with value 1/0 indicating the constraint connectivity with the link. The bit position represent the specific link which is its own, the value on this bit is 1. A B C D E F G H I K J L M N O P Q R S +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | | | | | | | | | | | | | | | | | | ::: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ The rule for bit map showed below, the link index is used here to indicate the bit position. Position Link Index Meaning Kang Expires March, 2009 [Page 12] Internet-Draft WDM Switched Optical Network Sep 2008 --------------------------------------------------------------------- A 1 indicate connectivity between the link and link of index 1 B 2 indicate connectivity between the link and link of index 2 C 3 indicate connectivity between the link and link of index 3 D 4 indicate connectivity between the link and link of index 4 E 5 indicate connectivity between the link and link of index 5 F 6 indicate connectivity between the link and link of index 6 G 7 indicate connectivity between the link and link of index 7 H 8 indicate connectivity between the link and link of index 8 I 9 indicate connectivity between the link and link of index 9 : : : : : : : : : : : : --------------------------------------------------------------------- For example: V^ 2 || || || || 1 +-+-+-+-+-+-+-+ 3 <---------------| | ----------------< >---------------+ ROADM + ----------------> Kang Expires March, 2009 [Page 13] Internet-Draft WDM Switched Optical Network Sep 2008 | | +-+-+-+-+-+-+-+ || || || || ^V 4 Figure 2 Example For WDM Links There are four WDM links in the ROADM node, and the link index are respectively 1, 2, 3, 4. Here ignore the detail of connectivity between the links. Assume that Link 1 bidirectional connect to Link 2, and Link 3 bidirectional connect to Link 4. The constraint information in each link represent as follows: Link of Index 1: 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 | 1 | 1 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link identifier of Index 2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Or: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Kang Expires March, 2009 [Page 14] Internet-Draft WDM Switched Optical Network Sep 2008 | 0 | 0 | 1 | 4 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|0|0| | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Link of Index 2: 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 | 2 | 1 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link identifier of Index 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Or: 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 | 0 | 2 | 4 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|0|0| | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Link of Index 3: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Kang Expires March, 2009 [Page 15] Internet-Draft WDM Switched Optical Network Sep 2008 | 0 | 1 | 3 | 1 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link identifier of Index 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Or: 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 | 0 | 3 | 4 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|0|1|1| | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Link of Index 4: 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 | 4 | 1 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Link identifier of Index 3 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Or: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Kang Expires March, 2009 [Page 16] Internet-Draft WDM Switched Optical Network Sep 2008 | 0 | 0 | 4 | 4 | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|0|1|1| | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6.1.3. Wavelength Availability, Switch Capability Sub-TLV The information of optical wavelength channel includes the resource state, and description of switch capability via O-E-O. Wavelength Availability, Switch Capability Sub-TLV 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Grid | C.S |S| Reserved | Num Wavelengths | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | N1 For Start Center Frequency |Lambda Group Id| State | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | N2 |Lambda Group Id| State | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Nn (Highest frequency channels)|Lambda Group Id| State | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Num Wavelengths specifies the number of wavelengths followed in the sub-TLV. This is generally equal to Maximum of optical channels. Kang Expires March, 2009 [Page 17] Internet-Draft WDM Switched Optical Network Sep 2008 Lambda group Id indicates the wavelength switch capability. The special value 0 represents no optical-electronic conversion capability. State indicates the resource state of wavelength channel. 0 is free, 1 is occupied. 6.1.4. Reachable Add or Drop Port Sub-TLV The reachable Add or Drop Port 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Dir | Reserved | Num of Reachable Ports | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Port Identifier1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Port1 Switch Capability |Num Suggested Available Lambdas| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Suggested Lambda #1 | Suggested Lambda #2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ... | Suggested Lambda #N | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Port IdentifierN | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | PortN Switch Capability |Num Suggested Available Lambdas| Kang Expires March, 2009 [Page 18] Internet-Draft WDM Switched Optical Network Sep 2008 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Suggested Lambda #1 | Suggested Lambda #2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ... | Suggested Lambda #N | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Dir: 8 bits 0 - bidirectional, Indicate the connectivity from the link to Tributary add and drop ports, or optical-electronic conversion add and drop ports. 1 - Ingress, Indicate the connectivity from the ingress port of the link to the Tributary drop ports or optical-electronic conversion drop ports. 2 - Egress, Indicate the connectivity from the Tributary add ports or optical-electronic conversion add ports to the egress port of the link. Num of Reachable Ports: 16 bits Num of Reachable Ports indicates out the number of reachable Ports information followed, including the available wavelengths and port switch capability information. This sub-TLV gives out the Edge Link information and the suggested available lambdas could be dropped traffic signal from the link to edge link, and can add client traffic signal from edge link to the link. 7. Security Considerations This document has no requirement for a change to the security models within GMPLS and associated protocols. 8. IANA Considerations No new values are specified in this document. Kang Expires March, 2009 [Page 19] Internet-Draft WDM Switched Optical Network Sep 2008 9. Acknowledgments This document was prepared using 2-Word-v2.0.template.dot. 10. References 10.1. Normative References [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. [RFC3630] Katz, D., Kompella, K., and D. Yeung, "Traffic Engineering (TE) Extensions to OSPF Version 2", RFC 3630, September 2003. [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. 10.2. Informative References [Otani] T. Otani, H. Guo, K. Miyazaki, D. Caviglia, "Generalized Labels of Lambda-Switching Capable Label Switching Routers (LSR)", work in progress: draft-otani-ccamp-gmpls-lambda- labels-01.txt, November 2007. Kang Expires March, 2009 [Page 20] Internet-Draft WDM Switched Optical Network Sep 2008 Author's Addresses Zhihong Kang ZTE Technologies Co., Ltd. 12F, ZTE Plaza, No.19 East HuaYuan Road, HaiDian District Phone: +86-10-82963984 Email: kang.zhihong@zte.com.cn Zhenyu Wang ZTE Technologies Co., Ltd. 12F, ZTE Plaza, No.19 East HuaYuan Road, HaiDian District Phone: +86-10-82963987 Email: wang.zhenyu1@zte.com.cn Feng Gao ZTE Technologies Co., Ltd. 12F, ZTE Plaza, No.19 East HuaYuan Road, HaiDian District Phone: +86-10-82963984 Email: gao.feng1@zte.com.cn 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. 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. Kang Expires March, 2009 [Page 21] Internet-Draft WDM Switched Optical Network Sep 2008 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. Kang Expires March, 2009 [Page 22]