Network Working Group Fatai Zhang Internet Draft Huawei Category: Standards Track Expires: Jan 2010 July 5, 2009 Generalized Multi-Protocol Label Switching (GMPLS) Signaling Extensions for the evolving G.709 Optical Transport Networks Control draft-zhang-ccamp-gmpls-evolving-g709-00.txt Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." 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 January 5, 2010. Abstract Recent revisions of ITU-T Recommendation G.709 have introduced new features for Optical Transport Networks (OTN) ODU0, ODU4, ODU2e, ODU3e1, ODU3e2 and ODUflex. Several recent documents have proposed ways to modify GMPLS signaling protocols to support the new OTN features. It is important that a single solution is developed for use in GMPLS signaling and routing protocols. This solution must address all of zhang Expires January 2010 [Page 1] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 the new features, must be acceptable to all equipment vendors, and must be extensible for the evolving OTN. This document describes the extensions to the Generalized Multi- Protocol Label Switching (GMPLS) signaling to control the evolving Optical Transport Networks (OTN) with new features including ODU0, ODU4, ODU2e, ODU3e1, ODU3e2 and ODUflex. 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 [RFC2119]. Table of Contents 1. Introduction.................................................2 2. Terminology..................................................3 3. GMPLS Extensions for the Evolving G.709 - Overview...........3 4. Generalized Label............................................6 4.1. New definition of ODUk label............................6 4.2. Examples................................................8 4.3. Label Distribution Procedure............................9 5. Security Considerations.....................................10 6. IANA Considerations.........................................10 7. Acknowledgments.............................................10 8. References..................................................10 8.1. Normative References...................................10 8.2. Informative References.................................11 9. Author's Addresses..........................................11 10. Contributors...............................................11 1. Introduction Generalized Multi-Protocol Label Switching (GMPLS) [RFC3945] extends MPLS to include Layer-2 Switching (L2SC), Time-Division Multiplex (e.g., SONET/SDH, PDH, and G.709), Wavelength (Lambdas) Switching, and Spatial Switching (e.g., incoming port or fiber to outgoing port or fiber). [RFC3471] presents a functional description of the extensions to Multi-Protocol Label Switching (MPLS) signaling required to support Generalized MPLS. RSVP-TE-specific formats and mechanisms and technology specific details are specified in [RFC3473]. With the maturity and deployment of G.709 technology, it is necessary that there should be a kind of control technology for G.709. [RFC4328] Zhang Expires January 2010 [Page 2] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 describes the control technology details that are specific to G.709 Optical Transport Networks (OTN) as specified in the ITU-T G.709 recommendation [ITUT-G709]. However, with the evolution of OTN, there are some new features introduced in ITU-T, for example, ODU0, ODU2e,ODU4 are described in [G709-Amd3] and ODU3e1, ODU3e2 are described in [Gsup43] and ODUflex is under being developed in [G709draft-v3]. Therefore, it is obvious that [RFC4328] can not support these new features of OTN from control plane perspective, and it should be updated or replaced to support the evolving OTN. This document extends the G.709 traffic parameters described in [RFC4328] and also presents a new OTN label format which is very flexible, efficient and understandable. 2. Terminology 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 [RFC2119]. 3. GMPLS Extensions for the Evolving G.709 - Overview The new features for the evolving OTN are described in the separate ITU-T documents, for example, ODU0, ODU2e,ODU4 are described in [G709-Amd3] and ODU3e1, ODU3e2 are described in [Gsup43] and ODUflex is under being developed in [G709draft-v3]. The new signal types of digital wrapper layer for the evolving OTN are listed as follows: - Optical Channel Transport Unit (OTUk): . OTU4 . OTU2e . OTU3e1 . OTU3e2 - Optical Channel Data Unit (ODUk): . ODU0 . ODU2e Zhang Expires January 2010 [Page 3] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 . ODU3e1 . ODU3e2 . ODU4 . ODUflex A new Tributary Slot (TS) granularity (i.e., 1.25 Gbps) is introduced for ODU0, ODU4, ODU3e2 and ODUflex, so there are two TS granularities for the original ODU1, ODU2, ODU3 because it should keep the compatibility. It also defines the new multiplexing hierarchy for the evolving OTN except that the new signal types are introduced. In addition to the support of ODUk mapping into OTUk (k = 1, 2, 2e, 3, 3e1, 3e2, 4), G.709 supports ODUk multiplexing. For the evolving OTN, the multiplexing of ODUj (j = 0, 1, 2, 2e, 3, flex) into an ODUk (k > j) signal is as follows: - ODU0 into ODU1 multiplexing - ODU0, ODU1, ODUflex into ODU2 multiplexing (with 1.25Gbps TS granularity) - ODU1 into ODU2 multiplexing (with 2.5Gbps TS granularity) - ODU0, ODU1, ODU2, ODU2e and ODUflex into ODU3 multiplexing (with 1.25Gbps TS granularity) - ODU1, ODU2 into ODU3 multiplexing (with 2.5Gbps TS granularity) - ODU0, ODU1, ODU2, ODU2e, ODU3 and ODUflex into ODU4 multiplexing (with 1.25Gbps TS granularity) - ODU2e into ODU3e1 multiplexing (with 2.5Gbps TS granularity) - ODU2e into ODU3e2 multiplexing (with 1.25Gbps TS granularity) [RFC4328] describes GMPLS signaling extensions to support the control for G.709 Optical Transport Networks (OTN) [ITUT-G709].However, [RFC4328] can not support these new features of the evolving OTN from control plane perspective, and it should be updated or replaced to support the control for the evolving OTN. This document extends the G.709 traffic parameters described in [RFC4328] and also presents a new OTN label format which is very flexible, efficient and understandable. Zhang Expires January 2010 [Page 4] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 Extensions for Traffic Parameters for the Evolving G.709 The traffic parameters for G.709 are defined in [RFC4328] 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Signal Type | Reserved | NMC | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | NVC | Multiplier (MT) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ It is obvious that the Signal Type should be extended to cover the new Signal Type introduced by the evolving OTN. The new Signal Type is extended as follows: Value Type ----- ---- 0 Not significant 1 ODU1 (i.e., 2.5 Gbps) 2 ODU2 (i.e., 10 Gbps) 3 ODU3 (i.e., 40 Gbps) 4 ODU4 (i.e., 100 Gbps) 5 Reserved (for future use) 6 OCh at 2.5 Gbps 7 OCh at 10 Gbps 8 OCh at 40 Gbps 9 OCh at 100 Gbps 10~19 Reserved (for future use) 20 ODU0 (i.e., 1.25 Gbps) 21~30 Reserved (for future use) 31 ODU2e (i.e., 10Gbps for FC1200 and GE LAN) 32 ODU3e1 33 ODU3e2 34 ODUflex (i.e., 1.25*N Gbps) 35~255 Reserved (for future use) Zhang Expires January 2010 [Page 5] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 4. Generalized Label [RFC3471] has defined the Generalized Label which extends the traditional label by allowing the representation of not only labels which travel in-band with associated data packets, but also labels which identify time-slots, wavelengths, or space division multiplexed positions. The format of the corresponding RSVP-TE Generalized Label object is defined in the Section 2.3 of [RFC3473]. However, for different technologies, we usually need use specific label rather than the Generalized Label. For example, the label format described in [RFC4606] could be used for SDH/SONET, the label format in [RFC4328] for G.709. According to the ODUk label format defined in [RFC4328], it may have some difficulties in extensibility. When ODU3 maps to ODU4, or ODUflex maps to ODU4, lots of labels are requested, which brings complicated signaling process. For example, when ODU3 is mapped into ODU4 with 1.25G tributary slots, it will need thirty-two labels (32*4*8=1024 bits) to be allocated for one ODU3 connection. If ODUflex into ODU4, it may need eighty labels (80*4*8=2560 bits) to be allocated for one ODUflex connection. In this document, a new ODUk label format is defined. The new ODUk label format is very flexible, efficient and understandable. 4.1. New definition of ODUk label In order to be compatible with new types of ODU signal and new types of tributary slot, the following new ODUk label format is defined: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ODUj |OD(T)Uk| T | Reserved | Bit Map | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ......... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ODUj and OD(T)Uk (4 bits respectively): indicate that ODUj is multiplexed into ODUk(k>j), or ODUj is mapped into OTUk (j=k). ODUj field Signal type ---------- ----------- 0 ODU0 Zhang Expires January 2010 [Page 6] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 1 ODU1 2 ODU2 3 ODU3 4 ODU4 5 ODU2e 6 ODU3e1 7 ODU3e2 8-15 Reserved (for future use) OD(T)Uk field Signal type ---------- ----------- 0 Reserved (for future use) 1 ODU1/OTU1 2 ODU2/OTU2 3 ODU3/OTU3 4 ODU4/OTU4 5 OTU2e 6 OTU3e1 7 OTU3e2 8-15 Reserved (for future use) T (2 bits): indicates the type of tributary slot of OD(T)Uk. Currently, two types of tributary slot are defined in [G.709], the 1.25Gbps tributary slot and the 2.5Gbps tributary slot. T field TS type ------- ------- 0 1.25Gbps TS granularity 1 2.5Gbps TS granularity 2-3 Reserved (for future use) Bit Map (variable): indicates which tributary slots in ODUk that the ODUj will be multiplexed into. The sequence of the Bit Map is consistent with the sequence of the tributary slots in ODUk. Each bit in the bit map represents the corresponding tributary slot in ODUk with a value of 1 or 0 indicating whether the tributary slot will be used by ODUj or not. The size of the bit map equals to the total number of the tributary slots of ODUk. Zhang Expires January 2010 [Page 7] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 Padded bits are added behind the Bit Map to make the whole label a multiple of four bytes if necessary. Padded bit MUST be set to 0 and MUST be ignored. In case of an ODUk mapped into OTUk, it's no need to indicate which tributary slots will be used by ODUk, so the size of Bit Map is 0. 4.2. Examples The following examples are given in order to illustrate the label format described in the previous sections of this document. 1. ODUk in OTUk mapping: In such conditions, the downstream node along an LSP returns a label indicating that the ODU1 (ODU2 or ODU3 or ODU4) is directly mapped into the corresponding OTU1 (OTU2 or OTU3 or ODU4). The following example label indicates an ODU1 mapped into OTU1 with 2.5Gbps TS granularity. 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 0 1|0 0 0 1|0 1| Reserved | Padded Bits (0) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 2. ODUj into ODUk multiplexing: In such conditions, this label indicates that an ODUj is multiplexed into several tributary slots of OPUk and then mapped into OTUk. Some instances are shown as follow: - ODU0 into ODU2 Multiplexing: 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 0 0|0 0 1 0|0 0| Reserved |0 1 0 0 0 0 0 0|Padded Bits (0)| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ This above label indicates an ODU0 multiplexed into the second tributary slot of ODU2, wherein the type of the tributary slot is 1.25Gbps. Zhang Expires January 2010 [Page 8] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 - ODU1 into ODU2 Multiplexing with 1.25Gbps TS granularity: 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 0 1|0 0 1 0|0 0| Reserved |0 1 0 1 0 0 0 0|Padded Bits (0)| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ This above label indicates an ODU1 multiplexed into the 2nd, 4th tributary slot of ODU2, wherein the type of the tributary slot is 1.25Gbps. - ODU2 into ODU3 Multiplexing with 2.5Gbps TS granularity: 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 1 0|0 0 1 1|0 1| Reserved |0 1 1 0 1 0 1 0 0 0 0 0 0 0 0 0| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ This above label indicates an ODU2 multiplexed into the 2nd, 3rd, 5th and 7th tributary slot of ODU3, wherein the type of the tributary slot is 2.5Gbps. 4.3. Label Distribution Procedure This document does not change the existing label distribution procedures [RFC4328] for GMPLS except that the new ODUk label should be processed as follows. When a node receives a generalized label request for setting up an ODUj LSP from its upstream node, the node should generate an ODU label according to the signal type of the requested LSP and the free resources (i.e., free tributary slots of ODUk) that will be reserved for the LSP, and send the label to its upstream node. Note that these labels can also be specified by the source node of the connection. In case of ODUj to ODUk multiplexing, the node should firstly determine the size of the Bit Map field according to the signal type and the tributary slot type of ODUk, and then set the bits to 1 in the Bit Map field corresponding to the reserved tributary slots. Zhang Expires January 2010 [Page 9] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 In case of ODUk to OTUk mapping, the node only needs to fill the ODUj and the ODUk fields with corresponding values in the label. Other bits are reserved and MUST be set to 0. When receiving an ODU label from its downstream node, the node should learn which ODU signal type is multiplexed or mapped into which ODU signal type by analyzing the ODUj and the ODUk fields. In case of ODUj to ODUk multiplexing, the node should firstly determine the size of the Bit Map field according to the signal type and the tributary slot type of ODUk, and then obtain which tributary slots in ODUk are reserved by its downstream node according to the position of the bits that are set to 1 in the Bit Map field, so that the node can multiplex the ODUj into the reserved tributary slots of ODUk after the LSP is established. In case of ODUk to OTUk mapping, the size of Bit Map field is 0 and no additional procedure is needed. 5. Security Considerations TBD. 6. IANA Considerations TBD. 7. Acknowledgments TBD. 8. References 8.1. Normative References [RFC4328] D. Papadimitriou, Ed. "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Extensions for G.709 Optical Transport Networks Control", RFC 4328, Jan 2006. [RFC3471] Berger, L., Editor, "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3471, January 2003. Zhang Expires January 2010 [Page 10] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 [RFC3473] L. Berger, Ed., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Extensions", RFC 3473, January 2003. [RFC3945] Mannie, E., "Generalized Multi-Protocol Label Switching (GMPLS) Architecture", RFC 3945, October 2004. 8.2. Informative References [ITUT-G709] ITU-T, "Interface for the Optical Transport Network (OTN)," G.709 Recommendation (and Amendment 1), February 2001 (October 2001). [G709-Amd3] ITU-T, "Interface for the Optical Transport Network (OTN)," G.709 Recommendation Amendment3), December 2008. [Gsup43] ITU-T, " Proposed revision of G.sup43 (for agreement),", December 2008. [G709draft-v3] ITU-T, "Draft revised G.709, version 3,", May 2009. 9. Author's Addresses Fatai Zhang Huawei Technologies Co., Ltd. F3-5-B R&D Center, Huawei Base, Bantian, Longgang District Shenzhen 518129 P.R.China Phone: +86-755-28972912 Email: zhangfatai@huawei.com 10. Contributors Yi Lin Huawei Technologies Co., Ltd. F3-5-B R&D Center, Huawei Base, Zhang Expires January 2010 [Page 11] draft-zhang-ccamp-gmpls-evolving-g709-00.txt July 2009 Bantian, Longgang District Shenzhen 518129 P.R.China Phone: +86-755-28972914 Email: linyi_hw@huawei.com Yunbin Xu China Academy of Telecommunication Research of MII 11 Yue Tan Nan Jie Beijing, P.R.China Phone: +86-10-68094134 Email: xuyunbin@mail.ritt.com.cn Guoying Zhang China Academy of Telecommunication Research of MII 11 Yue Tan Nan Jie Beijing, P.R.China Phone: +86-10-68094272 Email: zhangguoying@mail.ritt.com.cn Intellectual Property The IETF Trust takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in any IETF Document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. 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