ITU-T G 7713 3-2003 Distributed Call and Connection Management Signalling Mechanism using GMPLS CR-LDP SERIES G TRANSMISSION SYSTEMS AND MEDIA DIGITAL SYSTEMS AND NETWORKS Digital .pdf

1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.7713.3/Y.1704.3TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2003) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Operations, administration and maintenance features of transmission equipment SER

2、IES Y: GLOBAL INFORMATION INFRASTRUCTURE AND INTERNET PROTOCOL ASPECTS Internet protocol aspects Operation, administration and maintenance Distributed Call and Connection Management: Signalling mechanism using GMPLS CR-LDP ITU-T Recommendation G.7713.3/Y.1704.3 ITU-T G-SERIES RECOMMENDATIONS TRANSMI

3、SSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399

4、GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TESTING EQUIPMENTS G.500G.599 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TER

5、MINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMANCE G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DIGITAL TERMINAL EQUIPMENTS G.7000G.7999 General G.7000G.7099 Coding of analogue signals by puls

6、e code modulation G.7100G.7199 Coding of analogue signals by methods other than PCM G.7200G.7299 Principal characteristics of primary multiplex equipment G.7300G.7399 Principal characteristics of second order multiplex equipment G.7400G.7499 Principal characteristics of higher order multiplex equipm

7、ent G.7500G.7599 Principal characteristics of transcoder and digital multiplication equipment G.7600G.7699 Operations, administration and maintenance features of transmission equipment G.7700G.7799 Principal characteristics of multiplexing equipment for the synchronous digital hierarchy G.7800G.7899

8、 Other terminal equipment G.7900G.7999 DIGITAL NETWORKS G.8000G.8999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.7713.3/Y.1704.3 (03/2003) i ITU-T Recommendation G.7713.3/Y.1704.3 Distributed Call and Connection Management: Signalling mechanism using GMPLS CR

9、-LDP Summary This Recommendation specifies the signalling mechanism and protocol for distributed call and connection management based on GMPLS CR-LDP. This signalling protocol is applicable at the UNI, I-NNI and E-NNI and provides for automated call and connection operations relating to ASTN and ASO

10、N. Routing, DCN usage, and automatic discovery are beyond the scope of this Recommendation. Items covered in this Recommendation include: CR-LDP messages; CR-LDP attributes; and CR-LDP signal flows. This Recommendation meets the requirements of ITU-T Rec. G.7713/Y.1704 and is functionally similar to

11、 ITU-T Recs G.7713.1/Y.1704.1 and G.7713.2/Y.1704.2. Source ITU-T Recommendation G.7713.3 was approved by ITU-T Study Group 15 (2001-2004) under the ITU-T Recommendation A.8 procedure on 16 March 2003. History This Recommendation forms part of a suite of Recommendations covering the full functionali

12、ty of the automatic switched transport network (ASTN). Document history Issue Notes 0.1 Version 0.1 of G.7713.3/Y.1704.3 (05/2002) 0.2 New text on SPC, signal flow diagram, label scope, removed crankback 0.3 Revisions from drafting in Q14/15 interim meeting Ottawa Oct. 7-11, 2002 0.4 Editorial revis

13、ions for Geneva meeting in January 2003 0.5 Revisions based on contributions at the SG15 meeting in Geneva, January 2003. ii ITU-T Rec. G.7713.3/Y.1704.3 (03/2003) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. Th

14、e ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standa

15、rdization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information

16、technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Com

17、pliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other ob

18、ligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementa

19、tion of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As

20、of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged

21、to consult the TSB patent database. ITU 2003 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.7713.3/Y.1704.3 (03/2003) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terms and definitions . 2 4 Abbr

22、eviations and acronyms 3 5 Conventions 3 6 Assumptions . 4 7 Overview and applications . 4 7.1 CR-LDP overview 4 7.2 Support for basic call identifier 5 7.3 CR-LDP at UNI reference point. 5 7.4 CR-LDP at I-NNI reference point 5 7.5 CR-LDP at E-NNI reference point. 5 7.6 CR-LDP support for SPC . 6 7.

23、7 Defect handling 7 8 GMPLS CR-LDP messages 8 8.1 Call Setup message. 11 8.2 Call Release message . 12 8.3 Label Request message. 12 8.4 Label Mapping message. 12 8.5 Initialization message . 13 8.6 Hello message. 13 8.7 KeepAlive message 13 8.8 Label Release message. 13 8.9 Label Withdraw message .

24、 13 8.10 Label Abort message 13 8.11 Notification message 13 8.12 Query, Query Reply, and Partial Query reply messages 14 9 GMPLS CR-LDP attributes 16 9.1 Source Id TLV 16 9.2 Dest Id TLV 16 9.3 ER TLV 16 9.4 Call Id TLV 16 9.5 Call Capability TLV. 18 9.6 Generalized Label Request TLV 18 9.7 General

25、ized Label TLV 18 9.8 Upstream Label TLV 18 9.9 Acceptable Label TLV . 18 9.10 Label Set TLV 18 iv ITU-T Rec. G.7713.3/Y.1704.3 (03/2003) Page 9.11 Suggested Label Set TLV. 18 9.12 Admin Status TLV . 18 9.13 Contract Id TLV . 18 9.14 UNI Service TLV . 19 9.15 Feedback TLV 19 9.16 Local Connection Id

26、 TLV 19 9.17 Protection TLV. 19 9.18 Diversity TLV 19 9.19 Status TLV 19 9.20 Interface TLV . 19 10 Call and connection control procedures using CR-LDP. 19 10.1 CR-LDP discovery and session initialization. 19 10.2 Call setup using CR-LDP . 20 10.3 Call Release using CR-LDP . 22 10.4 Connection setup

27、 using CR-LDP . 23 10.5 Connection modification using CR-LDP . 24 10.6 Connection release using CR-LDP. 25 10.7 Feedback using CR-LDP 26 10.8 Failure detection and recovery in CR-LDP 27 11 Error sequences. 28 Annex A Technology-specific terminology updates 29 Annex B TLV code points 30 Annex C Label

28、 scope 30 C.1 Scope of the label . 30 C.2 A label association function . 31 Appendix I Mapping of messages. 32 I.1 Mapping of UNI messages . 32 I.2 Mapping of E-NNI messages . 32 Appendix II Mapping of attributes 33 II.1 Mapping of UNI attributes . 33 II.2 Mapping of E-NNI attributes 34 Appendix III

29、 Feedback list TLV. 35 ITU-T Rec. G.7713.3/Y.1704.3 (03/2003) 1 ITU-T Recommendation G.7713.3/Y.1704.3 Distributed Call and Connection Management: Signalling mechanism using GMPLS CR-LDP 1 Scope This Recommendation provides the signalling mechanism for distributed call and connection management (DCM

30、) using constraint-based routed label distribution protocol (CR-LDP). ITU-T Recs G.807/Y.1302 and G.8080/Y.1304 together specify the requirements and architecture for a dynamic optical network in which optical service is established using a control plane. ITU-T Rec. G.7713/Y.1704 specifies the detai

31、led requirements for the signalling procedures in the ASON control plane in a protocol-neutral manner. CR-LDP is a protocol within the Multi-Protocol Label Switching (MPLS) framework and is also recognized as a method of transporting IP over ATM in ITU-T Rec. Y.1310. Extensions to the scope of MPLS

32、to include TDM switching and transport, and optical multiplexing hierarchies are contained in the Generalized MPLS (GMPLS) framework of which there is a protocol neutral functional description. GMPLS CR-LDP referred to in this Recommendation is CR-LDP adapted to the GMPLS framework. In this Recommen

33、dation, the use of the term “GMPLS“ refers only to a framework and functional description. The term “GMPLS CR-LDP“, or simply “CR-LDP“, refers to a specific protocol that was developed within the GMPLS framework. Extensions to GMPLS CR-LDP were developed for the OIF UNI-01.0 specification. This Reco

34、mmendation describes the use of the GMPLS CR-LDP protocol as an instantiation of data call and connection management (ITU-T Rec. G.7713/Y.1704) within the ASON (ITU-T Rec. G.8080/Y.1304) framework. It covers the use of CR-LDP for basic call/connection procedures, messages, and signalling over the va

35、rious reference points. Extensions to GMPLS CR-LDP for compliance to ITU-T Rec. G.7713/Y.1704 are also included in this Recommendation. Routing, DCN usage, and automatic discovery are beyond the scope of this Recommendation. This Recommendation initially focuses on the support of Soft Permanent Conn

36、ections (SPC) services. Protocol specifications to support basic switched connections (SC) services are also included. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the

37、time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below.

38、 A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Recommendation E.360.1 (2002), Framework for QoS routing and related traffic engineer

39、ing methods for IP-, ATM-, and TDM-based multiservice networks. ITU-T Recommendation G.703 (2001), Physical/electrical characteristics of hierarchical digital interfaces. ITU-T Recommendation G.707/Y.1322 (2000), Network node interface for the Synchronous Digital Hierarchy (SDH). 2 ITU-T Rec. G.7713

40、.3/Y.1704.3 (03/2003) ITU-T Recommendation G.709/Y.1331 (2003), Interfaces for the Optical Transport Network (OTN). ITU-T Recommendation G.803 (2000), Architecture of transport networks based on the Synchronous Digital Hierarchy (SDH). ITU-T Recommendation G.805 (2000), Generic functional architectu

41、re of transport networks. ITU-T Recommendation G.807/Y.1302 (2001), Requirements for the Automatic Switched Transport Network (ASTN). ITU-T Recommendation G.872 (2001), Architecture of optical transport networks. ITU-T Recommendation G.7713/Y.1704 (2001), Distributed Call and Connection Management (

42、DCM). ITU-T Recommendation G.7714/Y.1705 (2001), Generalized automatic discovery techniques. ITU-T Recommendation G.8080/Y.1304 (2001), Architecture of the Automatically Switched Optical Network (ASON). ITU-T Recommendation T.50 (1992), International Reference Alphabet (IRA) (Formerly International

43、Alphabet No. 5 or IA5) Information technology 7-bit coded character set for information interchange. ITU-T Recommendation Y.1310 (2000), Transport of IP over ATM in public networks. IETF RFC 3036 (2001), LDP specification. IETF RFC 3212 (2002), Constraint-Based LSP setup using LDP. IETF RFC 3471 (20

44、03), Generalized Multi-Protocol Label Switching (GMPLS) Signalling Functional Description. IETF RFC 3472 (2003), Generalized Multi-Protocol Label Switching (GMPLS) Signalling Constraint-based Routed Label Distribution Protocol (CR-LDP) Extensions. IETF RFC 3480 (2003), Signalling Unnumbered Links in

45、 CR-LDP (Constraint-Routing Label Distribution Protocol). IETF RFC 3479 (2003), Fault tolerance for the Label Distribution Protocol (LDP). IETF RFC 3478 (2003), Graceful Restart Mechanism for Label Distribution Protocol. OIF UNI-01.0 (2001), User Network Interface (UNI) 1.0 signalling specification.

46、 3 Terms and definitions The following terms are defined in ITU-T Rec. G.8080/Y.1304: connection controller; link resource manager; subnetwork point; protocol controller; routing controller; subnetwork point pool. ITU-T Rec. G.7713.3/Y.1704.3 (03/2003) 3 The following term are defined in ITU-T Rec.

47、G.807/Y.1302: Soft permanent connection This Recommendation defines the following terms: 3.1 hello: A message sent by a signalling protocol controller to advertise its presence to other signalling protocol controllers. 3.2 CR-LDP peers: Two protocol controllers implementing CR-LDP that have establis

48、hed communication with each other. 3.3 CR-LDP session: The control communication instance between two CR-LDP peers. 3.4 label: This term is the same as a G.8080/Y.1304 SNP. 3.5 downstream on demand: A label advertisement procedure by which the upstream node is responsible for requesting the label ma

49、pping. 3.6 ordered control mode: A node initiates the transmission of a label mapping only when the label mapping from the downstream node is received. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations: ASON Automatic Switched Optical Network CR-LDP Constraint-based Routed Label Distribution Protocol DCN Data Communications Network E-NNI Exterior NNI GMPLS Generalized Multi-Protocol Label Switching I-NNI Interior NNI ISO International Organization f