1、 International Telecommunication Union ITU-T G.7712/Y.1703TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2008) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Data over Transport Generic aspects Transport network control aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE
2、, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Operation, administration and maintenance Architecture and specification of data communication network Recommendation ITU-T G.7712/Y.1703 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS
3、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 GENERAL CHARACTERISTICS OF INTERNATIONAL
4、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 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G
5、.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 General G.7000G.7099 Transport network control aspects G.7700G.77
6、99 PACKET OVER TRANSPORT ASPECTS G.8000G.8999ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE
7、 General Y.100Y.199 Services, applications and middleware Y.200Y.299 Network aspects Y.300Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.800Y.899 INTERNET PROTOCOL ASPECTS G
8、eneral Y.1000Y.1099 Services and applications Y.1100Y.1199 Architecture, access, network capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1699 Operation, administration and ma
9、intenance Y.1700Y.1799 Charging Y.1800Y.1899 NEXT GENERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilities and service architecture Y.2200Y.2249 Service aspects: Interoperability of services a
10、nd networks in NGN Y.2250Y.2299 Numbering, naming and addressing Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 For further details, please refer to the list of ITU-T Recommendations. Rec.
11、ITU-T G.7712/Y.1703 (06/2008) i Recommendation ITU-T G.7712/Y.1703 Architecture and specification of data communication network Summary Recommendation ITU-T G.7712/Y.1703 defines the architecture requirements for a data communication network (DCN) which may support distributed management communicati
12、ons related to the telecommunication management network (TMN), distributed control plane communications (e.g., signalling and routing) related to the automatically switched optical network (ASON), and other distributed communications (e.g., orderwire or voice communications, software download). The
13、DCN architecture considers networks that are IP-only, OSI-only, and mixed (i.e., support both IP and OSI). The interworking between parts of the DCN supporting IP-only, parts supporting OSI-only, and parts supporting both IP and OSI are also specified. Various applications (e.g., TMN, ASON, etc.) re
14、quire a packet-based communications network to transport information between various components. For example, the TMN requires a communications network, which is referred to as the management communication network (MCN) to transport management messages between TMN components (e.g., NEF component and
15、 OSF component). ASON requires a communication network which is referred to as the signalling communication network (SCN) to transport signalling and routing messages between ASON components (e.g., CC components and RC components). This Recommendation specifies data communication functions that can
16、be used to support one or more applications communication network. The data communication functions provided in the 11/2001 version of this Recommendation support connection-less network services. The 03/2003 revision of the Recommendation adds the support of connection-oriented network SCN services
17、 by including specific MPLS-based mechanism. This 2008 revision of the Recommendation adds the requirements of the OTN ECC data-link layer termination function and the transport MPLS (T-MPLS) SCC data link layer termination function. Note that the MPLS-related data communication functions specified
18、in this Recommendation (e.g., protection, termination, encapsulation, interworking, etc.) may need to be modified in order to be aligned with IETF MPLS-TP (Transport Profile), which is being worked on at the time of publication of the revision of this Recommendation. This Recommendation forms part o
19、f a family of Recommendations covering transport networks. Source Recommendation ITU-T G.7712/Y.1703 was approved on 22 June 2008 by ITU-T Study Group 15 (2005-2008) under Recommendation ITU-T A.8 procedure. Keywords Data communication network, Internet protocol (IP), open system interface (OSI). ii
20、 Rec. ITU-T G.7712/Y.1703 (06/2008) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ o
21、f 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 Standardization Assembly (WTSA), which meets every four years, establishes the topi
22、cs 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 technology which fall within ITU-Ts purview, the necessary standards are prep
23、ared 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. Compliance with this Recommendation is voluntary. However, the Recommendation ma
24、y 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 obligatory language such as “must“ and the negative equivalents are used to exp
25、ress 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 implementation of this Recommendation may involve the use of a claimed Intellectual Pro
26、perty 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 of the date of approval of this Recommendation, ITU had received notice of in
27、tellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2009 All
28、rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.7712/Y.1703 (06/2008) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terms and definitions . 4 3.1 Terms defined elsewhere 4 3.2 Terms defined in this Rec
29、ommendation. 5 4 Abbreviations 6 5 Conventions 8 6 DCN characteristics 8 6.1 TMN application 10 6.2 ASON application 16 6.3 Other applications requiring communication networks . 24 6.4 Separation of various applications 24 7 DCN functional architecture and requirements 24 7.1 Specification of data c
30、ommunication functions . 25 7.2 Provisioning requirements 39 7.3 Security requirements. 39 Annex A Requirements for three-way handshaking. 40 A.1 Point-to-point three-way adjacency TLV. 40 A.2 Adjacency three-way state 40 Annex B Requirements for automatic encapsulation 42 B.1 Introduction 42 B.2 Sc
31、ope 42 B.3 Description of the AE-DCF 42 B.4 Requirements and limitations. 44 Appendix I Constraints of the interworking functions in DCN 55 I.1 General assumptions. 55 I.2 Common to all scenarios 55 Appendix II Example implementation of automatic encapsulation 58 II.1 Introduction 58 II.2 Updates to
32、 Dijkstras algorithm 58 Appendix III Commissioning guide for SDH NEs in dual RFC 1195 environment and impact of automatic encapsulation option 63 III.1 Introduction 63 III.2 Integrated IS-IS without automatic encapsulation . 63 III.3 Integrated IS-IS with automatic encapsulation. 66 iv Rec. ITU-T G.
33、7712/Y.1703 (06/2008) Page Appendix IV Example illustration of packet 1+1 protection 70 IV.1 Packet 1+1 protection overview . 70 IV.2 Packet 1+1 protection illustration. 70 IV.3 Operation of selector algorithm under various failure scenarios 72 Bibliography. 77 Rec. ITU-T G.7712/Y.1703 (06/2008) 1 R
34、ecommendation ITU-T G.7712/Y.1703 Architecture and specification of data communication network 1 Scope This Recommendation defines the architecture requirements for a data communication network (DCN) which may support distributed management communications related to the telecommunication management
35、network (TMN), distributed control plane communications (e.g., signalling and routing) related to the automatically switched optical network (ASON), and other distributed communications (e.g., orderwire or voice communications, software download). The DCN architecture considers networks that are IP-
36、only, OSI-only, and mixed (i.e., support both IP and OSI). The interworking between parts of the DCN supporting IP-only, parts supporting OSI-only, and parts supporting both IP and OSI are also specified. The DCN provides Layer 1 (physical), Layer 2 (data-link) and Layer 3 (network) functionality an
37、d consists of routing/switching functionality interconnected via links. These links can be implemented over various interfaces, including wide area network (WAN) interfaces, local area network (LAN) interfaces, and embedded communication channels (ECCs). Various applications (e.g., TMN, ASON, etc.)
38、require a packet-based communication network to transport information between various components. For example, the TMN requires a communication network, which is referred to as the management communication network (MCN) to transport management messages between TMN components (e.g., NEF component and
39、 OSF component). ASON requires a communication network, which is referred to as the signalling communication network (SCN) to transport signalling and routing messages between ASON components (e.g., CC components and RC components). This Recommendation specifies data communication functions that can
40、 be used to support one or more applications communication network. The data communication functions provided in this Recommendation support connection-less network services. Additional functions may be added in future versions of this Recommendation to support connection-oriented network services.
41、This 2008 revision of the Recommendation adds the definition of the OTN ECC data-link layer termination function and the transport MPLS (T-MPLS) SCC data link layer termination function. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference
42、 in this text, constitute provisions of this Recommendation. At the 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 rece
43、nt edition of the Recommendations and other references listed below. 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 G.707 Recommendat
44、ion ITU-T G.707/Y.1322 (2000), Network node interface for the synchronous digital hierarchy (SDH). ITU-T G.709 Recommendation ITU-T G.709/Y.1331 (2003), Interfaces for the Optical Transport Network (OTN). ITU-T G.783 Recommendation ITU-T G.783 (2000), Characteristics of synchronous digital hierarchy
45、 (SDH) equipment functional blocks. 2 Rec. ITU-T G.7712/Y.1703 (06/2008) ITU-T G.784 Recommendation ITU-T G.784 (1999), Synchronous digital hierarchy (SDH) management. ITU-T G.798 Recommendation ITU-T G.798 (2002), Characteristics of optical transport network hierarchy equipment functional blocks. I
46、TU-T G.872 Recommendation ITU-T G.872 (2001), Architecture of optical transport networks. ITU-T G.874 Recommendation ITU-T G.874 (2001), Management aspects of the optical transport network element. ITU-T G.7710 Recommendation ITU-T G.7710/Y.1701 (2001), Common equipment management function requireme
47、nts. ITU-T G.8021 Recommendation ITU-T G.8021/Y.1341 (2004), Characteristics of Ethernet transport network equipment functional blocks. ITU-T G.8051 Recommendation ITU-T G.8051/Y.1345 (2007), Management aspects of the Ethernet-over-Transport (EoT) capable network element. ITU-T G.8080 Recommendation
48、 ITU-T G.8080/Y.1304 (2006), Architecture for the automatically switched optical network (ASON). ITU-T G.8081 Recommendation ITU-T G.8081/Y.1353 (2004), Terms and definitions for Automatically Switched Optical Networks (ASON). ITU-T G.8110.1 Recommendation ITU-T G.8110.1/Y.1370.1 (2006), Architectur
49、e of Transport MPLS (T-MPLS) layer network. ITU-T G.8121 Recommendation ITU-T G.8121/Y.1381 (2006), Characteristics of Transport MPLS equipment functional blocks. ITU-T G.8151 Recommendation ITU-T G.8151/Y.1374 (2007), Management aspects of the T-MPLS network element. ITU-T M.3010 Recommendation ITU-T M.3010 (2000), Principles for a telecommunications management network. ITU-T M.3013 Recommendation ITU-T M.3013 (2000), Considerations for a telecommunications management network. ITU-T M.301
