1、 International Telecommunication Union ITU-T G.7712/Y.1703TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (09/2010) 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 MULTIMEDIA 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
6、 G.7700G.7799PACKET OVER TRANSPORT ASPECTS G.8000G.89ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.7712/Y.1703 (09/2010) i Recommendation ITU-T G.7712/Y.1703 Architecture and specification of data communication network Summary Recom
7、mendation ITU-T G.7712/Y.1703 defines the architecture requirements for a data communication network (DCN) which may support distributed management communications related to the telecommunication management network (TMN), distributed control plane communications (e.g., signalling and routing) relate
8、d to the automatically switched optical network (ASON), distributed control plane communications (e.g., signalling and routing) related to multiprotocol label switching transport profile (MPLS-TP), and other distributed communications (e.g., orderwire or voice communications, software download). The
9、 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 other protocols (other than IP or OSI) are outs
10、ide the current scope of this Recommendation. Various applications (e.g., TMN, ASON, etc.) require 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 n
11、etwork (MCN) to transport management messages between TMN components (e.g., network element function (NEF) component and operations system function (OSF) component). ASON and MPLS-TP require communication networks, which are referred to as the signalling communication networks (SCNs) to transport si
12、gnalling and routing messages between functional control plane components (e.g., connection controller (CC) components and routing controller (RC) components). This Recommendation specifies data communication functions that can be used to support one or more applications communication network. The d
13、ata communication functions provided in the 11/2001 version of this Recommendation support connectionless network services. The 03/2003 revision of this Recommendation adds the support of connection-oriented network SCN services by including a specific MPLS-based mechanism. This 2010 revision of thi
14、s Recommendation provides the requirements for the MPLS transport profile (MPLS-TP) signalling communication channel (SCC) and management communication channel (MCC) data communication functions. The part of this Recommendation that addresses MPLS for transport networks complies with the transport p
15、rofile of MPLS architecture as defined by IETF. In the event of a difference between this ITU-T Recommendation and any of the normatively referenced RFCs for MPLS-TP, the RFCs will take precedence. This Recommendation forms part of a family of Recommendations covering transport networks. History Edi
16、tion Recommendation Approval Study Group 1.0 ITU-T G.7712/Y.1703 2001-11-29 15 2.0 ITU-T G.7712/Y.1703 2003-03-16 15 3.0 ITU-T G.7712/Y.1703 2008-06-22 15 4.0 ITU-T G.7712/Y.1703 2010-09-06 15 Keywords Data communication network, Internet protocol (IP), open system interface (OSI). ii Rec. ITU-T G.7
17、712/Y.1703 (09/2010) 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 of ITU. ITU-T is
18、 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 topics for study by
19、 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 prepared on a colla
20、borative 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 may contain certa
21、in 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 express requirem
22、ents. 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 Property Right.
23、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 intellectual pr
24、operty, 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 2011 All rights reserv
25、ed. 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 (09/2010) iii Table of 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 Recomme
26、ndation . 5 4 Abbreviations 5 5 Conventions 8 6 DCN characteristics 9 6.1 TMN application 11 6.2 Control plane application (ASON and MPLS-TP) . 17 6.3 Other applications requiring communication networks . 25 6.4 Separation of various applications 25 7 DCN functional architecture and requirements 25
27、7.1 Specification of data communication functions . 26 7.2 Provisioning requirements 43 7.3 Security requirements . 43 Annex A Requirements for three-way handshaking . 44 A.1 Point-to-point three-way adjacency TLV . 44 A.2 Adjacency three-way state 44 Annex B Requirements for automatic encapsulation
28、 46 B.1 Introduction 46 B.2 Scope 46 B.3 Description of the AE-DCF 46 B.4 Requirements and limitations . 48 Annex C MPLS-TP to SCC and MCC adaptation functions 59 C.1 MT/SCC_A adaptation function . 59 C.2 MT/MCC_A adaptation function . 62 Appendix I Constraints of the interworking functions in DCN 6
29、5 I.1 General assumptions . 65 I.2 Common to all scenarios 65 Appendix II Example implementation of automatic encapsulation 68 II.1 Introduction 68 II.2 Updates to Dijkstras algorithm 69 iv Rec. ITU-T G.7712/Y.1703 (09/2010) Page Appendix III Commissioning guide for SDH NEs in dual IETF RFC 1195 env
30、ironment and impact of automatic encapsulation option 73 III.1 Introduction 73 III.2 Integrated IS-IS without automatic encapsulation . 73 III.3 Integrated IS-IS with automatic encapsulation . 76 Appendix IV Example illustration of packet 1+1 protection 80 IV.1 Packet 1+1 protection overview . 80 IV
31、.2 Packet 1+1 protection illustration . 80 IV.3 Operation of selector algorithm under various failure scenarios 82 Bibliography. 87 Rec. ITU-T G.7712/Y.1703 (09/2010) 1 Recommendation ITU-T G.7712/Y.1703 Architecture and specification of data communication network 1 Scope This Recommendation defines
32、 the architecture requirements for a data communication network (DCN) which may support distributed management communications related to the telecommunication management network (TMN), distributed control plane communications (e.g., signalling and routing) related to the automatically switched optic
33、al network (ASON), distributed control plane communications (e.g., signalling and routing) related to multiprotocol label switching transport profile (MPLS-TP), and other distributed communications (e.g., orderwire or voice communications, software download). The DCN architecture considers networks
34、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 other protocols (other than IP or OSI) are outside the current scope of this Recomme
35、ndation. The DCN provides Layer 1 (physical), Layer 2 (data-link) and Layer 3 (network) functionality and 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 (LA
36、N) interfaces, and embedded communication channels (ECCs). Various applications (e.g., TMN, ASON, etc.) 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 comm
37、unication network (MCN) to transport management messages between TMN components (e.g., network element function (NEF) component and operations support function (OSF) component). ASON and MPLS-TP require communication networks, which are referred to as signalling communication networks (SCNs) to tran
38、sport signalling and routing messages between functional control plane components (e.g., connection controller (CC) components and routing controller (RC) components). This Recommendation specifies data communication functions that can be used to support one or more applications communication networ
39、k. The data communication functions provided in this Recommendation support connectionless network services. Additional functions may be added in future versions of this Recommendation to support connection-oriented network services. This 2010 revision of this Recommendation provides the requirement
40、s for the MPLS transport profile (MPLS-TP) signalling communication channel (SCC) and management communication channel (MCC) data communication functions. The part of this Recommendation that addresses MPLS for transport networks complies with the transport profile of MPLS architecture as defined by
41、 IETF. In the event of a difference between this ITU-T Recommendation and any of the normatively referenced RFCs for MPLS-TP, the RFCs will take precedence. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute prov
42、isions 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 recent edition of the Recommendati
43、ons 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. 2 Rec. ITU-T G.7712/Y.1703 (09/2010) ITU-T G.707 Reco
44、mmendation ITU-T G.707/Y.1322 (2007), Network node interface for the synchronous digital hierarchy (SDH). ITU-T G.709 Recommendation ITU-T G.709/Y.1331 (2009), Interfaces for the Optical Transport Network (OTN). ITU-T G.783 Recommendation ITU-T G.783 (2006), Characteristics of synchronous digital hi
45、erarchy (SDH) equipment functional blocks. ITU-T G.784 Recommendation ITU-T G.784 (2008), Management aspects of synchronous digital hierarchy (SDH) transport network elements. ITU-T G.798 Recommendation ITU-T G.798 (2010), Characteristics of optical transport network hierarchy equipment functional b
46、locks. ITU-T G.872 Recommendation ITU-T G.872 (2001), Architecture of optical transport networks, Amendment 1 (2003). ITU-T G.874 Recommendation ITU-T G.874 (2010), Management aspects of optical transport network elements. ITU-T G.7710 Recommendation ITU-T G.7710/Y.1701 (2007), Common equipment mana
47、gement function requirements, Amendment 1 (2010). ITU-T G.8021 Recommendation ITU-T G.8021/Y.1341 (2010), Characteristics of Ethernet transport network equipment functional blocks. ITU-T G.8051 Recommendation ITU-T G.8051/Y.1345 (2009), Management aspects of the Ethernet-over-Transport (EoT) capable
48、 network element. ITU-T G.8080 Recommendation ITU-T G.8080/Y.1304 (2006), Architecture for the automatically switched optical network (ASON), Amendment 1 (2008), Amendment 2 (2010). ITU-T G.8081 Recommendation ITU-T G.8081/Y.1353 (2010), Terms and definitions for Automatically Switched Optical Netwo
49、rks (ASON). ITU-T M.3010 Recommendation ITU-T M.3010 (2000), Principles for a telecommunications management network, Amendment 1 (2003), Amendment 2 (2005). ITU-T M.3013 Recommendation ITU-T M.3013 (2000), Considerations for a telecommunications management network. ITU-T M.3016.x Recommendation ITU-T M.3016.x-series (2005), TMN security overview. ITU-T Q.811 Recommendation ITU-T Q.811 (2004), Lower layer protocol profiles for the Q and X interfaces. ITU-T Q.812 Recommendation ITU-
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