ITU-T G 8080-2012 Architecture for the automatically switched optical network (Study Group 15)《自动交换光网络的体系结构 15号研究组》.pdf

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1、 International Telecommunication Union ITU-T G.8080/Y.1304TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2012) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Packet over Transport aspects Ethernet over Transport aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERN

2、ET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Architecture for the automatically switched optical network Recommendation ITU-T G.8080/Y.1304 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONN

3、ECTIONS 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 CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY

4、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.899 DIGITAL SECTIONS AND DIGITAL LINE SY

5、STEM 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 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 Ethernet over Transport aspects G.8000G.8099MPLS ove

6、r Transport aspects G.8100G.8199 Quality and availability targets G.8200G.8299 Service Management G.8600G.8699 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.8080/Y.1304 (02/2012) i Recommendation ITU-T G.8080/Y.1304 Architecture for

7、 the automatically switched optical network Summary Recommendation ITU-T G.8080/Y.1304 describes the reference architecture for the control plane of the automatically switched optical network as applicable to connection-oriented circuit or packet transport networks, as defined in Recommendation ITU-

8、T G.805. This reference architecture is described in terms of the key functional components and the interactions between them. History Edition Recommendation Approval Study Group 1.0 ITU-T G.8080/Y.1304 2001-11-29 15 1.1 ITU-T G.8080/Y.1304 (2001) Amd. 1 2003-03-16 15 1.2 ITU-T G.8080/Y.1304 (2001)

9、Amd. 2 2005-02-22 15 2.0 ITU-T G.8080/Y.1304 2006-06-06 15 2.1 ITU-T G.8080/Y.1304 (2006) Cor. 1 2007-09-06 15 2.2 ITU-T G.8080/Y.1304 (2006) Amd. 1 2008-03-29 15 2.3 ITU-T G.8080/Y.1304 (2006) Amd. 2 2010-09-06 15 3.0 ITU-T G.8080/Y.1304 2012-02-13 15 ii Rec. ITU-T G.8080/Y.1304 (02/2012) FOREWORD

10、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 responsible for studying tech

11、nical, 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 the ITU-T study groups which,

12、 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 collaborative basis with ISO and IE

13、C. 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 certain mandatory provisions (to en

14、sure, 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 requirements. The use of such words do

15、es 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. ITU takes no position concerni

16、ng 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 property, protected by patents,

17、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 2012 All rights reserved. No part of this publicatio

18、n may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.8080/Y.1304 (02/2012) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations and acronyms 3 5 Overview 5 5.1 Call and connection control 7 5.2 Interaction between con

19、trol, transport and management planes 8 6 Transport resources and their organization. 10 6.1 Transport entities 10 6.2 Routing areas 13 6.3 Topology and discovery . 17 6.4 Domains 18 6.5 Multi-layer aspects . 20 6.6 Interlayer client support 23 6.7 Calls supported by calls at same layer 25 6.8 Mappe

20、d server interlayer relationships 25 7 Control plane architecture. 26 7.1 Notation 27 7.2 Policy and federations 28 7.3 Architectural components . 31 7.4 Protocol controller (PC) components . 62 8 Reference points . 64 8.1 UNI . 65 8.2 I-NNI 66 8.3 E-NNI . 66 8.4 User architecture . 66 8.5 Inter-lay

21、er NCC interactions 67 9 Control plane use of signalling control networks (SCNs) 68 10 Identifiers 69 10.1 Name spaces . 69 10.2 Names and addresses 70 10.3 Relationships between identifiers . 71 11 Connection availability enhancement techniques . 71 11.1 Protection 72 11.2 Restoration 72 11.3 Neste

22、d routing domains 75 iv Rec. ITU-T G.8080/Y.1304 (02/2012) Page 12 Resilience 76 12.1 Principles of control and transport plane interactions 76 12.2 Principles of protocol controller communication . 77 12.3 Control and management plane interactions 77 Annex A Connection services . 78 Appendix I Resi

23、lience relationships . 81 I.1 Control plane DCN relationships 81 I.2 Control plane Transport plane relationships 82 I.3 Control plane Management plane relationships 83 I.4 Intra-control plane relationships . 84 Appendix II Example of layered call control 86 Appendix III Component interactions for co

24、nnection set-up 87 III.1 Hierarchical routing 87 III.2 Source and step-by-step routing . 89 III.3 Connection protection 94 III.4 Restoration Hard re-routing Intra-domain Hierarchical method . 95 III.5 Restoration Soft re-routing Intra-domain Source method . 99 III.6 Restoration Revertive re-routing

25、Intra-domain Source method 103 III.7 Source routing using a routing query interface 106 Appendix IV Combining protection and restoration domains 109 Appendix V Example of explicit multi-layer routing topology 114 Bibliography. 115 Rec. ITU-T G.8080/Y.1304 (02/2012) 1 Recommendation ITU-T G.8080/Y.13

26、04 Architecture for the automatically switched optical network 1 Scope This Recommendation specifies the architecture and requirements for the automatic switched transport network as applicable to connection-oriented circuit or packet transport networks, as defined in ITU-T G.805. This Recommendatio

27、n describes the set of control plane components that are used to manipulate transport network resources in order to provide the functionality of setting up, maintaining and releasing connections. The use of components allows for the separation of call control from connection control and the separati

28、on of routing and signalling. For the purposes of this Recommendation, components are used to represent abstract entities rather than instances of implementable software. UML-like notation is used to describe components of the architecture of the automatically switched optical network. 2 References

29、The following ITU-T Recommendations and other references contain provisions which, through reference 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 t

30、his Recommendation are therefore encouraged to investigate the possibility of applying the most recent 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

31、does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.705 Recommendation ITU-T G.705 (2000), Characteristics of plesiochronous digital hierarchy (PDH) equipment functional blocks. ITU-T G.800 Recommendation ITU-T G.800 (2012), Unified functional architecture of transpo

32、rt networks. ITU-T G.805 Recommendation ITU-T G.805 (2000), Generic functional architecture of transport networks. ITU-T G.7718 Recommendation ITU-T G.7718/Y.1709 (2005), Framework for ASON management. ITU-T G.8081 Recommendation ITU-T G.8081/Y.1353 (2010), Terms and definitions for automatically sw

33、itched optical networks. ITU-T M.3100 Recommendation ITU-T M.3100 (2005), Generic network information model. ITU-T X.25 Recommendation ITU-T X.25 (1996), Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connec

34、ted to public data networks by dedicated circuit. ITU-T Y.1311 Recommendation ITU-T Y.1311 (2002), Network-based VPNs Generic architecture and service requirements. ITU-T Y.1312 Recommendation ITU-T Y.1312 (2003), Layer 1 Virtual Private Network generic requirements and architecture elements. 2 Rec.

35、 ITU-T G.8080/Y.1304 (02/2012) ITU-T Y.1313 Recommendation ITU-T Y.1313 (2004), Layer 1 Virtual Private Network service and network architectures. 3 Definitions This Recommendation uses the following terms defined elsewhere: 3.1 access group (AG): ITU-T G.805. 3.2 adaptation: ITU-T G.805. 3.3 addres

36、s: ITU-T G.8081. 3.4 administrative domain: ITU-T G.805. 3.5 agent: ITU-T G.8081. 3.6 allocated (resource) label range: ITU-T G.8081. 3.7 assigned SNPs: ITU-T G.8081. 3.8 call: ITU-T G.8081. 3.9 call segment: ITU-T G.8081. 3.10 characteristic information: ITU-T G.800. 3.11 closed user group: ITU-T X

37、.25. 3.12 component: ITU-T G.8081. 3.13 configured (resource) label: ITU-T G.8081. 3.14 connection: ITU-T G.8081. 3.15 connection point (CP): ITU-T G.8081. 3.16 connection termination point (CTP): ITU-T G.8081. 3.17 control domain: ITU-T G.8081. 3.18 control plane: ITU-T G.8081. 3.19 control plane c

38、onfigured protection: ITU-T G.8081. 3.20 E-NNI: ITU-T G.8081, See also clause 8. 3.21 forwarding port (FPt): ITU-T G.800. 3.22 hard re-routing: ITU-T G.8081. 3.23 I-NNI: ITU-T G.8081, See also clause 8. 3.24 interface: ITU-T G.8081. 3.25 layer network: ITU-T G.805. 3.26 link: ITU-T G.805. 3.27 link

39、connection: ITU-T G.805. 3.28 management plane: ITU-T G.8081. 3.29 multi-homed: ITU-T G.8081. 3.30 name: ITU-T G.8081. 3.31 permanent connection: ITU-T G.8081. 3.32 policy: ITU-T G.8081. Rec. ITU-T G.8080/Y.1304 (02/2012) 3 3.33 port controller: ITU-T G.8081. 3.34 potential (resource) label range: I

40、TU-T G.8081. 3.35 potential SNPs: ITU-T G.8081. 3.36 re-routing domain: ITU-T G.8081. 3.37 restoration: ITU-T G.8081. 3.38 route: ITU-T G.8081. 3.39 routing area: ITU-T G.8081. 3.40 routing control domain: ITU-T G.8081. 3.41 routing level: ITU-T G.8081. 3.42 service level agreement: ITU-T G.8081. 3.

41、43 soft permanent connection (SPC): ITU-T G.8081. 3.44 soft rerouting: ITU-T G.8081. 3.45 subnetwork: ITU-T G.8081. 3.46 subnetwork connection (SNC): ITU-T G.8081. 3.47 subnetwork point (SNP): ITU-T G.8081. 3.48 subnetwork point pool (SNPP): ITU-T G.8081. 3.49 subnetwork point pool link (SNPP link):

42、 ITU-T G.8081. 3.50 supplementary services: ITU-T G.8081. 3.51 switched connection (SC): ITU-T G.8081. 3.52 termination connection point (TCP): ITU-T G.8081. 3.53 third party signalling: ITU-T G.8081. 3.54 trail: ITU-T G.805. 3.55 trail termination point (TTP): ITU-T G.8081. 3.56 transitional SNPP l

43、ink: ITU-T G.8081. 3.57 transport domain: ITU-T G.8081. 3.58 transport plane: ITU-T G.8081. 3.59 transport resource identifier: ITU-T G.8081. 3.60 user-network interface for the control plane (UNI): ITU-T G.8081, see also clause 8. 3.61 virtual private network: ITU-T Y.1311. 4 Abbreviations and acro

44、nyms This Recommendation uses the following abbreviations and acronyms: AG Access Group AGC Access Group Container CC Connection Controller CCC Calling party Call Controller CI Characteristic Information 4 Rec. ITU-T G.8080/Y.1304 (02/2012) CoS Class of Service CP Connection Point CPS Connection Poi

45、nt Status CTP Connection Termination Point DA Discovery Agent DCN Data Communication Network E-NNI External Network-Network Interface (reference point) FCAPS Fault, Configuration, Accounting, Performance, Security FwP Forwarding Point HOVC Higher Order Virtual Container id identifier I-NNI Internal

46、Network-Network Interface (reference point) LOVC Lower Order Virtual Container LRM Link Resource Manager MI Management Information MO Managed Object NCC Network Call Controller PC Protocol Controller PDP Policy Decision Point PEP Policy Enforcement Point RC Routing Controller SCN Signalling Control

47、Network SNC Subnetwork Connection SNP Subnetwork Point SNPP Subnetwork Point Pool SPC Soft Permanent Connection SC Switched Connection TAP Termination and Adaptation Performer TCP Termination Connection Point TTP Trail Termination Point UML Unified Modelling Language UNI User-Network Interface (refe

48、rence point) VPN Virtual Private Network Rec. ITU-T G.8080/Y.1304 (02/2012) 5 5 Overview The purpose of the automatic switched optical network (ASON) control plane is to: facilitate fast and efficient configuration of connections within a transport layer network to support both switched and soft per

49、manent connections; reconfigure or modify connections that support calls that have previously been set up; perform a restoration function. A well-designed control plane architecture should give service providers control of their network, while providing fast and reliable call set-up. The control plane itself should be reliable, scalabl