1、 International Telecommunication Union ITU-T G.8080/Y.1304TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2006) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Ethernet over Transport aspects General aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL AS
2、PECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Architecture for the automatically switched optical network (ASON) ITU-T Recommendation G.8080/Y.1304 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS
3、 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 OR SATE
4、LLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF
5、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 ETHERNET OVER TRANSPORT ASPECTS G.8000G.8999 General aspects G.8000G.8099 MPLS over Transport aspects G.8100G.8199 Quality and availa
6、bility targets G.8200G.8299 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.8080/Y.1304 (06/2006) i ITU-T Recommendation G.8080/Y.1304 Architecture for the automatically switched optical network (ASON) Summary This Recommendation desc
7、ribes the reference architecture for the control plane of the Automatically Switched Optical Network as applicable to SDH transport networks, as defined in ITU-T Rec. G.803 and Optical Transport Networks, as defined in ITU-T Rec. G.872. This reference architecture is described in terms of the key fu
8、nctional components and the interactions between them. Source ITU-T Recommendation G.8080/Y.1304 was approved on 6 June 2006 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.8080/Y.1304 (06/2006) FOREWORD The International Telecommunication Union (ITU
9、) is the United Nations specialized agency in the field of telecommunications. The 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 standard
10、izing 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, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is cover
11、ed 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 IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indica
12、te both a telecommunication administration and a recognized operating agency. Compliance 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 w
13、hen 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 does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPE
14、RTY 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 concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserte
15、d 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, which may be required to implement this Recommendation. However, implementors are cautioned that th
16、is may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2006 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.8080/Y.1304 (06/2006) iii C
17、ONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations 4 5 Overview 4 5.1 Call and connection control 6 5.2 Interaction between control, 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
18、discovery . 17 6.4 Domains 18 6.5 Multi-layer aspects . 20 6.6 Interlayer client support 22 6.7 Calls supported by calls at same layer 23 7 Control plane architecture. 24 7.1 Notation 24 7.2 Policy and federations 25 7.3 Architectural components. 28 7.4 Protocol controller (PC) components . 47 8 Ref
19、erence points . 48 8.1 UNI. 49 8.2 I-NNI 50 8.3 E-NNI . 50 8.4 User Architecture 50 8.5 Inter-layer NCC interactions 51 9 Network management of control plane entities 52 10 Identifiers 53 10.1 Name spaces . 53 10.2 Names and addresses 54 10.3 Relationships between identifiers. 55 11 Connection avail
20、ability enhancement techniques. 55 11.1 Protection 56 11.2 Restoration 56 iv ITU-T Rec. G.8080/Y.1304 (06/2006) Page 12 Resilience 60 12.1 Principles of control and transport plane interactions 60 12.2 Principles of protocol controller communication. 61 12.3 Control and management plane interactions
21、 61 Annex A Connection services. 61 Appendix I ASON layer networks 64 Appendix II Illustrative examples of implementations. 65 Appendix III Resilience relationships. 67 III.1 Control plane DCN relationships 67 III.2 Control plane Transport plane relationships 68 III.3 Control plane Management plane
22、relationships 69 III.4 Intra-control plane relationships. 70 Appendix IV Example of layered call control 72 Appendix V Component interactions for connection set-up. 73 V.1 Hierarchical routing 73 V.2 Source and step-by-step routing . 75 V.3 Connection protection 80 V.4 Restoration Hard Re-routing In
23、tra-domain Hierarchical method 81 V.5 Restoration Soft Re-routing Intra-domain Source method 85 V.6 Restoration Revertive Re-routing Intra-domain Source method. 89 V.7 Source Routing using Routing Query interface 92 BIBLIOGRAPHY 95 ITU-T Rec. G.8080/Y.1304 (06/2006) 1 ITU-T Recommendation G.8080/Y.1
24、304 Architecture for the automatically switched optical network (ASON) 1 Scope This Recommendation specifies the architecture and requirements for the automatic switched transport network as applicable to SDH transport networks, as defined in ITU-T Rec. G.803, and Optical Transport Networks, as defi
25、ned in ITU-T Rec. G.872. This Recommendation 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 contr
26、ol from connection control and the separation 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 Automatica
27、lly Switched Optical Network. 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 time of publication, the editions indicated were valid. All Recommendations and other ref
28、erences 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. A list of the currently valid ITU-T Recommendations is regularly published. The referenc
29、e to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Recommendation G.705 (2000), Characteristics of plesiochronous digital hierarchy (PDH) equipment functional blocks. ITU-T Recommendation G.707/Y.1322 (2003), Network node int
30、erface for the synchronous digital hierarchy (SDH). ITU-T Recommendation G.709/Y.1331 (2003), Interfaces for the optical transport network (OTN). ITU-T Recommendation G.783 (2006), Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks. ITU-T Recommendation G.798 (2004),
31、Characteristics of optical transport network hierarchy equipment functional blocks. 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 architecture of transport networks. ITU-T
32、Recommendation G.872 (2001), Architecture of optical transport networks. ITU-T Recommendation G.8081/Y.1353 (2004), Terms and definitions for Automatically Switched Optical Networks (ASON). ITU-T Recommendation M.3000 (2000), Overview of TMN Recommendations. ITU-T Recommendation M.3010 (2000), Princ
33、iples for a telecommunications management network. 2 ITU-T Rec. G.8080/Y.1304 (06/2006) ITU-T Recommendation M.3100 (2005), Generic network information model. ITU-T Recommendation X.25 (1996), Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals
34、operating in the packet mode and connected to public data networks by dedicated circuit. ITU-T Recommendation Y.1311 (2002), Network-based VPNs Generic architecture and service requirements. ITU-T Recommendation Y.1312 (2003), Layer 1 Virtual Private Network generic requirements and architecture ele
35、ments. ITU-T Recommendation Y.1313 (2004), Layer 1 Virtual Private Network service and network architectures. 3 Definitions This Recommendation uses the following terms defined in other ITU-T Recommendations. 3.1 access group (AG): See ITU-T Rec. G.805. 3.2 adaptation: See ITU-T Rec. G.805. 3.3 admi
36、nistrative domain: See ITU-T Rec. G.805. 3.4 trail: See ITU-T Rec. G.805. 3.5 closed user group: See ITU-T Rec. X.25. 3.6 link: See ITU-T Rec. G.805. 3.7 link connection: See ITU-T Rec. G.805. 3.8 virtual private network: See ITU-T Rec. Y.1311. 3.9 layer network: See ITU-T Rec. G.805. 3.10 agent: Se
37、e ITU-T Rec. G.8081/Y.1353. 3.11 call: See ITU-T Rec. G.8081/Y.1353. 3.12 call segment: See ITU-T Rec. G.8081/Y.1353. 3.13 component: See ITU-T Rec. G.8081/Y.1353. 3.14 connection point (CP): See ITU-T Rec. G.8081/Y.1353. 3.15 connection termination point (CTP): See ITU-T Rec. G.8081/Y.1353. 3.16 co
38、ntrol plane: See ITU-T Rec. G.8081/Y.1353. 3.17 management plane: See ITU-T Rec. G.8081/Y.1353. 3.18 multi-homed: See ITU-T Rec. G.8081/Y.1353. 3.19 policy: See ITU-T Rec. G.8081/Y.1353. 3.20 port controller: See ITU-T Rec. G.8081/Y.1353. 3.21 route: See ITU-T Rec. G.8081/Y.1353. 3.22 routing area:
39、See ITU-T Rec. G.8081/Y.1353. 3.23 routing level: See ITU-T Rec. G.8081/Y.1353. 3.24 subnetwork: See ITU-T Rec. G.8081/Y.1353. 3.25 subnetwork connection (SNC): See ITU-T Rec. G.8081/Y.1353. ITU-T Rec. G.8080/Y.1304 (06/2006) 3 3.26 subnetwork point (SNP): See ITU-T Rec. G.8081/Y.1353. 3.27 subnetwo
40、rk point pool (SNPP): See ITU-T Rec. G.8081/Y.1353. 3.28 subnetwork point pool link (SNPP link): See ITU-T Rec. G.8081/Y.1353. 3.29 termination connection point (TCP): See ITU-T Rec. G.8081/Y.1353. 3.30 trail termination point (TTP): See ITU-T Rec. G.8081/Y.1353. 3.31 transport plane: See ITU-T Rec.
41、 G.8081/Y.1353. 3.32 control domain: See ITU-T Rec. G.8081/Y.1353. 3.33 transport domain: See ITU-T Rec. G.8081/Y.1353. 3.34 hard re-routing: See ITU-T Rec. G.8081/Y.1353. 3.35 control plane configured protection: See ITU-T Rec. G.8081/Y.1353. 3.36 re-routing domain: See ITU-T Rec. G.8081/Y.1353. 3.
42、37 restoration: See ITU-T Rec. G.8081/Y.1353. 3.38 routing control domain: See ITU-T Rec. G.8081/Y.1353. 3.39 transport resource identifier: See ITU-T Rec. G.8081/Y.1353. 3.40 address: See ITU-T Rec. G.8081/Y.1353. 3.41 E-NNI: See ITU-T Rec. G.8081/Y.1353. See also clause 8. 3.42 interface: See ITU-
43、T Rec. G.8081/Y.1353. 3.43 I-NNI: See ITU-T Rec. G.8081/Y.1353. See also clause 8. 3.44 name: See ITU-T Rec. G.8081/Y.1353. 3.45 permanent connection: See ITU-T Rec. G.8081/Y.1353. 3.46 switched connection (SC): See ITU-T Rec. G.8081/Y.1353. 3.47 soft permanent connection (SPC): See ITU-T Rec. G.808
44、1/Y.1353. 3.48 service level agreement: See ITU-T Rec. G.8081/Y.1353. 3.49 supplementary services: See ITU-T Rec. G.8081/Y.1353. 3.50 third party signalling: See ITU-T Rec. G.8081/Y.1353. 3.51 user-network interface for the control plane (UNI): See ITU-T Rec. G.8081/Y.1353. (See also clause 8.) This
45、 Recommendation defines the following terms: 3.52 connection: A connection is a concatenation of link connections and subnetwork connections (as described in ITU-T Rec. G.805) that allows the transport of user information between the ingress and egress points of a subnetwork. 3.53 soft re-routing: S
46、oft re-routing is a function that reroutes a connection for administrative purposes. The original connection is not taken out of service until the rerouted connection is established. 4 ITU-T Rec. G.8080/Y.1304 (06/2006) 4 Abbreviations This Recommendation uses the following abbreviations: AG Access
47、Group AGC Access Group Container CC Connection Controller CCC Calling party Call Controller CP Connection Point CPS Connection Point Status CTP Connection Termination Point DA Discovery Agent DCN Data Communications Network E-NNI External Network-Network Interface (reference point) HOVC Higher Order
48、 Virtual Container id identifier I-NNI Internal 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 RC Routing Controller SNC Subnetwork Connection SNP
49、Subnetwork Point SNPP Subnetwork Point Pool TAP Termination and Adaptation Performer TCP Termination Connection Point TTP Trail Termination Point UML Unified Modelling Language UNI User-Network Interface (reference point) VPN Virtual Private Network 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 permanent connections. Reconf
