1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.7701 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1 (03/2018) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Data over Transport Generic aspects Transport network control aspects Commo
2、n control aspects Amendment 1 Recommendation ITU-T G.7701 (2016) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYS
3、TEMS 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 SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AN
4、D 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 SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.
5、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.7799 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Rec
6、ommendations. Rec. ITU-T G.7701 (2016)/Amd.1 (03/2018) i Recommendation ITU-T G.7701 Common control aspects Amendment 1 Summary Recommendation ITU-T G.7701 describes concepts that are common to both software defined networking (SDN) controller and automatically switched optical network (ASON) contro
7、l approaches, including common aspects of the interaction between the control functions, management functions and transport resources. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.7701 2016-11-13 15 11.1002/1000/13090 1.1 ITU-T G.7701 (2016) Amd. 1 2018-03-16 15 11.1002
8、/1000/13539 Keywords ASON, control components, management-control continuum, transport SDN. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en.
9、 ii Rec. ITU-T G.7701 (2016)/Amd.1 (03/2018) 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 permanen
10、t 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 Standardization Assembly (WTSA), which meets every four years, establishes
11、 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 technology which fall within ITU-Ts purview, the necessary standards
12、 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. Compliance with this Recommendation is voluntary. However, the Recommen
13、dation 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 obligatory language such as “must“ and the negative equivalents are
14、used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intell
15、ectual 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 of the date of approval of this Recommendation, ITU had not receive
16、d notice of intellectual 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/.
17、 ITU 2018 All 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.7701 (2016)/Amd.1 (03/2018) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms
18、 defined in this Recommendation . 2 4 Abbreviations and acronyms 5 5 Conventions 6 6 Overview . 6 7 Transport resources and their representation 7 7.1 Transport functional architecture . 7 7.2 Domains 8 7.3 Control view of transport resources for connection management 9 7.4 Virtualization 10 8 Contr
19、ol component approach 11 8.1 Notation 12 8.2 Policy 13 8.3 Common components . 15 9 Common control communications 40 10 Common management aspects of common control components . 40 10.1 Control component relationships 40 10.2 Control function management requirements 41 11 Identifiers 41 11.1 Resource
20、s in the transport network 41 11.2 Control view of transport resources . 42 11.3 Control components 43 11.4 Control artefacts . 43 11.5 Reference points . 43 11.6 Control communications network 44 Annex A Configuration of OTN digital and media layers 45 Bibliography. 48 Rec. ITU-T G.7701 (2016)/Amd.
21、1 (03/2018) 1 Recommendation ITU-T G.7701 Common control aspects Amendment 1 Editorial note: This is a complete-text publication. Modifications introduced by this amendment are shown in revision marks relative to Recommendation ITU-T G.7701 (2016). 1 Scope This Recommendation describes concepts that
22、 are common to both software defined networking (SDN) controller ITU-T G.7702 and automatically switched optical network (ASON) control ITU-T G.8080 approaches. This encompasses common aspects of: transport resources and their representation; control components used to describe architecture for appl
23、ication of SDN and ASON to the control of transport resources; control communication aspects; common management aspects of common control components; identifiers with respect to naming and addressing, which involves separation of identity from location. 2 References The following ITU-T Recommendatio
24、ns 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 this Recommendation are therefore
25、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 does not give it, as a stand-alon
26、e document, the status of a Recommendation. ITU-T G.698.1 Recommendation ITU-T G.698.1 (2009), Multichannel DWDM applications with single-channel optical interfaces. ITU-T G.698.2 Recommendation ITU-T G.698.2 (2009), Amplified multichannel dense wavelength division multiplexing applications with sin
27、gle channel optical interfaces. ITU-T G.800 Recommendation ITU-T G.800 (2016), Unified functional architecture of transport networks. ITU-T G.805 Recommendation ITU-T G.805 (2000), Generic functional architecture of transport networks. ITU-T G.872 Recommendation ITU-T G.872 (20122017), Architecture
28、of optical transport networks. ITU-T G.7702 Recommendation ITU-T G.7702 (2018), Architecture for SDN control of transport networks. ITU-T G.7711 Recommendation ITU-T G.7711/Y.1702 (2015), Generic protocol-neutral information model for transport resources. ITU-T G.7712 Recommendation ITU-T G.7712/Y.1
29、703 (2010), Architecture and specification of data communication network. 2 Rec. ITU-T G.7701 (2016)/Amd.1 (03/2018) ITU-T G.7714.1 Recommendation ITU-T G.7714.1/Y.1705.1 (2015), Protocol for automatic discovery in transport networks. ITU-T G.8080 Recommendation ITU-T G.8080/Y.1304 (2012), Architect
30、ure for the automatically switched optical network. ITU-T M.3100 Recommendation ITU-T M.3100 (2005), Generic network information model. ITU-T Q.2982 Recommendation ITU-T Q.2982 (1999), Broadband integrated services digital network (B-ISDN) Digital subscriber signalling system No. 2 (DSS2) Q.2931-bas
31、ed separated call control protocol. ITU-T X.731 Recommendation ITU-T X.731 (1992), Information technology Open Systems Interconnection Systems management: State. ITU-T Y.3300 Recommendation ITU-T Y.3300 (2014), Framework of software-defined networking. 3 Definitions 3.1 Terms defined elsewhere This
32、Recommendation uses the following terms defined elsewhere: 3.1.1 access point: ITU-T G.800. 3.1.2 adaptation: ITU-T G.800. 3.1.3 characteristic information (CI): ITU-T G.800. 3.1.4 connection: ITU-T G.800. 3.1.5 data communications network: ITU-T G.7712. 3.1.6 forwarding point (FP): ITU-T G.800. 3.1
33、.7 layer network: ITU-T G.805. 3.1.8 link: ITU-T G.805. 3.1.9 link connection: ITU-T G.805. 3.1.10 logical termination point: ITU-T G.7711. 3.1.11 software defined networking: b-ITU-T Y.3300. 3.1.12 subnetwork: ITU-T G.805. 3.1.13 subnetwork connection: ITU-T G.805. 3.1.14 trail: ITU-T G.805. 3.1.15
34、 transitional link: ITU-T G.800. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 address: A string of symbols that is valid regardless of the location of the source but changes if the destination moves. An address is used for the purpose of routing. So
35、urce and destination addresses must be globally unique. 3.2.2 administrative domain: A type of domain that belongs to a single entity such as a network operator, a service provider or an end-user. 3.2.3 boundary resource identifier (BRI): Used at a domain boundary to identify both the transport reso
36、urces, and the interface(s) between control components, at that boundary. Rec. ITU-T G.7701 (2016)/Amd.1 (03/2018) 3 3.2.4 call: An association between two or more users and one or more domains that support an instance of a service through one or more domains. Within domains, the association is supp
37、orted by network entities that contain call state. Between a user and a network call control entity and between network call control entities, there are call segments. The call consists of a set of concatenated call segments. 3.2.5 call admission control: A policy function invoked by an originating
38、role in a network and may involve cooperation with the terminating role in the network. 3.2.6 call controller: Calls are controlled by means of call controllers. There are two types of call controller components. 3.2.7 calling/called party call controller: The control component associated with an en
39、d of a call and may be co-located with end systems or located remotely and acts as a proxy on behalf of end systems. This controller acts in one or both of two roles, one to support the calling party and the other to support the called party. 3.2.8 call segment: An association between two call contr
40、ol entities (as per ITU-T Q.2982). Each call segment has zero or more associated connections. Call segments between network call control entities have zero or more supporting calls. 3.2.9 component: An abstract representation of a functional entity. In this Recommendation, components do not represen
41、t instances of implementation code. They are used to construct scenarios to explain the operation of the architecture. 3.2.10 component interface: Interfaces that represent the logical relationships between control components and are defined by the information flow between these entities. NOTE Such
42、a relationship allows for choice in selection of potentially exposable interfaces in support of different equipment implementations and network architectures. 3.2.11 connection admission control: A process that determines if there are sufficient resources to admit a connection (or re-negotiates reso
43、urces during a call). 3.2.12 connection controller (CC): The control component responsible for coordination among the link resource manager, the routing controller and both peer and subordinate connection controller components for the purpose of the management and supervision of connection setups, r
44、eleases and the modification of connection parameters for existing connections. 3.2.13 control domain: A type of domain that represents the scope of control over a collection of resources allocated to that domain as determined by a set of functions from the management-control continuum. 3.2.14 domai
45、n: Represents a collection of resources that are grouped for a particular purpose. Domains of the same type do not overlap among themselves, but a hierarchical containment relationship of domains is possible. NOTE In general, resources may be considered to encompass compute, networking, and storage.
46、 3.2.15 network call controller (NCC): A control component providing three roles, one for support of the calling party, another to support the called party and a third to support calls across domain boundaries. 3.2.16 policy: The set of rules selected from among alternatives and in the light of give
47、n conditions to guide and, usually, to determine present and future decisions. 3.2.17 recovery domain: A type of control domain whose purpose is assuring the reliable transfer of information across the resources allocated to that domain. NOTE Approaches to support reliable transfer of information ma
48、y include, e.g., protection, distributed or centralized restoration, etc. A pre-condition for establishing a recovery domain is that there are sufficient network resources in the domain to maintain a specified level of reliability for the selected approach(es). In 4 Rec. ITU-T G.7701 (2016)/Amd.1 (0
49、3/2018) multi-layer transport networks, a recovery domain in a client layer network must fully contain any recovery domains in the server layer networks that it uses. 3.2.18 resource database (RDB): A logical entity that holds (makes available) information that components use for their operations. Related components share the same RDB. 3.2.19 route: A sequence of the artefacts representing the transport resources (i.e., SNPs, SNPPs, and routing areas)
