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 (11/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Data over Transport Generic aspects Transport network control aspects Common control as
2、pects Recommendation ITU-T G.7701 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 SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS
3、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 AND LINE TELEPHONY G.450G.499 TRANSMISSION ME
4、DIA 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.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6
5、000G.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 Recommendations. Rec. ITU-T G.7701 (11/2016) i
6、 Recommendation ITU-T G.7701 Common control aspects Summary Recommendation ITU-T G.7701 describes concepts that are common to both software defined networking (SDN) controller and automatically switched optical network (ASON) control approaches, including common aspects of the interaction between th
7、e 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 Keywords ASON, control components, management-control continuum, transport SDN. * To access the Recommendation, type the
8、 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. ii Rec. ITU-T G.7701 (11/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in
9、 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 technical, operating and tariff questions and issuing Recommendations on them with a view to st
10、andardizing 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
11、 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 IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to
12、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 ensure, e.g., interoperability or applicability) and compliance with the Recommendation is ac
13、hieved 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 does not suggest that compliance with the Recommendation is required of any party. INTELLECTU
14、AL PROPERTY RIGHTSITU 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
15、asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautio
16、ned 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 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of IT
17、U. Rec. ITU-T G.7701 (11/2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 4 5 Conventions 6 6 Overview . 6 7 Transport resources and their representation 7 7.1 Transpo
18、rt functional architecture . 7 7.2 Domains 8 7.3 Control view of transport resources for connection management 8 7.4 Virtualization 10 8 Control component approach 11 8.1 Notation 11 8.2 Policy 13 8.3 Common components . 15 9 Common control communications 35 10 Common management aspects of common co
19、ntrol components . 36 10.1 Control component relationships 36 10.2 Control function management requirements 37 11 Identifiers 37 11.1 Resources in the transport network 37 11.2 Control view of transport resources . 37 11.3 Control components 38 11.4 Control artefacts . 38 11.5 Reference points . 38
20、11.6 Control communications network 38 Annex A Configuration of OTN digital and media layers 39 Bibliography. 42 Rec. ITU-T G.7701 (11/2016) 1 Recommendation ITU-T G.7701 Common control aspects 1 Scope This Recommendation describes concepts that are common to both software defined networking (SDN) c
21、ontroller and automatically switched optical network (ASON) control approaches. This encompasses common aspects of: transport resources and their representation; control components used to describe architecture for application of SDN and ASON to the control of transport resources; control communicat
22、ion 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 Recommendations and other references contain provisions which, through reference in this text,
23、 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 recent edition of
24、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.698.1 Recommendation ITU-T G.
25、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 single channel optical interfaces. ITU-T G.800 Recommendation ITU-T G.800 (2016), Un
26、ified 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 (2012), Architecture of optical transport networks. ITU-T G.7711 Recommendation ITU-T G.7711/Y.1702 (2015)
27、, Generic protocol-neutral information model for transport resources. ITU-T G.7712 Recommendation ITU-T G.7712/Y.1703 (2010), Architecture and specification of data communication network. ITU-T G.7714.1 Recommendation ITU-T G.7714.1/Y.1705.1 (2015), Protocol for automatic discovery in transport netw
28、orks. ITU-T G.8080 Recommendation ITU-T G.8080/Y.1304 (2012), Architecture for the automatically switched optical network. ITU-T M.3100 Recommendation ITU-T M.3100 (2005), Generic network information model. 2 Rec. ITU-T G.7701 (11/2016) ITU-T Q.2982 Recommendation ITU-T Q.2982 (1999), Broadband inte
29、grated services digital network (B-ISDN) Digital subscriber signalling system No. 2 (DSS2) Q.2931-based separated call control protocol. ITU-T X.731 Recommendation ITU-T X.731 (1992), Information technology Open Systems Interconnection Systems management: State. 3 Definitions 3.1 Terms defined elsew
30、here This 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
31、G.800. 3.1.7 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.8
32、05. 3.1.15 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 r
33、outing. Source 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 tran
34、sport resources, and the interface(s) between control components, at that boundary. 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 supported by network entities that co
35、ntain 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 role in a network and may involve
36、 cooperation with the terminating role in the network. Rec. ITU-T G.7701 (11/2016) 3 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 end o
37、f 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 control
38、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 represent i
39、nstances 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 a r
40、elationship 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 resourc
41、es 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, rele
42、ases 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 domain:
43、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. 3.
44、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 given c
45、onditions 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 may i
46、nclude, 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 multi-layer transport networks, a reco
47、very 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 r
48、oute: A sequence of the artefacts representing the transport resources (i.e., SNPs, SNPPs, and routing areas) that support, or are intended to support, a connection. 4 Rec. ITU-T G.7701 (11/2016) 3.2.20 routing area (RA): An instance of a routing domain, and is defined by a set of subnetworks, the S
49、NPP links that interconnect them, and the SNPPs representing the ends of the SNPP links exiting that routing area. A routing area may contain smaller routing areas interconnected by SNPP links. The limit of subdivision results in a routing area that contains a subnetwork. 3.2.21 routing controller (RC): A control component with the roles to: respond to requests for path (route) information needed to set up connections. This information can range from end-to-en
