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 Series Y TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 26 (12/2015) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS ITU-T Y.2600-series Scenario and requireme
2、nts of reconfigurable networking based on minimum network functions and network polymorphism in future packet based networks ITU-T Y-series Recommendations Supplement 26 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL IN
3、FORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middleware Y.200Y.299 Network aspects Y.300Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.800Y.899 INT
4、ERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.1199 Architecture, access, network capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1699 Operatio
5、n, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 IPTV over NGN Y.1900Y.1999 NEXT GENERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilities and service architecture Y.2200Y.2
6、249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Enhancements to NGN Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Packet-based Networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 Carr
7、ier grade open environment Y.2900Y.2999 FUTURE NETWORKS Y.3000Y.3499 CLOUD COMPUTING Y.3500Y.3999 INTERNET OF THINGS AND SMART CITIES AND COMMUNITIES General Y.4000Y.4049 Definitions and terminologies Y.4050Y.4099 Requirements and use cases Y.4100Y.4249 Infrastructure, connectivity and networks Y.42
8、50Y.4399 Frameworks, architectures and protocols Y.4400Y.4549 Services, applications, computation and data processing Y.4550Y.4699 Management, control and performance Y.4700Y.4799 Identification and security Y.4800Y.4899 For further details, please refer to the list of ITU-T Recommendations. Y serie
9、s Supplement 26 (12/2015) i Supplement 26 to ITU-T Y-series Recommendations ITU-T Y.2600-series Scenario and requirements of reconfigurable networking based on minimum network functions and network polymorphism in future packet based networks Summary Supplement 26 to the ITU-T Y.2600-series Recommen
10、dations aims to provide reconfigurable networking scenarios, to focus on the mechanisms for minimum network functions and network polymorphism and to define the basic requirements of reconfigurable networking based on minimum network functions and network polymorphism in future packet based networks
11、 (FPBN) as described in Recommendation ITU-T Y.2601. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T Y Suppl. 26 2015-12-11 13 11.1002/1000/12697 Keywords Future packet based networks (FPBN), minimum network functions, network polymorphism, reconfigurable networking. * To ac
12、cess 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. ii Y series Supplement 26 (12/2015) FOREWORD The International Telecommunication Union (ITU) is th
13、e 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 technical, operating and tariff questions and issuing Rec
14、ommendations 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, in turn, produce Recommendations on these topics. Th
15、e 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 IEC. NOTE In this publication, the expression “Administ
16、ration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this publication is voluntary. However, the publication may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance
17、with the publication 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 does not suggest that compliance with the publication is required o
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20、 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 2016 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permi
21、ssion of ITU. Y series Supplement 26 (12/2015) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Supplement 1 4 Abbreviations and acronyms 2 5 Conventions 2 6 Introduction . 3 7 Reconfigurable networking mechanisms 3 8 Rec
22、onfigurable networking scenarios . 4 8.1 Internet service providers can build customized data networks with high efficiency and minimum functions . 4 8.2 Future Internet researchers can build a future Internet testbed with routers so that functions can be conveniently expanded 5 8.3 Flexible network
23、 architecture supported by reconfigurable networking can improve network security and robustness 5 8.4 Traditional network operators can adopt reconfigurable networking to build smart pipe or network intelligence capability enhancement (NICE) 5 8.5 Flexible network architecture supported by reconfig
24、urable networking can facilitate the business mode of network virtual operation . 5 9 Function requirements 6 9.1 Routing mechanisms requirements . 6 9.2 Network functions requirements 6 9.3 Service provision requirements 6 9.4 Context awareness requirements 7 9.5 Resource virtualization requirement
25、s . 7 9.6 Network manageability requirements . 7 9.7 Open operation interfaces and protocols requirements 7 10 Security considerations . 7 Appendix I A candidate solution of reconfigurable networking based on minimum network functions and network polymorphism 8 I.1 Network function reference model .
26、 8 I.2 Functions and concepts . 9 Y series Supplement 26 (12/2015) 1 Supplement 26 to ITU-T Y-series Recommendations ITU-T Y.2600-series Scenario and requirements of reconfigurable networking based on minimum network functions and network polymorphism in future packet based networks 1 Scope This Sup
27、plement provides scenarios and the basic requirements of reconfigurable networking based on mechanisms for minimum network functions and network polymorphism and demonstrates a possible candidate solution to meet these requirements. 2 References ITU-T Y.2011 Recommendation ITU-T Y.2011 (2004), Gener
28、al principles and general reference model for Next Generation Networks. ITU-T Y.2601 Recommendation ITU-T Y.2601 (2006), Fundamental characteristics and requirements of future packet based networks. ITU-T Y.2611 Recommendation ITU-T Y.2611 (2006), High-level architecture of future packet-based netwo
29、rks. 3 Definitions 3.1 Terms defined elsewhere This Supplement uses the following terms defined elsewhere: 3.1.1 control plane ITU-T Y.2011: The set of functions that controls the operation of entities in the stratum or layer under consideration, plus the functions required to support this control.
30、3.1.2 data plane ITU-T Y.2011: The set of functions used to transfer data in the stratum or layer under consideration. 3.1.3 management plane ITU-T Y.2011: The set of functions used to manage entities in the stratum or layer under consideration, plus the functions required to support this management
31、. 3.2 Terms defined in this Supplement This Supplement defines the following terms: 3.2.1 future packet based network (FPBN): A network architecture providing the topmost layer(s) of the transport stratum as defined in ITU-T Y.2011. NOTE 1 This definition is based on the description of FPBN in ITU-T
32、 Y.2601. NOTE 2 Fundamental characteristics and requirements of future packet based networks are defined in ITU-T Y.2601. 3.2.2 independent scalable control plane (iSCP): An architectural approach to future packet based networks (FPBNs) which consists in separating the control plane from the data pl
33、ane. NOTE Fundamental characteristics and requirements of future packet based networks are defined in ITU-T Y.2601. 3.2.3 minimum network functions: A set of network functions which can support the most basic and important network functions including network addressing, routing and forwarding. Netwo
34、rk addressing, routing and forwarding cannot be achieved without any one minimum network function in the set of network functions. 2 Y series Supplement 26 (12/2015) 3.2.4 network polymorphism: A network can show different network morphologies, such as different network addressing and routing mechan
35、isms or different packet transmission modes. 3.2.5 reconfigurable networking: A networking mechanism which can flexibly support changes to the network structure, network protocols and the network functions of network elements, to meet frequently changing application requirements. 4 Abbreviations and
36、 acronyms This Supplement uses the following abbreviations and acronyms: ANC Atomic Network Capability AS Atomic Service BGP Border Gateway Protocol CC Combination Chain CID Content Identifier FPBN Future Packet Based Network HID Host Identifier IDC Internet Data Centre IP Internet Protocol LID Loca
37、tion Identifier NGN Next Generation Network NICE Network Intelligence Capability Enhancement ONF Open Network Forum OSI Open Systems Interconnection OSPF Open Shortest Path First RIP Routing Information Protocol RPN Reconfigurable Polymorphic Network SDN Software Defined Networking SID Service Ident
38、ifier SP Service Path TCP Transmission Control Protocol UDP User Datagram Protocol 5 Conventions In this Supplement: The keywords “is required to“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this document is to be claimed. The key
39、words “is recommended“ indicate a requirement which is recommended but which is not absolutely required. Thus this requirement need not be present to claim conformance. The keywords “can optionally“ and “may“ indicate an optional requirement which is permissible, without implying any sense of being
40、recommended. These terms are not intended to imply that the Y series Supplement 26 (12/2015) 3 vendors implementation must provide the option and the feature can be optionally enabled by the network operator/service provider. Rather, it means the vendor may optionally provide the feature and still c
41、laim conformance with this document. 6 Introduction With the rapid development of Internet services and next generation network (NGN) services, application layer requests need a more flexible and efficient transport stratum as defined in ITU-T Y.2011. In addition, network requirements will be increa
42、singly polymorphic and subject to frequent changes in the future, so it is very difficult to accurately predict the requirements of future networks and it is even more difficult to design new candidates for future packet based networks (FPBNs) based on these currently predicted requirements. Today,
43、as a consequence, academic and industrial communities have begun to study future network architecture solutions which can “flexibly change the network structure to adopt the frequently changing application requirements“. This means that the future network must be polymorphic and so able to easily ch
44、ange the network structure, network protocols and network functions of network elements, to meet frequently changing application requirements. This task is ongoing and promising progress has been made. Reconfigurable networking is becoming one of the basic characteristics of future packet based netw
45、orks (FPBNs). Figure 1 shows the change from transport control protocol/Internet protocol (TCP/IP) to reconfigurable networking. Figure 1 From TCP/IP to reconfigurable networking 7 Reconfigurable networking mechanisms There are many different approaches and methods that can be employed to realize re
46、configurable networking. One method under research is to abstract the network functions and encapsulate them as network middlewares. These network middlewares can be used to assemble a specific network which can meet all of the needs of that specific network. Another method makes full use of the “mi
47、cro kernel“ concept of a computer operating system and designs a “micro kernel“ of network functions. This micro kernel can support the most basic network functions and includes the minimum network instruction set. Other network functions are in the form of plug-ins and are spliced to the network mi
48、cro kernel in a plug-and-play manner to compose a relatively simple and efficient network layer. Figure 2 shows a simplified reference functional framework of this mechanism. 4 Y series Supplement 26 (12/2015) Figure 2 Reference functional framework of minimum network functions and network polymorph
49、ism This framework adopts the concept of a “mico kernel“ and network polymorphism which abstracts the most basic and most important network functions as stable minimum network functions. Other network functions can be derived based on the minimum network functions. The process of creating new network functions based on these most basic network functions is called network polymorphism. 8 Reconfigurable networking scenarios 8.1 Internet service providers can build customized da
