1、 International Telecommunication Union ITU-T Y.2113TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2009) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Next Generation Networks Quality of Service and performance Ethernet QoS control for next g
2、eneration networks Recommendation ITU-T Y.2113 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middleware Y.200Y.299 Network aspects Y.300Y.399 Int
3、erfaces 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 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.1199 Architecture, access, network capabiliti
4、es 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 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 NEXT GENERATION NETWORKS Frameworks and functional arc
5、hitecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilities and service architecture Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Numbering, naming and addressing Y.2300Y.2399 Network management Y.
6、2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Y.2113 (01/2009) i Recommendation ITU-T Y.2113 Ethernet QoS control for next generation netwo
7、rks Summary Recommendation ITU-T Y.2113 specifies dynamic Ethernet quality of service (QoS) control for next generation networks. Specifically, it defines service definitions and general requirements, a QoS control architecture, and a set of traffic management mechanisms for Ethernet-based NGNs. Rel
8、ated OAM and protection and restoration mechanisms are specified by reference to other Recommendations. Source Recommendation ITU-T Y.2113 was approved on 23 January 2009 by ITU-T Study Group 13 (2009-2012) under Recommendation ITU-T A.8 procedures. ii Rec. ITU-T Y.2113 (01/2009) FOREWORD The Intern
9、ational 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 technical, ope
10、rating 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, in turn,
11、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 IEC. NOTE In
12、 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 ensure e.g.,
13、 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 does not sugg
14、est 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 concerning the evid
15、ence, 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 received notice of intellectual property, protected by patents, which m
16、ay 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 2009 All rights reserved. No part of this publication may b
17、e reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Y.2113 (01/2009) iii 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 2 5 Conventions 5 6 Conce
18、pt and general requirements for the Ethernet-based NGN . 5 6.1 Definition of Ethernet-based NGN concept . 5 6.2 General requirements for Ethernet-based NGN service. 5 7 QoS architecture for the Ethernet-based NGN . 6 7.1 Introduction 6 7.2 Reference model. 6 7.3 VPN configuration 9 7.4 High layer sw
19、itching. 14 7.5 Access control 15 8 Traffic management for Ethernet-based NGN . 15 8.1 Overview 15 8.2 Ethernet QoS services. 15 8.3 Ethernet traffic management functions 16 8.4 Traffic management mechanism for edge side. 17 8.5 Traffic management mechanisms for core side 19 8.6 Connection admission
20、 control (CAC) 20 8.7 Resource reservation procedure . 21 8.8 Ethernet traffic grooming . 21 9 Operation, administration and maintenance for the Ethernet-based NGN. 21 10 Ethernet protection and restoration for the Ethernet-based NGN 22 11 Security consideration 22 Appendix I Example of access contr
21、ol mechanism 23 Appendix II Example scenarios of resource reservation procedure . 25 Bibliography. 27 Rec. ITU-T Y.2113 (01/2009) 1 Recommendation ITU-T Y.2113 Ethernet QoS control for next generation networks 1 Scope This Recommendation addresses Ethernet quality of service (QoS) control for next g
22、eneration networks. It specifies the following: Service definitions and general requirements for Ethernet-based NGNs. Reference model of QoS architecture for Ethernet-based NGNs. Traffic management mechanisms for Ethernet-based NGNs. Operation, administration and maintenance (OAM) mechanisms for Eth
23、ernet-based NGNs. Protection and restoration mechanisms for Ethernet-based NGNs. The OAM and protection and restoration mechanisms are specified by reference to other Recommendations. Ethernet-based NGN is broadly characterized as the employment of IP protocols for the control of Ethernet data flows
24、. In the data link layer, data link features and interfaces defined in b-IEEE 802.3 will not be altered. As considered in this Recommendation, the Ethernet network encompasses not only the customers local network but also the operators access and core networks, which are assumed to employ Ethernet t
25、echnology. 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 references are subject
26、 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 reference to a document wit
27、hin this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.7041 Recommendation ITU-T G.7041/Y.1303 (2005), Generic framing procedure (GFP). ITU-T G.8001 Recommendation ITU-T G.8001/Y.1354 (2008), Terms and definitions for Ethernet frames over transpo
28、rt. ITU-T G.8010 Recommendation ITU-T G.8010/Y.1306 (2004), Architecture of Ethernet layer networks. ITU-T G.8011 Recommendation ITU-T G.8011/Y.1307 (2004), Ethernet over Transport Ethernet services framework. ITU-T G.8012 Recommendation ITU-T G.8012/Y.1308 (2004), Ethernet UNI and Ethernet NNI. ITU
29、-T G.8021 Recommendation ITU-T G.8021/Y.1341 (2007), Characteristics of Ethernet transport network equipment functional blocks. ITU-T G.8031 Recommendation ITU-T G.8031/Y.1342 (2006), Ethernet linear protection switching. 2 Rec. ITU-T Y.2113 (01/2009) ITU-T G.8032 Recommendation ITU-T G.8032/Y.1344
30、(2008), Ethernet ring protection switching. ITU-T Y.1221 Recommendation ITU-T Y.1221 (2002), Traffic control and congestion control in IP-based networks. ITU-T Y.1541 Recommendation ITU-T Y.1541 (2006), Network performance objectives for IP-based services. ITU-T Y.1730 Recommendation ITU-T Y.1730 (2
31、004), Requirements for OAM functions in Ethernet-based networks and Ethernet services. ITU-T Y.1731 Recommendation ITU-T Y.1731 (2006), OAM functions and mechanisms for Ethernet based networks. ITU-T Y.2012 Recommendation ITU-T Y.2012 (2006), Functional requirements and architecture of the NGN relea
32、se 1. ITU-T Y.2111 Recommendation ITU-T Y.2111 (2006), Resource and admission control functions in Next Generation Networks. IEEE 802.1Q IEEE Standard 802.1Q (2005), IEEE standard for local and metropolitan area networks Virtual Bridged Local Area Networks. 3 Definitions 3.1 Terms defined elsewhere
33、None. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 Ethernet user to network interface (E-UNI): An interface that uses the Ethernet frame structure between a user (an end user or a customer network) and a network element of the transport network. 3.2
34、.2 Ethernet network to network interface (E-NNI): An interface that uses the Ethernet frame structure between network elements within separate transport networks. 3.2.3 Ethernet virtual connection (EVC): An instance of an association of two or more E-UNIs. These E-UNIs are said to be “in the EVC“. A
35、 given UNI can support more than one EVC via the service multiplexing attribute. NOTE This terminology is used in a different way as defined in ITU-T G.8011 and ITU-T G.8001. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations: AAA Authentication, Authorization, Account
36、ing AR Access Rate ARP Address Resolution Protocol ATM Asynchronous Transfer Mode B-Tag Backbone VLAN Tag BW Bandwidth Rec. ITU-T Y.2113 (01/2009) 3 CAC Connection Admission Control CBR Constant Bit Rate CBS Committed Burst Size CE Customer Edge CF Coupling Flag CIR Committed Information Rate CL-PS
37、Connectionless, Packet-Switched CM Colour Mode CMTS Cable Modem Termination System CO-CS Connection Oriented, Circuit-Switched CO-PS Connection Oriented, Packet-Switched CoS Class of Service CPE Customer Premises Equipment C-Tag Customer VLAN Tag C-VID Customer VLAN ID DSL Digital Subscriber Line DS
38、LAM Digital Subscriber Line Access Multiplexer E-AF Ethernet Assured Forwarding E-DF Ethernet Default Forwarding E-EF Ethernet Expedited Forwarding E-LAN Ethernet LAN E-LINE Ethernet Line E-NNI Ethernet Network to Network Interface E-PHB Ethernet Per-Hop Behaviour E-Tree Ethernet Tree E-UNI Ethernet
39、 User to Network Interface EAP Extensible Authentication Protocol EAPoL EAP over LAN EBS Excess Burst Size EIR Excess Information Rate EPL Ethernet Private Line EPLAN Ethernet Private LAN EVC Ethernet Virtual Connection EVPL Ethernet Virtual Private Line EVPLAN Ethernet Virtual Private LAN FRS Frame
40、 Relay Service GFP Generic Framing Procedure 4 Rec. ITU-T Y.2113 (01/2009) GGSN Gateway GPRS Support Node GMPLS Generalized MultiProtocol Label Switching GPRS General Packet Radio Service I-Tag Backbone Service Instance Tag ID Identifier IP Internet Protocol LDP Label Distribution Protocol LSP Label
41、 Switched Path MAC Media Access Control MBS Maximum Burst Size MPLS MultiProtocol Label Switching NACF Network Attachment Control Function NGN Next Generation Network nrt-VBR non real-time Variable Bit Rate OAM Operation, Administration and Maintenance OTH Optical Transport Hierarchy P-Tag Provider
42、Tag PAE Port Access Entity PD-FE Policy Decision Functional Entity PDH Plesiochronous Digital Hierarchy PE-FE Policy Enforcement Functional Entity PE Provider Edge PNNI Private Network to Network Interface QoS Quality of Service RACF Resource and Admission Control Functions RADIUS Remote Authenticat
43、ion Dial In User Service RARP Reverse Address Resolution Protocol RSVP Resource ReserVation Protocol S-Tag Service VLAN Tag SCF Service Control Functions SDH Synchronous Digital Hierarchy SGSN Serving GPRS Support Node SLA Service Level Agreement SONET Synchronous Optical Network TE Traffic Engineer
44、ing TPID Tag Protocol Identifier TRC-FE Transport Resource Control Functional Entity Rec. ITU-T Y.2113 (01/2009) 5 UNI User to Network Interface VBR Variable Bit Rate VC Virtual Connection VLAN Virtual Local Area Network VPLS Virtual Private LAN Service VPN Virtual Private Network 5 Conventions None
45、. 6 Concept and general requirements for the Ethernet-based NGN 6.1 Definition of Ethernet-based NGN concept The key idea of Ethernet-based NGN is to use the Ethernet frame format throughout an NGN transport network. No format conversion occurs during the end-to-end delivery of Ethernet frames. With
46、out a change in the basic Ethernet frame format, it is required that the Ethernet header fields contain information of QoS provisioning as specified in IEEE 802.1Q in order to support the control and management functions of NGN. Ethernet-based NGN means the network using the Ethernet technology thro
47、ugh any physical media, including fixed and wireless environments in the NGN transport stratum. The Ethernet-based NGN services are various services provided by network operators using Ethernet transport networks. Figure 1 illustrates the generic architecture model and services of Ethernet-based NGN
48、. The Ethernet is a transfer medium for core transport as well as the access transport of NGN. It is optional that non-Ethernet-based access networks (e.g., DSL) are connected to Ethernet-based core networks. However, non-Ethernet-based access network technologies are beyond the scope of this Recomm
49、endation. Figure 1 Generic architecture model and services of Ethernet-based NGN 6.2 General requirements for Ethernet-based NGN service The general requirements for the Ethernet-based NGN service fall into two categories: user equipment and network. 6 Rec. ITU-T Y.2113 (01/2009) User equipment is required to: Support the same Ethernet frame format for fixed and wireless transport interfaces while various transport technologies are applied. Provide auto-discovery cap
