ITU-T Y 1222-2007 Traffic control and congestion control in Ethernet-based networks (Study Group 12)《基于以太网网络的流量控制和拥塞控制 12号研究组》.pdf
《ITU-T Y 1222-2007 Traffic control and congestion control in Ethernet-based networks (Study Group 12)《基于以太网网络的流量控制和拥塞控制 12号研究组》.pdf》由会员分享,可在线阅读,更多相关《ITU-T Y 1222-2007 Traffic control and congestion control in Ethernet-based networks (Study Group 12)《基于以太网网络的流量控制和拥塞控制 12号研究组》.pdf(18页珍藏版)》请在麦多课文档分享上搜索。
1、 International Telecommunication Union ITU-T Y.1222TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (11/2007) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Architecture, access, network capabilities and resource managemen
2、t Traffic control and congestion control in Ethernet-based networks ITU-T Recommendation Y.1222 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 mid
3、dleware 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 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.11
4、00Y.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 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 NEXT
5、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.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Numbering, naming
6、and addressing Y.2300Y.2399 Network management Y.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. ITU-T Rec. Y.1222 (11/2007) i ITU-T Recommendation Y.12
7、22 Traffic control and congestion control in Ethernet-based networks Summary ITU-T Recommendation Y.1222 provides a general description of and procedures for traffic control and congestion control in Ethernet-based networks. It describes the concepts of the traffic contract between a user and the ne
8、twork. It specifies the Ethernet transfer capabilities (ETCs) including, for each ETC, the service model, the associated traffic patterns and conformance definition for an Ethernet flow that are observable at any point in the network. Source ITU-T Recommendation Y.1222 was approved on 13 November 20
9、07 by ITU-T Study Group 12 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. Y.1222 (11/2007) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs).
10、 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 standardizing telecommunications on a worldwide basis. The World Telecommunication Sta
11、ndardization 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 covered by the procedure laid down in WTSA Resolution 1. In some areas of informati
12、on 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 indicate both a telecommunication administration and a recognized operating agency.
13、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 when all of these mandatory provisions are met. The words “shall“ or some other
14、 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 PROPERTY RIGHTS ITU draws attention to the possibility that the practice or impleme
15、ntation 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 asserted by ITU members or others outside of the Recommendation development process.
16、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 cautioned that this may not represent the latest information and are therefore strongly urg
17、ed to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2008 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. Y.1222 (11/2007) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terminol
18、ogy . 1 4 Abbreviations 2 5 Convention 3 6 Introduction 3 7 Traffic parameters and descriptors . 4 7.1 Definitions 4 7.2 Requirements on traffic parameters and traffic descriptors . 5 7.3 Traffic parameter specifications. 5 8 Ethernet transfer capabilities 6 8.1 Dedicated bandwidth (DBW) transfer ca
19、pability. 6 8.2 Statistical bandwidth (SBW) transfer capability 7 8.3 Best effort (BE) transfer capability 7 9 Functions for traffic control, congestion control and overload treatment 8 9.1 Traffic control functions. 8 9.2 Functions for congestion control and overload treatment 9 ITU-T Rec. Y.1222 (
20、11/2007) 1 ITU-T Recommendation Y.1222 Traffic control and congestion control in Ethernet-based networks 1 Scope This Recommendation describes traffic control and congestion control procedures for Ethernet-based networks. Traffic control refers to all network actions aiming to meet the negotiated pe
21、rformance objectives and negotiated QoS commitments in an Ethernet-based network, and to avoid congested conditions. Congestion control refers to all network actions to minimize the intensity, spread and duration of congestion. This Recommendation provides a general description of and procedures for
22、 traffic control and congestion control. It describes the concepts of the traffic contract between a user and the network. It specifies the Ethernet transfer capabilities (ETCs) including, for each ETC, the service model, the associated traffic patterns and conformance definition for an Ethernet flo
23、w that are observable at any point in the 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 Recommen
24、dations 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 the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly pu
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