1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.8010/Y.1306TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2004) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital networks General aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT
2、GENERATION NETWORKS Internet protocol aspects Transport Architecture of Ethernet layer networks ITU-T Recommendation G.8010/Y.1306 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTER
3、ISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS 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 METAL
4、LIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TESTING EQUIPMENTS G.500G.599 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND
5、PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DIGITAL TERMINAL EQUIPMENTS G.7000G.7999 DIGITAL NETWORKS G.8000G.8999 General aspects G.8000G.8099 Design objectives for digital networks G.8100G.8199 Quality and availability targets G.8200G.8
6、299 Network capabilities and functions G.8300G.8399 SDH network characteristics G.8400G.8499 Management of transport network G.8500G.8599 SDH radio and satellite systems integration G.8600G.8699 Optical transport networks G.8700G.8799 For further details, please refer to the list of ITU-T Recommenda
7、tions. ITU-T Rec. G.8010/Y.1306 (02/2004) i ITU-T Recommendation G.8010/Y.1306 Architecture of Ethernet layer networks Summary This Recommendation describes the functional architecture of Ethernet networks using the modelling methodology described in ITU-T Recs G.805 and G.809. The Ethernet network
8、functionality is described from a network level viewpoint, taking into account an Ethernet network layered structure, client characteristic information, client/server layer associations, networking topology, and layer network functionality providing Ethernet signal transmission, multiplexing, routin
9、g, supervision, performance assessment, and network survivability. The functional architecture of the server layer networks used by the Ethernet network is not within the scope of this Recommendation. Such architectures are described in other ITU-T Recommendations or IETF RFCs. This Recommendation i
10、s based on the Ethernet specifications in IEEE Standards 802.1D-2003, 802.1Q-2003 and 802.3-2002, and developments of provider bridged networks. Furthermore, the architectural aspects of provider bridges currently being defined in IEEE P802.1ad task force are taken into account. This Recommendation
11、defines the Ethernet maintenance entities, but the specific impact on the transport functions of connection monitoring in a connectionless layer network is not addressed. Ethernet network survivability is intended for inclusion in a future version. This Recommendation is the first of a series of Eth
12、ernet and Ethernet over Transport-related Recommendations. Other Recommendations in this series will address e.g., equipment, OAM, service, performance aspects. Source ITU-T Recommendation G.8010/Y.1306 was approved on 22 February 2004 by ITU-T Study Group 15 (2001-2004) under the ITU-T Recommendati
13、on A.8 procedure. ii ITU-T Rec. G.8010/Y.1306 (02/2004) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for
14、 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 the topics for study by the ITU-T study
15、 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 are prepared on a collaborative basis w
16、ith 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 Recommendation may contain certain mandatory pro
17、visions (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 used to express requirements. The use of
18、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 implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no posi
19、tion 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 received notice of intellectual property, prote
20、cted by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2004 All rights reserved. No part of this publication may be reprod
21、uced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.8010/Y.1306 (02/2004) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terms and definitions . 2 4 Acronyms and abbreviations 3 5 Conventions 5 6 Functional architecture of Ethernet transport networks 6 6.1 General
22、 . 6 6.2 Ethernet network layered structure. 6 6.3 Ethernet MAC (ETH) layer network 7 6.4 Ethernet PHY (ETY) layer network. 15 6.5 Server/Client associations 16 6.6 Ethernet network topology . 23 7 Ethernet network management . 25 7.1 Ethernet maintenance entities. 25 7.2 Ethernet maintenance entity
23、 supervision techniques 28 7.3 Ethernet layer network management requirements 30 7.4 Ethernet layer network traffic management . 30 8 Ethernet survivability techniques . 30 Annex A Flow domain fragments. 31 Appendix I Flows and their properties 32 Appendix II G.8010/Y.1306 model of 2-port bridge 34
24、Appendix III Overview of the VLAN ID in the MAC SDU and VLAN ID processing 35 BIBLIOGRAPHY 35 ITU-T Rec. G.8010/Y.1306 (02/2004) 1ITU-T Recommendation G.8010/Y.1306 Architecture of Ethernet layer networks 1 Scope This Recommendation describes the functional architecture of Ethernet networks using th
25、e modelling methodology described in ITU-T Recs G.805 and G.809. The Ethernet network functionality is described from a network level viewpoint, taking into account an Ethernet network layered structure, client characteristic information, client/server layer associations, networking topology, and la
26、yer network functionality providing Ethernet signal transmission, multiplexing, routing, supervision, performance assessment, and network survivability. The functional architecture of the server layer networks used by the Ethernet network is not within the scope of this Recommendation. Such architec
27、tures are described in other ITU-T Recommendations or IETF RFCs. The bases for this Recommendation are the Ethernet specifications in IEEE 802.1D, 802.1Q and 802.3, and developments of provider bridged networks. Furthermore, the architectural aspects of provider bridges currently being defined in IE
28、EE P802.1ad task force are taken into account. This Recommendation defines the Ethernet maintenance entities, but the specific impact on the atomic functions of connection monitoring in a connectionless layer network is not addressed. This is for further study. 2 References The following ITU-T Recom
29、mendations 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 th
30、erefore 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 st
31、and-alone document, the status of a Recommendation. ITU-T Recommendation G.707/Y.1322 (2003), Network node interface for the synchronous digital hierarchy (SDH). ITU-T Recommendation G.709/Y.1331 (2003), Interfaces for the Optical Transport Network (OTN). ITU-T Recommendation G.805 (2000), Generic f
32、unctional architecture of transport networks. ITU-T Recommendation G.809 (2003), Functional architecture of connectionless layer networks. ITU-T Recommendation G.7041/Y.1303 (2003), Generic framing procedure (GFP). ITU-T Recommendation Y.1730 (2004), Requirements for OAM functions in Ethernet-based
33、networks and Ethernet services. IEEE Standard 802-2001, IEEE Standard for Local and Metropolitan Area Networks: Overview and Architecture. IEEE Standard 802.1D-2004, IEEE Standard for Local and Metropolitan Area Networks: Media Access Control (MAC) Bridges. ITU-T Rec. G.8010/Y.1306 (02/2004) 2 IEEE
34、Standard 802.1Q-2003, IEEE Standards For Local And Metropolitan Area Networks: Virtual Bridged Local Area Networks. IEEE Standard 802.2-1998, Information Technology Telecommunications and Information Exchange Between Systems Local and metropolitan area networks Specific Requirements Part 2: Logical
35、Link Control. IEEE Standard 802.3-2002, Information Technology Telecommunication and Information Exchange Between Systems LAN/MAN Specific Requirements Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications. IEEE Standard 802.3AE-2002
36、, IEEE Standard for Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications Media Access Control (MAC) Parameters, Physical Layer and Management Parameters for 10 Gb/s Operation. IETF RFC 2684 (1999), Multiprotocol Encapsulation over ATM Adapt
37、ation Layer 5. IETF RFC 3031 (2001), Multiprotocol Label Switching Architecture. 3 Terms and definitions 3.1 This Recommendation uses the following terms defined in ITU-T Rec. G.805: a) access point; b) bidirectional reference point; c) component link; d) compound link; e) connection point; f) link;
38、 g) link connection; h) network connection; i) network operator; j) serial-compound link; k) service provider; l) termination connection point; m) trail; n) trail termination. 3.2 This Recommendation uses the following terms defined in ITU-T Rec. G.809: a) access point; b) adaptation; c) adapted inf
39、ormation; d) characteristic information; e) client/server relationship; f) connectionless trail; g) flow; h) flow domain; i) flow domain flow; ITU-T Rec. G.8010/Y.1306 (02/2004) 3j) flow point; k) flow point pool; l) flow point pool link; m) flow termination; n) flow termination sink; o) flow termin
40、ation source; p) layer network; q) link flow; r) matrix; s) network; t) network flow; u) port; v) reference point; w) traffic unit; x) transport; y) transport entity; z) transport processing function; aa) termination flow point; bb) termination flow point pool. 3.3 This Recommendation defines the fo
41、llowing term: 3.3.1 traffic conditioning function: A “transport processing function“ which accepts the characteristic information of the layer network at its input, classifies the traffic units according to configured rules, meters each traffic unit within its class to determine its eligibility, pol
42、ices non-conformant traffic units and presents the remaining traffic units at its output as characteristic information of the layer network. 4 Acronyms and abbreviations This Recommendation uses the following abbreviations: AI Adapted Information AP Access Point ARP Address Resolution Protocol ATM A
43、synchronous Transfer Mode BP Bridge Protocol CI Characteristic Information cLink component Link CLPS Connectionless Packet Switched CO-CS Connection-Oriented Circuit Switched CO-PS Connection-Oriented Packet Switched CoS Class of Service CP Connection Point DP Dropping Precedence ITU-T Rec. G.8010/Y
44、.1306 (02/2004) 4ETC Ethernet Coding sublayer of ETY ETCn Ethernet Coding sublayer of order n ETH Ethernet MAC layer network ETHS ETH Segment ETY Ethernet PHY layer network ETYn Ethernet PHY layer network of order n FCS Frame Check Sequence FD Flow Domain FDF Flow Domain Flow FDFr Flow Domain Fragme
45、nt FP Flow Point FPP Flow Point Pool FT Flow Termination GARP Generic Attribute Registration Protocol GFP Generic Framing Procedure GFP-F Frame-mapped GFP GFP-T Transparent GFP IP Internet Protocol LAN Local Area Network LCAS Link Capacity Adjustment Scheme LF Link Flow M_SDU MAC Service Data Unit M
46、AC Media Access Control ME Maintenance Entity MFD Matrix Flow Domain MFDFr Matrix Flow Domain Fragment MPLS Multi-Protocol Label Switching NF Network Flow NNI Network Node Interface OAM Operations, Administration and Maintenance ODU Optical Channel Data Unit ODUk Optical Channel Data Unit-k ODUk-Xv
47、X virtually concatenated ODUks OTH Optical Transport Hierarchy OTN Optical Transport Network PCS Physical Coding Sub-layer of PHY PHY Ethernet Physical Layer entity consisting of the PCS, the PMA, and, if present, the PMD sub-layers PMA Physical Medium Attachment sub-layer of PHY PMD Physical Medium
48、 Dependent sub-layer of PHY SDH Synchronous Digital Hierarchy ITU-T Rec. G.8010/Y.1306 (02/2004) 5SDU Service Data Unit SLA Service Level Agreement TC Traffic Conditioning TCP Termination Connection Point TFP Termination Flow Point TFPP Termination Flow Point Pool TP Transmission Path TT Trail Termi
49、nation UNI User Network Interface UNI-C Customer side of UNI UNI-N Network side of UNI VC Virtual Channel VC-n Virtual Container-n VC-n-Xc X contiguously concatenated VC-ns VC-n-Xv X virtually concatenated VC-ns VID VLAN Identifier VLAN Virtual LAN VPN Virtual Private Network 5 Conventions The diagrammatic convention for connection-oriented layer networks described in this Recommendation is that of ITU-T Rec. G.805. The diagrammatic convention for connectionless layer networks described in this Recommendatio
