1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.8011.1/Y.1307.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2004) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital networks General aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND N
2、EXT-GENERATION NETWORKS Internet protocol aspects Transport Ethernet private line service ITU-T Recommendation G.8011.1/Y.1307.1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERIS
3、TICS 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 METALLI
4、C 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 PE
5、RFORMANCE 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.829
6、9 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 Recommendati
7、ons. ITU-T Rec. G.8011.1/Y.1307.1 (08/2004) i ITU-T Recommendation G.8011.1/Y.1307.1 Ethernet private line service Summary This Recommendation defines the service attributes and parameters for carrying Ethernet characteristic information over dedicated bandwidth, point-to-point connections, provided
8、 by SDH, PDH, ATM, MPLS, or OTH server layer networks. This type of service is referred to as Ethernet Private Line (EPL) service. This Recommendation is based on the Ethernet service framework as defined in ITU-T Rec. G.8011/Y.1307. Source ITU-T Recommendation G.8011.1/Y.1307.1 was approved on 22 A
9、ugust 2004 by ITU-T Study Group 15 (2001-2004) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.8011.1/Y.1307.1 (08/2004) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Stand
10、ardization 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 Standardization Assembly (WTSA), wh
11、ich 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 information technology which fall within
12、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. Compliance with this Recommendat
13、ion 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 obligatory language such as “mu
14、st“ 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 implementation of this Recommendation m
15、ay 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. As of the date of approval of th
16、is Recommendation, ITU had not received notice of intellectual property, protected 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 dat
17、abase. ITU 2005 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. G.8011.1/Y.1307.1 (08/2004) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terms and definitions . 2 4 Acronyms and abbreviations 3 5 Co
18、nventions 4 6 Ethernet private lines 4 6.1 Description . 4 6.2 EPL Type 1 service architecture. 5 7 EPL type 1 service characteristics 5 7.1 Ethernet Connection (EC) attributes 5 8 EPL type 1 UNI attributes 7 8.1 ETH_UNI attributes . 7 8.2 ETY UNI attributes 10 9 EPL type 1 NNI attributes 10 9.1 ETH
19、_NNI attributes . 10 9.2 Server layer adaptation. 11 Annex A EPL type 1 network models 12 Annex B EPL type 2 . 13 B.1 EPL type 2 service characteristics 13 B.2 1 Gbit/s EPL type 2 service 13 Annex C Special case of bit transport for 10 Gbit/s Ethernet. 14 Annex D Processing of l2 control frames at t
20、he ETY/ETH adaptation 16 Appendix I Customer view and network view of Ethernet services. 17 I.1 Introduction 17 I.2 MEF G.8011.1/Y.1307.1 comparison . 17 I.3 Ethernet private line implementation . 17 Appendix II Traffic conditioning 20 II.1 Introduction 20 II.2 Traffic conditioning 20 ITU-T Rec. G.8
21、011.1/Y.1307.1 (08/2004) 1 ITU-T Recommendation G.8011.1/Y.1307.1 Ethernet private line service 1 Scope This Recommendation defines the service attributes and parameters for carrying Ethernet characteristic information over dedicated bandwidth, point-to-point connections, provided by SDH, ATM, MPLS,
22、 PDH, ETY or OTH server layer networks. This type of service is referred to as Ethernet Private Line (EPL) service. This Recommendation is based on the Ethernet service framework as defined in ITU-T Rec. G.8011/Y.1307. 2 References The following ITU-T Recommendations and other references contain pro
23、visions 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 therefore encouraged to investigate the possi
24、bility 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 stand-alone document, the status of a Recomme
25、ndation. 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.809 (2003), Functional architecture of connectionless layer netw
26、orks. ITU-T Recommendation G.7043/Y.1343 (2004), Virtual concatenation of plesiochronous digital hierarchy (PDH) signals. ITU-T Recommendation G.8010/Y.1306 (2004), Architecture of Ethernet layer networks. ITU-T Recommendation G.8011/Y.1307 (2004), Ethernet over Transport Ethernet services framework
27、. ITU-T Recommendation G.8012/Y.1308 (2004), Ethernet UNI and Ethernet NNI. ITU-T Recommendation G.8021/Y.1341 (2004), Characteristics of Ethernet transport network equipment functional blocks. IEEE 802.3-2002, IEEE Standard for Information technology Telecommunications and information exchange betw
28、een systems Local and metropolitan area networks Specific requirements Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications. IEEE 802.3ae-2002, IEEE Standard for Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Acces
29、s Method and Physical Layer Specifications-Media Access Control (MAC) Parameters, Physical Layer and Management Parameters for 10 Gb/s Operation. IEEE 802.3ah-2004, Information technology Telecommunications and information exchange between systems Local and metropolitan area networks Specific requir
30、ements Part 3: Carrier sense multiple access with collision detection (CSMA/CD) 2 ITU-T Rec. G.8011.1/Y.1307.1 (08/2004) access method and physical layer specifications Media Access Control Parameters. Physical Layers and Management Parameters for Subscriber Access Networks. IEEE 802.1X-2001, IEEE S
31、tandard for Local and metropolitan area networks Port-based Network Access Control. 3 Terms and definitions 3.1 This Recommendation uses the following terms defined in ITU-T Rec. G.8010/Y.1306: a) ETH link. 3.2 This Recommendation uses the following terms defined in ITU-T Rec. G.8011/Y.1307: a) Acce
32、ss link; b) Block; c) Committed Information Rate (CIR); d) Customer; e) Dedicated; f) Ethernet service; g) Network access point; h) Pass; i) Process (with respect to L2 control protocol frames); j) Service instance; k) Spatial. 3.3 This Recommendation uses the following terms defined in ITU-T Rec. G
33、.809: a) Flow domain; b) Flow domain flow; c) Flow Point; d) Flow termination; e) Link flow; f) Network flow; g) Termination flow point; h) Traffic conditioning function. 3.4 This Recommendation uses the following terms defined in ITU-T Rec. G.8012/Y.1308. a) Ety-NNI; b) Ety-UNI. 3.5 This Recommenda
34、tion defines the following terms: 3.5.1 EPL Type 1: An EPL Type 1 service carries the ETH_CI traffic units between two Ethernet UNIs. 3.5.2 EPL Type 2: An EPL Type 2 service carries the information from the 8B/10B symbol stream between two Ethernet UNIs. 3.5.3 N/R = not relevant: clause/subclause, w
35、hich is not relevant to this Recommendation. ITU-T Rec. G.8011.1/Y.1307.1 (08/2004) 3 4 Acronyms and abbreviations This Recommendation uses the following abbreviations: ATM Asynchronous Transfer Mode CBR Constant Bit Rate CBS Committed Burst Size CI Characteristic Information CIR Committed Informati
36、on Rate CLPS Connectionless Packet Switched CO-CS Connection-Oriented Circuit Switched CO-PS Connection-Oriented Packet Switched DA Destination Address EC Ethernet Connection EIR Excess Information Rate EPL Ethernet Private Line ETH Ethernet MAC layer network ETH_CI Ethernet MAC Characteristic Infor
37、mation ETH_FP Ethernet Flow Point ETY Ethernet PHY layer Ety-NNI Ethernet NNI Ety-UNI Ethernet UNI ETYn Ethernet physical layer network or order n EVC Ethernet Virtual Circuit FCS Frame Check Sequence FD Flow Domain GFP Generic Framing Procedure LACP Link Aggregation Control Protocol LCAS Link Capac
38、ity Adjustment Scheme MAC Media Access Control MEF Metro Ethernet Forum MPLS Multi-Protocol Label Switching NNI Network-to-Network Interface OAM Operations, Administration, Maintenance OTH Optical Transport Hierarchy OTN Optical Transport Network PA (Ethernet) Preamble PDH Plesiochronous Digital Hie
39、rarchy PHY Physical device 4 ITU-T Rec. G.8011.1/Y.1307.1 (08/2004) SA Source Address SDH Synchronous Digital Hierarchy SDU Service Data Unit SFD Start of Frame Delimiter SNCP Sub-Network Connection Protection STP Spanning Tree Protocol UNI User Network Interface 5 Conventions None. 6 Ethernet priva
40、te lines 6.1 Description An EPL service is a point-to-point service between two demarc points as illustrated in Figure 6-1. The service is provided over connection oriented server layer networks with a committed information rate (CIR). Note that if a CO-PS server layer is used traffic management is
41、required to ensure that the CIR is maintained. The level of transparency of an EPL can be either: Type 1 Frame-based characteristic information (see example in Annex A). Type 2 Character-based characteristic information (see example in Annex B). Figure 6-1/G.8011.1/Y.1307.1 Ethernet private line 6.1
42、.1 EPL Type 1 The generic method to support the transport of Ethernet MAC frames (ETH service) between two Ethernet UNIs is to terminate the Ethernet physical section layer (ETY), extract the Ethernet MAC frames (ETH_CI), and transport them over the SDH, PDH, ETY, ATM, MPLS, or OTH network. This is
43、referred to as EPL Type 1 and described below. An example of EPL Type 1 is shown in Annex A. 6.1.2 EPL Type 2 A second type of service with lower latency characteristics is defined for the 8B/10B encoded 1 Gbit/s Ethernet interface signal. The 8B/10B symbol stream (ETC_CI) within the interface signa
44、l ITU-T Rec. G.8011.1/Y.1307.1 (08/2004) 5 is encoded and transported through the transport network, instead of the Ethernet MAC frames. This is referred to as EPL Type 2, and is described in Annex B. Note that the Ethernet MAC frame is not extracted in this type of service. It essentially provides
45、transparency at the ETY layer. 6.2 EPL Type 1 service architecture The components used to support an EPL Type 1 service are shown in Figure 6-1: the Ety-UNIs (UNI-N, UNI-C); the Ety-NNI; the Ethernet connection; the Access link. The EPL Type 1 service uses a Ety-UNI and is supported over Ethernet-ov
46、er-PDH, Ethernet-over-SDH, and Ethernet-over-OTH Ety-NNIs. EPL Type 1 service can also use Ethernet-over-ATM with CIR and Ethernet-over-MPLS with CIR NNIs. The UNI and NNI are specified in ITU-T Rec. G.8012/Y.1308. Figure 6-2 shows the basic architecture of the EPL Type 1 service. The ETY layer is t
47、erminated at the UNI-N and the ETH frames are forwarded over a single ETH_FP to the server layer. G.8011.1_Y.1307.1_F6-2ServerServer/ETHETYnETYn/ETHServerServer/ETHETYnETYn/ETHEthernetphysicalinterfaceETYn_CI ETYn_CIConnects TCP at A with TCP at ZETH_FPServer subnetworkETH_FPETH_FPServer = ATM VC, M
48、PLS LSP, SDH VC, OTN ODU, PDH, ETYETH_FPEthernetphysicalinterfaceETHETHFigure 6-2/G.8011.1/Y.1307.1 Ethernet private line type 1 architecture 7 EPL type 1 service characteristics ITU-T Rec. G.8011/Y.1307 defines connections, UNI and NNI attributes for Ethernet services. In the case of an EPL service
49、, some of these attributes have fixed values or a limited allowed range of parameters. 7.1 Ethernet Connection (EC) attributes The Ethernet connection attributes are described in the following subclauses and are summarized in Table 7-1. Interworking with bridge control frames and MAC control frames is described in Tables 8-2, 8-3, 8-4, 9-2, and 9-3. 6 ITU-T Rec. G.8011.1/Y.1307.1 (08/2004) Table 7-1/G.8011.1/Y.1307.1 EC service attributes EC service attribute Service attribute parameter
