1、 International Telecommunication Union ITU-T G.8011.1/Y.1307.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2013) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Packet over Transport aspects Ethernet over Transport aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, IN
2、TERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Ethernet private line service Recommendation ITU-T 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
3、.100G.199 GENERAL CHARACTERISTICS 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
4、 INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIM
5、EDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 Ethernet over Transport aspects G.8000G.8099MPLS over Transport aspects G.
6、8100G.8199 Quality and availability targets G.8200G.8299 Service Management G.8600G.8699 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.8011.1/Y.1307.1 (08/2013) i Recommendation ITU-T G.8011.1/Y.1307.1 Ethernet private line service
7、Summary Recommendation ITU-T G.8011.1/Y.1307.1 defines the service attributes and parameters for carrying Ethernet characteristic information over dedicated bandwidth, point-to-point connections, provided by SDH, PDH, ETY, ETH, ATM, MPLS or OTH server layer networks. This type of service is referred
8、 to as Ethernet private line (EPL) service. This Recommendation is based on the Ethernet service framework as defined in Recommendation ITU-T G.8011/Y.1307. History Edition Recommendation Approval Study Group Unique ID*1.0 ITU-T G.8011.1/Y.1307.1 2004-08-22 15 11.1002/1000/7360-en 1.1 ITU-T G.8011.1
9、/Y.1307.1 (2004) Cor. 1 2005-06-29 15 11.1002/1000/7361-en 2.0 ITU-T G.8011.1/Y.1307.1 2009-01-13 15 11.1002/1000/9656-en 3.0 ITU-T G.8011.1/Y.1307.1 2013-08-29 15 11.1002/1000/12003-en Keywords Ethernet, Ethernet service, private line. _ *To access the Recommendation, type the URL http:/handle.itu.
10、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 Rec. ITU-T G.8011.1/Y.1307.1 (08/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field
11、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 Recommendations on them with a view to standardizing
12、 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. The approval of ITU-T Recommendations is covered by
13、 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 Recommendation, the expression “Administration“ is used for conciseness to indicate bo
14、th 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., interoperability or applicability) and compliance with the Recommendation is achieved when
15、 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 Recommendation is required of any party. INTELLECTUAL PROPERTY
16、 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 evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted b
17、y 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 may be required to implement this Recommendation. However, implementers are cautioned that t
18、his 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 2014 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. IT
19、U-T G.8011.1/Y.1307.1 (08/2013) iii Table of 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 3 5 Conventions 4 6 Ethernet private lines 4 6.1 Description . 4 6.2 EPL type 1 service archite
20、cture 5 6.3 EPL type 2 service architecture 5 7 Ethernet virtual connection (EVC) attributes for EPL . 7 7.1 Ethernet virtual connection (EVC) attributes for EPL type 1 7 7.2 Ethernet virtual connection (EVC) attributes for EPL type 2 8 7.3 Ethernet connection (EC) attributes for both EPL types 9 8
21、EPL type 1 UNI attributes 10 8.1 ETH_UNI attributes . 10 9 EPL type 1 NNI attributes 11 9.1 ETH_NNI attributes . 11 10 Connectivity monitoring . 11 Annex A EPL type 1 network models 12 Rec. ITU-T G.8011.1/Y.1307.1 (08/2013) 1 Recommendation ITU-T G.8011.1/Y.1307.1 Ethernet private line service 1 Sco
22、pe 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, PDH, ETY or OTH server layer networks. This type of services is referred to as Ethernet private line
23、 (EPL) service. This Recommendation is based on the Ethernet service framework as defined in ITU-T G.8011 and is aligned with the EPL specified in MEF 6.1. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provi
24、sions 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 possibility of applying the most recent edition of the Recommendatio
25、ns 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 Recommendation. ITU-T G.707 Recommendation ITU-T G.707/Y.1322 (2007),
26、Network node interface for the synchronous digital hierarchy (SDH). ITU-T G.709 Recommendation ITU-T G.709/Y.1331 (2012), Interfaces for the Optical Transport Network (OTN). ITU-T G.805 Recommendation ITU-T G.805 (2000), Generic functional architecture of transport networks. ITU-T G.809 Recommendati
27、on ITU-T G.809 (2003), Functional architecture of connectionless layer networks. ITU-T G.7043 Recommendation ITU-T G.7043/Y.1343 (2004), Virtual concatenation of plesiochronous digital hierarchy (PDH) signals. ITU-T G.8001 Recommendation ITU-T G.8001/Y.1354 (2013), Terms and definitions for Ethernet
28、 frames over transport. 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 (2012), Ethernet service characteristics. ITU-T G.8012 Recommendation ITU-T G.8012/Y.1308 (2004), Ethernet UNI and Ethernet NNI. IT
29、U-T G.8012.1 Recommendation ITU-T G.8012.1/Y.1308.1 (2012), Interfaces for the Ethernet transport network. ITU-T G.8013 Recommendation ITU-T G.8013/Y.1731 (2013), OAM functions and mechanisms for Ethernet based networks. ITU-T G.8021 Recommendation ITU-T G.8021/Y.1341 (2012), Characteristics of Ethe
30、rnet transport network equipment functional blocks. ITU-T G.8021.1 Recommendation ITU-T G.8021.1/Y.1341.1 (2012), Types and characteristics of Ethernet transportation network equipment. 2 Rec. ITU-T G.8011.1/Y.1307.1 (08/2013) IEEE 802.3 IEEE 802.3-2012, IEEE Standard for Ethernet. IEEE 802.1Q IEEE
31、802.1Q-2011, IEEE Standard for Local and metropolitan area networks Media Access Control (MAC) Bridges and Virtual Bridged Local Area Networks. MEF 6.1 MEF 6.1 (2008), Ethernet Services Definitions Phase 2. MEF 6.1.1 MEF 6.1.1 (2012), Layer 2 Control Protocol Handling Amendment to MEF 6.1. MEF 10.2
32、MEF 10.2 (2009), Ethernet Services Attributes Phase 2. MEF 12.1 The Metro Ethernet Forum MEF (2010), Carrier Ethernet Network Architecture Framework Part 2: Ethernet Services Layer Basic Elements. MEF 26.1 The Metro Ethernet Forum MEF (2012), External Network Network Interface (ENNI) Phase 2. 3 Defi
33、nitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 access link: ITU-T G.8001. 3.1.2 customer: ITU-T G.8001. 3.1.3 ENNI: MEF 26.1. 3.1.4 EPL type 1: ITU-T G.8001. 3.1.5 EPL type 2: ITU-T G.8001. 3.1.6 ETH link: See clause 6.6 of ITU-T G.8010. 3.1
34、.7 Ethernet service: ITU-T G.8001. 3.1.8 Ethernet service instance: ITU-T G.8001. 3.1.9 Ety-NNI: ITU-T G.8001. 3.1.10 Ety-UNI: ITU-T G.8001. 3.1.11 flow point: ITU-T G.809. 3.1.12 flow termination: ITU-T G.809. 3.1.13 link connection: ITU-T G.805. 3.1.14 service frame: MEF 10.2. 3.1.15 subnetwork: I
35、TU-T G.805. 3.1.16 subnetwork connection: ITU-T G.805. 3.1.17 termination flow point: ITU-T G.809. 3.1.18 traffic conditioning function: ITU-T G.8001. 3.2 Terms defined in this Recommendation None. Rec. ITU-T G.8011.1/Y.1307.1 (08/2013) 3 4 Abbreviations and acronyms This Recommendation uses the fol
36、lowing abbreviations and acronyms: ATM Asynchronous Transfer Mode CBR Constant Bit Rate CBS Committed Burst Size CI Characteristic Information CIR Committed Information Rate CO-PS Connection-Oriented Packet Switched CoS Class of Service EC Ethernet Connection EIR Excess Information Rate ENNI Etherne
37、t NNI EPL Ethernet Private Line ETH Ethernet MAC layer network ETH_CI Ethernet MAC Characteristic Information ETY Ethernet physical layer network ETYn Ethernet physical layer network of order n Ety-NNI Ethernet over Transport NNI Ety-UNI Ethernet UNI EVC Ethernet Virtual Connection GFP Generic Frami
38、ng Procedure LCAS Link Capacity Adjustment Scheme MAC Media Access Control MEF Metro Ethernet Forum MEG Maintenance Entity Group MEP Maintenance End Point MIP Maintenance Intermediate Point MPLS Multi-Protocol Label Switching MTU Maximum Transmission Unit NNI Network to Network Interface OAM Operati
39、ons, Administration, Maintenance OTH Optical Transport Hierarchy OTN Optical Transport Network PDH Plesiochronous Digital Hierarchy PHY Physical device SDH Synchronous Digital Hierarchy UNI User Network Interface 4 Rec. ITU-T G.8011.1/Y.1307.1 (08/2013) 5 Conventions In this Recommendation the Ether
40、net connection (EC) is functionally equivalent to the EC defined in MEF 12.1. The EC is used to describe the network underlying the Ethernet private line (EPL) service. To describe the EPL service, this Recommendation uses the term Ethernet virtual connection (EVC) as equivalent to the EVC as define
41、d in MEF 10.2. 6 Ethernet private lines This Recommendation defines an Ethernet private line (EPL) service. This definition is based on the Ethernet transport architecture described in ITU-T G.8010. Unlike the original version of this Recommendation, the base Ethernet services attributes and their d
42、efinitions are imported from MEF 10.2 and the base definitions for EPL are imported from MEF 6.1 to ensure alignment. This Recommendation adds further explanation to some of these attributes, to clearly show the relationship with ITU-T G.8010. In addition, several ITU-T specific attributes are defin
43、ed to provide a superset definition. 6.1 Description An EPL service is a point-to-point service between two demarcation 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 la
44、yer is used, traffic management is 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. Figure 6-1 Ethernet private line 6.1.1 EPL t
45、ype 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, ETH, ATM, MPLS or OTH network. This is refe
46、rred to as EPL type 1 and described below. An example of EPL type 1 is shown in Annex A. In addition, EPL type 1 can be further subdivided into Option 1 and Option 2 based on the handling of Layer 2 control protocols. Option 1 reflects the current IEEE standards, while Option 2 follows MEF 6.1 proce
47、ss requirements that do not align with current IEEE standards. Both options are now defined in MEF 6.1.1. Rec. ITU-T G.8011.1/Y.1307.1 (08/2013) 5 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 and the
48、 10 Gbit/s Ethernet interface signal. The line code information of the symbol stream (ETC_CI) within the interface signal is transported through the transport network, instead of the Ethernet MAC frames. In the case of 1 Gbit/s Ethernet, the symbols are transcoded prior to transmission. This is refe
49、rred to as EPL type 2. 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 virtual connection; the access link. The EPL type 1 service uses an Ety-UNI and is supported over Ethernet-over-PDH, Ethernet-over-SDH and Ethernet-over-OTH Ety-NNIs. EPL type 1 service can also use Ethernet-over-ATM wit
