1、 International Telecommunication Union ITU-T G.8011.2/Y.1307.2TELECOMMUNICATION 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 virtual private line service Recommendation ITU-T G.8011.2/Y.1307.2 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CI
3、RCUITS G.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 L
4、INKS AND 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.99
5、9 MULTIMEDIA 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 as
6、pects G.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.8011.2/Y.1307.2 (08/2013) i Recommendation ITU-T G.8011.2/Y.1307.2 Ethernet virtual priva
7、te line service Summary Recommendation ITU-T G.8011.2/Y.1307.2 defines the service attributes and parameters for carrying Ethernet characteristic information over shared bandwidth, point-to-point connections provided by synchronous digital hierarchy (SDH), plesiochronous digital hierarchy (PDH), asy
8、nchronous transfer mode (ATM), multi-protocol label switching (MPLS), optical transport hierarchy (OTH), Ethernet MAC layer network (ETH) or Ethernet PHY layer network (ETY) server layer networks. This type of service is referred to as Ethernet virtual private line (EVPL) service. This Recommendatio
9、n 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.8011.2/Y.1307.2 2005-09-22 15 11.1002/1000/8531-en 2.0 ITU-T G.8011.2/Y.1307.2 2009-01-13 15 11.1002/1000/9657-en 3.0 ITU-T G.8011.
10、2/Y.1307.2 2013-08-29 15 11.1002/1000/12004-en Keywords Ethernet, Ethernet service, virtual private line. _ *To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002
11、/1000/11830-en. ii Rec. ITU-T G.8011.2/Y.1307.2 (08/2013) FOREWORD The International 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)
12、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), which meets every four years
13、, 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 ITU-Ts purview, the necess
14、ary 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 Recommendation is voluntary. However,
15、 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 “must“ and the negative equ
16、ivalents 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 may involve the use of a
17、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 this Recommendation, ITU h
18、ad 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 urged to consult the TSB patent database at http:/www.itu.i
19、nt/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. ITU-T G.8011.2/Y.1307.2 (08/2013) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere 2
20、3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 3 5 Conventions 3 6 Ethernet virtual private lines . 4 6.1 Description . 4 6.2 EVPL service architecture 4 7 Ethernet virtual connection (EVC) service attributes for EVPL 8 7.1 Ethernet connection (EC) service attributes for E
21、VPL 9 8 EVPL UNI attributes 10 9 EVPL NNI attributes 11 10 Connectivity monitoring . 11 Rec. ITU-T G.8011.2/Y.1307.2 (08/2013) 1 Recommendation ITU-T G.8011.2/Y.1307.2 Ethernet virtual private line service 1 Scope This Recommendation defines the service attributes and parameters for carrying Etherne
22、t characteristic information over shared-bandwidth, point-to-point connections provided by SDH, ATM, MPLS, PDH, ETY, OTH, ETH or ETY server layer networks. This type of service is referred to as Ethernet virtual private line (EVPL) service. This Recommendation is based on the Ethernet service framew
23、ork as defined in ITU-T G.8011 and MEF 10.2, and is aligned with the EVPL specified in MEF 6.1. 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, th
24、e 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 Recommendations and other references listed below. A list of the currentl
25、y 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.809 Recommendation ITU-T G.809 (2003), Functional architecture of connectionless layer networks. ITU-T G.8
26、001 Recommendation ITU-T G.8001/Y.1354 (2013), Terms and definitions for Ethernet 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.
27、8011.1 Recommendation ITU-T G.8011.1/Y.1307.1 (2013), Ethernet private line service. ITU-T G.8012 Recommendation ITU-T G.8012/Y.1308 (2007), Ethernet UNI and Ethernet NNI. ITU-T G.8012.1 Recommendation ITU-T G.8012.1/Y.1308.1 (2012), Interfaces for the Ethernet transport network. ITU-T G.8013 Recomm
28、endation ITU-T G.8013/Y.1731 (2013), OAM functions and mechanisms for Ethernet based networks. ITU-T G.8021.1 Recommendation ITU-T G.8021.1/Y.1341.1 (2012), Types and characteristics of Ethernet transport network equipment. IEEE 802.1AX IEEE 802.1AX-2008, IEEE Standard for Local and metropolitan are
29、a networks Link Aggregation. IEEE 802.1D IEEE 802.1D-2004, IEEE Standard for local and metropolitan area networks Media Access Control (MAC) Bridges. IEEE 802.1Q IEEE 802.1Q-2011, IEEE Standard for local and metropolitan area networks Media Access Control (MAC) Bridges and Virtual Bridged Local Area
30、 Networks. 2 Rec. ITU-T G.8011.2/Y.1307.2 (08/2013) IEEE 802.3 IEEE 802.3-2012, IEEE Standard for Ethernet. MEF 6.1 The Metro Ethernet Forum MEF (2008), Ethernet Services Definitions Phase 2. MEF 6.1.1 The Metro Ethernet Forum MEF (2012), Layer 2 Control Protocol Handling Amendment to MEF 6.1. MEF 1
31、0.2 The Metro Ethernet Forum MEF (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 Interfac
32、e (ENNI) Phase 2. MEF 30 The Metro Ethernet Forum MEF (2012), Service OAM Fault Management Implementation Agreement. MEF 35 The Metro Ethernet Forum MEF (2012), Service OAM Performance Monitoring Implementation Agreement. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the followi
33、ng 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 ETH link: See clause 6.6 of ITU-T G.8010. 3.1.5 Ethernet connection (EC): ITU-T G.8001. 3.1.6 Ethernet service: ITU-T G.8001. 3.1.7 Ethernet service instance: ITU-T G.8001. 3.1.8 Et
34、hernet virtual connection (EVC): 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 EVPL type 1: ITU-T G.8001. 3.1.12 EVPL type 2: ITU-T G.8001. 3.1.13 EVPL type 3: ITU-T G.8001. 3.1.14 operator virtual connection (OVC): MEF 26.1. 3.1.15 OVC end point: MEF 26.1. 3.1.16 s
35、ubnetwork: See clause 6.3.2 of ITU-T G.800. 3.2 Terms defined in this Recommendation None. Rec. ITU-T G.8011.2/Y.1307.2 (08/2013) 3 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: ATM Asynchronous Transfer Mode CBS Committed Burst Size CI Characteristi
36、c Information CIR Committed Information Rate CL-PS Connectionless Packet Switched CO-CS Connection Oriented Circuit Switched CO-PS Connection Oriented Packet Switched EC Ethernet Connection EIR Excess Information Rate EPL Ethernet Private Line ETH Ethernet MAC layer network ETH_CI Ethernet MAC Chara
37、cteristic Information ETY Ethernet PHY layer network EVC Ethernet Virtual Connection 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 Transpor
38、t Network OVC Operator Virtual Connection PDH Plesiochronous Digital Hierarchy PHY Physical device SDH Synchronous Digital Hierarchy UNI User Network Interface 5 Conventions In this Recommendation, the Ethernet connection (EC) is functionally equivalent to the EC defined in MEF 12.1. The EC is used
39、to describe the network underlying the Ethernet Private Line (EPL) service. To describe the EVPL service, this Recommendation uses the term Ethernet virtual connection (EVC) as equivalent to the EVC as defined in MEF 10.2. In this Recommendation, the term shared server layer is equivalent to a serve
40、r layer that is supporting Ethernet links with an ITU-T G.8011 Ethernet connection link type attribute of shared. 4 Rec. ITU-T G.8011.2/Y.1307.2 (08/2013) 6 Ethernet virtual private lines This Recommendation defines an Ethernet virtual private line (EVPL) service. This definition is based on the Eth
41、ernet transport architecture described in ITU-T G.8010. The base Ethernet services attributes are imported from MEF 10.2 and the base definitions for EVPL are imported from MEF 6.1 to ensure alignment. This Recommendation adds further explanation to some of these attributes to clearly show the relat
42、ionship to ITU-T G.8010. In addition, several ITU specific attributes are defined to provide a superset definition. 6.1 Description An EVPL service is a point-to-point service between two demarcation points as illustrated in Figure 6-1. The service is provided over connection-oriented or connectionl
43、ess server layer networks. The service has a committed information rate (CIR), committed burst size (CBS), excess information rate (EIR) and excess burst size (EBS). Note that if a CO-PS or CL-PS server layer is used, traffic management is required to ensure that the CIR and EIR are maintained. G.80
44、11.2-Y.1307.2(13)_F6-1Ethernet virtual connection attributesUNICustomer UNI-NTransport operatornetworkUNI-N to UNI-NUNI-C to UNI-CUNIUNI-C CustomerUNI-N UNI-CUNIattributesAccess AccessUNIattributesEthernet connection attributesInternalNNINNINNINNIattributesFigure 6-1 Ethernet virtual private line Th
45、e ITU-T G.8010 maintenance entities (ME) listed in Table 6-1 of ITU-T G.8011 are shown at the bottom of Figure 6-1 and apply to EVPL. Additional details on the use of these for management of Ethernet services are described in ITU-T G.8013. 6.2 EVPL service architecture There are three types of EVPL
46、described in this clause: EVPL type 1 (multiplexed access with dedicated server layer); EVPL type 2 (shared server layer with dedicated access); EVPL type 3 (shared server layer with multiplexed access). These types are based on a combination of ITU-T G.8011 attributes as shown in Table 6-1 below. T
47、he subtypes shown in the following clauses are degenerate cases of the base type. Rec. ITU-T G.8011.2/Y.1307.2 (08/2013) 5 Table 6-1 EVPL types Type Shared server layer Multiplexed access EVPL type 1 N Y EVPL type 2 Y N EVPL type 3 Y Y EPL (see ITU-T G.8011.1) N N The components used to support an E
48、VPL service shown in the figures of this clause are: the Ety-UNIs (UNI-N, UNI-C); the Ety-NNI; the Ethernet virtual connection; the access link. The EVPL service uses an Ethernet UNI and is supported over Ethernet NNIs. EVPL type 1 service can specifically be supported over Ethernet-over-PDH, Ethern
49、et-over-SDH, and Ethernet-over-OTH NNIs. EVPL type 1 service may also be supported over Ethernet-over-ATM with CIR and Ethernet-over-MPLS with CIR NNIs. EVPL type 2 and type 3 services can be supported over Ety-NNI in addition to those indicated for type 1. EVPL type 2 service may also be supported over Ethernet-over-ATM, Ethernet-over-Ethernet, and Ethernet-over-MPLS with CIR, EIR, CBS and EBS NNIs.
