1、 International Telecommunication Union ITU-T G.8011.4/Y.1307.4TELECOMMUNICATION 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 rooted multipoint service Recommendation ITU-T G.8011.4/Y.1307.4 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNE
3、CTIONS AND CIRCUITS 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 O
4、R SATELLITE LINKS 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 SYS
5、TEM G.900G.999 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
6、 Transport aspects 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.8011.4/Y.1307.4 (08/2013) i Recommendation ITU-T G.8011.4/Y.1307.4 Ethernet
7、virtual private rooted multipoint service Summary Recommendation ITU-T G.8011.4/Y.1307.4 defines the service attributes and parameters for carrying Ethernet characteristic information over dedicated-bandwidth or shared-bandwidth, rooted multipoint connections, provided by synchronous digital hierarc
8、hy (SDH), plesiochronous digital hierarchy (PDH), asynchronous transfer mode (ATM), multi-protocol label switching (MPLS), optical transport hierarchy (OTH), Ethernet PHY layer network (ETY) or Ethernet MAC layer network (ETH) server layer networks. This type of service is referred to as Ethernet pr
9、ivate tree (EP-Tree) and Ethernet virtual private tree services. 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.8011.4/Y.1307.4 2010-02-06 15 11.1002/1000/10425
10、-en 2.0 ITU-T G.8011.4/Y.1307.4 2013-08-29 15 11.1002/1000/12027-en _ *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/11.1002/1000/11830-en. ii Rec. ITU-T G.8011.4
11、/Y.1307.4 (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) is a permanent organ of ITU. ITU-T is
12、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, establishes the topics for study by
13、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 necessary standards are prepared on a collab
14、orative 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, the Recommendation may contain certai
15、n 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 equivalents are used to express requireme
16、nts. 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 claimed Intellectual Property Right. I
17、TU 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 had not received notice of intellectual
18、 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.int/ITU-T/ipr/. ITU 2014 All rights res
19、erved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.8011.4/Y.1307.4 (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 Recommendati
20、on . 3 4 Abbreviations and acronyms 3 5 Conventions 4 6 EVP-Tree service 5 6.1 Description . 5 6.2 EVP-Tree service architecture 6 7 EVC and EC service attributes for the EVP-Tree service 14 7.1 EVC service attributes 14 7.2 EC service attributes . 15 8 UNI service attributes for the EVP-Tree servic
21、e 16 9 NNI service attributes for the EVP-Tree service 18 9.1 INNI service attributes . 18 9.2 ENNI service attributes 18 10 Connectivity monitoring for the EVP-Tree service 18 Annex A EP-Tree service Ethernet private tree service 20 A.1 EP-Tree service 20 A.2 EVC and EC service attributes for the E
22、P-Tree service . 20 A.3 UNI service attributes for the EP-Tree service . 22 A.4 NNI service attributes for the EP-Tree service . 23 A.5 Connectivity monitoring for the EP-Tree service 23 Appendix I Examples of EVP-Tree services 24 I.1 Single root 24 I.2 Redundant root . 24 I.3 Load-balance root . 25
23、 I.4 Hierarchical branch 26 Appendix II Protection of EVP-Tree service 27 II.1 1+1 protection switching architecture 27 II.2 1:1 protection switching architecture . 28 Rec. ITU-T G.8011.4/Y.1307.4 (08/2013) 1 Recommendation ITU-T G.8011.4/Y.1307.4 Ethernet virtual private rooted multipoint service 1
24、 Scope This Recommendation defines the service attributes and parameters for carrying Ethernet characteristic information over dedicated-bandwidth or shared-bandwidth, rooted multipoint connections, provided by SDH, ATM, MPLS, PDH, ETY, OTH or ETH server layer networks. This type of service is refer
25、red to as Ethernet private tree (EP-Tree) and virtual private tree (EVP-Tree) services. The initial focus of this Recommendation will be on uni-root and bi-root EP-Tree and EVP-Tree services. This Recommendation is based on the Ethernet service framework as defined in ITU-T G.8011 and is aligned wit
26、h the EP-Tree and EVP-Tree services 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, the editions indicated were valid. All R
27、ecommendations 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 regul
28、arly 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.8001 Recommendation ITU-T G.8001/Y.1354
29、 (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.8012 Recommendation ITU-T G.8012/Y.130
30、8 (2004), 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 Recommendation ITU-T G.8013/Y.1731 (2013), OAM functions and mechanisms for Ethernet based networks. ITU-T G.8021 Recommendation ITU-T G.
31、8021/Y.1341 (2010), Characteristics of Ethernet transport network equipment functional blocks. IEEE 802.1aq IEEE 802.1aq-2012, IEEE Standard for Local and metropolitan area networks Media Access Control (MAC) Bridges and Virtual Bridged Local Area NetworksAmendment 20: Shortest Path Bridging. IEEE 8
32、02.1AX IEEE 802.1AX-2008, IEEE Standard for Local and metropolitan area networks Link Aggregation. 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 Networks. 2 Rec. ITU-T G.8011.4/Y.1307.4 (08/2013)
33、 IEEE 802.3 IEEE 802.3-2012, IEEE Standard for Ethernet. MEF 6.1 The Metro Ethernet Forum, Technical Specification MEF 6.1 (2008), Ethernet Services Definitions Phase 2. MEF 6.1.1 The Metro Ethernet Forum, Technical Specification MEF 6.1.1 (2012), Layer 2 Control Protocol Handling Amendment to MEF 6
34、.1. MEF 10.2 The Metro Ethernet Forum, Technical Specification MEF 10.2 (2009), Ethernet Services Attributes Phase 2. MEF 12.1 The Metro Ethernet Forum, Technical Specification MEF 12.1 (2010), Ethernet Services Attributes Phase 2. MEF 26.1 The Metro Ethernet Forum, Technical Specification MEF 26.1
35、(2012), External Network Network Interface (ENNI) Phase 2. MEF 30 The Metro Ethernet Forum, Technical Specification MEF 30 (2011), Service OAM Fault Management Implementation Agreement. MEF 35 The Metro Ethernet Forum, Technical Specification MEF 35 (2012), Service OAM Performance Monitoring Impleme
36、ntation Agreement. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 ENNI: MEF 26.1. 3.1.2 EP-tree service: ITU-T G.8001. 3.1.3 ETH link: See clause 6.6 of ITU-T G.8010. 3.1.4 Ethernet connection (EC): ITU-T G.8001. 3.1.5 Ethernet private
37、 tree (EP-Tree) service: ITU-T G.8001. 3.1.6 Ethernet virtual connection: (EVC) ITU-T G.8001. 3.1.5 Ethernet virtual private tree (EVP-Tree) service: ITU-T G.8001. 3.1.7 EVP-tree type 1 service: ITU-T G.8001. 3.1.8 EVP-tree type 2 service: ITU-T G.8001. 3.1.9 EVP-tree type 3 service: ITU-T G.8001. 3
38、.1.10 flow point: ITU-T G.809. 3.2 Terms defined in this Recommendation None. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: APS Automatic Protection Switching ATM Asynchronous Transfer Mode CBS Committed Burst Size CCM Continuity Check Message Rec. I
39、TU-T G.8011.4/Y.1307.4 (08/2013) 3 CE Customer Edge CF Coupling Flag CFM Connectivity Fault Management CI Characteristic Information CIR Committed Information Rate CM Colour Mode CoS Class of Service DA Destination Address DM Delay Measurement DMM Delay Measurement Message DMR Delay Measurement Repl
40、y DSCP Differentiated Services Code Point EBS Excess Burst Size EC Ethernet Connection EFM Ethernet in the First Mile EIR Excess Information Rate E-LMI Ethernet Local Management Interface ENNI External Network Network Interface ETH Ethernet MAC layer network ETH_C Ethernet Connection (function) ETH_
41、CI Ethernet MAC Characteristic Information ETH_FP Ethernet flow point ETH_SNC Ethernet Subnetwork Connection ETY Ethernet PHY layer network EVC Ethernet Virtual Connection EVP-Tree Ethernet Virtual Private Tree LACP Link Aggregation Control Protocol LBM Loopback Message LM Loss Measurement LTM Link
42、Trace Message MAC Media Access Control MEG Maintenance Entity Group MEN Metro Ethernet Network MEP MEG End Point MIP MEG Intermediate Point MPLS Multi-Protocol Label Switching MTU Maximum Transmission Unit 4 Rec. ITU-T G.8011.4/Y.1307.4 (08/2013) NNI Network-to-Network Interface OAM Operation, Admin
43、istration, Maintenance OTH Optical Transport Hierarchy OTN Optical Transport Network OVC Operator Virtual Connection PDH Plesiochronous Digital Hierarchy PHY PHYsical layer entity RSTP Rapid Spanning Tree Protocol SA Source Address SDH Synchronous Digital Hierarchy STP Spanning Tree Protocol S-VLAN
44、Service VLAN UNI User Network Interface UNI-C Customer side of UNI UNI-N Network side of UNI VLAN Virtual Local Area Network 5 Conventions In this Recommendation, the Ethernet connection (EC) is functionally equivalent to the EC defined in MEF 12.1. The EC is used to describe the network underlying
45、the Ethernet private tree (EP-Tree) and Ethernet virtual private tree (EVP-Tree) services. To describe the EP-Tree and EVP-Tree services, this Recommendation uses the term Ethernet virtual connection (EVC) as equivalent to the EVC1as defined in MEF 10.2. In this Recommendation, the EP-Tree and EVP-T
46、ree services are functionally equivalent to the EP-Tree and EVP-Tree services defined in MEF 6.1. 6 EVP-Tree service 6.1 Description An EVP-Tree service is an Ethernet service based upon a rooted-multipoint EVC as described in terms of “an Ethernet Tree Service type“ in section 6.3 of MEF 6.1. A roo
47、ted-multipoint EVC is an EVC for which each UNI is designated either as root or leaf. Ingress service frames at a root UNI can be delivered to one or more of any of the leaf UNIs in the EVC. Ingress service frames at a leaf UNI can only be delivered to one or more root UNIs in the EVC. For an EVP-Tr
48、ee service, service multiplexing may occur at none, one, or more than one of the UNIs in the EVC. _ 1NOTE The 2010 ITU-T G.8011.4 Ethernet Connection (EC) definition was based on the 2009 ITU-T G.8011 definition that made the EC and EVC essentially equivalent. However, additional clarifications from
49、 MEF 12.1 Figure 10 align with the original (2004) ITU-T G.8011 that excluded the UNI-N from the EC. As a result, ITU-T G.8011 (2012), on which this Recommendation is based, reinstates the difference between EC and EVC. Exactly where the start of the EVC is located depends on the underlying server layer. Rec. ITU-T G.8011.4/Y.1307.4 (08/2013) 5 The EVP-Tree service with only one root (i.e., uni-root)
