1、 International Telecommunication Union ITU-T G.8012.1/Y.1308.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2012) 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 Interfaces for the Ethernet transport network Recommendation ITU-T G.8012.1/Y.1308.1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTION
3、S 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 OR SAT
4、ELLITE 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 SYSTEM G
5、.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 Tran
6、sport 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.8012.1/Y.1308.1 (12/2012) i Recommendation ITU-T G.8012.1/Y.1308.1 Interfaces for
7、 the Ethernet transport network Summary Recommendation ITU-T G.8012.1/Y.1308.1 defines the interfaces of the Ethernet transport network to be used within and between subnetworks of the Ethernet network, in terms of Ethernet transport hierarchy, formats for mapping and multiplexing client signals int
8、o Ethernet connections and formats for multiplexing Ethernet connection signals into Ethernet or non-Ethernet connection signals. These interfaces support the transport of Ethernet services, so-called Ethernet virtual connection (EVC) services, as defined in Recommendation ITU-T G.8011. The Ethernet
9、 connections support E-Line, E-Tree and E-LAN Ethernet services as defined in Recommendation ITU-T G.8011/Y.1307. History Edition Recommendation Approval Study Group 1.0 ITU-T G.8012.1/Y.1308.1 2012-12-22 15 ii Rec. ITU-T G.8012.1/Y.1308.1 (12/2012) FOREWORD The International Telecommunication Union
10、 (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 responsible for studying technical, operating and tariff questions and
11、 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 groups which, in turn, produce Recommendations on thes
12、e 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 with ISO and IEC. NOTE In this Recommendation, the expre
13、ssion “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 provisions (to ensure, e.g., interoperability or applicabi
14、lity) 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 such words does not suggest that compliance with the R
15、ecommendation 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 position concerning the evidence, validity or applicabilit
16、y 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, protected by patents, which may be required to implement th
17、is 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 2013 All rights reserved. No part of this publication may be reproduced, by any means wha
18、tsoever, without the prior written permission of ITU. Rec. ITU-T G.8012.1/Y.1308.1 (12/2012) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 3 3.1 Terms defined elsewhere 3 3.2 Terms defined in this Recommendation . 3 4 Abbreviations and acronyms 4 5 Conventions 5 6 Ethernet trans
19、port network interface structure . 5 6.1 Basic signal structure 5 6.2 Information structure for the Ethernet and Ethernet over Transport interfaces . 8 7 Multiplexing/aggregation principles . 11 8 Ethernet transport module. 11 9 Physical media of the Ethernet and Ethernet over Transport NNI and UNI
20、11 9.1 802.3 Ethernet LAN . 11 9.2 Synchronous Ethernet LAN . 11 9.3 OTN 11 10 Ethernet connection (EC) . 11 10.1 EC traffic unit structure 11 10.2 EC types and identifiers 12 10.3 EC tag formats 14 10.4 EC reserved addresses 15 11 Ethernet switched path (ESP) . 15 11.1 ESP traffic unit structure 15
21、 11.2 ESP types and identifiers 15 11.3 ESP header format 16 13 Ethernet OAM 16 14 Ethernet maintenance signals . 18 15 Mapping of client signals . 19 15.1 EC on UNI to S-EC client/server . 22 15.2 EC on UNI to BS-EC client/server . 29 16 Multiplexing/aggregation of Ethernet connection signals 33 16
22、.1 Ethernet virtual channel to virtual channel . 33 16.2 Ethernet virtual channel to virtual path 35 16.3 Ethernet virtual channel to virtual section 40 16.4 Ethernet virtual path to virtual section . 42 16.5 Ethernet switched path to virtual section 44 iv Rec. ITU-T G.8012.1/Y.1308.1 (12/2012) Page
23、 16.6 Ethernet virtual section to physical medium 46 Annex A EVC EC peering and EVC EC client/server relationships . 49 Appendix I P2P, RMP, MP2MP, hairpin Ethernet connection identifiers . 51 I.1 RMP Ethernet connection identifiers . 52 I.2 MP2MP Ethernet connection identifiers 60 Appendix II Relat
24、ionship between ITU-T G.8012.1 Ethernet connection types and MEF Ethernet connection types 65 II.1 Introduction 65 II.2 MEF EC and ITU-T G.8012.1 EC relationship examples 65 Appendix III Relationship between EVC packet format and traffic units on Ethernet UNI . 79 III.1 Relationship between untagged
25、 C-EC traffic unit and EVC packet on Ethernet UNI 79 III.2 Relationship between (Priority) C-Tagged C-EC traffic unit and EVC packet on Ethernet UNI 79 III.3 Relationship between S-Tagged S-EC traffic unit and EVC packet on Ethernet UNI 80 III.4 Relationship between I-Tagged BS-EC traffic unit and E
26、VC packet on Ethernet UNI 81 III.5 Relationship between Non-S-Tagged Link EC traffic unit and EVC packet on Ethernet UNI 82 III.6 Relationship between Priority-S-Tagged Link EC traffic unit and EVC packet on Ethernet UNI 83 III.7 Relationship between Link EC traffic unit and EVC packet on Ethernet U
27、NI . 84 Appendix IV Ethernet connection (EC) over SDH VC-n . 86 IV.1 S-EC to SDH VC 86 IV.2 B-EC to SDH VC . 86 IV.3 L-EC to SDH VC 87 IV.4 Ethernet OAM support in EC over SDH VC . 88 Bibliography. 89 Rec. ITU-T G.8012.1/Y.1308.1 (12/2012) 1 Recommendation ITU-T G.8012.1/Y.1308.1 Interfaces for the
28、Ethernet transport network 1 Scope This Recommendation defines the interfaces of the Ethernet transport network to be used within and between subnetworks of the Ethernet network, in terms of Ethernet transport hierarchy, formats for mapping and multiplexing client signals into Ethernet connections a
29、nd formats for multiplexing Ethernet connection signals into Ethernet or non-Ethernet connection signals. These interfaces support the transport of Ethernet services, so-called Ethernet virtual connection (EVC) services, as defined in ITU-T G.8011. The Ethernet connections support e-Line, E-Tree and
30、 E-LAN Ethernet services as defined in ITU-T G.8011. This Recommendation specifies the interworking aspects between EVC service signals on an Ethernet user-to-network interface (UNI) and Ethernet connection signals on an Ethernet network-to-network interface (NNI). This Recommendation does not speci
31、fy the Ethernet component and/or equipment models to meet the Ethernet NNI. Those components and models are defined in ITU-T G.8021 and ITU-T G.8021.1. The interfaces defined in this Recommendation can be applied at NNIs and UNIs of the Ethernet transport network. The Ethernet UNI is formed by an Et
32、hernet interface and the Ethernet NNI by an Ethernet interface or an Ethernet over Transport interface. The Ethernet over Transport NNI uses various server layer networks like optical transport hierarchy (OTH) and SDH. ITU-T G.8012 describes the mapping of ETH_CI into those server layers mainly for
33、Ethernet private line applications. This Recommendation describes the mapping of S-EC, B-EC, BS-EC, L-EC and ESP signals into those server layers for an Ethernet transport network application which deploys a mix of ETY and OTH server layers. It is recognized, for Ethernet over Transport interfaces u
34、sed within Ethernet subnetworks, that aspects of the interface are transport technology dependent. The transport technology dependent aspects are defined in the transport technology specific Recommendations, e.g., ITU-T G.709 and ITU-T G.707. The operations, administration and maintenance (OAM) func
35、tionality necessary for operations and management of Ethernet subnetworks is described in ITU-T G.8013. The detailed requirements are specified in a number of ITU-T Recommendations, IEEE Standards and MEF Technical Specifications, which are referred to. This Recommendation provides a description of
36、the applicability of Ethernet OAM to the different types of Ethernet connections. Note that ITU-T G.8012 was developed prior to ITU-T G.8013 and did not discuss Ethernet OAM. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this tex
37、t, 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 possibility of applying the most recent edition o
38、f 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 Recommendation. ITU-T G.707 Recommendation ITU-T G.
39、707/Y.1322 (2007), 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). 2 Rec. ITU-T G.8012.1/Y.1308.1 (12/2012) ITU-T G.800 Recommendation ITU-T G.800 (2012), Unified functional
40、architecture of transport networks. ITU-T G.841 Recommendation ITU-T G.841 (1998), Types and characteristics of SDH network protection architectures. ITU-T G.842 Recommendation ITU-T G.842 (1997), Interworking of SDH network protection architectures. ITU-T G.873.1 Recommendation ITU-T G.873.1 (2011)
41、, Optical Transport Network (OTN): Linear protection. ITU-T G.873.2 Recommendation ITU-T G.873.2 (2012), ODUk Shared Ring Protection. ITU-T G.7041 Recommendation ITU-T G.7041/Y.1303 (2011), Generic framing procedure. ITU-T G.8001 Recommendation ITU-T G.8001/Y.1354 (2012), Terms and definitions for E
42、thernet 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
43、NNI. ITU-T G.8013 Recommendation ITU-T G.8013/Y.1731 (2011), OAM functions and mechanisms for Ethernet based networks. ITU-T G.8021 Recommendation ITU-T G.8021/Y.1341 (2012), Characteristics of Ethernet transport network equipment functional blocks. ITU-T G.8021.1 Recommendation ITU-T G.8021.1/Y.134
44、1.1 (2012), Types and characteristics of Ethernet transport network equipment. ITU-T G.8031 Recommendation ITU-T G.8031/Y.1342 (2011), Ethernet Linear Protection Switching. ITU-T G.8032 Recommendation ITU-T G.8032/Y.1344 (2012), Ethernet ring protection switching. ITU-T G.8262 Recommendation ITU-T G
45、.8262/Y.1362 (2010), Timing characteristics of a synchronous Ethernet equipment slave clock. ITU-T G.8264 Recommendation ITU-T G.8264/Y.1364 (2008), Distribution of timing information through packet networks. IEEE 802.1AX IEEE Std 802.1AX-2008 (November 2008), IEEE Standard for Local and metropolita
46、n area networks Link Aggregation. IEEE 802.1Q IEEE Std 802.1Q-2011 (August 2011), IEEE Standard for Local and metropolitan area networks Media Access Control (MAC) Bridges and Virtual Bridge Local Area Networks. IEEE 802.3 IEEE Std 802.3-2012 (August 2012), IEEE Standard for Information technology T
47、elecommunications and information exchange between 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. MEF 13 Technical Specification MEF 13 (November 2005), User
48、Network Interface (UNI) Type 1 Implementation Agreement. Rec. ITU-T G.8012.1/Y.1308.1 (12/2012) 3 MEF 26.1 Technical Specification MEF 26.1 (January 2012), External Network Network Interface (ENNI) Phase 2. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms define
49、d elsewhere: 3.1.1 virtual channel ITU-T G.800 3.1.2 virtual path ITU-T G.800 3.1.3 virtual section ITU-T G.800 3.1.4 Ethernet connection ITU-T G.8001 3.1.5 Ethernet virtual connection ITU-T G.8011 3.1.6 Ethernet link ITU-T G.8010 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 backbone Ethernet connection: An Ethernet connection of which the traffic units are
