1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.8013/Y.1731 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2015) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Packet over Transport aspects Ethernet over Transport aspects SERIES Y: GLOBAL I
2、NFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Operation, administration and maintenance Operation, administration and maintenance (OAM) functions and mechanisms for Ethernet-based networks Recommendation ITU-T G.8013/Y.1731 ITU-T G-SERIES
3、 RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS 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 ME
4、TALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR 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.6
5、99 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM 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.
6、7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 Ethernet over Transport aspects G.8000G.8099 MPLS over Transport aspects G.8100G.8199 Synchronization, quality and availability targets G.8200G.8299 Service Management G.8600G.8699 ACCESS NETWORKS G.9000G.9999 For further details, please refer to
7、 the list of ITU-T Recommendations. Rec. ITU-T G.8013/Y.1731 (08/2015) i Recommendation ITU-T G.8013/Y.1731 Operation, administration and maintenance (OAM) functions and mechanisms for Ethernet-based networks Summary Recommendation ITU-T G.8013/Y.1731 provides mechanisms for user-plane OAM functiona
8、lity in Ethernet networks according to the requirements and principles given in Recommendation ITU-T Y.1730. This Recommendation is designed specifically to support point-to-point connections and multipoint connectivity in the ETH layer as identified in Recommendation ITU-T G.8010/Y.1306. The OAM me
9、chanisms defined in this Recommendation offer capabilities to operate and maintain network and service aspects of the ETH layer. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T Y.1731 2006-05-22 13 11.1002/1000/7192 2.0 ITU-T Y.1731 2008-02-29 13 11.1002/1000/9347 2.1 ITU-T
10、Y.1731 (2008) Amd. 1 2010-07-29 15 11.1002/1000/10925 3.0 ITU-T G.8013/Y.1731 2011-07-22 15 11.1002/1000/11136 3.1 ITU-T G.8013/Y.1731 (2011) Cor. 1 2011-10-29 15 11.1002/1000/11418 3.2 ITU-T G.8013/Y.1731 (2011) Amd. 1 2012-05-07 15 11.1002/1000/11511 4.0 ITU-T G.8013/Y.1731 2013-11-06 15 11.1002/1
11、000/12029 4.1 ITU-T G.8013/Y.1731 (2013) Amd. 1 2015-02-22 15 11.1002/1000/12381 5.0 ITU-T G.8013/Y.1731 2015-08-13 15 11.1002/1000/12552 _ * 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 exam
12、ple, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.8013/Y.1731 (08/2015) 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 St
13、andardization 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),
14、 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 the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall with
15、in 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 Recommen
16、dation 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 a
17、s “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 RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendati
18、on 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 by ITU members or others outside of the Recommendation development process. As of the date of approval o
19、f this Recommendation, ITU had 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 dat
20、abase at http:/www.itu.int/ITU-T/ipr/. ITU 2016 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.8013/Y.1731 (08/2015) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Ter
21、ms defined elsewhere 2 3.2 Terms defined in this Recommendation . 4 4 Abbreviations and acronyms 4 5 Conventions 6 5.1 ME group (MEG) . 7 5.2 Traffic conditioning point (TrCP) 7 5.3 MEG level 7 5.4 OAM transparency . 7 5.5 Representation of octets . 8 6 OAM relationships 8 6.1 MEs, MEPs, MIPs and Tr
22、CPs relationship 8 6.2 MEs, MEGs and MEG level relationship . 8 6.3 MEPs and MIPs configuration . 10 7 OAM functions for fault management 10 7.1 Ethernet continuity check (ETH-CC) . 10 7.2 Ethernet loopback (ETH-LB) . 12 7.3 Ethernet link trace (ETH-LT) . 15 7.4 Ethernet alarm indication signal (ETH
23、-AIS) 17 7.5 Ethernet remote defect indication (ETH-RDI) . 19 7.6 Ethernet locked signal (ETH-LCK) 20 7.7 Ethernet test signal (ETH-Test) 21 7.8 Ethernet automatic protection switching (ETH-APS) 22 7.9 Ethernet maintenance communication channel (ETH-MCC) 22 7.10 Ethernet experimental OAM (ETH-EXP) 2
24、3 7.11 Ethernet vendor-specific OAM (ETH-VSP) 23 7.12 Ethernet client signal fail (ETH-CSF) 24 7.13 Ethernet bandwidth notification (ETH-BN) . 25 7.14 Ethernet expected defect function (ETH-ED) 27 8 OAM functions for performance monitoring . 28 8.1 Frame loss measurement (ETH-LM) 29 8.2 Frame delay
25、measurement (ETH-DM) . 32 8.3 Throughput measurement . 35 8.4 Synthetic loss measurement (ETH-SLM) 35 9 OAM PDU types. 38 9.1 Common OAM information elements 39 iv Rec. ITU-T G.8013/Y.1731 (08/2015) Page 9.2 CCM PDU 41 9.3 LBM PDU 43 9.4 LBR PDU . 45 9.5 LTM PDU . 46 9.6 LTR PDU 48 9.7 AIS PDU . 50
26、9.8 LCK frame 51 9.9 TST PDU 51 9.10 APS PDU 52 9.11 MCC PDU 53 9.12 LMM PDU 54 9.13 LMR PDU 55 9.14 1DM PDU . 56 9.15 DMM PDU . 57 9.16 DMR PDU 58 9.17 EXM PDU 59 9.18 EXR PDU . 60 9.19 VSM PDU 61 9.20 VSR PDU . 62 9.21 Client signal fail (CSF) . 63 9.22 SLM PDU . 64 9.23 SLR PDU 65 9.24 1SL PDU 66
27、 9.25 BNM PDU 67 9.26 EDM PDU 69 10 OAM frame addresses 69 10.1 Multicast destination addresses 70 10.2 CCM . 70 10.3 LBM . 70 10.4 LBR 70 10.5 LTM 70 10.6 LTR . 71 10.7 AIS 71 10.8 LCK 71 10.9 TST . 71 10.10 APS . 71 10.11 MCC . 71 10.12 LMM . 71 10.13 LMR . 71 10.14 1DM 71 Rec. ITU-T G.8013/Y.1731
28、 (08/2015) v Page 10.15 DMM 71 10.16 DMR . 71 10.17 EXM . 71 10.18 EXR 72 10.19 VSM . 72 10.20 VSR 72 10.21 CSF . 72 10.22 SLM 72 10.23 SLR . 72 10.24 1SL . 72 10.25 BNM . 72 10.26 EDM . 72 11 OAM PDU validation and versioning 73 11.1 OAM PDU transmission . 74 11.2 OAM PDU validation in reception .
29、74 11.3 OAM PDU reception after validation . 75 Annex A MEG ID format . 76 A.1 ICC based MEG_ID format 76 A.2 Global MEG ID format based on CC and ICC . 77 Annex B Ethernet link trace (ETH-LT) of ITU-T Y.1731 interoperability considerations . 79 B.1 Ethernet link trace (ETH-LT) as defined in ITU-T Y
30、.1731 79 B.2 Interworking with ITU-T Y.1731 79 Appendix I Ethernet network scenarios 81 I.1 Shared MEG levels example 81 I.2 Independent MEG levels example 81 Appendix II Frame loss measurement 83 II.1 Simplified calculation for frame loss . 84 II.2 Frame counter wrapping periodicity 85 Appendix III
31、 Network OAM interworking . 86 Appendix IV Mismerge detection limitation 87 Appendix V Terminology alignment with IEEE 802.1Q . 88 Appendix VI Examples showing accuracy for ETH-SLM measurement . 89 Appendix VII ETH-LM and link aggregation 90 Bibliography. 92 vi Rec. ITU-T G.8013/Y.1731 (08/2015) Int
32、roduction ITU-T has prepared Recommendation ITU-T G.8013/Y.1731 in cooperation with the IEEE Project 802.1ag (Connectivity fault management). Since the IEEE work is now complete, this Recommendation contains amendments to fully align the final results and include the appropriate normative references
33、 to IEEE documents. Moreover, further detailed work on the implementation details (i.e., the specification of the equipment functions) has been undertaken by ITU-T. Rec. ITU-T G.8013/Y.1731 (08/2015) 1 Recommendation ITU-T G.8013/Y.1731 Operation, administration and maintenance (OAM) functions and m
34、echanisms for Ethernet-based networks 1 Scope This Recommendation specifies mechanisms required to operate and maintain the network and service aspects of the ETH layer. It also specifies the Ethernet OAM frame formats and syntax and semantics of OAM frame fields. The OAM mechanisms as described in
35、this Recommendation apply to both point-to-point ETH connections and multipoint ETH connectivity including both multipoint-to-multipoint and rooted-multipoint connections. The OAM mechanisms as described in this Recommendation are applicable to any environment independently of how the ETH layer is m
36、anaged (e.g., using network management systems or operational support systems). The architectural basis for this Recommendation is the Ethernet specification ITU-T G.8010 which also accounts for IEEE 802.1Q and IEEE 802.3. The OAM functions of the server layer networks used by the Ethernet network a
37、re not within the scope of this Recommendation. The OAM functions of the layers above the ETH layer are not within the scope of this Recommendation either. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provi
38、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
39、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.805 Recommendation ITU-T G.805 (2000), Generic
40、 functional architecture of transport networks. ITU-T G.806 Recommendation ITU-T G.806 (2012), Characteristics of transport equipment Description methodology and generic functionality. ITU-T G.809 Recommendation ITU-T G.809 (2003), Functional architecture of connectionless layer networks. ITU-T G.82
41、6 Recommendation ITU-T G.826 (2002), End-to-end error performance parameters and objectives for international, constant bit-rate digital paths and connections. ITU-T G.7710 Recommendation ITU-T G.7710/Y.1701 (2012), Common equipment management function requirements. ITU-T G.8001 Recommendation ITU-T
42、 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.8021 Recommendation ITU-T G.8021/Y.1341 (2015), Characteristics of Ethernet transport network equipment functional
43、 blocks. ITU-T G.8031 Recommendation ITU-T G.8031/Y.1342 (2015), Ethernet linear protection switching. 2 Rec. ITU-T G.8013/Y.1731 (08/2015) ITU-T G.8032 Recommendation ITU-T G.8032/Y.1344 (2015), Ethernet ring protection switching. ITU-T G.8113.1 Recommendation ITU-T G.8113.1/Y.1372.1 (2012), Operat
44、ions, administration and maintenance mechanism for MPLS-TP in packet transport networks. ITU-T M.1400 Recommendation ITU-T M.1400 (2013), Designations for interconnections among operators networks. ITU-T O.150 Recommendation ITU-T O.150 (1996), General requirements for instrumentation for performanc
45、e measurements on digital transmission equipment. ITU-T T.50 Recommendation ITU-T T.50 (1992), International Reference Alphabet (IRA) (Formerly International Alphabet No. 5 or IA5) Information technology 7-bit coded character set for information interchange. ITU-T Y.1563 Recommendation ITU-T Y.1563
46、(2009), Ethernet frame transfer and availability performance. ITU-T Y.1564 Recommendation ITU-T Y.1564 (2011), Ethernet service activation test methodology. ITU-T Y.1730 Recommendation ITU-T Y.1730 (2004), Requirements for OAM functions in Ethernet-based networks and Ethernet services. ITU-T Y.1731
47、Recommendation ITU-T Y.1731 (2006), OAM functions and mechanisms for Ethernet based networks. IEC 61588 IEC 61588 (2009), Precision clock synchronization protocol for networked measurement and control systems. IEEE 1588 IEEE 1588-2002, IEEE Standard for a Precision Clock Synchronization Protocol for
48、 Networked Measurement and Control Systems. IEEE 802 IEEE 802-2014, IEEE Standard for Local and Metropolitan Area Networks: Overview and Architecture. IEEE 802.1Q IEEE 802.1Q-2014, IEEE Standard for Local and metropolitan area networks Bridges and Bridged Networks IEEE 802.3 IEEE 802.3-2012, IEEE St
49、andard for Ethernet. ISO 3166-1 ISO 3166-1 (2013), Codes for the representation of names of countries and their subdivisions Part 1: Country codes. MEF 10.3 MEF 10.3 (2013), Ethernet Services Attributes Phase 3. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 adaptation: ITU-T G.809. Rec. ITU-T G.8013/Y.1731 (08/2015) 3 3.1.
