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.8113.1/Y.1372.1 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (04/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Packet over Transport aspects MPLS over Transport aspects SERIES Y: GLOBAL I
2、NFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS, INTERNET OF THINGS AND SMART CITIES Internet protocol aspects Transport Operations, administration and maintenance mechanisms for MPLS-TP in packet transport networks Recommendation ITU-T G.8113.1/Y.1372.1 ITU-T G-SER
3、IES 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
4、 METALLIC 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.600
5、G.699 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
6、 G.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
7、 to the list of ITU-T Recommendations. Rec. ITU-T G.8113.1/Y.1372.1 (04/2016) i Recommendation ITU-T G.8113.1/Y.1372.1 Operations, administration and maintenance mechanisms for MPLS-TP in packet transport networks Summary Recommendation ITU-T G.8113.1/Y.1372.1 specifies mechanisms for user-plane ope
8、rations, administration and maintenance (OAM) in multi-protocol label switching transport profile (MPLS-TP) networks to meet the MPLS-TP OAM requirements specified in IETF RFC 5860. It also specifies the MPLS-TP OAM packet formats, syntax and semantics of MPLS-TP OAM packet fields. The OAM mechanism
9、s described in this Recommendation assume common forwarding of the MPLS-TP user packets and MPLS-TP OAM packets. In transport networks, the OAM return path is always in-band. The MPLS-TP OAM mechanisms described in this Recommendation apply to co-routed bidirectional point-to-point MPLS-TP connectio
10、ns. Unidirectional point-to-point and point-to-multipoint MPLS-TP connections will be addressed in a future edition of this Recommendation. This Recommendation is compliant with the transport profile of MPLS as specified by the Internet Engineering Task Force b-IETF RFC 5654. In the event of a misal
11、ignment in MPLS-TP-related architecture, framework and protocols between this ITU-T Recommendation and the normatively referenced IETF RFCs, the requests for comments (RFCs) will take precedence. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.8113.1/Y.1372.1 2012-11-20 15
12、 11.1002/1000/11323 1.1 ITU-T G.8113.1/Y.1372.1 (2012) Amd.1 2013-08-29 15 11.1002/1000/12032 2.0 ITU-T G.8113.1/Y.1372.1 2016-04-13 15 11.1002/1000/12803 Keywords MPLS-TP, OAM, PTN. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed
13、 by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.8113.1/Y.1372.1 (04/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication te
14、chnologies (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 telecommunications on a worldwide basis. The World Tel
15、ecommunication 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 the procedure laid down in WTSA Resolution 1. In some
16、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 both a telecommunication administration and a recognized
17、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 all of these mandatory provisions are met. The words “
18、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 RIGHTSITU draws attention to the possibility that the
19、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 by ITU members or others outside of the Recommendation de
20、velopment 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 this may not represent the latest information and are the
21、refore strongly urged to consult the TSB patent database 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.8113.1/Y.1372.1 (04/2016) iii Table of Contents Pa
22、ge 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 3 4 Abbreviations and acronyms 3 5 Conventions 5 6 Functional components . 5 6.1 Maintenance entity . 5 6.2 Maintenance entity group . 5 6.3 Maintenance entity group end points .
23、6 6.4 Maintenance entity group intermediate points . 7 6.5 Server MEP 10 7 OAM functions . 10 7.1 Identification of OAM packets from user-traffic packets 10 7.2 OAM functions specification . 11 8 OAM packet formats 15 8.1 Common OAM packets 15 8.2 OAM PDU formats based on ITU-T G.8013 16 8.3 Managem
24、ent communication channel 24 8.4 Signalling communication channel 24 9 MPLS-TP OAM procedures . 24 9.1 MPLS-TP OAM procedures based on ITU-T G.8013 PDUs . 24 10 Security . 33 Annex A MPLS-TP OAM for a packet transport network applicability statement . 34 Appendix I MPLS-TP network scenarios . 35 I.1
25、 MEG nesting example 35 Bibliography. 36 Rec. ITU-T G.8113.1/Y.1372.1 (04/2016) 1 Recommendation ITU-T G.8113.1/Y.1372.1 Operations, administration and maintenance mechanisms for MPLS-TP in packet transport networks 1 Scope This Recommendation specifies mechanisms for operations, administration and
26、maintenance (OAM) for multi-protocol label switching transport profiles (MPLS-TPs) that can be applied in packet transport networks (PTN). It specifies mechanisms for user-plane OAM in MPLS-TP networks to meet the MPLS-TP OAM requirements specified in IETF RFC 5860. It also specifies the MPLS-TP OAM
27、 packet formats, syntax and semantics of MPLS-TP OAM packet fields. The OAM mechanisms described in this Recommendation assume common forwarding of the MPLS-TP user packets and MPLS-TP OAM packets. In transport networks, the OAM return path is always in-band. The MPLS-TP OAM mechanisms described in
28、this Recommendation are applicable in network scenarios, as described in Annex A, and apply to co-routed bidirectional point-to-point MPLS-TP connections. Unidirectional point-to-point and point-to-multipoint MPLS-TP connections will be addressed in a future edition of this Recommendation. This Reco
29、mmendation provides a representation of the MPLS-TP technology using the methodologies that have been used for other transport technologies e.g., synchronous digital hierarchy (SDH), optical transport network (OTN) and Ethernet.1 2 References The following ITU-T Recommendations and other references
30、contain provisions which, through reference in this text, 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 investigat
31、e 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 regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status o
32、f a Recommendation. ITU-T G.805 Recommendation ITU-T G.805 (2000), Generic 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.808.1 Recommendation ITU-T G.808.
33、1 (2014) Generic protection switching Linear trail and subnetwork protection. ITU-T G.826 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 (201
34、2), Common equipment management function requirements. 1 This Recommendation is intended to be aligned with the IETF RFCs on MPLS referenced normatively by this Recommendation. 2 Rec. ITU-T G.8113.1/Y.1372.1 (04/2016) ITU-T G.7712 Recommendation ITU-T G.7712/Y.1703 (2010), Architecture and specifica
35、tion of data communication network. ITU-T G.8010 Recommendation ITU-T G.8010/Y.1306 (2004), Architecture of Ethernet layer networks. ITU-T G.8013 Recommendation ITU-T G.8013/Y.1731 (2015), Operations, administration and maintenance (OAM) functions and mechanisms for Ethernet-based networks. ITU-T G.
36、8021 Recommendation ITU-T G.8021/Y.1341 (2015), Characteristics of Ethernet transport network equipment functional blocks. ITU-T G.8110.1 Recommendation ITU-T G.8110.1/Y.1370.1 (2011), Architecture of Multi-Protocol Label Switching transport profile layer network. ITU-T M.1400 Recommendation ITU-T M
37、.1400 (2015), Designations for interconnections among operators networks. IEC 61588 IEC 61588 (2009), Precision clock synchronization protocol for networked measurement and control systems. IETF RFC 3032 IETF RFC 3032 (2001), MPLS Label Stack Encoding. IETF RFC 3443 IETF RFC 3443 (2003), Time To Liv
38、e (TTL) Processing in Multi-Protocol Label Switching (MPLS) Networks. IETF RFC 4385 IETF RFC 4385 (2006), Pseudowire Emulation Edge-to-Edge (PWE3) Control Word for Use over an MPLS PSN. IETF RFC 5462 IETF RFC 5462 (2009), Multiprotocol Label Switching (MPLS) Label Stack Entry: “EXP“ Field Renamed to
39、 “Traffic Class“ Field. IETF RFC 5586 IETF RFC 5586 (2009), MPLS Generic Associated Channel. IETF RFC 5718 IETF RFC 5718 (2010), An In-Band Data Communication Network For the MPLS Transport Profile. IETF RFC 5860 IETF RFC 5860 (2010), Requirements for Operations, Administration, and Maintenance (OAM
40、) in MPLS Transport Networks. IETF RFC 6371 IETF RFC 6371 (2011), Operations, Administration and Maintenance Framework for MPLS-Based Transport Networks. ISO 3166-1 ISO 3166-1 (2013), Codes for the representation of names of countries and their subdivisions Part 1: Country codes. 3 Definitions This
41、Recommendation introduces terminology that is required to discuss the functional network components associated with OAM. These definitions are consistent with ITU-T G.805 terminology. 3.1 Terms defined elsewhere This Recommendation uses the following terms defined in ITU-T G.806: defect failure Rec.
42、 ITU-T G.8113.1/Y.1372.1 (04/2016) 3 3.2 Terms defined in this Recommendation This Recommendation defines the following term: 3.2.1 MPLS transport profile: A set of multi-protocol label switching (MPLS) functions used to support packet transport services and network operations. 4 Abbreviations and a
43、cronyms This Recommendation uses the following abbreviations and acronyms: 1DM one-way Delay Measurement ACH Associated Channel Header AIS Alarm Indication Signal AP Access Point APS Automatic Protection Switching CC Continuity Check; Country Code CCM Continuity Check Message C-DCI Client Defect Cle
44、ar Indication CFI Client Failure Indication CSF Client Signal Fail CV Connectivity Verification DCC Data Communication Channel DM Delay Measurement DMM Delay Measurement Message DMR Delay Measurement Reply DT Diagnostic Test EXM Experimental OAM Message EXP Experimental EXR Experimental OAM Reply FC
45、 Frame Count G-ACh Generic Associated Channel GAL G-ACh Label ICC ITU-T Carrier Code ID Identifier IF Interface LBM Loopback Message LBR Loopback Reply LCK Locked Signal LM Loss Measurement LMM Loss Measurement Message 4 Rec. ITU-T G.8113.1/Y.1372.1 (04/2016) LMR Loss Measurement Reply LOC Loss Of C
46、ontinuity LSE Label Stack Entry LSP Label Switched Path LSR Label Switch Router MCC Management Communication Channel ME Maintenance Entity MEG Maintenance Entity Group MEL MEG Level MEP MEG End Point MIP MEG Intermediate Point MMG Mismerge MPLS Multi-Protocol Label Switching MPLS-TP MPLS Transport P
47、rofile NE Network Element Num Number OAM Operations, Administration and Maintenance OpCode Operations Code OSS Operations Support System OTN Optical Transport Network PD Packet Delay PDU Protocol Data Unit PDV Packet Delay Variation PHB Per-Hop Behaviour PRBS Pseudo-Random Bit Sequence PTN Packet Tr
48、ansport Network PW Pseudowire RDI Remote Defect Indication RT Route Tracing Rx Receive SCC Signalling Communication Channel SDH Synchronous Digital Hierarchy SES Severely Errored Second Sk Sink SLA Service Level Agreement So Source SPME Sub-Path Maintenance Entity Rec. ITU-T G.8113.1/Y.1372.1 (04/20
49、16) 5 TC Traffic Class TCM Tandem Connection Monitoring TLV Type, Length and Value TrCP Traffic Conditioning Point TST Test TTL Time To Live Tx Transmit UNI User Network Interface UNL Unexpected MEL UNM Unexpected MEP UNP Unexpected Periodicity UNPr Unexpected Priority VCCV Virtual Circuit Connectivity Verification VS Vendor-Specific VSM Vendor-Specific OAM Message VSR Vendor-Specific OAM Reply 5 Conventions The diagrammatic conventions for maintenance entity group (MEG) end po
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