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.8113.2/Y.1372.2 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1 (08/2017) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Packet over Transport aspects MPLS over Transport aspects SERIES
2、 Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS, NEXT-GENERATION NETWORKS, INTERNET OF THINGS AND SMART CITIES Internet protocol aspects Transport Operations, administration and maintenance mechanisms for MPLS-TP networks using the tools defined for MPLS Amendment 1 Recommendation I
3、TU-T G.8113.2/Y.1372.2 (2015) Amendment 1 ITU-T G-SERIES 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 CHARACTE
4、RISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON 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 TRANSMI
5、SSION 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.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERIS
6、TICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS 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 NE
7、TWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.8113.2/Y.1372.2 (2015)/Amd.1 (08/2017) i Recommendation ITU-T G.8113.2/Y.1372.2 Operations, administration and maintenance mechanisms for MPLS-TP networks using the tools defined for MPLS Amendme
8、nt 1 Summary Recommendation ITU-T G.8113.2/Y.1372.2 specifies operations, administration and maintenance (OAM) mechanisms based on the tools defined for multi-protocol label switching (MPLS) for data-plane OAM in MPLS transport profile (MPLS-TP) networks. It also specifies the MPLS-TP OAM packet for
9、mats, syntax and semantics of MPLS-TP OAM packet fields. The OAM mechanisms defined in this Recommendation assume common forwarding of the MPLS-TP user packets and MPLS-TP OAM packets. Amendment 1 adds material related to client signal fail handling. History Edition Recommendation Approval Study Gro
10、up Unique ID* 1.0 ITU-T G.8113.2/Y.1372.2 2012-11-20 15 11.1002/1000/11402 1.1 ITU-T G.8113.2/Y.1372.2 (2012) Amd.1 2013-08-29 15 11.1002/1000/12021 2.0 ITU-T G.8113.2/Y.1372.2 2015-08-13 15 11.1002/1000/12546 2.1 ITU-T G.8113.2/Y.1372.2 (2015) Amd. 1 2017-08-13 15 11.1002/1000/13316 _ * To access t
11、he 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.8113.2/Y.1372.2 (2015)/Amd.1 (08/2017) FOREWORD The International Telecommunication Unio
12、n (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 an
13、d 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 the
14、se 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 expr
15、ession “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 applicab
16、ility) 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
17、Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU 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
18、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
19、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 2017 All rights reserved. No part of this publication may be reproduced, by any means wha
20、tsoever, without the prior written permission of ITU. Rec. ITU-T G.8113.2/Y.1372.2 (2015)/Amd.1 (08/2017) 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 3 5 Conventions 5
21、6 Functional components . 5 6.1 Maintenance entity (ME) 5 6.2 Maintenance entity group (MEG) 5 6.3 MEG end points (MEPs) 5 6.4 MEG intermediate points (MIPs) . 7 7 OAM functions . 9 7.1 Identification of OAM packets from user-traffic packets 9 7.2 OAM functions specification . 9 8 OAM protocol data
22、unit (PDU) formats . 14 8.1 Continuity check and connectivity verification 14 8.2 Transport plane loopback formats 14 8.3 Alarm indication signal (AIS) and link down indication (LDI) formats 14 8.4 Lock instruct (LI) and lock report (LKR) formats . 14 8.5 Test (TST) formats . 14 8.6 Loss measurement
23、 message/loss measurement reply (LMM/LMR) formats 15 8.7 One-way delay measurement (1DM) formats 15 8.8 Two-way delay measurement message/delay measurement reply (DMM/DMR) formats 15 8.9 Client signal fail (CSF) formats . 15 8.10 Experimental message/experimental reply (EXM/EXR) formats 15 8.11 Mana
24、gement communication channel and signalling communication channel formats 15 9 MPLS-TP OAM procedures . 15 9.1 Continuity check and connectivity verification 15 9.2 Transport plane loopback procedures . 15 9.3 Alarm indication signal (AIS) and link down indication (LDI) procedures 16 9.4 Lock indica
25、tion (LI) and lock report (LKR) procedures 16 9.5 Test (TST) procedures 16 iv Rec. ITU-T G.8113.2/Y.1372.2 (2015)/Amd.1 (08/2017) Page 9.6 Loss measurement message/loss measurement reply (LMM/LMR) procedures . 16 9.7 One-way delay measurement (1DM) procedures . 16 9.8 Two-way delay measurement messa
26、ge/delay measurement reply (DMM/DMR) procedures . 16 9.9 Client signal fail (CSF) procedures 16 10 Security . 16 Appendix I MPLS-TP network scenarios . 18 I.1 Maintenance entity group (MEG) nesting example . 18 Appendix II Requirements traceability . 19 Bibliography. 22 Rec. ITU-T G.8113.2/Y.1372.2
27、(2015)/Amd.1 (08/2017) 1 Recommendation ITU-T G.8113.2/Y.1372.2 Operations, administration and maintenance mechanisms for MPLS-TP networks using the tools defined for MPLS Amendment 1 Editorial note: This is a complete-text publication. Modifications introduced by this amendment are shown in revisio
28、n marks relative to Recommendation ITU-T G.8113.2/Y.1372.2 (2015). 1 Scope This Recommendation specifies operations, administration and maintenance (OAM) mechanisms based on the tools defined for multi-protocol label switching (MPLS) in IETF Requests for Comments, for data-plane OAM in MPLS transpor
29、t profile (MPLS-TP) networks to meet the MPLS-TP OAM requirements defined in IETF RFC 5860. It also specifies the MPLS-TP OAM packet formats, syntax and semantics of MPLS-TP OAM packet fields. The OAM mechanisms defined in this Recommendation assume common forwarding of the MPLS-TP user packets and
30、MPLS-TP OAM packets. In transport networks using co-routed bidirectional point-to-point connections, the OAM return path is always in-band. This Recommendation provides a representation of the MPLS-TP technology using the methodologies that have been used for other transport technologies e.g., synch
31、ronous digital hierarchy (SDH), optical transport network (OTN) and Ethernet.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 indica
32、ted 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 currently valid ITU-T Rec
33、ommendations 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 functional architecture of transport networks. ITU-T G.7712 Recommendation I
34、TU-T G.7712/Y.1703 (2010), Architecture and specification of data communication network. ITU-T G.8010 Recommendation ITU-T G.8010/Y.1306 (2004), Architecture of Ethernet layer networks, plus Amendment 1 (2006) and Amendment 2 (2010). ITU-T G.8110.1 Recommendation ITU-T G.8110.1/Y.1370.1 (2011), Arch
35、itecture of Multi-Protocol Label Switching transport profile layer network. _ 1 This ITU-T Recommendation is intended to be aligned with the IETF RFCs applicable to MPLS normatively referenced by this Recommendation. 2 Rec. ITU-T G.8113.2/Y.1372.2 (2015)/Amd.1 (08/2017) ITU-T G.8121.2 Recommendation
36、 ITU-T G.8121.2/Y.1381.2 (2013), Characteristics of MPLS-TP equipment functional blocks supporting ITU-T G.8113.2/Y.1372.2 OAM mechanisms. IETF RFC 3692 IETF RFC 3692 (2004), Assigning Experimental and Testing Numbers Considered Useful. IETF RFC 4379 IETF RFC 4379 (2006), Detecting Multi-Protocol La
37、bel Switched (MPLS) Data Plane Failures. IETF RFC 4446 IETF RFC 4446 (2006), IANA Allocations for Pseudowire Edge to Edge Emulation (PWE3). IETF RFC 5226 IETF RFC 5226 (2008), Guidelines for Writing an IANA Considerations Section in RFCs. IETF RFC 5586 IETF RFC 5586 (2009), MPLS Generic Associated C
38、hannel. IETF RFC 5654 IETF RFC 5654 (2009), Requirements of an MPLS Transport Profile. 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) in M
39、PLS Transport Networks. IETF RFC 5881 IETF RFC 5881 (2010), Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop). IETF RFC 5884 IETF RFC 5884 (2010), Bidirectional Forwarding Detection (BFD) for MPLS Label Switched Paths (LSPs). IETF RFC 5921 IETF RFC 5921 (2010), A Framework for
40、MPLS in Transport Networks. IETF RFC 6370 IETF RFC 6370 (2011), MPLS Transport Profile (MPLS-TP) Identifiers. IETF RFC 6371 IETF RFC 6371 (2011), Operations, Administration, and Maintenance Framework for MPLS-based Transport Networks. IETF RFC 6374 IETF RFC 6374 (2011), Packet Loss and Delay Measure
41、ment for MPLS Networks. IETF RFC 6375 IETF RFC 6375 (2011), A Packet Loss and Delay Measurement Profile for MPLS-based Transport Networks. IETF RFC 6423 IETF RFC 6423 (2011), Using the Generic Associated Channel Label for Pseudowire in the MPLS Transport Profile (MPLS-TP). IETF RFC 6426 IETF RFC 642
42、6 (2011), MPLS On-Demand Connectivity Verification and Route Tracing. IETF RFC 6427 IETF RFC 6427 (2011), MPLS Fault Management Operations, Administration, and Maintenance (OAM). IETF RFC 6428 IETF RFC 6428 (2011), Proactive Connectivity Verification, Continuity Check and Remote Defect Indication fo
43、r the MPLS Transport Profile. IETF RFC 6435 IETF RFC 6435 (2011), MPLS Transport Profile Lock Instruct and Loopback Functions. IETF RFC 6478 IETF RFC 6478 (2012), Pseudowire Status for Static Pseudowires. IETF RFC 6923 IETF RFC 6923 (2013), MPLS Transport Protocol (MPLS-TP) Identifiers Following ITU
44、-T Conventions. Rec. ITU-T G.8113.2/Y.1372.2 (2015)/Amd.1 (08/2017) 3 3 Definitions This Recommendation introduces some terminology which 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 els
45、ewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 defect b-ITU-T G.806: The density of anomalies has reached a level where the ability to perform a required function has been interrupted. Defects are used as input for performance monitoring, the control of consequent actio
46、ns and for the determination of fault causes. 3.1.2 failure b-ITU-T G.806: The fault cause persisted long enough to consider the ability of an item to perform a required function to be terminated. The item may be considered as failed; a fault has now been detected. 3.1.3 MPLS transport profile b-ITU
47、-T G.8113.1: A set of multi-protocol label switching (MPLS) functions used to support packet transport services and network operations. 3.2 Terms defined in this Recommendation None. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: 1DM One-way Delay Mea
48、surement ACH Associated Channel Header AIS Alarm Indication Signal BFD Bidirectional Forwarding Detection C Customer CC Continuity Check CP Connection Point CSF Client Signal Fail CV Connectivity Verification DM Delay Measurement DMM Delay Measurement Message DMR Delay Measurement Reply EXM Experime
49、ntal OAM Message EXR Experimental OAM Reply FFS For Further Study G-ACh Generic Associated Channel GAL G-ACh Label ICC ITU Carrier Code ID Identifier 4 Rec. ITU-T G.8113.2/Y.1372.2 (2015)/Amd.1 (08/2017) IP Internet Protocol LCK Locked Signal LDI Link Down Indication LER Label Edge Router LI Lock Instruct LKR Lock Report LM Loss Measurement LMM Loss Measurement Message LMR Loss Measurement Reply LOC Loss Of Continuity LSP Label-Swi
