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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.8121.1/Y.1381.1 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1 (11/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Packet over Transport aspects MPLS over Transport aspects SERI

2、ES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS, INTERNET OF THINGS AND SMART CITIES Internet protocol aspects Transport Characteristics of MPLS-TP equipment functional blocks supporting ITU-T G.8113.1/Y.1372.1 OAM mechanisms Corrigendum 1 Recommendati

3、on ITU-T G.8121.1/Y.1381.1 (2016) Corrigendum 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 CH

4、ARACTERISTICS 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 T

5、RANSMISSION 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 CHARA

6、CTERISTICS 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 ACC

7、ESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.8121.1/Y.1381.1 (2016)/Cor.1 (11/2016) i Recommendation ITU-T G.8121.1/Y.1381.1 Characteristics of MPLS-TP equipment functional blocks supporting ITU-T G.8113.1/Y.1372.1 OAM mechanisms Corr

8、igendum 1 Summary Recommendation ITU-T G.8121.1/Y.1381.1 specifies both the functional components and the methodology that should be used in order to specify multi-protocol label switching transport profile (MPLS-TP) layer network functionality of network elements based on the protocol neutral const

9、ructs defined in Recommendation ITU-T G.8121 and on the tools defined in Recommendation ITU-T G.8113.1/Y.1372.1. Corrigendum 1: Clarifies the configuration of MI_CC_Enable and MI_CVp_Enable Adds missing “OAM_Tool“ MIs for AIS and LCK at MT_TT_Sk History Edition Recommendation Approval Study Group Un

10、ique ID* 1.0 ITU-T G.8121.1/Y.1381.1 2013-11-06 15 11.1002/1000/12019 2.0 ITU-T G.8121.1/Y.1381.1 2016-04-13 15 11.1002/1000/12805 2.1 ITU-T G.8121.1/Y.1381.1 (2016) Cor. 1 2016-11-13 15 11.1002/1000/13101 Keywords Atomic functions, equipment functional blocks, MPLS-TP layer network, MPLS-TP, OAM, P

11、TN. * 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.8121.1/Y.1381.1 (2016)/Cor.1 (11/2016) FOREWORD The International Telec

12、ommunication 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 responsible for studying technical, operating and ta

13、riff 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 the ITU-T study groups which, in turn, produce Recom

14、mendations 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 collaborative basis with ISO and IEC. NOTE In this Recomme

15、ndation, 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 certain mandatory provisions (to ensure, e.g., interoperab

16、ility 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 requirements. The use of such words does not suggest that com

17、pliance with the 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, validit

18、y 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 property, protected by patents, which may be require

19、d 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 2017 All rights reserved. No part of this publication may be reproduced,

20、 by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.8121.1/Y.1381.1 (2016)/Cor.1 (11/2016) 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 Recommendation . 3 4 Abbreviations and acronyms 3

21、 5 Conventions 4 6 Supervision . 5 6.1 Defects 5 6.2 Consequent actions . 5 6.3 Defect correlations 5 6.4 Performance filters . 5 7 Information flow across reference points . 5 8 MPLS-TP processes 5 8.1 G-ACh Process . 5 8.2 TC/Label processes 5 8.3 Queuing process . 5 8.4 MPLS-TP-specific GFP-F pro

22、cesses 5 8.5 Control word (CW) processes 5 8.6 OAM related Processes used by Server adaptation functions 5 8.7 OAM related Processes used by adaptation functions . 9 8.8 Proactive and on-demand OAM related Processes 9 9 MPLS-TP processes 56 9.1 Connection Functions (MT_C) . 56 9.2 Termination functi

23、ons 56 9.3 Adaptation functions 67 9.4 MT Diagnostic Function . 68 10 MPLS-TP to Non-MPLS-TP client adaptation functions . 78 11 Non-MPLS-TP Server to MPLS-TP adaptation functions . 78 Appendix I Counting OAM Packets . 79 Appendix II SDL descriptions 80 Bibliography. 81 Rec. ITU-T G.8121.1/Y.1381.1

24、(2016)/Cor.1 (11/2016) 1 Recommendation ITU-T G.8121.1/Y.1381.1 Characteristics of MPLS-TP equipment functional blocks supporting ITU-T G.8113.1/Y.1372.1 OAM mechanisms Corrigendum 1 Editorial note: This is a complete-text publication. Modifications introduced by this corrigendum are shown in revisi

25、on marks relative to Recommendation ITU-T G.8121.1/Y.1381.1 (2016). 1 Scope This Recommendation describes both the functional components and the methodology that should be used in order to describe multi-protocol label switching transport profile (MPLS-TP) layer network functionality of network elem

26、ents; it does not describe individual MPLS-TP network equipment as such. This Recommendation provides protocol-specific extensions of the protocol-neutral constructs defined in ITU-T G.8121 to support the operation, administration and maintenance (OAM) tools defined in ITU-T G.8113.1. This Recommend

27、ation provides a description of the MPLS-TP functional technology using the same methodologies that have been used for other transport technologies e.g., synchronous digital hierarchy (SDH), optical transport network (OTN) and Ethernet. This Recommendation forms part of a suite of Recommendations co

28、vering the full functionality of network equipment. In addition to this Recommendation, these Recommendations are ITU-T G.806, ITU-T G.8121, ITU-T G.798, ITU-T G.783, ITU-T G.705 and ITU-T G.8021. This Recommendation also follows the principles defined in ITU-T G.805. These Recommendations specify a

29、 library of basic building blocks and a set of rules by which they may be combined in order to describe digital transmission equipment. The library comprises the functional building blocks needed to specify completely the generic functional structure of the MPLS-TP layer network. In order to be comp

30、liant with this Recommendation, equipment needs to be describable as an interconnection of a subset of these functional blocks contained within this Recommendation. The interconnections of these blocks should obey the combination rules given. Not every atomic function defined in this Recommendation

31、is required for every application. Different subsets of atomic functions may be assembled in different ways according to the combination rules given in this Recommendation to provide a variety of different capabilities. Network operators and equipment suppliers may choose which functions must be imp

32、lemented for each application. 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 Recommendations and other re

33、ferences 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 regularly published. The referen

34、ce to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.705 Recommendation ITU-T G.705 (2000), Characteristics of plesiochronous digital hierarchy (PDH) equipment functional blocks. 2 Rec. ITU-T G.8121.1/Y.1381.1 (2016)/Cor.1 (

35、11/2016) ITU-T G.783 Recommendation ITU-T G.783 (2006), Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks. ITU-T G.798 Recommendation ITU-T G.798 (2012), Characteristics of optical transport network hierarchy equipment functional blocks. ITU-T G.805 Recommendation IT

36、U-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.8021 Recommendation ITU-T G.8021/Y.1341 (2015), Characteristics of Ethernet transp

37、ort network equipment functional blocks. ITU-T G.8101 Recommendation ITU-T G.8101/Y.1355 (2015), Terms and definitions for MPLS transport profile. ITU-T G.8113.1 Recommendation ITU-T G.8113.1/Y.1372.1 (2016), Operations, administration and maintenance mechanisms for MPLS-TP in packet transport netwo

38、rks. ITU-T G.8121 Recommendation ITU-T G.8121/Y.1381 (2016), Characteristics of MPLS-TP equipment functional blocks. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 access point ITU-T G.805. 3.1.2 adapted information ITU-T G.805. 3.1.3

39、associated channel header ITU-T G.8101. 3.1.4 bottom of stack ITU-T G.8101. 3.1.5 characteristic information ITU-T G.805. 3.1.6 client/server relationship ITU-T G.805. 3.1.7 connection ITU-T G.805. 3.1.8 connection point ITU-T G.805. 3.1.9 G-ACh label ITU-T G.8101. 3.1.10 generic associated channel

40、ITU-T G.8101. 3.1.11 label ITU-T G.8101. 3.1.12 label stack ITU-T G.8101. 3.1.13 label switched path ITU-T G.8101. 3.1.14 label value ITU-T G.8101. 3.1.15 layer network ITU-T G.805. 3.1.16 MPLS label stack ITU-T G.8101. 3.1.17 network ITU-T G.805. 3.1.18 network connection ITU-T G.805. Rec. ITU-T G.

41、8121.1/Y.1381.1 (2016)/Cor.1 (11/2016) 3 3.1.19 per-hop behaviour ITU-T G.8101. 3.1.20 reference point ITU-T G.805. 3.1.21 subnetwork ITU-T G.805. 3.1.22 subnetwork connection ITU-T G.805. 3.1.23 termination connection point ITU-T G.805. 3.1.24 time to live ITU-T G.8101. 3.1.25 traffic class ITU-T G

42、.8101. 3.1.26 trail ITU-T G.805. 3.1.27 trail termination ITU-T G.805. 3.1.28 transport ITU-T G.805. 3.1.29 transport entity ITU-T G.805. 3.2 Terms defined in this Recommendation None. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AI Adapted Informat

43、ion AIS Alarm Indication Signal AP Access Point APS Automatic Protection Switching CC Continuity Check CC/CV Continuity Check and Connectivity Verification CCM Continuity Check Message CI Characteristic Information CoS Class of Service CP Connection Point CSF Client Signal Fail CV Connectivity Verif

44、ication CW Control Word DM Delay Measurement DP Drop Precedence G-ACh Generic Associated Channel GAL G-ACh Label GFP-F Frame-mapped Generic Framing Procedure LBM Loopback Message LBR Loopback Reply LCK Locked 4 Rec. ITU-T G.8121.1/Y.1381.1 (2016)/Cor.1 (11/2016) LM Loss Measurement LMM Loss Measurem

45、ent Message LMR Loss Measurement Reply LStack Label Stack MCC Maintenance Communication Channel MEG Maintenance Entity Group (New) MEP Maintenance entity group (MEG) End Point MIP Maintenance entity group (MEG) Intermediate Point MP Management Point MPLS-TP Multi-Protocol Label Switching Transport P

46、rofile MT Multi-Protocol Label Switching Transport Profile MTDe MPLS-TP MEP Diagnostic function MTDi MPLS-TP MIP Diagnostic function OAM Operation, Administration and Maintenance OTN Optical Transport Network PDU Protocol Data Unit PHB Per-Hop Behaviour PM Performance Monitoring PSC PHB Scheduling C

47、lass RDI Remote Detect Indication RI Remote Information RP Remote Point RT Route Tracing SCC Signalling Communication Channel SDH Synchronous Digital Hierarchy SSF Server Signal Fail TCP Termination Connection Point TH Throughput TLV Type-Length-Value TSD Trail Signal Degrade TSF Trail Signal Fail T

48、TL Time-To-Live 5 Conventions The diagrammatic convention for connection-oriented layer networks described in this Recommendation is that of ITU-T G.805. In this Recommendation, MI_LMC_Enable and MI_LML_Enable are used to mean MI_1LMp_Enable and MI_LMp_Enable as described in ITU-T G.8121. Rec. ITU-T

49、 G.8121.1/Y.1381.1 (2016)/Cor.1 (11/2016) 5 6 Supervision The generic supervision functions are defined in clause 6 of ITU-T G.806. Protocol neutral supervision functions for the MPLS-TP network are defined in clause 6 of ITU-T G.8121. Specific supervision functions for the MPLS-TP network are defined in this clause. 6.1 Defects The defect Entry and Exit conditions are based on events. Occurrence or absence of specific e