1、 International Telecommunication Union ITU-T G.8010/Y.1306TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(05/2006) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Ethernet over Transport aspects General aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET
2、PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Architecture of Ethernet layer networks Amendment 1 ITU-T Recommendation G.8010/Y.1306 (2004) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPH
3、ONE 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 METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADI
4、O-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.
5、999 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 ETHERNET OVER TRANSPORT ASPECTS G.8000G.8999 General aspects G.8000G.8099 MPLS over Transport aspects G.8100G.8199 Qua
6、lity and availability targets G.8200G.8299 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.8010/Y.1306 (2004)/Amd.1 (05/2006) i ITU-T Recommendation G.8010/Y.1306 Architecture of Ethernet layer networks Amendment 1 Summary This amendm
7、ent contains additional material to be incorporated into ITU-T Recommendation G.8010/Y.1306. It presents the architectural aspects of Ethernet OAM. Source Amendment 1 to ITU-T Recommendation G.8010/Y.1306 (2004) was approved on 22 May 2006 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommen
8、dation A.8 procedure. ii ITU-T Rec. G.8010/Y.1306 (2004)/Amd.1 (05/2006) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T i
9、s 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), which meets every four years, establishes the topics for study b
10、y 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 within ITU-Ts purview, the necessary standards are prepared on a coll
11、aborative 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 Recommendation is voluntary. However, the Recommendation may contain cert
12、ain 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 as “must“ and the negative equivalents are used to express requireme
13、nts. The use of such words does not suggest that compliance with the Recommendation 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. I
14、TU 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 of this Recommendation, ITU had not received notice of intellectual
15、 property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2007 All rights reserved. No part of this publicati
16、on may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.8010/Y.1306 (2004)/Amd.1 (05/2006) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Conventions 1 4 Changes to ITU-T Rec. G.8010/Y.1306. 1 4.1 Clause 1, Scope 1 4.2 Clause 2, References 1 4.3 Clause
17、 3, Definitions 2 4.4 Clause 4, Abbreviations 2 4.5 Clause 5, Conventions 3 4.6 Clause 6, Functional architecture of Ethernet transport networks . 5 4.7 Additions to Clause 7, Ethernet network management 8 4.8 Additions to subclause 7.1, Ethernet maintenance entities 8 4.9 Additions to subclause 7.2
18、, Ethernet maintenance entity supervision techniques. 10 4.10 Additions to subclause 7.3, Ethernet layer network management requirements . 19 4.11 Additions to subclause 7.4, Ethernet layer network traffic management. 19 4.12 New clause 7.5, ETH transport processing functions. 20 4.13 Add new Append
19、ix IV 26 4.14 Add new Appendix V. 31 4.15 Add new Appendix VI 35 4.16 Add new Appendix VII 37 ITU-T Rec. G.8010/Y.1306 (2004)/Amd.1 (05/2006) 1 ITU-T Recommendation G.8010/Y.1306 Architecture of Ethernet layer networks Amendment 1 1 Scope This amendment provides updated material pertaining to the ar
20、chitecture of the Architecture for Ethernet Layer Networks as described in ITU-T Rec. G.8010/Y.1306. It presents the architectural aspects of Ethernet OAM. 2 References ITU-T Recommendation G.8010/Y.1306 (2004), Architecture for Ethernet layer networks. 3 Conventions This amendment contains changes
21、to ITU-T Rec. G.8010/Y.1306. Some of this material is new material, while some represents modifications to existing material in the original Recommendation. 4 Changes to ITU-T Rec. G.8010/Y.1306 The following clauses contain changes to be made to G.8010/Y.1306. 4.1 Clause 1, Scope Delete the last pa
22、ragraph in this clause. 4.2 Clause 2, References Add the following references: ITU-T Recommendation G.7710/Y.1701 (2001), Common equipment management function requirements. ITU-T Recommendation G.8001/Y.1354 (2006), Terms and definitions for Ethernet frames over Transport(EoT). ITU-T Recommendation
23、G.8011/Y.1307 (2004), Ethernet over Transport Ethernet services framework. ITU-T Recommendation G.8021/Y.1341 (2004), Characteristics of Ethernet transport network equipment functional blocks. ITU-T Recommendation X.731 (1992), Information technology Open Systems Interconnection Systems management:
24、State management function. ITU-T Recommendation Y.1731 (2006), OAM functions and mechanisms for Ethernet based networks. 2 ITU-T Rec. G.8010/Y.1306 (2004)/Amd.1 (05/2006) 4.3 Clause 3, Definitions Add the following definitions: 3.3.2 maintenance entity group: A maintenance entity group is defined, f
25、or the purpose of fragment/connection monitoring, between a set of flow/connection points within a fragment/connection. This set of flow/connection points may be located at the boundary of one administrative domain or a protection domain, or at the boundaries of two adjacent administrative domains.
26、The maintenance entity group consists of one or more maintenance entities. 3.3.3 maintenance entity: The entity between two of the flow/connection points in a maintenance entity group. 3.3.4 maintenance entity group end point compound sink function: A compound transport processing function which acc
27、epts the characteristic information of the layer network at its input, extracts and processes the OAM information related to the maintenance entity groups monitoring, filters the OAM information from within to the maintenance entity group, adapts the information and presents it as the characteristic
28、 information of the layer or a client layer at its output, potentially as a (client) layer maintenance signal (e.g., AIS). 3.3.5 maintenance entity group end point compound source function: A compound transport processing function which accepts the characteristic information of the layer or a client
29、 layer network at its input, adapts that information, filters it for OAM information interfering with its own OAM information, adds OAM information to allow the maintenance entity group to be monitored and presents the resulting information at its output. 3.3.6 maintenance entity group intermediate
30、point compound function: A compound transport processing function which accepts the characteristic information of the layer network at its input, reacts to OAM information related to the maintenance entity groups on-demand monitoring and presents the characteristic information without the OAM it rea
31、cted to at its output. 3.3.7 proactive monitoring: A method to continuously infer the status and performance of a maintenance entity group with the purpose to detect disturbances, faults and degradations immediately after their occurrence in order to verify the service level agreement and/or initiat
32、e recovery actions to restore the service to the guaranteed level. 3.3.8 on-demand monitoring: A method to infer a specific status or performance characteristic of a maintenance entity or a set of maintenance entities within a maintenance entity group at a specific point in time with the purpose to
33、obtain a snapshot of the performance, or to diagnose an identified fault condition or performance degradation. 3.3.9 ETH_CI group: A group of ETH_CI signals that is monitored as a single MEG. For this purpose, ETH OAM is added to one of the ETH_CI signals in the group. 3.3.10 ETH path: The highest E
34、TH MEG level in a set of eight MEG levels. 3.3.11 ETH tandem connection: An intermediate ETH MEG level in a set of eight MEG levels. 3.3.12 ETH section: The lowest ETH MEG level in a set of eight MEG levels. 4.4 Clause 4, Abbreviations a) Modify the following abbreviation: ETH Ethernet MAC layer net
35、work b) Add the following new abbreviations alphabetically: 1DM One-way delay measurement AIS Alarm Indication Signal APS Automatic Protection Switching ITU-T Rec. G.8010/Y.1306 (2004)/Amd.1 (05/2006) 3 CCM Connectivity Check Message DA Destination MAC address DMM Delay Measurement Message DMR Delay
36、 Measurement Reply EC Ethernet Connection ETHDe ETH Diagnostic function within ETHx MEP ETHDi ETH Diagnostic function within ETHx MIP ETHG ETH Group ETHx ETH at level x (x = path, tandem connection, section) LBM Loopback Message LBR Loopback Reply LCK Locked LMM Loss Measurement Message LMR Loss Mea
37、surement Reply LTM Link Trace Message LTR Link Trace Reply MEG Maintenance Entity Group MEL Maintenance Entity Group Level MEP Maintenance entity group End Point MIP Maintenance entity group Intermediate Point PDU Protocol Data Unit SA Source MAC Address TCS Traffic Conditioning and Shaping TST Test
38、 PDU 4.5 Clause 5, Conventions a) Change the numbers of Figures 1 and 2 to 5-1 and 5-2. b) Change the number and the symbol of the unidirectional traffic conditioning function in Figure 3 to a traffic conditioning and shaping function as follows: The diagrammatic convention for a unidirectional traf
39、fic conditioning and shaping function is shown in Figure 5-3. The TCS sink function provides the traffic conditioning process. The TCS source function provides the shaping process. 4 ITU-T Rec. G.8010/Y.1306 (2004)/Amd.1 (05/2006) G.8010-Y.1306(04)AMD.1_F5-3G.8010-Y.1306_F03Unidirectional traffic co
40、nditioningTraffic conditioningand shapingTCS_Sinktraffic conditioningTCS_ SourceshapingFigure 5-3 Diagrammatic convention for unidirectional traffic conditioning and shaping function c) Add the following new conventions: The diagrammatic convention for a MEG end point (MEP) compound function is show
41、n in Figure 5-4. XFigure 5-4 Diagrammatic convention for MEG end point (MEP) compound function The diagrammatic convention for a MEG intermediate point (MIP) compound function is shown in Figure 5-5. XFigure 5-5 Diagrammatic convention for MEG intermediate point (MIP) compound function ITU-T Rec. G.
42、8010/Y.1306 (2004)/Amd.1 (05/2006) 5 4.6 Clause 6, Functional architecture of Ethernet transport networks a) Delete the word “MAC“ from the text in 6.2 and from the heading of 6.3. b) Modify the second and third paragraphs in 6.3.1 as follows: The ETH_CI traffic unit consists of the following set of
43、 signals: Destination Address (DA), Source Address (SA), MAC Service Data Unit (M_SDU) with optional Priority (P). The ETH_CI consists of the following set of signals: ETH_CI Data (D), ETH_CI Priority (P), ETH_CI Drop Eligibility (DE), ETH_CI Server Signal Fail (SSF) and optionally ETH_CI Automatic
44、Protection Switching (APS). The ETH_CI_D signal carries the traffic unit that consists of the following fields: Destination Address (DA), Source Address (SA) and MAC Service Data Unit (M_SDU). The ETH_CI traffic unit is transported over an ETH FPP Link within a link-specific frame or packet, of whic
45、h the generic format is depicted in Figure 5. The Priority and Drop Eligibility signals may be transported implicitly or explicitly. Refer to Appendix IV for further considerations on ETH_CI. c) Add the following new text at the end of clause 6.3.2.2 ETH flow domain: NOTE The description of split-ho
46、rizon functionality in an ETH flow domain is for further study. d) Delete in Figure 8 in clause 6.3.2.5.2 and in Figure 9 in clause 6.3.2.5.3 the second ETH_TFP input and output ports on the two top left ETH_FT_So/Sk functions. Each ETH_FT function can have only one ETH_TFP. e) Replace the text in c
47、lause 6.3.4.1 ETH flow termination function by a reference to clause 7.5.1. f) Modify the text in and title of clause 6.3.4.2 “ETH traffic conditioning function“ as follows: 6.3.4.2 ETH traffic conditioning and shaping function The bidirectional ETH traffic conditioning and shaping (ETH_TCS) functio
48、n is performed by a co-located pair of ETH traffic conditioning and shaping source (ETH_TCS_So) and sink (ETH_TCS_Sk) functions. The ETH_TCS_So function performs the following shaping processes: For further study. The ETH_TCS_Sk function performs the following traffic conditioning processes: Classif
49、ication: This process classifies each ETH_CI traffic unit. Metering: This process meters every ETH_CI traffic unit within its class in order to determine the eligibility of the ETH_CI traffic unit. Marking: This process and sets the ddrop precedence eligibility if applicable. Policing: This process disposes of the ETH_CI traffic unit according to the result from the metering process. There are only two dispositions for an ETH_CI traffic unit, passing to the ETH_FP or discarding. The ETH_TCS traffic conditioning function is a
