1、 International Telecommunication Union ITU-T G.8010/Y.1306TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2(07/2010) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Packet over Transport aspects Ethernet over Transport aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCT
2、URE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Architecture of Ethernet layer networks Amendment 2: Application of the ITU-T G.800 functional architecture to Ethernet transport and some editorial revisions Recommendation ITU-T G.8010/Y.1306 (2004) Ame
3、ndment 2 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 CHARACTERISTICS OF INTERNATIONAL CARRIER
4、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 TRANSMISSION MEDIA AND OPTICAL SYSTEMS C
5、HARACTERISTICS 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 CHARACTERISTICS G.6000G.6999 DATA OVER TRANS
6、PORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 Ethernet over Transport aspects G.8000G.8099MPLS over Transport aspects G.8100G.8199 Quality and availability targets G.8200G.8299 Service Management G.8600G.8699 ACCESS NETWORKS G.9000G.9999 For further details, please ref
7、er to the list of ITU-T Recommendations. Rec. ITU-T G.8010/Y.1306 (2004)/Amd.2 (07/2010) i Recommendation ITU-T G.8010/Y.1306 Architecture of Ethernet layer networks Amendment 2 Application of the ITU-T G.800 functional architecture to Ethernet transport and some editorial revisions Summary Amendmen
8、t 2 to Recommendation ITU-T G.8010/Y.1306 contains additional material to be incorporated into Recommendation ITU-T G.8010/Y.1306, Architecture of Ethernet layer networks. It presents the ITU-T G.800 model of Ethernet layer network architecture. History Edition Recommendation Approval Study Group 1.
9、0 ITU-T G.8010/Y.1306 2004-02-22 15 1.1 ITU-T G.8010/Y.1306 (2004) Amend. 1 2006-05-22 15 1.2 ITU-T G.8010/Y.1306 (2004) Amend. 2 2010-07-29 15 ii Rec. ITU-T G.8010/Y.1306 (2004)/Amd.2 (07/2010) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the
10、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 and issuing Recommendations on them with a view to standar
11、dizing 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 these topics. The approval of ITU-T Recommendations is cove
12、red 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 expression “Administration“ is used for conciseness to indic
13、ate 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 applicability) and compliance with the Recommendation is achieve
14、d 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 Recommendation is required of any party. INTELLECTUAL PR
15、OPERTY 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. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asse
16、rted 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 this Recommendation. However, implementers are cautioned
17、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 2011 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. R
18、ec. ITU-T G.8010/Y.1306 (2004)/Amd.2 (07/2010) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Conventions 1 4 Additions and modifications to ITU-T G.8010 1 4.1 Clause 2, References 1 4.2 Terms to be removed from ITU-T G.8010 2 4.3 Modifications to clauses 6.5.2.2.3 and 6.5.1.3 and Figure V.5 3 4.4 Ad
19、d new clause 9 4 4.5 Add new Appendix VIII . 25 4.6 Add new Appendix IX 28 4.7 Add new Appendix X . 30 4.8 Add new Appendix XI 33 4.9 Add new Appendix XII 35 4.10 Bibliography . 36 Rec. ITU-T G.8010/Y.1306 (2004)/Amd.2 (07/2010) 1 Recommendation ITU-T G.8010/Y.1306 Architecture of Ethernet layer net
20、works Amendment 2 Application of the ITU-T G.800 functional architecture to Ethernet transport and some editorial revisions 1 Scope This amendment provides updated material pertaining to the architecture of Ethernet layer networks, as described in ITU-T G.8010. It presents the ITU-T G.800 model of E
21、thernet layer network architecture including provider bridged network and provider backbone bridged network functional architecture. This material is new material to be added to the original Recommendation as amended by Amendment 1. 2 References ITU-T G.8010 Recommendation ITU-T G.8010/Y.1306 (2004)
22、, Architecture of Ethernet layer networks, plus Amendment 1 (2006). 3 Conventions None. 4 Additions and modifications to ITU-T G.8010 The following clauses contain additions and modifications to be made to ITU-T G.8010. 4.1 Clause 2, References Replace the reference to IEEE 802.1Q with the following
23、: IEEE Standard 802.1Q-2005, IEEE Standard for Local and metropolitan area networks: Virtual Bridged Local Area Networks. Add the following references: Recommendation ITU-T G.800 (2007), Unified functional architecture of transport networks. IEEE Standard 802.1ad-2005, IEEE Standard for Local and Me
24、tropolitan Area Networks: Virtual Bridged Local Area Networks, Amendment 4: Provider Bridges. IEEE Standard 802.1ah-2008, IEEE Standard for Local and Metropolitan Area Networks: Virtual Bridged Local Area Networks, Amendment 7: Provider Backbone Bridges. IEEE Standard 802.1Qaw-2009, IEEE Standard fo
25、r Local and Metropolitan Area Networks: Virtual Bridged Local Area Networks, Amendment 9: Management of Data Driven and Data Dependent Connectivity Faults. 2 Rec. ITU-T G.8010/Y.1306 (2004)/Amd.2 (07/2010) IEEE Standard 802.1aj-2009, IEEE Standard for Local and Metropolitan Area Networks: Virtual Br
26、idged Local Area Networks, Amendment 11: Two-Port Media Access Control (Mac) Relay. 4.2 Terms to be removed from ITU-T G.8010 The following table identifies the target terms and appropriate replacement definition text. Original Text Replacement Text 3.3 This Recommendation defines the following term
27、s: 3.3.1 traffic conditioning function: A “transport processing function“ which accepts the characteristic information of the layer network at its input, classifies the traffic units according to configured rules, meters each traffic unit within its class to determine its eligibility, polices non-co
28、nformant traffic units and presents the remaining traffic units at its output as characteristic information of the layer network. 3.3.2 maintenance entity group: A maintenance entity group is defined, for the purpose of fragment/connection monitoring, between a set of flow/connection points within a
29、 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. The maintenance entity group consists of one or more maintenance entities. 3.3.3 maintenance entit
30、y: 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 accepts the characteristic information of the layer network at its input, extracts and processes the
31、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 information of the layer or a client layer at its output, potentially as a (client) layer mainten
32、ance 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 layer network at its input, adapts that information, filters it for OAM information interfering w
33、ith 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 This Recommendation uses the following terms defined in Rec. ITU-T G.8001/Y.1354: 3.3.1 traffic conditioning function 3.3.2 maintenance en
34、tity group 3.3.3 maintenance entity 3.3.4 maintenance entity group end point compound sink function 3.3.5 maintenance entity group end point compound source function 3.3.6 maintenance entity group intermediate point compound function 3.3.7 proactive monitoring 3.3.8 on-demand monitoring 3.3.9 ETH_CI
35、 group 3.3.10 ETH path 3.3.11 ETH tandem connection 3.3.12 ETH section Editors Note: The “traffic conditioning function“ (defined in the original ITU-T G.8010) was redefined as “traffic conditioning and shaping function“ in ITU-T G.8010 Amendment 1. Rec. ITU-T G.8010/Y.1306 (2004)/Amd.2 (07/2010) 3
36、Original Text Replacement Text 3.3.6 maintenance entity group intermediate 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 mo
37、nitoring and presents the characteristic information without the OAM it reacted 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 the
38、ir occurrence in order to verify the service level agreement and/or initiate 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
39、a maintenance entity group at a specific point in time with the purpose to 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 adde
40、d to one of the ETH_CI signals in the group. 3.3.10 ETH path: The highest ETH 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. 4.3 Modifications
41、 to clauses 6.5.2.2.3 and 6.5.1.3 and Figure V.5 In clauses 6.5.2.2.3 and 6.5.1.3 and in the title of Figure V.5 change the following acronyms: Change “T-MPLS“ to “MPLS-TP“ In clause 6.5.1.3 change “/TM“ to “/MT“ In clause 6.5.2.2.3 change “TM/“ to “MT/“ In clause 6.5.1.3 change the line Type field
42、encapsulation (0x8847 for unicast, per RFC 3032). to read: Type field encapsulation. 4 Rec. ITU-T G.8010/Y.1306 (2004)/Amd.2 (07/2010) 4.4 Add new clause 9 Add a new clause 9 as follows: 9 Transport functional architecture of Ethernet networks (using ITU-T G.800) This clause presents the functional
43、architecture of Ethernet layer networks based on Recommendation ITU-T G.800 Unified functional architecture of transport networks. This functional architecture covers the Ethernet network structure and behaviour specified in the following standards: IEEE 802.1D-2004, Media Access Control (MAC) Bridg
44、es. IEEE 802.1Q-2005, Virtual Bridged Local Area Networks. IEEE 802.1ad-2005, Virtual Bridged Local Area Networks, Amendment 4: Provider Bridges. IEEE 802.1ag-2007, Virtual Bridged Local Area Networks, Amendment 5: Connectivity Fault Management. Recommendation ITU-T Y.1731 (2006), OAM functions and
45、mechanisms for Ethernet based networks. IEEE 802.1ah-2008, Virtual Bridged Local Area Networks, Amendment 7: Provider Backbone Bridges. IEEE 802.1Qaw-2009, Virtual Bridged Local Area Networks, Amendment 9: Management of Data Driven and Data Dependent Connectivity Faults. IEEE 802.1aj-2009, Virtual B
46、ridged Local Area Networks, Amendment 11: Two-Port Media Access Control (Mac) Relay. The functional architecture covers functions within the Ethernet layer network and common aspects of client and server adaptation functions. It does not cover details specific to client or server layer networks or c
47、ommon adaptation functions that are independent of the described Ethernet layer network functions (e.g., there is no discussion of LLC/SNAP or specific PHY functions). 9.1 General principles Ethernet transport networks provide a connectionless frame (packet) transport service for frames carrying cli
48、ent information. Additional functions are provided for multiplexing, supervision and survivability of the Ethernet transport entities that convey frames in the Ethernet network. The transport functional architecture of Ethernet networks is described using the generic principles defined in Recommenda
49、tions ITU-T G.805 and G.800 (using conventions as noted in Appendix VIII). The architectural aspects regarding layer network structure, characteristic information, transport entities, transport processing functions, client/server associations, topology and partitioning of Ethernet transport networks are provided in this Recommendation. 9.2 Ethernet transport network layered structure An Ethernet network layer structure may include any of a large number of media specific layer networks or other server l
