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.8032/Y.1344 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1 (11/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Packet over Transport aspects Ethernet over Transport aspects SERIES
2、 Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Ethernet ring protection switching Amendment 1 Recommendation ITU-T G.8032/Y.1344 (2015) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITA
3、L 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 METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTE
4、RNATIONAL 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.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWO
5、RKS 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 G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 E
6、thernet 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 to the list of ITU-T Recommendations. Rec. ITU-T G.8032/Y
7、.1344 (2015)/Amd.1 (11/2016) i Recommendation ITU-T G.8032/Y.1344 Ethernet ring protection switching Amendment 1 Summary Recommendation ITU-T G.8032/Y.1344 defines the automatic protection switching (APS) protocol and protection switching mechanisms for Ethernet layer network (ETH) ring topologies.
8、Included are details pertaining to Ethernet ring protection characteristics, architectures and the ring APS (R-APS) protocol. Amendment 1 provides support for management information indicating the node state of an Ethernet ring node and the port states of an Ethernet ring nodes ports. It also update
9、s references to Recommendation ITU-T G.870/Y.1352 with references to Recommendation ITU-T G.808. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.8032/Y.1344 2008-06-22 15 11.1002/1000/9415 1.1 ITU-T G.8032/Y.1344 (2008) Amd. 1 2009-04-22 15 11.1002/1000/9678 2.0 ITU-T G.80
10、32/Y.1344 2010-03-09 15 11.1002/1000/10661 2.1 ITU-T G.8032/Y.1344 (2010) Amd. 1 2010-06-11 15 11.1002/1000/10934 2.2 ITU-T G.8032/Y.1344 (2010) Cor. 1 2010-10-07 15 11.1002/1000/10902 2.3 ITU-T G.8032/Y.1344 (2010) Amd. 2 2011-02-25 15 11.1002/1000/11328 3.0 ITU-T G.8032/Y.1344 2012-02-13 15 11.100
11、2/1000/11514 3.1 ITU-T G.8032/Y.1344 (2012) Amd. 1 2013-07-12 15 11.1002/1000/12025 4.0 ITU-T G.8032/Y.1344 2015-08-13 15 11.1002/1000/12550 4.1 ITU-T G.8032/Y.1344 (2015) Amd. 1 2016-11-13 15 11.1002/1000/13096 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address fiel
12、d 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.8032/Y.1344 (2015)/Amd.1 (11/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunic
13、ations, 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 standardizing telecommunicat
14、ions 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 covered by the procedure
15、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 indicate both a telecommun
16、ication 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 achieved when all of these m
17、andatory 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 PROPERTY RIGHTSITU draw
18、s 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 asserted by ITU members or
19、 others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represen
20、t 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 whatsoever, without the prior written permission of ITU. Rec. ITU-T G.8032/Y.1344 (2
21、015)/Amd.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 . 4 4 Abbreviations and acronyms 4 5 Conventions 6 5.1 Representation of octets . 6 6 Introduction . 6 7 Ring protection characteristics
22、 . 7 7.1 Monitoring methods and conditions . 7 7.2 Ethernet traffic and bandwidth consideration . 7 7.3 Ethernet ring protection switching performance 7 8 Ring protection conditions and commands. 7 9 Ring protection architectures 8 9.1 Revertive and non-revertive switching . 8 9.2 Protection switchi
23、ng triggers 8 9.3 Protection switching models on a single Ethernet ring 9 9.4 Traffic channel blocking . 12 9.5 R-APS channel blocking 12 9.6 Filtering database flush . 13 9.7 Ethernet ring protection switching models for interconnection . 13 10 Protection control protocol . 22 10.1 Principles of op
24、erations 22 10.2 Protection switching behaviour 40 10.3 R-APS format . 45 10.4 Failure of protocol defect . 47 Appendix I Ring protection network objectives . 48 Appendix II Ethernet ring network objectives 50 Appendix III Ring protection scenarios 52 Appendix IV Considerations for different timers
25、. 61 IV.1 State machine use of timers 61 IV.2 Guard timer use to block outdated R-APS messages . 61 Appendix V 63 Appendix VI . 64 Appendix VII . 65 iv Rec. ITU-T G.8032/Y.1344 (2015)/Amd.1 (11/2016) Page Appendix VIII Flush optimization 66 VIII.1 Flushing FDB consideration . 66 VIII.2 Scenarios of
26、unnecessary FDB flushing . 66 VIII.3 Example of FDB flush optimization . 66 VIII.4 Additional definition of the ERP control process model and state machine 67 VIII.5 DNF status 72 Appendix IX . 73 Appendix X 74 Appendix XI . 75 Bibliography. 76 Rec. ITU-T G.8032/Y.1344 (2015)/Amd.1 (11/2016) 1 Recom
27、mendation ITU-T G.8032/Y.1344 Ethernet ring protection switching Amendment 1 Editorial note: This is a complete-text publication. Modifications introduced by this amendment are shown in revision marks relative to Recommendation ITU-T G.8032/Y.1344 (2015). 1 Scope This Recommendation defines the auto
28、matic protection switching (APS) protocol and protection switching mechanisms for Ethernet layer network (ETH) ring topologies. The protection protocol defined in this Recommendation enables protected point-to-point, point-to-multipoint and multipoint-to-multipoint connectivity within a ring or inte
29、rconnected rings, called “multi-ring/ladder network“ topology. The ETH ring maps to the physical layer ring structure. Protection schemes for the other layers, including the Ethernet physical layer network (ETY), are out of the scope of this Recommendation. 2 References The following ITU-T Recommend
30、ations 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 references are subject to revision; users of this Recommendation are theref
31、ore 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 reference to a document within this Recommendation does not give it, as a stand-
32、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.806 Recommendation ITU-T G.806 (2012), Characteristics of transport equipment Description methodology and generic functionality. ITU-T G.808 R
33、ecommendation ITU-T G.808 (2016), Terms and definitions for network protection and restoration. ITU-T G.808.1 Recommendation ITU-T G.808.1 (2014), Generic protection switching Linear trail and subnetwork protection. ITU-T G.809 Recommendation ITU-T G.809 (2003), Functional architecture of connection
34、less layer networks. ITU-T G.870 Recommendation ITU-T G.870/Y.1352 (2012), Terms and definitions for optical transport networks (OTN). ITU-T G.8001 Recommendation ITU-T G.8001/Y.1354 (20163), Terms and definitions for Ethernet frames over transport. ITU-T G.8010 Recommendation ITU-T G.8010/Y.1306 (2
35、004), Architecture of Ethernet layer networks. ITU-T G.8013 Recommendation ITU-T G.8013/Y.1731 (20153), Operation, administration and management (OAM) functions and mechanisms for Ethernet based networks. 2 Rec. ITU-T G.8032/Y.1344 (2015)/Amd.1 (11/2016) ITU-T G.8021 Recommendation ITU-T G.8021/Y.13
36、41 (20165), Characteristics of Ethernet transport network equipment functional blocks. IEEE 802.1Q IEEE Std 802.1Q (2014), IEEE standard for local and metropolitan area networks: Media access control (MAC) bridges and virtual bridged local area networks. 3 Definitions 3.1 Terms defined elsewhere Thi
37、s Recommendation uses the following terms defined elsewhere: 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 adaptation: ITU-T G.809 3.1.2 adapted information: ITU-T G.805 3.1.3 characteristic information: ITU-T G.805 3.1.4 defect: ITU-T G.806 3.1.5
38、ERP instance: ITU-T G.8001 3.1.6 Ethernet ring node: ITU-T G.8001 3.1.7 Ethernet ring: ITU-T G.8001 3.1.8 failure: ITU-T G.806 3.1.9 flow: ITU-T G.809 3.1.10 hold-off time: ITU-T G.808 3.1.11 interconnection node: ITU-T G.8001 3.1.12 layer network: ITU-T G.809 3.1.13 link: ITU-T G.805 3.1.14 mainten
39、ance entity (ME): ITU-T G.8001 3.1.15 maintenance entity group (MEG): ITU-T G.8001 3.1.16 major ring: ITU-T G.8001 3.1.17 MEG end point (MEP): ITU-T G.8001 3.1.18 network: ITU-T G.809 3.1.19 non-revertive (protection) operation: ITU-T G.808 3.1.20 port: ITU-T G.809 3.1.21 protected domain: ITU-T G.8
40、08 3.1.22 protection transport entity: ITU-T G.808 3.1.23 protection: ITU-T G.808 3.1.24 R-APS virtual channel: ITU-T G.8001 3.1.25 revertive (protection) operation: ITU-T G.808 3.1.26 ring MEL: ITU-T G.8001 3.1.27 ring protection link (RPL): ITU-T G.8001 3.1.28 RPL neighbour node: ITU-T G.8001 3.1.
41、29 RPL owner node: ITU-T G.8001 3.1.30 server signal fail (SSF): ITU-T G.806 3.1.31 signal degrade (SD): ITU-T G.806 Rec. ITU-T G.8032/Y.1344 (2015)/Amd.1 (11/2016) 3 3.1.32 signal fail (SF): ITU-T G.806 3.1.33 signal: ITU-T G.808 3.1.34 sub-ring link: ITU-T G.8001 3.1.35 sub-ring: ITU-T G.8001 3.1.
42、36 switch: ITU-T G.808 3.1.37 switching time: ITU-T G.808 3.1.38 tandem connection: ITU-T G.805 3.1.39 trail signal fail (TSF): ITU-T G.806 3.1.40 trail: ITU-T G.805 3.1.41 transfer time (Tt): ITU-T G.808.1 3.1.42 transport entity: ITU-T G.809 3.1.43 transport: ITU-T G.809 3.1.44 wait to block timer
43、: ITU-T G.8001 3.1.45 wait-to-restore time: ITU-T G.808 3.1.46 working transport entity: ITU-T G.808 3.1.1 Terms defined in ITU-T G.805: a) adapted information b) characteristic information c) link d) tandem connection e) trail 3.1.2 Terms defined in ITU-T G.806: a) defect b) failure c) server signa
44、l fail (SSF) d) signal degrade (SD) e) signal fail (SF) f) trail signal fail (TSF) 3.1.3 Terms defined in ITU-T G.808.1: a) transfer time (Tt) 3.1.4 Terms defined in ITU-T G.809: a) adaptation b) flow c) layer network d) network e) port f) transport g) transport entity 3.1.5 Terms defined in ITU-T G
45、.870: a) hold-off time b) non-revertive (protection) operation 4 Rec. ITU-T G.8032/Y.1344 (2015)/Amd.1 (11/2016) c) protected domain d) protection e) protection transport entity f) revertive (protection) operation g) signal h) switch i) switching time j) wait-to-restore time k) working transport ent
46、ity 3.1.6 Terms defined in ITU-T G.8001: a) ERP instance b) Ethernet ring c) Ethernet ring node d) interconnection node e) maintenance entity (ME) f) maintenance entity group (MEG) g) major ring h) MEG end point (MEP) i) R-APS virtual channel j) ring MEL k) ring protection link (RPL) l) RPL neighbou
47、r node m) RPL owner node n) sub-ring o) sub-ring link p) wait to block timer 3.2 Terms defined in this Recommendation None. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AI Adapted Information APS Automatic Protection Switching BPR Blocked Port Refer
48、ence CCM Continuity Check Message CI Characteristic Information DNF Do Not Flush E-LAN Ethernet LAN EPL Ethernet Private Line Rec. ITU-T G.8032/Y.1344 (2015)/Amd.1 (11/2016) 5 ERP Ethernet Ring Protection ETH Ethernet layer network ETHDi Ethernet MAC layer network Diagnostic function within MIP ETY
49、Ethernet physical layer network EVPL Ethernet Virtual Private Line FDB Filtering Database FF Flow Forwarding FOP-PM Failure Of Protocol Provisioning Mismatch FOP-TO Failure Of Protocol Time Out FP Flow Point FS Forced Switch GFP Generic Framing Procedure ID Identification MAC Media Access Control MEG Maintenance Entity Group MEL Maintenance Entity group Level MEP Maintenance en
