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Carrier Ethernet Class of Service IA Implementation Agreement MEF 23.1 Carrier Ethernet Class of Service – Phase 2 January 2012 MEF 23.1 © The Metro Ethernet Forum 2012. Any reproduction of this document, or any portion thereof, shall contain the following statement: "Reproduced with permission of the Metro Ethernet Forum." No user of this document is authorized to modify any of the information contained herein. Carrier Ethernet Class of Service – Phase 2 Disclaimer The information in this publication is freely available for reproduction and use by any recipient and is believed to be accurate as of its publication date. Such information is subject to change without notice and the Metro Ethernet Forum (MEF) is not responsible for any errors. The MEF does not assume responsibility to update or correct any information in this publication. No representation or warranty, expressed or implied, is made by the MEF concerning the completeness, accuracy, or applicability of any information contained herein and no liability of any kind shall be assumed by the MEF as a result of reliance upon such information. The information contained herein is intended to be used without modification by the recipient or user of this document. The MEF is not responsible or liable for any modifications to this document made by any other party. The receipt or any use of this document or its contents does not in any way create, by implication or otherwise: any express or implied license or right to or under any patent, copyright, trademark or trade secret rights held or claimed by any MEF member company which are or may be associated with the ideas, techniques, concepts or expressions contained herein; nor any warranty or representation that any MEF member companies will announce any product(s) and/or service(s) related thereto, or if such announcements are made, that such announced product(s) and/or service(s) embody any or all of the ideas, technologies, or concepts contained herein; nor any form of relationship between any MEF member companies and the recipient or user of this document. Implementation or use of specific Metro Ethernet standards or recommendations and MEF specifications will be voluntary, and no company shall be obliged to implement them by virtue of participation in the Metro Ethernet Forum. The MEF is a non-profit international organization accelerating industry cooperation on Metro Ethernet technology. The MEF does not, expressly or otherwise, endorse or promote any specific products or services. © The Metro Ethernet Forum 2012. All Rights Reserved. MEF 23.1 © The Metro Ethernet Forum 2012. Any reproduction of this document, or any portion thereof, shall contain the following statement: "Reproduced with permission of the Metro Ethernet Forum." No user of this document is authorized to modify any of the information contained herein. Carrier Ethernet Class of Service – Phase 2 1. ABSTRACT .............................................................................................................................1 2. TERMINOLOGY....................................................................................................................1 3. SCOPE......................................................................................................................................8 4. COMPLIANCE LEVELS ....................................................................................................10 5. INTRODUCTION.................................................................................................................10 6. CLASS OF SERVICE MODEL AND OBJECTIVES (NORMATIVE) .........................11 6.1 MOTIVATION AND BACKGROUND ON COS MODEL ............................................................11 6.2 KEY TERMS AND HOW THEY RELATE TO EACH OTHER.....................................................13 6.3 COS LABEL........................................................................................................................15 6.4 COS AND COLOR IDENTIFIERS ...........................................................................................15 6.4.1 CoS Identifier and Indication.....................................................................................15 6.4.2 Color Identifier and Indication ..................................................................................17 6.5 COS LABEL, COS IDENTIFICATION AND COLOR IDENTIFICATION REQUIREMENTS ............18 6.5.1 Default CoS Label for L2CP .....................................................................................21 6.6 PERFORMANCE TIER AND ETHERNET NETWORK SECTIONS MODEL ..................................22 6.6.1 Performance Tier Model............................................................................................22 6.6.2 Ethernet Network Section Model ..............................................................................24 6.7 PERFORMANCE ATTRIBUTES AND METRICS.......................................................................26 6.7.1 Frame Delay Performance .........................................................................................27 6.7.2 Mean Frame Delay Performance ...............................................................................28 6.7.3 Inter-Frame Delay Variation Performance ................................................................28 6.7.4 Frame Delay Range Performance ..............................................................................29 6.7.5 Frame Loss Ratio Performance .................................................................................30 6.7.6 Availability and Resiliency Performance ..................................................................30 6.8 BANDWIDTH PROFILE AND COLOR ....................................................................................31 6.8.1 Bandwidth Profile Compliance..................................................................................32 6.8.2 Egress Bandwidth Profile Considerations .................................................................33 6.9 EVC AND SERVICE TYPE APPLICABILITY ..........................................................................33 6.10 OVC AND SERVICE TYPE APPLICABILITY .........................................................................34 6.11 COS LABEL MODEL...........................................................................................................34 6.11.1 Three CoS Label Model.............................................................................................35 6.11.2 Performance Parameters ............................................................................................38 6.11.3 CoS Performance Objectives Per Performance Tier .................................................41 6.11.4 PCP and DSCP Mapping ...........................................................................................46 6.11.4.1 UNI Mapping ..................................................................................................... 46 6.11.4.2 ENNI Mapping................................................................................................... 46 MEF 23.1 © The Metro Ethernet Forum 2012. Any reproduction of this document, or any portion thereof, shall Page i contain the following statement: "Reproduced with permission of the Metro Ethernet Forum." No user of this document is authorized to modify any of the information contained herein. Carrier Ethernet Class of Service – Phase 2 6.11.5 L2CP CoS Mapping...................................................................................................46 6.11.6 Requirement Sets .......................................................................................................47 7. REFERENCES......................................................................................................................47 8. APPENDICES (INFORMATIVE) ......................................................................................49 8.1 POTENTIAL WORK AREAS FOR LATER PHASES OF MEF COS IA.......................................49 8.1.1 CoS Subset Mapping .................................................................................................49 8.1.2 Other Potential Work Areas.......................................................................................49 8.2 PERFORMANCE TIER MODEL DERIVATION ........................................................................49 8.2.1 Low Speed Link Considerations................................................................................50 8.3 ETHERNET NETWORK SECTION MODEL – COMPOSING UNI-UNI VALUES........................50 8.3.1 Mean delay.................................................................................................................52 8.3.2 Loss ratio ...................................................................................................................52 8.3.3 Relationship for delay and delay range .....................................................................53 8.3.4 Ethernet Network Section Recommendations ...........................................................54 8.4 KEY APPLICATIONS TO DERIVE PERFORMANCE REQUIREMENTS.......................................55 8.4.1 Application-specific Performance Objectives ...........................................................56 8.4.2 Derivation of CPOs from Application Performance Requirements ..........................76 8.4.2.1 Mapping Applications to CoS Labels and Performance Tiers ........................... 77 8.4.2.2 Constraints on CPO Values...............................................................................
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