CONTENTS

 1     Scope 
 2     References 
        2.1     Normative references         
        2.2     Informative references        
 3     Definitions  
 4     Symbols and abbreviations           
 5     Introduction      
        5.1     Overview of functionality    
        5.2     Identification of OAM packets from normal user-plane traffic         
        5.3     OAM payload       
        5.4     Handling of errored OAM packets 
        5.5     Engineering cost/risk considerations
        5.6     Backward compatibility considerations       
 6     OAM mechanisms           
        6.1     Features common to all OAM packets       
        6.2     Connectivity Verification (CV)       
       6.3      Fast Failure Detection (FFD)         
        6.4     Forward Defect Indication (FDI)   
        6.5     Backward Defect Indication (BDI) 
        6.6     On-demand diagnostic OAM mechanisms  
        6.7     Defect type codepoints      
        6.8     Defect type entry/exit criteria and consequent actions          
 7     Available and unavailable state processing
        7.1     Short-breaks         
        7.2     Available/unavailable state definition           
        7.3     Near-end and far-end measurements of availability 
        7.4     Near-end state processing flow-chart         
        7.5     Far-end state processing flow-chart           
        7.6     A pictorial view of near-end and far-end state processing for a short-break and an unavailability event    
 8     Security aspects
Appendix I – CV source and sink processing    
Appendix II – Indexing LSP Availability State Machine (ASM)    
Appendix III – Different possible defect scenarios when using FFD OAM    
BIBLIOGRAPHY