Table of Contents

 1     Scope          
 2     References
 3     Definitions
        3.1     Terms defined elsewhere       
        3.2     Terms defined in this Recommendation           
 4     Abbreviations and acronyms             
 5     Conventions            
        5.1     Representation of octets        
 6     Introduction             
 7     Ring protection characteristics         
        7.1     Monitoring methods and conditions  
        7.2     Ethernet traffic and bandwidth consideration
        7.3     Ethernet ring protection switching performance          
 8     Ring protection conditions and commands 
 9     Ring protection architectures           
        9.1     Revertive and non-revertive switching              
        9.2     Protection switching triggers 
        9.3     Protection switching models on a single Ethernet ring
        9.4     Traffic channel blocking           
        9.5     R-APS channel blocking            
        9.6     Filtering database flush            
        9.7     Ethernet ring protection switching models for interconnection              
10     Protection control protocol              
       10.1     Principles of operations         
       10.2     Protection switching behaviour          
       10.3     R-APS format              
       10.4     Failure of protocol defect      
Appendix I – Ring protection network objectives    
Appendix II – Ethernet ring network objectives    
Appendix III – Ring protection scenarios    
Appendix IV – Considerations for different timers    
       IV.1     State machine use of timers  
       IV.2     Guard timer use to block outdated R-APS messages   
Appendix V    
Appendix VI    
Appendix VII    
Appendix VIII – Flush optimization    
     VIII.1     Flushing FDB consideration   
     VIII.2     Scenarios of unnecessary FDB flushing             
     VIII.3     Example of FDB flush optimization     
     VIII.4     Additional definition of the ERP control process model and state machine        
     VIII.5     DNF status    
Appendix IX    
Appendix X    
Appendix XI