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IV.2 Guard timer use to block outdated R-APS messages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
Bibliography