Bit Number,Description,Reference
0,Continuity Check (CC),[RFC7260]
1,Connectivity Verification (CV),[RFC7260]
2,Fault Management Signal (FMS),[RFC7260]
3,Performance Monitoring/Loss (PM/Loss),[RFC7260]
4,Performance Monitoring/Delay (PM/Delay),[RFC7260]
5,Performance Monitoring/Throughput Measurement (PM/Throughput),[RFC7260]
>= 6,Unassigned,