Bit (Value),Description,Reference
"0
            (0x01)",ICMP Ping,[RFC5085]
"1
            (0x02)",Reserved,[RFC5085]
"2
            (0x04)","BFD IP/UDP-encapsulated, for PW Fault Detection only",[RFC5885]
"3
            (0x08)","BFD IP/UDP-encapsulated, for PW Fault Detection and   
AC/PW Fault Status Signaling",[RFC5885]
"4
            (0x10)","BFD PW-ACH-encapsulated, for PW Fault Detection only",[RFC5885]
"5
            (0x20)","BFD PW-ACH-encapsulated, for PW Fault Detection and   
AC/PW Fault Status Signaling",[RFC5885]
"6
            (0x40)","S-BFD IP/UDP-encapsulated, for PW Fault Detection only",[RFC7885]
"7
            (0x80)","S-BFD L2SS-encapsulated, for PW Fault Detection only",[RFC7885]