Value,Protocol ID,Reference
0,RESERVED,[RFC3547]
1,GDOI_PROTO_IPSEC_ESP,[RFC3547]
2,GDOI_PROTO_IPSEC_AH,[RFC6407]
3,GDOI_PROTO_IEC_61850,[RFC8052]
4-127,Unassigned,[RFC3547]
128-255,Private Use,[RFC3547]