Value,Description,Reference
0x01,Leader (L-bit),[RFC2328][RFC9454]
0x02,More (M-bit),[RFC2328]
0x04,Init (I-bit),[RFC2328]
0x08,Unassigned,
0x10,IPv6 MTU (M6-bit),[RFC5838]
0x20,Unassigned,
0x40,Unassigned,
0x80,Unassigned,