Bit Number,Hex Value,Name,Reference
0-2,,Unassigned,
3,0x10,Hierarchy/stitching (H),[RFC6107]
4,0x08,Bundle (B),[RFC6107]
5,0x04,Routing adjacency (R),[RFC6107]
6,0x02,TE link (T),[RFC6107]
7,0x01,Private (P),[RFC6107]