Value,Description,Reference
0,Reserved,[RFC9353][RFC5088]
1,PCE-ADDRESS,[RFC9353][RFC5088]
2,PATH-SCOPE,[RFC9353][RFC5088]
3,PCE-DOMAIN,[RFC9353][RFC5088]
4,NEIG-PCE-DOMAIN,[RFC9353][RFC5088]
5,PCE-CAP-FLAGS,[RFC9353][RFC5088]
6,KEY-ID,[RFC9353]
7,KEY-CHAIN-NAME,[RFC9353]
8-65535,Unassigned,