Bit #,Name,Reference
0,External Prefix Flag (X-flag),[RFC7794]
1,Re-advertisement Flag (R-flag),[RFC7794]
2,Node Flag (N-flag),[RFC7794]
3,ELC Flag (E-flag),[RFC9088]
4,Anycast Flag (A-flag),"[RFC9352, Section 6]"
5,U-Flag,"[RFC-ietf-lsr-igp-ureach-prefix-announce-11, Section 3.2]"
6,UP-Flag,"[RFC-ietf-lsr-igp-ureach-prefix-announce-11, Section 3.2]"