Value,Description,Reference
0,NAI is absent.,[RFC8664]
1,NAI is an IPv4 node ID.,[RFC8664]
2,NAI is an IPv6 node ID.,[RFC8664]
3,NAI is an IPv4 adjacency.,[RFC8664]
4,NAI is an IPv6 adjacency with global IPv6 addresses.,[RFC8664]
5,NAI is an unnumbered adjacency with IPv4 node IDs.,[RFC8664]
6,NAI is an IPv6 adjacency with link-local IPv6 addresses.,[RFC8664]
7-15,Unassigned,