Value,Top Level Types,Reference
0,Reserved,[RFC3630]
1,Router Address,[RFC3630]
2,Link,[RFC3630]
3,Router IPv6 Address,[RFC5329]
4,Link Local,[RFC4203]
5,Node Attribute,[RFC5786]
6,Optical Node Property,[RFC7688]
7-32767,Unassigned,
32768-32777,Reserved for Experimental Use,[RFC3630]
32778-65535,Reserved,[RFC3630]