Value,Lower Layer,Reference
0,Reserved,[RFC6677]
1,Wired IEEE 802.1X,[RFC6677]
2,IEEE 802.11 (no-pre-auth),[RFC6677]
3,IEEE 802.11 (pre-authentication),[RFC6677]
4,IEEE 802.16e,[RFC6677]
5,IKEv2,[RFC6677]
6,PPP,[RFC6677]
7,PANA (no pre-authentication),[RFC5191][RFC6677]
8,GSS-API,[RFC7055][RFC6677]
9,PANA (pre-authentication),[RFC5873][RFC6677]
10,CoAP-EAP,[RFC9820]
11-255,Unassigned,