Type,Description,Reference
0,Route Monitoring,[RFC7854]
1,Statistics Report,[RFC7854]
2,Peer Down Notification,[RFC7854]
3,Peer Up Notification,[RFC7854]
4,Initiation,[RFC7854]
5,Termination,[RFC7854]
6,Route Mirroring,[RFC7854]
7-250,Unassigned,
251-254,Experimental,[RFC7854]
255,Reserved,[RFC7854]