Type Extension,Name,Description,Reference
0,GATEWAY,"Specifies that a given network address is reached via a gateway on the originating router. The number of hops is indicated by the Value field, one octet per link metric type reported in an MPR_TYPES Message TLV (in the same order) or (if no MPR_TYPES Message TLV is present) using a single octet",[RFC7181][RFC7722]
1-223,,Unassigned,
224-255,,Reserved for Experimental Use,[RFC7631]