See the ofp_port_state enumeration in section 7.2.1 of the OpenFlow 1.3.4 specification
ofp_port_state
type t
= portState
val marshal : portState ‑> int32
val parse : int32 ‑> portState
val to_string : portState ‑> string
to_string v pretty-prints v
to_string v
v