The \fIfile\fR argument must the same one specified on the
\fBudatapath\fR command line.
+.PP
The optional \fIcontroller\fR argument specifies how to connect to
the OpenFlow controller. It takes one of the following forms:
\fBunix:\fIfile\fR
The Unix domain server socket named \fIfile\fR.
+.PP
If \fIcontroller\fR is omitted, \fBsecchan\fR attempts to discover the
location of the controller automatically (see below).
.RE
.IP
-As a result, when both \fB--fail=open\fR and in-band control are not
-in use, this option has no effect.
+As a result, when both \fB--fail=closed\fR and \fB--out-of-band\fR are
+specified, this option has no effect.
.TP
\fB--max-backoff=\fIsecs\fR