This option is most useful for debugging. It reduces switching
performance, so it should not be used in production.
.
-.IP "\fB\-w\fR"
-.IQ "\fB\-\-wildcard\fR"
+.IP "\fB\-w\fR[\fIwildcard_mask\fR]"
+.IQ "\fB\-\-wildcards\fR[\fB=\fIwildcard_mask\fR]\fR"
By default, \fBovs\-controller\fR sets up exact-match flows. This
option allows it to set up wildcarded flows, which may reduce
-flow-setup latency by causing less traffic to be sent up to the
+flow setup latency by causing less traffic to be sent up to the
controller.
.IP
+The optional \fIwildcard_mask\fR is an OpenFlow wildcard bitmask in
+hexadecimal that specifies the fields to wildcard. If no
+\fIwildcard_mask\fR is specified, the default value 0x2820F0 is used
+which specifies L2-only switching and wildcards L3 and L4 fields.
+Another interesting value is 0x2000EC, which specifies L3-only
+switching and wildcards L2 and L4 fields.
+.IP
This option has no effect when \fB\-n\fR (or \fB\-\-noflow\fR) is in use
(because the controller does not set up flows in that case).
.