+.IP "\fBset\-if \fIdp port\fR[\fB,\fIoption\fR]..."
+Reconfigures each \fIport\fR in \fIdp\fR as specified. An
+\fIoption\fR of the form \fIkey\fB=\fIvalue\fR adds the specified
+key-value option to the port or overrides an existing key's value. An
+\fIoption\fR of the form \fIkey\fB=\fR, that is, without a value,
+deletes the key-value named \fIkey\fR. The type of a port cannot be
+changed, so \fBtype=\fItype\fR is only allowed if \fItype\fR is the
+port's existing type.