+.
+.IP
+\fBofproto\-trace\-packet\-out\fR accepts an additional
+\fB\-consistent\fR option. With this option specified, the command
+rejects \fIactions\fR that are inconsistent with the specified packet.
+(An example of an inconsistency is attempting to strip the VLAN tag
+from a packet that does not have a VLAN tag.) Open vSwitch ignores
+most forms of inconsistency in OpenFlow 1.0 and rejects
+inconsistencies in later versions of OpenFlow. The option is
+necessary because the command does not ordinarily imply a particular
+OpenFlow version. One exception is that, when \fIactions\fR includes
+an action that only OpenFlow 1.1 and later supports (such as
+\fBpush_vlan\fR), \fB\-consistent\fR is automatically enabled.