Seems the only explanation is "when you add a flow which forwards
packets to a non-existing port"
I find it from: http://www.openflowswitch.org/wk/index.php/OpenFlow_v1.0.
The flow_mod below seems will not lead to my error.

On Fri, Mar 5, 2010 at 3:24 AM, Guanyao Huang <[email protected]> wrote:
> Hello
> My program shows error of type2 code4. From specification it means
> OFPBAC_BAD_OUT_PORT error.
> I want to know if one simple case is the possible reason.
> Suppose the switch already has one entry for the flow, but now I
> OFPFC_ADD a new entry with different port. Will this lead to the error
> above? Or, the switch will simply delete the existing entry and insert
> the new one. It seems my calculated path will not have a bad port
> which leads to nowhere.
> Thanks.
>

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