what is defined in ofp_match()?

On Thu, 2013-06-20 at 23:27 -0300, Anderson Sartor wrote: 
> I'm trying to clear all flows from the switches, but the flows are not
> being removed.
> I'm doing the following:
>    msg = of.ofp_flow_mod(match=of.ofp_match(),command=of.OFPFC_DELETE)
>    for connection in core.openflow._connections.values():
>       connection.send(msg)
> 
> 
> Why is this not working?
> 
> 
> Thanks,
> 
> 

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