[ovs-discuss] Drop action behaviour

Reid Price rprice at nicira.com
Wed Oct 9 20:06:14 UTC 2013


Hi Mark,

The 'drop' is implicit.  If the switch executions no actions,
either from 'actions=', 'actions=drop', or any other sequence
of events that has no output, then the switch will appear
to have dropped the packet, since it was not forwarded
anywhere.

  -Reid


On Wed, Oct 9, 2013 at 8:54 AM, Kavanagh, Mark B
<mark.b.kavanagh at intel.com>wrote:

>  Hi,****
>
> ** **
>
> I have a question regarding the behaviour of the drop action.****
>
> ** **
>
> The FAQ states:****
>
>         “An empty set of actions causes a packet to be dropped.  You can****
>
>         specify an empty set of actions with "actions=" on the ovs-ofctl
> command line”.****
>
> ** **
>
> So, for example if I add a flow using ofctl, specifying the action as
> ‘drop’, I assume that a flow table entry, consisting of the flow key and an
> empty actions field is added to the vswitchd’s flow table.  ****
>
> In terms of how the drop action actually works, is there an explicit DROP
> action that is executed for flows that match this flow entry (similar to
> the PUSH_VLAN, OUTPUT, SET, etc. actions), and if not, what is the
> mechanism by which packets are dropped?****
>
> ** **
>
> Thanks,****
>
> Mark****
>
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