On Oct 23, 2013, at 9:55 AM, Ben Pfaff <b...@nicira.com> wrote:

> On Tue, Oct 22, 2013 at 05:20:41PM -0700, Jarno Rajahalme wrote:
>> OpenFlow 1.1+ specs encourage switches to verify action consistency
>> at flow setup time.  Implement this for OpenFlow 1.1+ only to not
>> break any current OF 1.0 based use.
>> 
>> Signed-off-by: Jarno Rajahalme <jrajaha...@nicira.com>
> 
> I'm a little concerned about enforcing consistency in Write-Actions.  I
> don't think we can do it in such a strict manner, anyway.  As written, I
> believe that this will reject, for example, a Write-Actions to push a
> VLAN if there is one already, even if a later Apply-Actions might strip
> the VLAN.  I doubt that's desirable or the intent of the standard.

I did not come to think of this..  It seems Write-Actions are like Group bucket 
actions in this regard, they do not apply in the context of a specific flow 
match only, but at a later stage, so there is not enough context at flow setup 
time to enforce consistency. Would you think that just not enforcing 
consistency for Write-Actions at all is the proper way to handle this?

  Jarno
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