[ovs-dev] I think I found a bug

[Justin Pettit]

Yes, I was using some poetic license in saying that we lost; that flag was put in there as a sort of compromise for those of us not in favor of always enforcing that behavior.  If you're really interested, you can see some of the discussion starting here:

	https://mailman.stanford.edu/pipermail/openflow-dev/2008-April/000133.html

--Justin


On Feb 21, 2011, at 11:03 PM, Romain Lenglet wrote:

> Hi,
> I thought that accepting (or not) overlapping flows at the same priority was up to the controller?
> Isn't that what the check_overlap flag is for in flow_mod messages?
> -- 
> Romain Lenglet
> 
> On Tuesday, February 22, 2011 at 16:00, Justin Pettit wrote:
> 
>> I would expect so. One use that people have brought in the past is that you could setup backup routes at a lower priority, with the higher ones timing out or being forcibly removed. I don't know how useful that actually is, but people have discussed doingg that before with OpenFlow.
>> 
>> In general, Ben and I have been fairly negative in the OpenFlow discussions about putting in "sanity" checks at flow insertion time due to the complexity and expense of enforcing them. There was quite a lengthy discussion a year or so back about preventing users from being able to put overlapping flows at the same priority--we lost that one. :-)
>> 
>> --Justin
>> 
>> 
>> On Feb 21, 2011, at 10:52 PM, Derek Cormier wrote:
>> 
>>> I expected that since the flow with the lower priority will never be matched over the higher one, it has no purpose and would not be added.
>>> 
>>> Hmm, on second glance, the protocol says that if you add an identical flow that also has the same priority then the flow will just be replaced.
>>> But, I don't think it says anything about this case. Sorry, I should have confirmed that before posting.
>>> 
>>> That said, do you think these identical flows should be allowed?
>>> 
>>> - Derek
>>> 
>>> On 02/22/2011 03:43 PM, Justin Pettit wrote:
>>>> I would expect that you can. What did you expect? What did you see? It's not clear from this output if it's working or not, since neither couunter shows a value. Are you running traffic?
>>>> 
>>>> --Justin
>>>> 
>>>> 
>>>> On Feb 21, 2011, at 10:35 PM, Derek Cormier wrote:
>>>> 
>>>>> Should I be able to add two identical wildcarded flows with different priorities? I was talking with KK and he thinks this might be a bug. I always assumed this was just the way it works. Here is my ovs-ofctl flow dump:
>>>>> 
>>>>> cookie=0x0, duration=94.608s, table_id=0, n_packets=0, n_bytes=0, priority=5,dl_type=0x0005 actions=drop
>>>>> cookie=0x0, duration=98.109s, table_id=0, n_packets=0, n_bytes=0, priority=1,dl_type=0x0005 actions=drop
>>>>> 
>>>>> Thanks,
>>>>> - Derek
>>>>> 
>>>>> _______________________________________________
>>>>> dev mailing list
>>>>> dev at openvswitch.org
>>>>> http://openvswitch.org/mailman/listinfo/dev_openvswitch.org
>> 
>> 
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