You could look for flow-removed messages from switch and use that to adjust
flows installed in your app accordingly.
In OpenFlow version >= 1.4 you could use flow monitoring as well. This way you
can keep a check on flows in the switch.
7.3.5.19 Flow Monitoring
https://www.opennetworking.org/images/stories/downloads/sdn-resources/onf-specifications/openflow/openflow-switch-v1.5.0.noipr.pdf#page149
> On Feb 28, 2018, at 12:49 AM, knet solutions <knetsolutio...@gmail.com> wrote:
>
> If we maintain the count in SDN controller, There is a possibility of
> mismatch in the count between the switch and controller .
> Each flow has a timeout(idle and hard), it will be flushed out after the
> timeout period.
>
>> On Wed, Feb 28, 2018 at 1:59 PM, Moh'd Reza Abbasi <mr.mrabb...@gmail.com>
>> wrote:
>> I don't think OpenFlow v.1.3 has such a feature, but how about adding a
>> counter in your Ryu app to keep track of added/removed rules...
>>
>>> On Wed, Feb 28, 2018 at 11:53 AM, Eman Bany salameh via Ryu-devel
>>> <ryu-devel@lists.sourceforge.net> wrote:
>>> Hi,
>>>
>>> I need to know the number of flows installed on the switch before adding
>>> new one. What I did before is to request stat from the switch then read the
>>> length of the list returned.
>>> This way is not useful for me.
>>> Is there any way to count them inside packet-in handler before adding new
>>> flow? I want to limit the number of flows added to 1500.
>>>
>>> Regards,
>>> Eman Bany Salameh
>>>
>>>
>>>
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>>
>>
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>
>
>
> --
> Regards,
> Knet solutions.
>
> https://github.com/knetsolutions/KNet
> http://knet-topology-builder.readthedocs.io/
> http://knetsolutions.in/
>
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