[pox-dev] Modifying existing flows on a switch periodically

[Sadia Bashir]

Thank you Murphy, It gave me a fair idea to precede.


On Mon, Dec 16, 2013 at 11:29 AM, Murphy McCauley <murphy.mccauley at gmail.com
> wrote:

> Set your flow-mod's .command attribute to OFPFC_MODIFY (or
> OFPFC_MODIFY_STRICT).  If you've imported libopenflow as "of" (the POX
> convention), it's something like:
>
> fm = of.ofp_flow_mod()
> ...
> fm.command = of.OFPFC_MODIFY_STRICT
> ...
> connection.send(fm)
>
>
> -- Murphy
>
> On Dec 15, 2013, at 10:16 PM, Sadia Bashir <11msccssbashir at seecs.edu.pk>
> wrote:
>
> Thank you Junaid Khalid and Murphy!
>
> I just got this from pox.openflow.libopenflow_o1
>
> ofp_flow_mod_command_rev_map = {
>   'OFPFC_ADD'           : 0,
>   'OFPFC_MODIFY'        : 1,
>   'OFPFC_MODIFY_STRICT' : 2,
>   'OFPFC_DELETE'        : 3,
>   'OFPFC_DELETE_STRICT' : 4,
> }
>
>
> I am not getting clear how do I use it in flow-mods. Please refer me to
> some example for it. Thank you for your guide and help. Thanks a lot!
>
> sadia
>
>
> On Mon, Dec 16, 2013 at 7:20 AM, Murphy McCauley <
> murphy.mccauley at gmail.com> wrote:
>
>> On Dec 14, 2013, at 1:56 PM, Sadia Bashir <11msccssbashir at seecs.edu.pk>
>> wrote:
>>
>> > Hi,
>> >
>> > I want to modify queue_id in installed flows on a switch periodically
>> by sending a flow_mod message from controller(i.e., controller-to-switch
>> message) I tried it using this way on pox-controller:
>> >
>> > def _timer_func ():
>> >     for connection in core.openflow._connections.values():
>> >            connection.send(of.ofp_action_nw_tos(port = 1, queue_id = 2))
>>
>> This isn’t a flow-mod.  This is just an action!  Construct flow mods for
>> the flows you want to change and include the new action.
>>
>> > def launch():
>> >      from pox.lib.recoco import Timer
>> >      Timer(4, _timer_func, recurring=True)
>> >
>> > Please tell me if there is a way to modify a value in already existing
>> flow entries on the switch.
>> >
>> > Thanks in advance for any hint or help.
>> > --
>> > sadia
>>
>> Hope that helps.
>>
>> — Murphy
>
>
>
>
> --
>
>
>
>
>


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