The usual approach would be something like sending one request and having a
timer trigger sending another request. You'd use some instance variables of
your component to keep track of when you sent them and of the replies.
See the "Executing Code in the Future using a Timer" section of the POX manual
for help on timers.
-- Murphy
On Nov 9, 2014, at 3:59 AM, saeedeh karami <saeedehkaram...@gmail.com> wrote:
> thanks Murphy for your attention
> i have another question, i want send, request_port_stats for 2 port of a
> switch(port_no=3, port_no=4), in pox, I want send my request twice within
> five seconds for both(port_no=3, port_no=4),also, I have written
> _handle_portstats_received(event) method out of class , and writhed
> core.openflow.addListenerByName("PortStatsReceived",
> _handle_portstats_received) in the lunch method. my question is how can i
> send my request for 2 port, twice within five seconds? and i want
> _handle_portstats_received method show report for Both time and for both port?
> can you body help me?
>
> On Tue, Oct 28, 2014 at 11:25 AM, Murphy McCauley <murphy.mccau...@gmail.com>
> wrote:
> I think this has come up a number of times in the past few years on nox-dev,
> pox-dev, and openflow-discuss. For example, see:
>
> https://www.mail-archive.com/pox-dev@lists.noxrepo.org/msg01244.html
>
> The basic idea is that you sample the counters at time A and you sample them
> at time B, subtract the first from the second and then divide by the time
> between samples. The biggest gotcha here is that it assumes the traffic to
> and from the switch for the counter request/response, the processing in the
> switch, and the processing in the controller take equal time for each sample.
> Depending on your needs for accuracy, you may want to implement a strategy
> for detecting/mitigating the variance.
>
> Alternatively, if your switch supports some other monitoring system, it may
> be more suitable for this task. For example, IPFIX puts a timestamp in the
> report packets, so variance in communication time between switch and
> controller and within the controller don't matter.
>
> -- Murphy
>
> On Oct 28, 2014, at 12:16 AM, saeedeh karami <saeedehkaram...@gmail.com>
> wrote:
>
>> hi all,
>> i have some information about flow on links(for example, links between s1
>> and s2) by run of flow-state-request function in pox, now i want know, how
>> can i calculate traffic rate with this data?
>> can any body help me?
>>
>> On Mon, Oct 27, 2014 at 4:47 PM, saeedeh karami <saeedehkaram...@gmail.com>
>> wrote:
>>
>> hi all,
>> i have some information about flow on links(for example, links between s1
>> and s2) by run of flow-state-request function in pox, now i want know, how
>> can i calculate traffic rate with this data?
>> can any body help me?
>> --
>> SaeedehKarami
>>
>>
>>
>> --
>> SaeedehKarami
>
>
>
>
> --
> SaeedehKarami
