[pox-dev] How can POX get packet counts (or beta transferred) from a switch within a timeline.

[Weiyang Mo]

Hi, Seungwon,

Thanks very much.

Now it works and I can make some logical programming to do my routing
algorithm.

Best

Weiyang

2012/9/19 Seungwon Shin <seungwon.shin at gmail.com>

> Hi, Weiyang
>
> In the case of collecting the statistical information for a flow table
> You can register your listener like
> --> core.openflow.addListenerByName("TableStatsReceived", <your handler>)
>
> and your handler can parse..
>
> def <your handler>(event):
>    for item in event.stats
>        print item.wildcards
>
>
> You can find more information by looking at the following classes in POX
> source code (libopenflow_01.py)
>
> class ofp_flow_stats
>
> class ofp_table_stats
>
> ….
>
> Each class has its __init__ function, and you will find all variables for
> stats in the function.
> The variables that you are looking for should be one of them.
> (E.g., wildcards is an initial variable of ofp_table_stats class).
>
> Best,
> Seungwon
>
>
> On Sep 19, 2012, at 11:49 AM, Weiyang Mo <moweiyang1988 at gmail.com> wrote:
>
> Hi,William,
>
> Thanks for your advice and that's what I already did. What I meant is that
> although I sent such request, I don't have ideas how to get the reply back.
> I do modifications as follows in forwarding.l2_learning, which sends
> request right after sending flow entry request.
>
>            msg = of.ofp_flow_mod()
>             msg.match = of.ofp_match.from_packet(packet)
>             msg.match.in_port = packet_in.in_port
>             msg.idle_timeout = 30
>             msg.hard_timeout = 30
>             msg.actions.append(of.ofp_action_output(port = out_port))
>             self.connection.send(msg)
>
> "-----------------------------------------------------"
>            req = of.ofp_flow_stats_request()
>            re = of.ofp_stats_request(body = req)
>            self.connection.send(re)
>
> When I try pinging between hosts, it works correctly and the statistics
> request has been sent. The question is  that the switches sent "stats
> reply back" to controller ( I detect them through wireshark) however from
> controller side, I don't now how to catch the reply packet and parse it as
> I want.
>
> Any advice?
>
> Thanks very much.
>
> Weiyang
>
> 2012/9/19 William Emmanuel Yu <wyu at ateneo.edu>
>
>> Hi Weiyang,
>>
>> Did you check out ofp_flow_stats_request()?
>>
>> import pox.openflow.libopenflow_01 as of
>> fsr = of.ofp_flow_stats_request()
>> sr = of.ofp_stats_request(body = fsr)
>> switch.send(sr)
>>
>> Check out:
>> https://groups.google.com/forum/?fromgroups=#!topic/pox_dev/sSlfqm5Okls
>>
>> Good luck!
>>
>> On Tue, 2012-09-18 at 08:21 -0700, Weiyang Mo wrote:
>> > Hi,All,
>> >
>> > I try to use packet counts from switches within a time period (e.g
>> > 10secs) to do some routing.  In the documentation
>> > https://openflow.stanford.edu/display/ONL/POX
>> > +Wiki#POXWiki-StatisticEvent it mentions that it's possible to do this
>> > using a timer. I guess using 'time to wake' to call a counting
>> > function may help.
>> >
>> > However I'm not famiiar with getting statistics from a switch. More
>> > than one flow, I want to get total packet counts within 10 seconds
>> > from all flow entries. Could you please help to give me a simple
>> > examples about this?
>> >
>> > Thanks very much.
>> >
>> > Best
>> >
>> > Weiyang
>> >
>> >
>>
>> --
>> -------------------------------------------------------
>> William Emmanuel S. Yu, Ph.D. (杨怀义)
>> Department of Information Systems and Computer Science
>> Ateneo de Manila University
>> email  :  wyu at ateneo dot edu
>> blog   :  http://hip2b2.yutivo.org/
>> web    :  http://CNG.ateneo.edu/cng/wyu/ <http://cng.ateneo.edu/cng/wyu/>
>> phone  :  +63(2)4266001 loc. 4186
>> GPG    :  http://CNG.ateneo.net/cng/wyu/wyy.pgp<http://cng.ateneo.net/cng/wyu/wyy.pgp>
>>
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>
>
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