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

[Weiyang Mo]

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/
> phone  :  +63(2)4266001 loc. 4186
> GPG    :  http://CNG.ateneo.net/cng/wyu/wyy.pgp
>
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