Hi
1. If "load" you mentioned is "traffic load", you can send
ofp_port_stats_request (openflow 1.3.4 spec, page 94) and calculate port
loading by port stats information.
2. If you mean "controller loading", just use other library like psutil
https://github.com/giampaolo/psutil
3. You need to implement your communication protocol between controllers,
for example: use tcp socket connection.
BTW, mininet supports multiple controller, just assign two remote
controller, for example:
https://github.com/TakeshiTseng/SDN-Work/blob/master/mininet/single/two_controller.py
Yi
2015-05-08 10:30 GMT+08:00 FUJITA Tomonori <[email protected]>:
> Please don't drop the mailing list,
>
> On Thu, 07 May 2015 22:46:20 +0430
> "mehran shetabi" <[email protected]> wrote:
>
> > I mean that is there any class, method, command, library, or event
> manager
> > in Ryu documentation for measuring instant load of any host that
> connected
> > to OVS, and instant load of a controller?
>
> There isn't.
>
> > I know that there is ofp_event.EventOFPPortStatsReply in Ryu
> documentation,
> > but it measures the cumulative load of a port (rx_packets, rx_bytes,
> > tx_packets, tx_bytes, …) in a switch that connected to the host, but not
> > to the controller.
> >
> > Also, how can I implement master, slave, and equal controllers for a
> switch
> > in Mininet and program them with the Ryu which they control the switch
> for
> > acting like a simple_switch_13, for example?
>
> Try OFPRoleRequests:
>
>
> http://ryu.readthedocs.org/en/latest/ofproto_v1_3_ref.html#role-request-message
>
> I don't know if mininet supports multiple controllers though.
>
>
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--
-----
Yi Tseng (a.k.a Takeshi)
Taiwan National Chiao Tung University
Department of Computer Science
W2CNLab
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