<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">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:<div><br></div><div>fm = of.ofp_flow_mod()</div><div>...</div><div>fm.command = of.OFPFC_MODIFY_STRICT</div><div>...</div><div>connection.send(fm)<br><div><br></div><div><br></div><div>-- Murphy</div><div><br><div><div>On Dec 15, 2013, at 10:16 PM, Sadia Bashir <<a href="mailto:11msccssbashir@seecs.edu.pk">11msccssbashir@seecs.edu.pk</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><div><div><div>Thank you Junaid Khalid and Murphy!<br><br></div>I just got this from pox.openflow.libopenflow_o1<br><br>ofp_flow_mod_command_rev_map = {<br> 'OFPFC_ADD' : 0,<br> 'OFPFC_MODIFY' : 1,<br>
'OFPFC_MODIFY_STRICT' : 2,<br> 'OFPFC_DELETE' : 3,<br> 'OFPFC_DELETE_STRICT' : 4,<br>}<br><br><br></div>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!<br>
<br></div>sadia<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Dec 16, 2013 at 7:20 AM, Murphy McCauley <span dir="ltr"><<a href="mailto:murphy.mccauley@gmail.com" target="_blank">murphy.mccauley@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Dec 14, 2013, at 1:56 PM, Sadia Bashir <<a href="mailto:11msccssbashir@seecs.edu.pk">11msccssbashir@seecs.edu.pk</a>> wrote:<br>
<br>
> Hi,<br>
><br>
> 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:<br>
><br>
> def _timer_func ():<br>
> for connection in core.openflow._connections.values():<br>
> connection.send(of.ofp_action_nw_tos(port = 1, queue_id = 2))<br>
<br>
</div>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.<br>
<div class="im"><br>
> def launch():<br>
> from pox.lib.recoco import Timer<br>
> Timer(4, _timer_func, recurring=True)<br>
><br>
> Please tell me if there is a way to modify a value in already existing flow entries on the switch.<br>
><br>
> Thanks in advance for any hint or help.<br>
> --<br>
> sadia<br>
<br>
</div>Hope that helps.<br>
<span class="HOEnZb"><font color="#888888"><br>
— Murphy</font></span></blockquote></div><br><br clear="all"><br>-- <br><div><font color="#3366ff"><br></font></div><div><font color="#3366ff"></font> </div>
</div>
</blockquote></div><br></div></div></body></html>