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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am new to open flow and SDN.<o:p></o:p></p>
<p class="MsoNormal">I have certain queries regarding dpctl utility.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I executed dpctl utility from mininet VM as “dpctl dump-flows” after creating topology it gives me details of all switches.<o:p></o:p></p>
<p class="MsoNormal">But when I tried to execute dpctl utility from mininet terminal as “dpctl dump-flows tcp:127.0.0.1:6633” it gives me following error at controller<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[openflow.of_01 ] [None 3]: Exception while handling OpenFlow message:<o:p></o:p></p>
<p class="MsoNormal">[None 3] ofp_stats_request<o:p></o:p></p>
<p class="MsoNormal">[None 3] header:<o:p></o:p></p>
<p class="MsoNormal">[None 3] version: 1<o:p></o:p></p>
<p class="MsoNormal">[None 3] type: 16 (OFPT_STATS_REQUEST)<o:p></o:p></p>
<p class="MsoNormal">[None 3] length: 56<o:p></o:p></p>
<p class="MsoNormal">[None 3] xid: 142127887<o:p></o:p></p>
<p class="MsoNormal">[None 3] type: 1<o:p></o:p></p>
<p class="MsoNormal">[None 3] flags: 0<o:p></o:p></p>
<p class="MsoNormal">[None 3] body:<o:p></o:p></p>
<p class="MsoNormal">[None 3] match:<o:p></o:p></p>
<p class="MsoNormal">[None 3] wildcards: nw_tos|tp_dst|dl_dst|dl_src|in_port|dl_vlan_pcp|nw_proto|dl_vlan|tp_src|dl_type|nw_src(/0)|nw_dst(/0) (1110000010000011111111 = 3820ff)<o:p></o:p></p>
<p class="MsoNormal">[None 3] table_id: 255<o:p></o:p></p>
<p class="MsoNormal">[None 3] out_port: 65535<o:p></o:p></p>
<p class="MsoNormal">Traceback (most recent call last):<o:p></o:p></p>
<p class="MsoNormal"> File "/home/mininet/pox/pox/openflow/of_01.py", line 749, in read<o:p></o:p></p>
<p class="MsoNormal"> h(self, msg)<o:p></o:p></p>
<p class="MsoNormal">TypeError: 'NoneType' object is not callable<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Would appreciate any pointers to resolve this. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards<o:p></o:p></p>
<p class="MsoNormal">Priyanka<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;color:#1F497D">Thanks & Regards<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;color:#1F497D">Priyanka Chauhan | Software Engineer– Telecom & Media<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><u><span style="font-size:9.0pt;color:#1F497D"><a href="mailto:Priyanka_chauhan@persistent.co.in"><span style="color:blue">Priyanka_chauhan@persistent.co.in</span></a>
</span></u></b><b><span style="font-size:9.0pt;color:#1F497D">| Cell: +91-7385753269 | Tel: +91-712-6692455<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;color:#1F497D">Persistent Systems</span></b><b><span style="font-size:9.0pt;color:black"> Ltd.
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