Hi,
I use Ryu framework for controlling a simple network included 3 switches and 
5 hosts with tree topology that i implemented in mininet.
I have packet_in_event to my controller from switches that haven’t miss 
table flow entry, why?
Also, I have packet_in_event to my controller even when I don’t generate 
any traffic to my network, why? Is there any packet traversal in Ryu 
framework in default? If yes, how can I ignore this packet traversal?

h1 ----- s1
/\
s2        s3
/\           /\
h2   h3   h4   h5

Thank you
...................................................
 mehran shetabi
 PhD student
 Computer Engineering Department
 IUST
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