I am using ODL helium SR2. It uses OPenflow13. When I add hosts and switches from mininet, I could see strange flows in "sudo ovs-ofctl dump-flows s1". And if I try pinginh h1 anf h2 in mininet ">h1 ping h2" , straight away they are pinging without me adding any static flows. I could see those flows too in dump-flows after that.

What creates these default flows? How can i remove them???

Thanks in advance.