+ ryu_path = python_install_path + '/ryu/app/simple_switch_13.py'\r
+ ryu_path2 = python_install_path + '/ryu/app/ofctl_rest.py'\r
+ # change the default Openflow controller port to 6653 (official IANA-assigned port number), as used by Mininet\r
+ # Ryu still uses 6633 as default\r
+ ryu_option = '--ofp-tcp-listen-port'\r
+ ryu_of_port = '6653'\r