controller switch-statement default mininet openflow

How do you deal with a No default OpenFlow controller found for default switch?

*** No default OpenFlow controller found for default switch!

Solution

Mininet uses Open vSwitch controller as the default controller, if you omit --controller option.
If your system/virtual machine does not have it installed, mn command will generate that warning.
Install ovs-controller or just use --controller=remote to add external controller, like NOX/POX/ODL.

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