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As per ONOS's openflow driver (provider/of/device/impl/, the polling frequency is set to 5 seconds.

Hence you might need to understand that the B/W measurement depends on this 5 seconds polling intervals. 
If incase you are trying to match the B/W data with external observer data ( like iperf for example ), 
you might need to fix the probing interval of that observer as well to 5 seconds.