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Among several communication protocols employed for SDN, OpenFlow is most widely used for the communication between the controller and switch. In this paper two packet scheduling schemes, FCFS\u2010Pushout (FCFS\u2010PO) and FCFS\u2010Pushout\u2010Priority (FCFS\u2010PO\u2010P), are proposed to effectively handle the overload issue of multiple\u2010switch SDN targeting the edge computing environment. Analytical models on their operations are developed, and extensive experiment based on a testbed is carried out to evaluate the schemes. They reveal that both of them are better than the typical FCFS\u2010Block (FCFS\u2010BL) scheduling algorithm in terms of packet wait time. 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