Attendre: Mitigating ill effects of race conditions in OpenFlow via queueing mechanism

According to the specification of the OpenFlow protocol, whenever a flow table entry is absent for any arriving data packet, a packet-in message is sent to the controller. This behaviour results in various types of race conditions in accord with various packet and message orderings. Increased forwarding delay of data packets, increased complexity in performing software verification, and increased load on switch and controller processors are the ill effects of these races.