SDN交换机流表查找过程优化

对于OpenFlow交换机中，多域流表查找与匹配的优化
We should improve the matching algorithm with the following purposes based on MC-SBC:
Decrease the amount of groups and lookup tables and the size of lookup tables to save the memory space.
Reduce the replication ratio and keep high independence of each lookup table even when the fields and size of ruleset increased continuously.
Have a good scalability.