The present disclosure relates to the field of communications technologies. The method in embodiments of the present disclosure includes: determining a destination switch for service migration when a flow table capacity of a source switch is greater than a specified threshold; generating an equivalent flow entry that is equivalent to each initial flow entry of at least two initial flow entries stored in the source switch, and delivering each generated equivalent flow entry to the destination switch, where an equivalent flow entry that is equivalent to any initial flow entry is used by the destination switch to process a data packet that matches the any initial flow entry and that is forwarded by the source switch; and generating an aggregated flow entry by aggregating the at least two initial flow entries, and delivering the aggregated flow entry to the source switch.