RED = 随即早期检测

FCT = Flow Completion Times = time from when the first packet of a flow is sent (in TCP, this is the SYN packet) until the last packet is received

INT = In-band Network Telemetry，即in-band网络遥感，in-band指监测在band内（附加在包上）

txRate = output rate, used in HPCC, calculated by txByte (INT内获得的参数，意为transmitted bytes已传输字节)