The range for configuring rate-limit in packet per second (pps). A value of -1 means no-limit and all packets of specified type will not be controlled. the default value is no-limit. The rate values are 0 to N. When 0 is set on the specified type, all packets of the specified type will be dropped.The value N means the maximum rate which is project dependent.If the specific packet that sends to the CPU exceeds the above rate,it will be dropped.
Sources for this description
D-Link official switch MIBsD-Link MIB copies (LibreNMS/Observium Community)