This read-only Unsigned32 gives the maximum value observed for a monitored parameter, for the specific interface and interval identified by the same table row. An admin uses this alongside the current and minimum values to see the peak the parameter reached during that sampling window, useful for spotting spikes such as traffic bursts. For example, an hpicfInstParamValMax of 92 alongside a current value of 47 shows the parameter spiked as high as 92 percent utilization during the interval.