This read-only PerfCounter64 reports the maximum probe-to-reflector (Forward) Frame Delay Range, in microseconds, observed during the current measurement interval, per its description, capturing how much delay varied from its minimum in the outbound direction. An administrator watches this to spot the worst delay-variation spike specifically on the forward path. For example, a high f3EsaProbeStatsSoamPmExtMaxP2RFDR alongside a normal average FDR would point an operator toward an intermittent forward-path delay excursion rather than a steady baseline shift.