This read-only field reports the ifIndex of the physical output port the switch will use to forward traffic matching this cached station FFT entry. An administrator uses this to confirm which physical interface a specific host's fast-path traffic is actually egressing through. For example, if a host's traffic seems to be taking an unexpected path, checking rlInetFftStnOutIfIndex against the expected uplink's ifIndex confirms whether the FFT cache is directing it correctly.