So you're saying your FGT is one of smaller model like FG-xxD/E/F that supports hard-switch and you want to know MAC addresses connected to individual member ports, and you don't have a switch inbetween.
I don't think there is a command to show that, as far as I know. saneeshpv_FTNT's comment below backs up my understanding.
I would just trace the cable to identify the device connected to each port.
Open the Home Network Security app. Tap the Menu icon. Tap Devices, select the device, look for the MAC ID.
Tap Settings.Tap General.Tap About. The MAC address is listed as Wi-Fi Address. [size="1"]vidmate appsave insta video[/size]
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