Milan Technology MIL-SM2401M-STK - Manual (Page 188)

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Enabled states include RX, TX or Both.
Analysis Port: All mirrored traffic is sent out this port.
Monitor Port: The ports you want to mirror. All source port traffic will be copied
to a mirror port. You can select a maximum of 25 source ports in the switch. If
you want to disable the function, you must select monitor port to none.