Milan Technology MIL-SM2401M-STK - Manual (Page 187)

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7-4-9. Port Mirroring
The Port Mirroring feature is disabled by default. Selecting enable from the pull
down menu will cause the selected traffic from the selected monitor ports to be
mirrored to the selected analysis port. Press the Apply button to submit the
changes.
Port Mirroring State: Enables or Disables the port mirroring function.