Hirschmann RS20 Reference Manual page 195

Diagnostics
The PowerMICE and MACH4000 devices use the destination port for the port
mirroring task exclusively. The source port forwards and receives traffic as
normal.
 Select the source ports whose data traffic you want to review from the
physical ports list by checkmarking the relevant boxes.
The device displays the "Source Port" currently used as the "Destination
Port" as grayed out in the table. Default setting: no source ports.
 Select the destination port to which you have connected your
management tool from the drop-down menu in the "Destination Port"
frame.
Selecting a destination port is mandatory for a valid port mirroring
configuration. The drop-down menu displays available ports exclusively,
for example, the list excludes the ports currently in use as source ports.
Default setting: port - (no destination port).
 To select the monitoring traffic direction, checkmark the relevant "RX" and
"TX" boxes for ingress and egress monitoring directions.
 To switch on the function, select On in the "Operation" frame. Default
setting: Off.
RM GUI L2E
Release 8.0 05/2013
7.5 Port Mirroring
195