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9–2 MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL
PORT MIRRORING AND SETUP CHAPTER 9: PORT MIRRORING AND SETUP
9.2 Port Mirroring using the Command Line Interface
Monitoring a specific port can be done by port mirroring. Mirroring traffic from one port to
another port allows analysis of the traffic on that port.
show port-mirror command displays the status of port mirroring:
port-mirror command enters the port mirror configuration mode.
setport monitor command configures a port mirror.
setport monitor=<monitor port number> sniffer=<sniffer port number>
prtmr command enables and disables port mirroring.
The sequence below illustrates how port 1 is mirrored on port 2. Any traffic on port 1 is also
sent on port 2.
ML1200# show port-mirror
Sniffer Port: 0
Monitor Port: 0
Mirroring State: disabled
setport monitor=1 sniffer=2
Port 1 set as Monitor Port
Port 2 set as Sniffer Port
ML1200(port-mirror)## prtmr enable
Port Mirroring Enabled
Sniffer Port: 2
Monitor Port: 1
Mirroring State: enabled
Once port monitoring is completed, GE strongly recommends that the port mirroring be
disabled using the
prtmr disable command for security reasons.
1. Only one port can be set to port mirror at a time.
2. Both the ports (monitored port and mirrored port) have to belong to the same
3. The mirrored port shows both incoming as well as outgoing traffic