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9–2 MULTILINK ML1600 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL
PORT MIRRORING USING THE COMMAND LINE INTERFACE CHAPTER 9: PORT MIRRORING AND SETUP
9.2 Port mirroring using the Command Line Interface
9.2.1 Commands
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.
The
show port-mirror command displays the status of port mirroring:
show port-mirror
The
port-mirror command enters the port mirror configuration mode.
port-mirror
The
setport monitor command configures a port mirror.
setport monitor=<monitor port number> sniffer=<sniffer port number>
The
prtmr command enables and disables port mirroring.
prtmr <enable|disable>
The sequence below illustrates how port 11 is mirrored on port 13. Any traffic on port 11 is
also sent on port 13.
ML1600# show port-mirror
Sniffer Port: 0
Monitor Port: 0
Mirroring State: disabled
ML1600# port-mirror
ML1600(port-mirror)##
setport monitor=11 sniffer=13
Port 11 set as Monitor Port
Port 13 set as Sniffer Port
ML1600(port-mirror)## prtmr enable
Port Mirroring Enabled
ML1600(port-mirror)## exit
ML1600#
show port-mirror
Sniffer Port: 13
Monitor Port: 11
Mirroring State: enabled
ML1600#
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
VLAN.
3. The mirrored port shows bout incoming as well as outgoing traffic.