P
ORT
C
ONFIGURATION
2-29
Configuring Port Mirroring
You can mirror traffic from any source port to a target port for real-time
analysis. You can then attach a logic analyzer or RMON probe to the target
port and study the traffic crossing the source port in a completely
unobtrusive manner.
Command Usage
• The mirror port and monitor port speeds must match, otherwise traffic
may be dropped from the monitor port.
• All mirror sessions have to share the same destination port.
• The source and destination por t have to be either both in the port
group of 1 to 24, 49 or both in the port group of 25 to 48, 50.
Web – Click Port/Mirror. Specify the source port, the traffic type to be
mirrored, and the monitor port, then click “Add.”
CLI – Use the interface command to select the monitor port, then use the
port monitor command to specify the source port . Note that default
mirroring under the CLI is for both received and transmitted packets.
Console(config)#interface ethernet 1/10 3-68
Console(config-if)#port monitor ethernet 1/13 3-135
Console(config-if)#