C
ONFIGURING
P
ORT
M
IRRORING
8-25
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
• Monitor port speed should match or exceed source port speed,
otherwise traffic may be dropped from the monitor port.
• All mirror sessions have to share the same destination port.
• When mirroring port traffic, the target port must be included in the same
VLAN as the source port when using MSTP (see “Spanning Tree
Algorithm” on page 10-1).
Command Attributes
• Mirror Sessions – Displays a list of current mirror sessions.
• Source Unit – The unit whose port traffic will be monitored.
(Range: 1-8)
• Source Port – The port whose traffic will be monitored.
(Range: 1-26/50)
• Type – Allows you to select which traffic to mirror to the target port, Rx
(receive), Tx (transmit), or Both. (Default: Rx)
• Target Unit – The unit whose port will "duplicate" or "mirror" the
traffic on the source port. (Range: 1-8)
• Target Port – The port that will “mirror” the traffic from the source
port. (Range: 1-26/50)
Source
port(s)
Single
target
port
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