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Cisco Wireless LAN Controller Configuration Guide
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Chapter 3 Configuring Ports and Interfaces
Configuring Ports
Configuring Port Mirroring
Mirror mode enables you to duplicate to another port all of the traffic originating from or terminating at
a single client device or access point. It is useful in diagnosing specific network problems. Mirror mode
should be enabled only on an unused port as any connections to this port become unresponsive.
Note The 2000 and 2100 series controllers, controller network modules, and Cisco WiSM controllers do not
support mirror mode. Also, a controller’s service port cannot be used as a mirrored port.
Note Port mirroring is not supported when link aggregation (LAG) is enabled on the controller.
Note Cisco recommends that you do not mirror traffic from one controller port to another as this setup could
cause network problems.
Follow these steps to enable port mirroring.
Step 1 Click Controller > Ports to open the Ports page (see Figure 3-9).
Step 2 Click the number of the unused port for which you want to enable mirror mode. The Port > Configure
page appears (see Figure 3-10).
Step 3 Set the Mirror Mode parameter to Enable.
Step 4 Click Apply to commit your changes.
Step 5 Perform one of the following:
• Follow these steps if you want to choose a specific client device that will mirror its traffic to the port
you selected on the controller:
a. Click Wireless > Clients to open the Clients page.
b. Click the MAC address of the client for which you want to enable mirror mode. The Clients >
Detail page appears.
c. Under Client Details, set the Mirror Mode parameter to Enable.
• Follow these steps if you want to choose an access point that will mirror its traffic to the port you
selected on the controller:
a. Click Wireless > All APs to open the All APs page.
b. Click the name of the access point for which you want to enable mirror mode. The All APs >
Details page appears.
c. Under General, set the Mirror Mode parameter to Enable.
Step 6 Click Save Configuration to save your changes.
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