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Cisco Wireless LAN Controller Configuration Guide
OL-9141-03
Chapter 4 Configuring Controller SettingsWireless Device Access
Configuring Voice and Video Parameters
3. To view the roaming history for a particular client, enter this command:
show client roam-history client_mac
This command provides the following information:
–
The time when the report was received
–
The MAC address of the access point to which the client is currently associated
–
The MAC address of the access point to which the client was previously associated
–
The channel of the access point to which the client was previously associated
–
The SSID of the access point to which the client was previously associated
–
The time when the client disassociated from the previous access point
–
The reason for the client roam
To obtain debug information for CCX Layer 2 client roaming, enter this command:
debug l2roam {detail | error | packet | all} enable
Configuring Voice and Video Parameters
You can configure two parameters on the controller that affect voice and/or video quality:
• Call admission control
• Unscheduled automatic power save delivery
You can also configure the traffic stream metrics parameter to monitor voice and video quality.
Each of these parameters is supported in Cisco Compatible Extensions (CCX) v4. See the “Configuring
Cisco Client Extensions” section on page 6-22 for more information on CCX.
Note CCX is not supported on the AP1030.
Call Admission Control
Call admission control (CAC) enables an access point to maintain controlled quality of service (QoS)
when the wireless LAN is experiencing congestion. The Wi-Fi Multimedia (WMM) protocol deployed
in CCX v3 ensures sufficient QoS as long as the wireless LAN is not congested. However, in order to
maintain QoS under differing network loads, CAC in CCX v4 is required.
CAC enables the client to specify how much bandwidth or shared medium time would be required to
accept a new call and in turn enables the access point to determine whether it is capable of
accommodating this particular call. The access point rejects the call if necessary in order to maintain the
maximum allowed number of calls with acceptable quality.
The QoS setting for a WLAN determines the level of CAC support. To use CAC with voice applications,
the WLAN must be configured for Platinum QoS. To use CAC with video applications, the WLAN must
be configured for Gold QoS. Also, make sure that WMM is enabled for the WLAN. See the “Configuring
Quality of Service” section on page 6-17 for QoS and WMM configuration instructions.
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