Cisco Cisco Access Registrar 4.2 Especificaciones descargar pdf (Pagina 294)

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Cisco Wireless LAN Controller Configuration Guide

OL-13826-01

Chapter 6 Configuring WLANsWireless Device Access

Configuring WLANs

Additional Guidelines for Using 7921 and 7920 Wireless IP Phones

Follow these guidelines to use Cisco 7921 and 7920 Wireless IP Phones with controllers:

• Aggressive load balancing must be disabled for each controller. Otherwise, the initial roam attempt

by the phone may fail, causing a disruption in the audio path.

• The Dynamic Transmit Power Control (DTPC) information element (IE) must be enabled using the

config 802.11b dtpc enable command. The DTPC IE is a beacon and probe information element

that allows the access point to broadcast information on its transmit power. The 7921 or 7920 phone

uses this information to automatically adjust its transmit power to the same level as the access point

to which it is associated. In this manner, both devices are transmitting at the same level.

• Both the 7921 and 7920 phones and the controllers support Cisco Centralized Key Management

(CCKM) fast roaming.

• When configuring WEP, there is a difference in nomenclature for the controller and the 7921 or 7920

phone. Configure the controller for 104 bits when using 128-bit WEP for the 7921 or 7920.

• For standalone 7921 phones, load-based CAC must be enabled, and the WMM Policy must be set to

Required on the WLAN.

• When using a 7921 phone with the 802.11a radio of a 1242 series access point, set the 24-Mbps data

rate to Supported and choose a lower Mandatory data rate (such as 12 Mbps). Otherwise, the phone

might experience poor voice quality.

Using the GUI to Configure QBSS

Using the controller GUI, follow these steps to configure QBSS.

Step 1 Click WLANs to open the WLANs page.

Step 2 Click the name of the WLAN for which you want to configure WMM mode.

Step 3 When the WLANs > Edit page appears, click the QoS tab to open the WLANs > Edit (Qos) page (see

Figure 6-11).

Figure 6-11 WLANs > Edit (QoS) Page

Step 4

From the WMM Policy drop-down box, choose one of the following options, depending on whether you

want to enable WMM mode for 7921 phones and other devices that meet the WMM standard:

• Disabled—Disables WMM on the WLAN. This is the default value.

• Allowed—Allows client devices to use WMM on the WLAN.

• Required—Requires client devices to use WMM. Devices that do not support WMM cannot join

the WLAN.

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