Important Notes
Heavily Loaded Controller CPU
When the controller CPU is heavily loaded (for example, when doing file copies or other tasks), it does not have time to process all of the ACKs that the NPU sends in response to configuration messages. When this happens, the CPU generates error messages. However, the error messages do not impact service or functionality.
RADIUS Servers and the Management VLAN
The RADIUS server can be on any subnet as long as it can be reached by the management VLAN subnet.
The controllers can be managed via the management VLAN subnet from any other subnet that can reach the management VLAN subnet.
Cisco 7920 Wireless IP Phone Support
When using Cisco 7920 Wireless IP Phones with controllers, make sure that the phones and controllers are configured as follows:
•Aggressive load balancing must be disabled on a
•The QoS Basis Service Set (QBSS) information element (IE) must be enabled. The QBSS IE enables the access points to communicate their channel usage to wireless devices. Because access points with high channel usage might not be able to handle
–sh wlan summary
Note Use this command to determine the WLAN ID number of the WLAN to which you want to add QBSS support.
–config wlan disable wlan_id_number
–config wlan
–config wlan enable wlan_id_number
–sh wlan wlan_id_number
Note Use this command to verify that the WLAN is enabled and the
–save config
•The Dynamic Transmit Power Control (DTPC) information element (IE) must be enabled using the config 802.11a 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 Cisco 7920 Wireless IP 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.
Release Notes for Cisco Wireless LAN Controllers and Lightweight Access Points for Release 3.2.171.6
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