Примечания к выпуску для Cisco Cisco 2000 Series Wireless LAN Controller
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Release Notes for Cisco wireless LAN controller and Cisco Aironet Lightweight Access Point for Software Release 3.1.59.24
Important Notes
Phone 7920 uses this information to automatically adjust its transmit power to the same level as the
Cisco Aironet lightweight access point to which it is associated. In this manner, both devices are
transmitting at the same level.
Cisco Aironet lightweight access point to which it is associated. In this manner, both devices are
transmitting at the same level.
•
The 7920 phones and the wireless LAN controllers do not currently use compatible fast roaming
mechanisms. The phone uses CCKM while the wireless LAN controllers use Proactive Key Caching
(PKC). To minimize roaming latency, static WEP is the recommended security mechanism.
mechanisms. The phone uses CCKM while the wireless LAN controllers use Proactive Key Caching
(PKC). To minimize roaming latency, static WEP is the recommended security mechanism.
•
When configuring WEP, there is a difference in nomenclature the wireless LAN controller and the
7920 phone. Configure the wireless LAN controller for 104 bits when using 128-bit WEP for the
7920.
7920 phone. Configure the wireless LAN controller for 104 bits when using 128-bit WEP for the
7920.
The Upgrade Process
When a wireless LAN controller is upgraded, the code on the associated Cisco Aironet lightweight
access points is also automatically upgraded. When a Cisco Aironet lightweight access point is loading
code, its lights blink in succession.
access points is also automatically upgraded. When a Cisco Aironet lightweight access point is loading
code, its lights blink in succession.
Caution
Do not power down the wireless LAN controller or any Cisco Aironet lightweight access point during
this process, or you can corrupt the software image!
this process, or you can corrupt the software image!
Upgrading a wireless LAN controller with a large number of Cisco Aironet lightweight access points
can take as long as 30 minutes. The Cisco Aironet lightweight access points must remain powered on
and the wireless LAN controller must not be reset during this time.
can take as long as 30 minutes. The Cisco Aironet lightweight access points must remain powered on
and the wireless LAN controller must not be reset during this time.
Cisco recommends the following sequence when performing an upgrade:
1.
Upload your wireless LAN controller configuration files to a server to back them up.
2.
Turn off the wireless LAN controller 802.11a and 802.11b networks.
3.
Upgrade your wireless LAN controller.
4.
Re-enable your 802.11a and 802.11b networks.
Note
wireless LAN controllers can be upgraded from one release to another. However, if you require a
downgrade from one release to another, you may be unable to use the higher release configuration
(CSCsb79383). The workaround is to reload the previous wireless LAN controller configuration files
saved on the backup server or to reconfigure the wireless LAN controller.
downgrade from one release to another, you may be unable to use the higher release configuration
(CSCsb79383). The workaround is to reload the previous wireless LAN controller configuration files
saved on the backup server or to reconfigure the wireless LAN controller.
Exclusion List (Blacklist) Client Feature
If a client is not able to connect, and the security policy for the wireless LAN and client are correct, the
client has probably been disabled.
client has probably been disabled.
1.
From the Web user interface, access the Monitor page under client summary, and you can see the
client’s status.
client’s status.
2.
If the client is disabled you can just do a “Remove” operation to clear the client from the disabled
list.
list.
3.
The client automatically restores its connection and, if necessary, reattempts authentication.