Cisco Cisco 2000 Series Wireless LAN Controller

This section describes important information about the controllers and access points.

You must install software release 4.0.155.0 on the controller before connecting 1100 and 1300 series 
access points to the controller.

To support access points configured for use in Japan, you must upgrade the controller software to release 
3.2.116.21 or later. Earlier releases do not support access points configured for use in Japan (regulatory 
domain -P).

To prevent or block a wired or wireless client from accessing the management network on a controller 
(from the wireless client dynamic interface or VLAN), the network administrator should ensure that 
there is no route through which to reach the controller from the dynamic interface or use a firewall 
between the client dynamic interface and the management network.

Cisco recommends that load balancing always be turned off in any wireless network that is supporting 
voice, regardless of vendor. When load balancing is turned on, voice clients can hear an audible artifact 
when roaming, and the handset is refused at its first reassociation attempt.

Currently, multicast traffic cannot be passed during inter-subnet roaming.

In mesh networks that operate through low-speed switches and routers, access points can disconnect 
from the controller, causing the controller to generate alerts.