Cisco Cisco 4402 Wireless LAN Controller

The Cisco 4400 Series Controllers are on the NIST FIPS 140-2 Pre-Validation List.

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).

Cisco recommends that load balancing always be turned off in any wireless LAN 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.

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.

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.