Cisco Cisco 2106 Wireless LAN Controller

Personnel installing the controllers and access points must understand wireless techniques and 
grounding methods. Access points with internal antennas can be installed by an experienced IT 
professional.

The controller must be installed by a network administrator or qualified IT professional, and the proper 
country code must be selected. Following installation, access to the controller should be password 
protected by the installer to maintain compliance with regulatory requirements and ensure proper unit 
functionality.

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

One Time Passwords (OTP) are supported on the Wireless Lan Controller (WLC) using TACACS and 
RADIUS. In this configuration, the controller acts as a transparent pass-thru device. The controller 
forwards all client requests to the TACACS/RADIUS server without inspecting the client behavior.  
When using OTP the client must only establish a single connection to the controller to function properly.  
The controller currently does not have any intelligence or checks to correct a client that is trying to 
establish multiple connections.

When clients use the controller’s internal DHCP server, IP addresses are not preserved across reboots. 
As a result, multiple clients can be assigned the same IP address. To resolve any IP address conflicts, 
clients must release their existing IP address and request a new one.

The 1250 series access points may contain either an old bootloader or a new bootloader. Those with an 
old bootloader do not generate a crash log when a crash occurs. The crash log is disabled so that a crash 
does not corrupt the flash file system. Those with a new bootloader generate a crash log if the access 
point is running controller software release 4.2.112.0 or later.

New 1250 series access points shipped from the factory contain the new bootloader image, which fixes 
the flash file system after it is corrupted during a crash (without losing files). This new bootloader 
automatically sets a new CRASH_LOG environment variable to “yes,” which enables a crash log to be 
generated following a crash but only on controllers running software release 4.2.112.0 or later. 
Therefore, no user configuration is needed to enable a crash log on new 1250 series access points shipped 
from the factory.