Cisco WIRELESS LAN CONTROLLER OL-17037-01 User Manual download pdf (Page 47)

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Cisco Wireless LAN Controller Configuration Guide

OL-17037-01

Chapter 7 Controlling Lightweight Access Points

Configuring Failover Priority for Access Points

Information similar to the following appears for the show advanced timers command:

Authentication Response Timeout (seconds)........ 10

Rogue Entry Timeout (seconds).................... 1300

AP Heart Beat Timeout (seconds).................. 30

AP Discovery Timeout (seconds)................... 10

AP Local mode Fast Heartbeat (seconds)........... 10 (enable)

AP Hreap mode Fast Heartbeat (seconds)........... disable

AP Primary Discovery Timeout (seconds)........... 120

Configuring Failover Priority for Access Points

Each controller has a defined number of communication ports for access points. When multiple

controllers with unused access point ports are deployed on the same network and one controller fails, the

dropped access points automatically poll for unused controller ports and associate with them.

In controller software releases prior to 5.1, the backup controllers accept association requests in the

order the requests are received until all the ports are in use. As a result, the probability of an access point

finding an open port on a backup controller is determined by where in the association request queue it

is after the controller failure.

In controller software release 5.1 or later, you can configure your wireless network so that the backup

controller recognizes a join request from a higher-priority access point and if necessary disassociates a

lower-priority access point as a means to provide an available port.

Note Failover priority is not in effect during the regular operation of your wireless network. It takes effect only

if there are more association requests after a controller failure than there are available backup controller

ports.

To configure this feature, you must enable failover priority on your network and assign priorities to the

individual access points. You can do so using the controller GUI or CLI.

By default, all access points are set to priority level 1, which is the lowest priority level. Therefore, you

need to assign a priority level only to those access points that warrant a higher priority.

Using the GUI to Configure Failover Priority for Access Points

Using the controller GUI, follow these steps to configure failover priority for access points that join the

controller.

Step 1 Click Wireless > Access Points > Global Configuration to open the Global Configuration page

(see Figure 7-16).

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Cisco WIRELESS LAN CONTROLLER OL-17037-01 User Manual Page 47