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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.
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.
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.
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.
Confirm whether access point failover priority is enabled on your network by entering this command:
Information similar to the following appears:
RF-Network Name............................. mrf Web Mode.................................... Enable Secure Web Mode............................. Enable Secure Web Mode Cipher-Option High.......... Disable Secure Shell (ssh).......................... Enable Telnet...................................... Enable Ethernet Multicast Mode..................... Disable Ethernet Broadcast Mode..................... Disable IGMP snooping............................... Disabled IGMP timeout................................ 60 seconds User Idle Timeout........................... 300 seconds ARP Idle Timeout............................ 300 seconds Cisco AP Default Master..................... Disable AP Join Priority......................... Enabled ...
See the failover priority for each access point by entering this command:
Information similar to the following appears:
Number of APs.................................... 2 Global AP User Name.............................. user Global AP Dot1x User Name........................ Not Configured AP Name Slots AP Model Ethernet MAC Location Port Country Priority ------- ----- ------------------ ----------------- --------- ---- ------- ------- ap:1252 2 AIR-LAP1252AG-A-K9 00:1b:d5:13:39:74 hallway 6 1 US 1 ap:1121 1 AIR-LAP1121G-A-K9 00:1b:d5:a9:ad:08 reception 1 US 3
To see the summary of a specific access point, you can specify the access point name. You can also use wildcard searches when filtering for access points.