Configuring Failover Priority

As discussed last time, the failover priority feature has been available since controller firmware version 5.1 but is disabled by default. Since it only engages when the controller sees additional association requests over and over again (meaning that the access points can’t find a controller with capacity for them to join) it makes sense to set up failover priority; it does not affect your regular day-to-day wireless network.

Failover priority can be configured on the controller using command line or the graphical user interface. Below you will find and example of how to configure failover priority using the command line interface. Follow these steps to configure failover priority for access points that join the controller.

Step 1: To enable or disable access point failover priority, enter the config network ap-priority {enable | disable} command

Step 2: To specify the priority of an access point, enter this command, where 1 is the lowest priority level (and the default value) and 4 is the highest priority level.

config ap priority {1 | 2 | 3 | 4} Cisco_AP MAC Address

Step 3: To save your changes, enter the save config command

Use the show network summary command to see if the failover priority feature is enabled or disabled on the controller and 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

Use the show ap summary command to view the failover priority for each access point and 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:1252-1    2    AIR-LAP1252AG-A-K9  00:1b:e5:13:59:64   meeting    1       US      1
ap:1252-2    1    AIR-LAP1252AG-A-K9  00:1e:d7:b9:ad:07   shipping   1       US      3

References:

  • Cisco Wireless LAN Controller Configuration Guide, Software Release 6.0, November 2009, Page 507

Guest Author: Dennis Nofsinger, Senior Wireless Training Specialist, Gigawave Technologies

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