Specifications

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Cisco Wireless LAN Controller Configuration Guide
OL-21524-02
Chapter 4 Configuring Controller Settings
Configuring Band Selection
show load-balancing
Information similar to the following appears:
Aggressive Load Balancing........................ Enabled
Aggressive Load Balancing Window................. 1 clients
Aggressive Load Balancing Denial Count........... 3
Statistics
Total Denied Count............................... 5 clients
Total Denial Sent................................ 10 messages
Exceeded Denial Max Limit Count.................. 0 times
None 5G Candidate Count.......................... 0 times
None 2.4G Candidate Count........................ 0 times
Step 6 Save your changes by entering this command:
save config
Configuring Band Selection
Band selection enables client radios that are capable of dual-band (2.4- and 5-GHz) operation to move
to a less congested 5-GHz access point. The 2.4-GHz band is often congested. Clients on this band
typically experience interference from Bluetooth devices, microwave ovens, and cordless phones as well
as co-channel interference from other access points because of the 802.11b/g limit of three
nonoverlapping channels. To combat these sources of interference and improve overall network
performance, you can configure band selection on the controller.
Band selection works by regulating probe responses to clients. It makes 5-GHz channels more attractive
to clients by delaying probe responses to clients on 2.4-GHz channels.
Band selection is enabled globally by default.
Note Band-selection enabled WLANs do not support time-sensitive applications like voice and video because
of roaming delays.
Guidelines for Using the Band Selection
Follow these guidelines when using band selection:
• Band selection can be used only with Cisco Aironet 1140 and 1250 Series and the 3500 series access
points.
• Band selection operates only on access points that are connected to a controller. A hybrid-REAP
access point without a controller connection does not perform band selection after a reboot.
Note OEAP 600 Series access points do not support band select.
• The band-selection algorithm directs dual-band clients only from the 2.4-GHz radio to the 5-GHz
radio of the same access point, and it only runs on an access point when both the 2.4-GHz and 5-GHz
radios are up and running.