Controller Based WLANs

Can channel reuse and interference immunity be used at the same time?

Aruba Employee

Product and Software: This article applies to all Aruba controllers and ArubaOS or later.

Two knobs in the RF dot11g radio profile are somewhat related:

  • channel reuse
  • interference immunity

Channel reuse is designed for cases where co-channel interference (CCI) might occur. Large conference rooms or school auditoriums are examples. These dense AP deployments are likely to have multiple APs within hearing distance of each other that can be on the same channel. This is particularly likely in 2.4 GHz environments with a normal 3-channel plan using channels 1, 6, and 11.

Interference immunity is designed for cases where many non-802.11 interference sources are present. Possible non-802.11 interference sources include Bluetooth devices, analog and digital video cameras, DECT headsets, and microwaves. Many devices take advantage of the freely available spectrum in the 2.4 GHz band.

Interference immunity is available only in the RF dot11g radio profile, because it is designed specifically to work with the non-802.11 interference sources that commonly operate in the 2.4 GHz band.

The channel reuse and interference immunity knobs are NOT designed to operate together. They are mutually exclusive, because they affect the radios receive sensitivity in specific ways, and modifying one knob can easily change the effectiveness of the other knob.

So use channel reuse OR interference immunity on the 2.4 GHz band.

When using either knob, contact Aruba support for configuration guidelines and for suggestions on what values have worked in particular situations.


Channel reuse is also available in the 5.0 GHz band in the RF dot11a radio profile. Interference immunity is available only in the 2.4 GHz band.

For information about configuring channel reuse and interference immunity, see the user guides on the Aruba support web page.

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Last update:
‎07-03-2014 03:32 AM
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