Allows Smart-RF enabled radios to avoid channels with high levels of interference and channels where radar has been detected

This command configures the interval for which a channel is avoided on detection of interference or radar, and is applicable only if the channel selection mode is set to Smart and a Smart-RF policy is applied to the access point‘s RF Domain. For more information on configuring a radio‘s channel of operation, see channel.

Certain 5.0 GHz channels are subject to FCC / ETSI DFS regulations that require channels transmitting critical radar signals to be free of interference from radio signals. Consequently, DFS-enabled 5.0 GHz radios scan and switch channels if radar is detected on their current channel of operation. If radar-free channels are not available, the radio stops transmitting until it identifies a radar-free channel.

Adaptivity is a new EU (European Union) stipulation that requires access points to monitor interference levels on their current channel of operation, and stop functioning on channels with interference levels exceeding ETSI-specified threshold values. When enabled, this feature ensures recovery by switching the radio to a new channel with less interference.

Once adaptivity or DFS is triggered, the radio‘s channel is switched based on the channel selection mode specified. If the channel is fixed, the radio attempts to come back to its specified channel of operation after the DFS/adaptivity channel evacuation period has expired.



To optionally disable the radio from switching back to its original channel of operation, execute the no > dfs-rehome command in the radio interface configuration mode of the access point‘s profile or device. For more information, see dfs-rehome.


For radio‘s with channel selection mode set to ACS, Random, or Fixed adaptivity timeout can be configured in the access point‘s radio interface mode. For more information, see adaptivity.

On the other hand, if the radio‘s channel selection mode is set to Smart or ACS, once adaptivity or DFS is triggered, the channel is avoided until the avoidance-time, specified here, expires. Once the evacuation period has expired, the channel is free for use by both Smart-RF and ACS.

Supported in the following platforms:

  • Access Points — AP505i, AP510i/e, AP560i/h
  • Service Platforms — NX5500, NX7500, NX9500, NX9600, VX9000


avoidance-time [adaptivity|dfs] <30-3600>


avoidance-time [adaptivity|dfs] <30-3600>
avoidance-time [adaptivity|dfs] <30-3600> Configures the time for which a channel is avoided after dfs or adaptivity is triggered
  • adaptivity – Sets the time, in minutes, for which a radio avoids an adaptivity-regulated channel detected with interference
  • dfs – Sets the time, in minutes, for which a radio avoids a DFS-regulated channel detected on radar
    • <30-3600> – Specify a value from 30 - 3600 minutes. The default for both parameters is 90 minutes.


nx9500-6C8809(config-smart-rf-policy-test)#avoidance-time adaptivity 200
nx9500-6C8809(config-smart-rf-policy-test)#avoidance-time dfs 300
nx9500-6C8809(config-smart-rf-policy-test)#show context
smart-rf-policy test
 assignable-power 2.4GHz max 20
 assignable-power 2.4GHz min 8
 area test channel-list 2.4GHz 1,2,3
 avoidance-time dfs 300
 avoidance-time adaptivity 200
nx9500-6C8809(config-smart-rf-policy-test)#no avoidance-time adaptivity
nx9500-6C8809(config-smart-rf-policy-test)#show context include-factory | include avoidance-time
 avoidance-time dfs 300
 avoidance-time adaptivity 90

Related Commands

no (smart-rf-policy-config-mode-command) Reverts the DFS/adaptivity regulated channel avoidance time to default (90 minutes)