Zero Wait Dynamic Frequency Selection

Information About Zero Wait Dynamic Frequency Selection

Access points (APs) monitor and perform Channel Availability Check (CAC) on a potential channel for 60 seconds when AP moves to Dynamic Frequency Selection (DFS) channels. Further, the AP ensures that there is no radar operating in the same frequency range before advertising beacons and serving clients. When the AP moves to a DFS, there is a service outage for a minute. This outage can be higher and extend up to 10 minutes. The Zero Wait Dynamic Frequency Selection feature helps to avoid the service outage in regulatory domains. As of now, U.S. and Europe are the only supported domains.

Configuring Zero Wait Dynamic Frequency Selection Globally (CLI)

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 2

ap dot11 5ghz rrm channel zero-wait-dfs

Example:

Device(config)# ap dot11 5ghz rrm channel zero-wait-dfs

Enables the Zero Wait Dynamic Frequency Selection feature. By default, the feature is disabled.

Use the no form of this command to disable the feature.

Note

 
The Zero Wait Dynamic Frequency Selection feature is only available on a 5-GHz radio.

Configuring Zero Wait Dynamic Frequency Selection Globally (GUI)

Procedure

Step 1

Choose Configuration > Radio Configurations > RRM.

Step 2

In the RRM page, click the 5 GHz Band tab.

Step 3

Click the DCA tab.

Step 4

Select the Zero Wait DFS check box to allow the AP to change to DFS without a service outage.

Step 5

Click Apply.

Enabling Zero Wait Dynamic Frequency Selection on a RF Profile (CLI)

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 2

ap dot11 5ghz rf-profile profile-name

Example:

Device(config)# ap dot11 5ghz rf-profile test-dfs

Configures a radio frequency (RF) profile and enters RF profile configuration mode.

Step 3

channel zero-wait-dfs

Example:

Device(config-rf-profile)# channel zero-wait-dfs

Enables the Zero Wait Dynamic Frequency Selection feature for the RF profile.

Use the no form of this command to disable the feature.

Enabling Zero Wait Dynamic Frequency Selection on a RF Profile (GUI)

Procedure

Step 1

Choose Configuration > Tags & Profiles > RF/Radio.

Step 2

In the RF tab, click Add.

The Add RF Profile page is displayed.

Step 3

Enter the name for the RF profile.

Step 4

From the Radio Band drop-down, choose the 5 GHz band.

Step 5

Click the RRM tab.

Step 6

Click the DCA tab.

Step 7

Select the Zero Wait DFS check box to allow the AP to change to DFS without a service outage.

Step 8

Click Apply to Device.

Verifying Zero Wait Dynamic Frequency Selection Configuration

Use the following commands to verify the DFS configuration.

To display the Zero Wait DFS configuration on an AP, use the following command:

Device# show ap name ap1 config slot 1 | inc Zero

  Zero Wait DFS Parameters
    Zero Wait DFS Capable                       : Yes
    CAC Domain                                  : None

To display the global configuration related to the Zero Wait Dynamic Frequency Selection feature, use the following command:

Device# show ap dot11 5ghz channel | inc Zero

  Zero Wait DFS Parameters
    Zero Wait DFS Capable                       : Yes
    CAC Domain                                  : None

To display the RF profile configuration related to the Zero Wait Dynamic Frequency Selection feature, use the following command:

Device# show ap rf-profile name test detail | sec Zero

Description                       : 
RF Profile Name                   : test
Band                              : 5 GHz
Transmit Power Threshold v1       : -70 dBm
Min Transmit Power                : -10 dBm
Max Transmit Power                : 30 dBm
.
.
.
Guard Interval                    : default
Zero Wait DFS                     : Enabled