Cisco Flexible Radio Assignment

Flexible radio assignments

A flexible radio assignment is a configuration management feature that

  • adapts AP radio hardware for multiple roles

  • manages various Cisco AP models such as Cisco Aironet 2800 series, Cisco Aironet 3800 series, and Catalyst series, and

  • optimizes client experience by adapting radio roles based on client capabilities.

Feature history

Release

Feature

Feature Information

Cisco IOS XE 17.11.1

Convert Redundant 2.4-GHz Radios to Monitor Mode

From this release, you can select the redundant dual-band radios in a network to operate in monitor only mode.

Cisco IOS XE 17.9.1

Support for Cisco Catalyst 9166I Series Wi-Fi 6E Access Points

From this release onwards, the dual-band radio in Cisco Catalyst 9166I Series Wi-Fi 6E Access Points offers the ability to serve either in 5-GHz or 6-GHz band, as monitor or sniffer on the same AP.

Cisco IOS XE 16.10.1

Flexible Radio Assignment

This feature was introduced.

FRA role selection by AP model and client capability

FRA performs multiple roles depending on the AP model and capabilities. FRA dynamically adjusts radio roles to optimize client performance and network coverage.

FRA configuration modes

All FRA-capable models support these configuration options:

  • Automatic: Allows FRA to manage role selection automatically.

  • Client Serving: Manual role selection of 2.4-GHz, 5-GHz, or 6-GHz. FRA is not engaged.

  • Monitor: Manual role selection. FRA is not engaged.

  • Sniffer: Manual role selection. FRA is not engaged.

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2.4-GHz and 5-GHz XOR models

FRA establishes the required 2.4-GHz coverage, identifies redundant radios, and converts them to either 5-GHz or a monitor role.

Tri-radio and 5/6-GHz XOR models

FRA determines the 2.4-GHz coverage, and the redundant radios are converted to a monitor role.

Role selection based on client capabilities

5-GHz Tri-Radio: FRA determines the best operating role for the 5-GHz tri-radio (as either a single 8x8 or a dual 4x4), based on connected client capabilities.

5/6-GHz XOR Radios: For the 5/6-GHz XOR radio, the band that the radios should operate on is based on the availability of 6-GHz client presence in the regulatory domain.

FRA client steering and load balancing

FRA works with client steering to optimize how clients connect across available radios.

FRA also manages the resulting configurations of the radios to optimize client experience across flexible roles. Client Steering is responsible for load balancing client connections. For instance, from Cisco Aironet 2800 APs through Cisco Catalyst 9120 Series APs, all the internal antenna AP models perform dual 5-GHz roles as a Macro-Micro cell (a cell within a cell). The antennas on these models are built to support the directionality needed for the micro cell. FRA client steering helps to steer clients to the appropriate radio based on their position within the cell (closer clients are put on the micro cell).

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Macro-macro radio layouts

The FRA APs that support external antennas operate as Macro-Macro, which allows full control over power and channels. The CW9166I AP also supports a Macro-Macro model when using the internal antennas.

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FRA on Cisco Catalyst 9130

In Cisco Catalyst 9130 APs , FRA also manages the operating mode of the band-locked 8x8 5-GHz tri-radio by monitoring client capabilities of connected clients. Mode selection depends on the client types.

Wi-Fi 5 clients: For instance, if the attached clients are largely Wi-Fi 5-capable clients, then, beam forming should be multi-user MIMO (MU-MIMO), ensuring better capacity with dual 4x4 5-GHz cells.

Wi-Fi 6 clients: However, if the same cell has a higher number of Wi-Fi 6-capable clients, then 8x8 spatial streams support more MU-MIMO capacity and increase the overall performance of the cell and client experience.

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FRA on CW9166 AP

The CW9166 AP is the first AP with a dual-band XOR radio covering the 5-GHz and 6-GHz bands. Criteria for role selection is regulatory domain (that is, if the country’s regulatory rules support 6-GHz operations). If yes, 6-GHz is chosen. If not, 5-GHz operations are chosen.

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AP models and types of hardware managed by FRA

To provide comprehensive details on the AP models and types of hardware managed by Flexible Radio Assignment (FRA) technology, enabling users to identify the appropriate access points for their specific wireless network needs and configurations.
AP Model FRA Radios Functions

Cisco Aironet 2800 Series Access Points

2.4/5 XOR

2.4-GHz and 5-GHz or dual 5-GHz operations

Cisco Aironet 3800 Series Access Points

2.4/5 XOR

2.4-GHz and 5-GHz or dual 5-GHz operations

Cisco Aironet 4800 Series Access Points

2.4/5 XOR

2.4-GHz and 5-GHz or dual 5-GHz operations

Cisco Catalyst 9120 Series Access Points

2.4/5 XOR

2.4-GHz and 5-GHz or dual 5-GHz operations

Cisco Catalyst 9130AX Series Access Points

5-GHz Tri-Radio

2.4-GHz 4x4 and single 5-GHz 8x8, or 2.4-GHz 4x4 and dual 5-GHz 4x4

Cisco Catalyst Wireless 9166 Access Points

5/6-GHz XOR

2.4-GHz 4x4 and dual 5-GHz 4x4, or 5-GHz 4x4 and 6-GHz 4x4

Configure FRA radio (GUI)

This task helps in setting up the Flexible Radio Assignment (FRA) to efficiently manage radio resources for optimal performance.

Use this task to configure the FRA settings for both the 5/6 GHz and 2.4/5 GHz radios via the GUI.

Procedure

Step 1

Choose Configuration > Radio Configurations > RRM > FRA.

Step 2

In the Flexible Radio Assignment window, perform the following steps for both 5/6 GHz and 2.4/5 GHz sections:

  • Click the FRA Status toggle button to change the FRA status to Enabled. By default, the FRA status is Disabled.

  • Click the FRA Freeze toggle button to enable FRA freeze. Enable FRA Freeze to lock the current assigned role of the radio. Radios continue to operate in their role until you change their mode or disable FRA Freeze

  • From the FRA Interval drop-down list, choose the FRA run interval. The interval value range is from 1 hour to 24 hours.

Step 3

In the 2.4/5 GHz Flexible Radio Assignment section, perform the additional configuration:

  • From the FRA Sensitivity drop-down list, choose the percentage of Coverage Overlap Factor (COF) required to consider a radio as redundant.

    Option

    COF Requirement

    Low

    100 percent

    Medium (default)

    95 percent

    High

    90 percent

    Higher

    85 percent

    Even Higher

    80 percent

    Super High

    50 percent

  • Check the Client Aware check box to permit redundancy decisions.

    When enabled, the Client Aware option allows the system to adjust radio roles based on client distribution to improve overall performance.

  • In the Client Reset field, enter a reset value for the client. Valid values range from 0 to 100 percent channel utilization.

    Adjust the reset value to manage client distribution. Return the dual-band radio to monitor mode when channel utilization drops below the selected percentage.

Step 4

Click Apply to save the configuration.

The configuration settings are applied, enabling the specified FRA settings, enhancing adaptive radio resource management for optimal network performance.

What to do next

Review the configuration to ensure optimal FRA settings.

Enable FRA (CLI)

The purpose of this task is to enable Flexible Radio Assignment (FRA) features using command-line interface (CLI) configurations. This allows for dynamic adjustments of radio bands to optimize wireless performance.

Procedure

Step 1

In the global configuration mode, enable or disable FRA

Example:

Device# configure terminal
Device(config)# [no] ap fra

Enters global configuration mode and enables or disables FRA.

Step 2

Enable FRA 5 GHz or 6 GHz on AP

Example:

Device(config)# ap fra 5-6ghz

Enables FRA 5 GHz or 6 GHz on APs that support XOR (5 GHz or 6 GHz). Use the no form of this command to disable this feature.

Step 3

Enable FRA freeze

Example:

Device(config)# ap fra freeze

Enables FRA freeze. Use the no form of this command to disable this feature.

Step 4

Enable FRA 5 GHz or 6 GHz freeze

Example:

Device(config)# ap fra 5-6ghz freeze

Enables FRA 5 GHz or 6 GHz freeze. Use the no form of this command to disable this feature.

Step 5

Configure FRA interval

Example:

Device(config)# ap fra interval 3

Configures the FRA interval, in hours. The range is from 1 to 24 hours.

Note

 
The FRA interval must be more than the configured RRM interval.

Step 6

Configure FRA 5 GHz or 6 GHz interval

Example:

Device(config)# ap fra 5-6ghz interval 4

Configures the FRA 5 GHz or 6 GHz interval, in hours. The valid range is from 1 to 24 hours.

Step 7

Configure FRA sensitivity

Example:

Device(config)# ap fra sensitivity high

Configures FRA sensitivity.

  • high : Sets the FRA Coverage Overlap Sensitivity to high.

  • medium : Sets the FRA Coverage Overlap Sensitivity to medium.

  • low : Sets the FRA Coverage Overlap Sensitivity to low.

Step 8

Return to privileged EXEC mode

Example:

Device(config)# end

Returns to privileged EXEC mode. Alternatively, you can also press Ctrl-Z to exit global configuration mode.

Step 9

Reverts to XOR radios state

Example:

Device# ap fra revert all auto

Rolls back the XOR radio state.

  • all : Reverts all XOR Radios

  • auto-only : Reverts only XOR radios that are currently in automatic band selection.

  • auto : Places the XOR radios in automatic band selection.

  • static : Places the XOR radios in static 2.4-GHz, 5-GHz, and 6-GHz bands.

Upon successful completion, FRA will be enabled on the specified radios, optimizing the wireless network environment for better performance and coverage.

Configure Client FRA in RF Profile (CLI)

This task enables the configuration of Client FRA in an RF profile using a series of CLI commands. It helps to manage the RF profile settings efficiently for optimized network performance.

Procedure

Step 1

Configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 2

Configure the RF profile

Example:

Device(config)# ap dot11 6ghz rf-profile rf-profile-name

Configures the RF profile and enters RF profile configuration mode.

Step 3

Configure the client count threshold

Example:

Device(config-rf-profile)# client-aware-fra client-count-reset 1

Configures the client count threshold for the radio to switch from 6-GHz to 5-GHz band. The valid range is 1 to 10 clients.

Step 4

Configure utilization threshold for radio

Example:

Device(config-rf-profile)# client-aware-fra client-reset-util 5

Configures the utilization threshold for the radio to switch from 6-GHz to 5-GHz band. The valid range is 0 to 100 percent.

Upon completion of this task, the RF profile will be configured with client FRA settings, optimizing radio band utilization and client distribution.

Verify FRA configurations

The purpose of this task is to review the Flexible Radio Assignment (FRA) configurations and associated 802.11 parameters on your Cisco Access Points.

Procedure

Step 1

(Optional) View configuration and statistics of 802.11 APs

Example:

Device# show ap dot11 6ghz summary

Shows the configuration and statistics of 802.11 Cisco APs.

Step 2

(Optional) View the current FRA configuration

Example:

Device# show ap fra
                        
                        FRA State                                             : Disabled
                        FRA Sensitivity                                       : medium (95%)
                        FRA Interval                                          : 1 Hour(s)
                        
                        AP Name              MAC Address       Slot ID  Current-Band      COF %      Suggested Mode
                        -------------------------------------------------------------------------------------------
                        AP00A6.CA36.295A     006b.f09c.8290    0        2.4GHz            None       2.4GHz     
                        
                        COF : Coverage Overlap Factor
                        
                        test_machine#

Shows the current FRA configuration.

Step 3

(Optional) View FRA 5-GHz - 6-GHz configurations

Shows the FRA 5-GHz - 6-GHz configurations.

Step 4

(Optional) View the current 802.11 parameters

Example:

Device# show ap name config dot11 6ghz

Shows the current 802.11 parameters in a given AP.

Upon completing this task, you will have successfully verified the Flexible Radio Assignment (FRA) configurations and 802.11 parameters on your AP.

Verify FRA XOR 5-GHz and 6-GHz details

To view the FRA 5-GHz and 6-GHz configuration details, run this command:

Device# show ap fra 5-6ghz

To view the client utilization threshold and client reset count, run this command:

Device# show ap rf-profile name default-rf-profile-6ghz detail 
Description                       : default rfprofile for 6GHz radio
RF Profile Name                   : default-rf-profile-6ghz         
Band                              : 6 GHz                           
Transmit Power Threshold v1       : –70 dBm                         
Min Transmit Power                : –10 dBm                         
Max Transmit Power                : 30 dBm                          
Operational Rates                                                   
  802.11 6GHZ 6M Rate                 : Mandatory                   
  802.11 6GHZ 9M Rate                 : Supported                   
  802.11 6GHZ 12M Rate                : Mandatory                   
  802.11 6GHZ 18M Rate                : Supported                   
  802.11 6GHZ 24M Rate                : Mandatory                   
  802.11 6GHZ 36M Rate                : Supported                   
  802.11 6GHZ 48M Rate                : Supported                   
  802.11 6GHZ 54M Rate                : Supported                   
Max Clients                       : 200                             
.
.
.
PSC Channel List                  : 5,21,37,53,69,85,101,117,133,149,165,181,197,213,229
DCA Bandwidth                     : best
DCA Foreign AP Contribution       : Enabled
State                             : Up
  Client utilization threshold  : 5%
  Client Reset count            : 1
Client Network Preference         : default
802.11ax
  OBSS PD                         : Disabled
  Non-SRG OBSS PD Maximum         : –62 dBm
  SRG OBSS PD                     : Disabled
  SRG OBSS PD Minimum             : –82 dBm
  SRG OBSS PD Maximum             : –62 dBm
  Broadcast Probe Response        : Disabled
  FILS Discovery                  : Disabled
  Multi-BSSID Profile Name        : default-multi-bssid-profile
NDP mode                          : Auto
Guard Interval                    : none
PSC Enforcement                   : Disabled

Note

The client utilization threshold is the utilization threshold for radios to switch from 6-GHz to 5-GHz band. The client reset count is the client count threshold for radios to switch from 6-GHz to 5-GHz band.

Flexible Radio Assignment (FRA) Action

Feature History for Flexible Radio Assignment Action

This table provides release and related information about the feature explained in this section.

This feature is also available in all the releases subsequent to the one in which they are introduced in, unless noted otherwise.

Table 1. Feature History for FRA Action

Release

Feature

Feature Information

Cisco IOS XE Dublin 17.10.1

Flexible Radio Assignment (FRA) Action

In Cisco IOS-XE 17.10.1 and earlier releases, the FRA moves the redundant dual-band radios to either 5-GHz client-serving role or monitor role.

Cisco IOS XE Dublin17.11.1

Flexible Radio Assignment (FRA) Action

From Cisco IOS-XE 17.11.1 onwards, you can select the redundant dual-band radios in a network to operate in monitor only mode.

Information About flexible radio assignment actions

Flexible Radio Assignment (FRA) evaluates 2.4-GHz radio coverage to identify overlapping coverage causing radio interference. If there is an overlapping coverage, the dual-band radio moves to either 5-GHz client serving or monitor role.

Release Information

In Cisco IOS-XE 17.10.1 and earlier releases, the FRA moves the redundant dual-band radios to either 5-GHz client-serving role or monitor role. From Cisco IOS-XE 17.11.1 onwards, you can set redundant dual-band radios in a network to operate in monitor-only mode.


Note

The FRA action feature is disabled by default.

Configure FRA action in default RF profile (CLI)

Configure the FRA action in the default RF profile to optimize radio frequency management.

Procedure

Step 1

Configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 2

Configure the FRA action

Example:

Device(config)# ap dot11 24ghz fra action monitor

Configures the FRA action to monitor mode, moving all redundant dual-band APs solely to the monitor role.

Step 3

Exit configuration mode

Example:

Device(config)# end

Exits configuration mode and returns to privileged EXEC mode.

Upon completion, the FRA action is set, redundancy in dual-band radios is handled efficiently, and the system returns to privileged EXEC mode.

Configure FRA action in 2.4-GHz RF profile (CLI)

Procedure

Step 1

Configure terminal

Example:

Device# configure terminal

Enters global configuration mode

Step 2

Configure the RF profile name

Example:

Device(config)# ap dot11 24ghz rf-profile alpha-rfprofile-24ghz

Configures the RF profile name and enters RF profile configuration mode.

Step 3

Configure the FRA action as monitor

Example:

Device(config-rf-profile)# fra action monitor

Configures the FRA action as monitor, and moves all redundant dual-band radios to monitor role only.

Step 4

Exit configuration mode

Example:

Device(config-rf-profile)# end

Exits configuration mode and returns to privileged EXEC mode.

Verify FRA action configuration

To view the selected FRA action, use the following command:

Device# show ap fra
FRA State              : Enabled
FRA Freeze             : Disabled
FRA Operation State    : Up
FRA Sensitivity        : higher (85%)
FRA Interval           : 1 Hour(s)
Service Priority       : Coverage
Client Aware FRA       : Enabled
  Client Select        : 25%
  Client Reset         : 5%
FRA Action             : 2.4GHz/Monitor
  Last Run             : 3069 seconds ago

To view the FRA action details in an AP RF profile, use the following command:

Device# show ap rf-profile name madhu-rf-profile-24 detail | sec FRA
Client Aware FRA                  : Disabled
FRA Action                        : 2.4GHz/Monitor

To view the radio mode and role in an AP, use the following command:

Device# show ap name AP7872.5DED.CB74 config slot 0 | sec Attribute
Attributes for Slot 0
  Radio Type                                    : 802.11n - 2.4/5 GHz
  Radio Mode                                    : Monitor
  Radio Role                                    : Monitor
    Assignment Method                           : Auto
    Monitor Mode Reason                         : Automatically Switched by FRA