Configuring RRM Parameters
The Radio Resource Management (RRM) software embedded in the Cisco Wireless LAN Controller acts as a built-in RF engineer to consistently provide real-time RF management of your wireless network. RRM enables Cisco WLCs to continually monitor their associated lightweight access points for the following information:
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Traffic load: The total bandwidth used for transmitting and receiving traffic. It enables wireless LAN managers to track and plan network growth ahead of client demand.
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Interference: The amount of traffic coming from other 802.11 sources.
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Noise: The amount of non-802.11 traffic that is interfering with the currently assigned channel.
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Coverage: The received signal strength (RSSI) and signal-to-noise ratio (SNR) for all connected clients.
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Other: The number of nearby access points.
Flexible Radio Assignment (FRA) is a new core algorithm added to RRM to analyze the Neighbor Discovery Packet (NDP) measurements and manage the hardware used to determine the role the new flexible radio (2.4 GHz, 5 GHz, or Monitor) will play in your network.
On the > > page you can configure RRM parameters such as RRM neighbor discover type, RRM neighbor discovery mode, coverage, Dynamic Channel Assignment (DCA) parameters, transmit power control (TPC) parameters, and RF grouping parameters.
Click 6 GHz Band, 5 GHz Band, or 2.4 GHz Band based on the radio for which you want to configure network parameters.
The General tab allows to configure RRM information related to traps, interference, and monitoring.
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In the Profile Threshold For Traps section, configure the following:
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In the Interference Percentage field, enter the foreign interference threshold in percentage. The value must be in the range of 0 to 100. The default is 10%.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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In the Clients field, enter the client threshold value. The value must be in the range of 1 to 75. The default is 12.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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In the Noise field, enter the foreign noise threshold in dBm. The value must be in the range of –127 to 0. The default is –70 dBm.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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In the Utilization Percentage field, enter the RF utilization threshold in percentage. The value must be in the range of 0 and 100. The default is 80%.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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In the Throughput field, enter the average rate of successful messages delivery over a communication channel in bps. The value must be in the range of 1000 to 10000000. The default is 10000000.
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In the Noise/Interference/Rogue/CleanAir/SI Monitoring Channels section, configure the following:
Note: CleanAir and SI monitoring is allowed on these channels only when the AP is configured in monitor mode.
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From the Channel List drop-down list, select one of the following channels:
All Channels: RRM channel scanning occurs on all channels supported by the selected radio, which includes channels not allowed in the country of operation.
Country Channels:RRM channel scanning occurs only on the data channels allowed in the country of operation. This is set by default.
DCA Channels: RRM channel scanning occurs only on the channel set used by the dynamic channel assignment algorithm, which by default includes all of the non-overlapping channels allowed in the country of operation. However, you can use the Dynamic Channel Assignment (DCA) page to specify the channel set to be used by DCA.
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From the RRM Neighbor Discover Type drop-down list, select the type of neighbor discovery:
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Transparent: Packets are send without encryption.
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Protected: Packets are encrypted before they are send.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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Enable RRM Neighbour Discovery Mode to detect and configure new devices. The supported modes are:
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AUTO: If the NDP mode configured is AUTO, the controller selects On-Channel as the NDP mode. This is set as the default.
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OFF-CHANNEL: If the NDP mode configured is Off-Channel, the controller selects Off-Channel as the NDP mode.
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In the Monitor Intervals section, configure the following:
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Enter the frequency at which the neighbor discovery packets are sent in seconds. The value must be in the range of 60 to 3600. The default is 180 seconds.
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Enter the reporting interval in seconds. The value must be in the range of 60 to 3600. The default is 180 seconds. Each channel dwell has to be completed within 180 seconds.
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Enter the timeout to determine when to prune access points from the neighbor list in seconds. The value must be in the range of 5 to 60. The default is 20 seconds.
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Click to save the configuration.
Note: To set all Auto RF radio parameters to the factory defaults, click .
The Coverage tab allows to configure parameters that detect areas of radio coverage in a wireless LAN that are below the level needed for robust radio performance.
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Select the Enable Coverage Hole Detection check box to enable coverage hole detection.
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In the Data RSSI threshold field, enter the threshold value for data RSSI in dBm. The value must be in the range of -90 to -60. The default value is –80 dBm.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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In the Voice RSSI threshold field, enter the threshold value for voice RSSI in dBm. The value must be in the range of -90 to -60. The default value is –80 dBm.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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In the Minimum Failed Client per AP field, enter the minimum number of allowed clients on an AP with a signal-to-noise ratio (SNR) below the coverage threshold. The value must be in the range of 1 to 75. The default value is 3.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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In the Percent Coverage Exception Level per AP field, enter the maximum desired percentage of clients on an access point’s radio operating below the desired coverage threshold. The value must be in the range of 0 to 100. The default value is 25%.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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In the Voice Packet Count field, enter the number of voice data packets. The value must be in the range of 1 to 255. The default is 100.
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In the Data Packet Count field, enter the number of data packets. The value must be in the range of 1 to 255. The default is 50.
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In the Voice Packet Percentage field, enter the percentage of voice data packets. The value must be in the range of 1 to 100. The default is 50%.
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In the Data Packet Percentage field, enter the percentage of data packets. The value must be in the range of 1 to 100. The default is 50%.
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Click to save the configuration.
The DCA tab allows to specify the channels that the dynamic channel assignment (DCA) algorithm considers when selecting the channels to be used for RRM scanning.
On the DCA page, you can view the name of the channel assignment leader and the last auto channel assignment.
- In the Dynamic Channel Assignment Algorithm section, configure the following:
Choose a Channel Assignment Mode to specify the DCA mode:
Automatic: Causes the device to periodically evaluate and, if necessary, update the channel assignment for all joined APs. This is set as default.
Freeze: Causes the device to evaluate and update the channel assignment for all joined APs. Click Invoke Channel Update Once to apply the RRM data successfully.
Note: This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
Off: Turns off DCA and sets all AP radios to the first channel of the band, which is the default value. If you choose this option, you must manually assign channels on all radios.
From the Interval drop-down list, choose the interval that decides how often the DCA algorithm is allowed to run. The range is from 10 minutes to 24 hours. The default interval is 10 minutes.
From the Anchortime drop-down list, choose a number that specifies the time of day when the DCA algorithm must start. The range is from 0 and 23. 0 represents 12:00 a.m. and 23 represents 11:00 p.m.
Select the Avoid Foreign AP Interference check box to allow the device’s RRM algorithms to consider 802.11 traffic from foreign APs (those not included in your wireless network) when assigning channels to lightweight APs. For example, RRM may adjust the channel assignment to have access points avoid channels close to foreign APs. By default, the check box is enabled.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
Select the Avoid Cisco AP Load check box to allow the device’s RRM algorithms to consider 802.11 traffic from Cisco lightweight APs in your wireless network when assigning channels. For example, RRM can assign better reuse patterns to access points that carry a heavier traffic load. By default, the check box is disabled.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
Select the Avoid Non 5 GHz Noise check box to allow the device’s RRM algorithms to consider noise (non-802.11 traffic) in the channel when assigning channels to lightweight APs. For example, RRM may have APs avoid channels with significant interference from non-AP sources, such as microwave ovens. By default, the check box is enabled.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
Select the Avoid Persistent Non-WiFi Interference check box to enable the device to ignore persistent non-WiFi interference.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
From the DCA Channel Sensitivity drop-down list, choose one of the following options to specify how sensitive the DCA algorithm is to environmental changes such as signal, load, noise, and interference when determining whether to change channels:
Low: The DCA algorithm is not particularly sensitive to environmental changes. The DCA threshold is 5 dB.
Medium: The DCA algorithm is moderately sensitive to environmental changes. The DCA threshold is 15 dB. This is set as default.
High: The DCA algorithm is highly sensitive to environmental changes. The DCA threshold is 30 dB.
Set the Channel Width as required. You can choose the RF channel width as 20 MHz, 40 MHz, 80 MHz, 160 MHz, or Best.
Note:
- This setting is available for the 5 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
Set the Dynamic Bandwidth Selection Max Channel Width as required.
Note: This setting is available for the 5 GHz Band and 6 GHz Band radio only.
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In the Auto-RF Channel List section, select the corresponding check box to choose a channel.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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In the Event Driven RRM section, configure the following:
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Select the EDRRM check box to run RRM when CleanAir-enabled AP detects a significant level of interference.
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From the Sensitivity Threshold drop-down list, select the level at which the RRM is invoked. The available values are:
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Low
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Medium
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High
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Custom: Enter the custom threshold. The valid value are between 1 and 99.
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Select the Rogue Contribution check box to enable the AP to become reactive to Wi-Fi interference that is not coming from own network.
Enter the rogue duty-cycle value to invoke a channel change based on neighboring rogue interference. The valid values for rogue duty-cycle is between 1 and 99. The default value is 80.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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- Click to save the configuration.
The TPC tab allows to edit the transmit power control (TPC) parameters.
On the TPC page, you can view the name of the power assignment leader, the interval at which transmit power details are updated, and the number of power neighbors.
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Choose of the following dynamic transmit power assignment modes:
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Automatic: The transmit power is periodically updated for all APs that permit this operation. This is set as default
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On Demand: The transmit power is updated on demand. Click Invoke Power Update Once to apply the RRM data successfully.
Note: This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
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Fixed: No dynamic transmit power assignments occur and values are set to their global default.
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Enter the maximum power level assignment value on this radio in dBm. The value must be in the range of -10 to 30. The default is 30 dBm.
If you configure maximum transmit power, RRM does not allow any access point attached to the device to exceed this transmit power level (whether the power is set by RRM TPC or by coverage hole detection). For example, if you configure a maximum transmit power of 11 dBm, then no access point would transmit above 11 dBm, unless the access point is configured manually.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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Enter the minimum power level assignment on this radio. The value must be in the range of –10 to 30. The default is -10 dBm.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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Enter the cutoff signal level used by RRM when determining whether to reduce an access point’s power in dBm. The range for this parameter is –80 to –50.
The default value for this parameter varies depending on the TPC version you choose. For TPCv1, the default value is –70 dBm, and for TPCv2, the default value is –67 dBm. The default value can be changed when access points are transmitting at higher (or lower) than desired power levels.
Increasing this value (between –65 and –50 dBm) causes the access points to operate at higher transmit power rates. Decreasing the value has the opposite effect. In applications with a dense population of access points, it may be useful to decrease the threshold to –80 or –75 dBm in order to reduce the number of BSSIDs (access points) and beacons seen by the wireless clients. Some wireless clients might have difficulty processing a large number of BSSIDs or a high beacon rate and might exhibit problematic behavior with the default threshold.
Note:
- This setting is available for the 5 GHz Band and 2.4 GHz Band radio only.
- For the 6 GHz Band radio, this setting is available as part of the default profile only.
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Enable TPC Channel Aware to allow considering neighbors in the TPC calculation. This allows a more aggressive assignment by TPC while ensuring that the neighbor interference does not increase.
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Click to save the configuration.
The RF Grouping tab allows to create RF group. An RF group is a logical collection of devices that coordinate to perform RRM in a globally optimized manner and network calculations on a per-radio basis. An RF group exists for each 802.11 network type. Clustering devices into a single RF group enable the RRM algorithms to scale beyond the capabilities of a single device.
Lightweight APs periodically send out neighbor messages over the air. APs using the same RF group name validate messages from each other.
On the RF Grouping page, you can view the role of the group, the time configured to update the group, and the name of the RF group leader, and the properties of the group members.
Note: When AI Enhanced RRM is enabled on a controller and Cisco DNA Center is connected to a wireless network, Cisco DNA Center is assigned the group role as leader. Controllers, managed by Cisco DNA Center and enabled with AI Enhanced RRM, are assigned the group role as remote members irrespective of the group mode they were previously assigned. The Group Role field will display as Remote Member and the Group leader field will display the IP address of the Cisco DNA Center.
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Choose a group mode:
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Automatic: Members of an RF group elect an RF group leader to maintain a primary power and channel scheme for the group. The RF grouping algorithm dynamically chooses the RF group leader and ensures that an RF group leader is always present. Group leader assignments can and do change (for instance, if the current RF group leader becomes inoperable or if RF group members experience major changes). This is set as default.
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Leader: A device as an RF group leader, manually. In this mode, the leader and the members are manually configured and are therefore fixed. If the members are unable to join the RF group, the reason is indicated. The members’ management IP addresses and system name are used to request the member to join the leader. The leader tries to establish a connection with a member every 1 minute if the member has not joined in the previous attempt.
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Off: No RF group is configured.
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To apply the RRM data to RF grouping, click .
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Click to save the configuration.
The Spatial Reuse tab allows to set the BSS color assignment mode and view details related to BSS color assignment.
On the Spatial Reuse page, you can view the BSS color assignment leader and the last run duration.
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Choose the BSS Color Assignment Mode:
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Automatic: The BSS color assignment mode is assigned automatically.
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Off: No BSS color assignment mode is configured.
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Click to save the configuration.
The FRA tab allows to configure parameters such as FRA status, interval, sensitivity, service priority, sensor threshold and so on.
On the FRA page, you can view the FRA operation state.
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Enable FRA Status to allow FRA and determine the overlapping 2.4 GHz or 5 GHz coverage for each AP. By default, the FRA is disabled.
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Enable FRA Freeze to lock the radio’s current assigned role. When enabled, the radios continue to operate in their role (monitor, sniffer or client serving) until you manually change it or disable FRA Freeze..
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From the FRA Interval drop-down list, choose the FRA run interval. The range is from 1 hour to 24 hours. You can choose the FRA run interval value only after you enable the FRA status.
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From the FRA Sensitivity drop-down list, choose the percentage of Coverage Overlap Factor (COF) required to consider a radio as redundant. You can select the supported value only after you enable the FRA status.
The supported values are as follows:
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Low: 100 percent
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Medium: 95 percent. This is set as a default.
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High: 90 percent
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Ever Higher: 80 percent
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Super High: 50 percent
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From the FRA Action drop-down list, select the 2.4GHz Monitor option to globally configure the redundant dual band (XOR 2.4/5GHz) radios to operate in monitor role. By default, dual band radios operate in the role. This configuration is helpful especially when there is enough coverage on the 5 GHz Band and you want to restrict radios from moving to that band to prevent further interference. Instead the radios directly move to the monitor mode in the 2.4 GHz band.
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Select the Client Aware check box to take decisions on redundancy.
When enabled, the Client Aware feature monitors the dedicated 5 GHz radio and when the client load passes a pre-set threshold, automatically changes the Flexible Radio assignment from a monitor role into a 5 GHz role, effectively doubling the capacity of the cell on demand. Once the capacity crisis is over and Wi-Fi load returns to normal, the radios resume their previous roles.
Note: This setting is available for the 2.4/5 GHz Flexible Radio Assignment only.
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Enter a value for client selection. The value must be in the range of 0 to 100. The default is 50.
This means that if the dedicated 5 GHz interface reaches 50% channel utilization, this will trigger the monitor role dual-band interface to transition to a 5 GHz client-serving role.
Note: This setting is available for the 2.4/5 GHz Flexible Radio Assignment only.
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Enter a reset value for the client. The value must be in the range of 0 to 100. The default is 5.
Once the AP is operating as a dual 5 GHz AP, this setting indicates the reduction in the combined radios overall channel utilization required to reset the dual-band radio to monitor role.
Note: This setting is available for the 2.4/5 GHz Flexible Radio Assignment only.
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Click to save the configuration.
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