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Configuring ARM Features on an IAP

You can configure ARM features such as band steering, spectrum load balancing, and airtime fairness mode either using Instant UI or CLI.

In the Instant UI

To configure ARM:

1. Click the RF link at the top right corner of the Instant main window.
2. Click Show advanced options. The ARM tab details are displayed.

Figure 1  RF Window - ARM Tab

3. Configure the following parameters for Band steering mode:

Table 1: Band Steering Mode - Configuration Parameters

Parameter

Description

Prefer 5 GHz

Select this option to use band steering in 5 GHz mode. On selecting this, the IAP steers the client to 5 GHz band (if the client is 5 GHz capable), but allows the client connection on the 2.4 GHz band if the client persistently attempts for 2.4 GHz association.

Force 5 GHz

Select this option to enforce 5 GHz band steering mode on the IAPs.

Balance Bands

Select this option is selected, the IAP tries to balance the clients across the two radios to best utilize the available 2.4 GHz bandwidth. This feature takes into account the fact that the 5 GHz band has more channels than the 2.4 GHz band, and that the 5 GHz channels operate in 40MHz while the 2.5 GHz band operates in 20MHz.

Disabled

Select this option if you want to allow the clients to select the band to use.

4. For Airtime fairness mode, specify any of the following values:

Table 2: Airtime Fairness Mode - Configuration Parameters

Parameter

Description

Default Access

Select this option to provide access based on client requests. When Air Time Fairness is set to default access, per user and per SSID bandwidth limits are not enforced.

Fair Access

Select this option to allocate Airtime evenly across all the clients.

Preferred Access Select this option to set a preference where 11n clients are assigned more airtime than 11a/11g. The 11a/11g clients get more airtime than 11b. The ratio is 16:4:1.
5. For Spectrum load balancing, specify the following parameters:

Table 3: Spectrum Load Balancing - Configuration Parameters

Parameter

Description

Client match

Select Enabled to enable the Client match feature on APs. When enabled, client count will be balanced among all the channels in the same band. For more information, see Client Match.

When client match is enabled, ensure that Scanning is enabled.

CM calculating interval

Specify a value for the calculating interval of Client match. The value specified for CM calculating interval determines the interval at which client match is calculated. The interval is specified in seconds and the default value is 30 seconds. You can specify a value within the range of 10-600.

CM neighbor matching %

Specify a value for CM neighbor matching %. This number takes into account the least similarity percentage to be considered as in the same virtual RF neighborhood of client match. You can specify a percentage value within the range of 20-100. The default value is 75%.

 

 

CM threshold Specify a value for CM threshold. This number takes acceptance client count difference among all the channels of Client match into account. When the client load on an AP reaches or exceeds the threshold in comparison, client match is enabled on that AP.

You can specify a value within range of 1-20. The default value is 2.

SLB mode

Select a mode from the SLB mode drop-down. The SLB mode determines the balancing strategy for client match. The following options are available:

l Channel
l Radio
l Channel + Radio
6. For Access Point Control, specify the following parameters:

Table 4: Access Point Control - Configuration Parameters

Parameter Description
Customize Valid Channels

Select this check box to customize valid channels for 2,4 GHz and 5 GHz. By default, the AP uses valid channels as defined by the Country Code (regulatory domain). On selecting the Customize Valid Channels check box, a list of valid channels for both 2.4.GHz and 5 GHz are displayed. The valid channel customization feature is disabled by default.

Minimum Transmit Power

Specify the minimum transmission power. The value specified for Minimum Transmit Power indicates the minimum Effective Isotropic Radiated Power (EIRP) from 3 to 33 dBm in 3 dBm increments. If the minimum transmission EIRP setting configured on an AP is not supported by the AP model, this value is reduced to the highest supported power setting. The default value is for minimum transmit power is 18 dBm.

Maximum Transmit Power

Specify the maximum transmission power. The value specified for Maximum Transmit Power indicates the maximum Effective Isotropic Radiated Power (EIRP) from 3 to 33 dBm in 3 dBm increments. If the maximum transmission EIRP configured on an AP is not supported by the AP model, the value is reduced to the highest supported power setting. The default value for maximum transmit power is 127 dBm.

Client aware

Select Enabled to allow ARM to control channel assignments for the APs with active clients. When the Client aware mode is set to Disabled, the IAP may change to a more optimal channel, which change may disrupt current client traffic. The Client aware option is Enabled by default.

Scanning

Select Enabled so that the IAP dynamically scans all 802.11 channels within its 802.11 regulatory domain at regular intervals and reports to the IAP. This scanning report includes WLAN coverage, interference, and intrusion detection data.

NOTE: For client match configuration, ensure that scanning is enabled.

Wide Channel Bands

Select a band to allow the APs to be placed in 40Mhz (wide band) channels. The Wide channel band allows administrators to configure 40 MHz channels in the 2.4 GHz and 5.0 GHz bands. 40 MHz channels are two 20 MHz adjacent channels that are bonded together. 40 MHz channel effectively doubles the frequency bandwidth available for data transmission.

For high performance, you can select 5GHz. If the AP density is low, enable in the 2.4GHz band.

80 MHz Support

Enables or disables the use of 80 MHz channels on APs. This feature allows ARM to assign 80 MHz channels on APs with 5GHz radios, which support a very high throughput. This setting is enabled by default.

NOTE: Only the APs that support 802.11ac can be configured with 80 MHz channels.

7. Reboot the IAP.
8. Click OK.

In the CLI

To configure ARM features on an IAP with 5 GHz radio:

(Instant Access Point)(config)# arm

(Instant Access Point)(ARM)# a-channels <5GHz-channels>

(Instant Access Point)(ARM)# min-tx-power <power>

(Instant Access Point)(ARM)# max-tx-power <power>

(Instant Access Point)(ARM)# band-steering-mode {<Prefer 5 GHz>| <Force 5 GHz>|<Balance Bands>|<Disabled>}

(Instant Access Point)(ARM)# air-time-fairness-mode {<Default Access>| <Fair Access> | <Preferred Access>}

(Instant Access Point)(ARM)# client-aware

(Instant Access Point)(ARM)# wide-bands {<5GHz>|<2GHz>|<All>|<None>}

(Instant Access Point)(ARM)# scanning

(Instant Access Point)(ARM)# client-match calc-interval <seconds>

(Instant Access Point)(ARM)# client-match calc-threshold <threshold>

(Instant Access Point)(ARM)# client-match nb-matching <percentage>

(Instant Access Point)(ARM)# client-match slb-mode 1

(Instant Access Point)(ARM)# 80mhz-support

(Instant Access Point)(ARM)# end

(Instant Access Point)# commit apply

 

To view ARM configuration:

(Instant Access Point)# show arm config

 

Minimum Transmit Power :18

Maximum Transmit Power :127

Band Steering Mode :prefer-5ghz

Client Aware :enable

Scanning :enable

Wide Channel Bands :5ghz

80Mhz Support :enable

Air Time Fairness Mode :fair-access

Client Match :disable

CM NB Matching Percent :75

CM Calculating Interval :30

CM SLB Threshold :2

CM SLB Balancing Mode :channel based

CM max client match req :5

CM max adoption :5

Custom Channels :No

2.4 GHz Channels

----------------

Channel Status

------- ------

1 enable

2 disable

3 disable

4 disable

5 disable

6 enable

7 disable

8 disable

9 disable

10 disable

11 enable

12 disable

13 disable

1+ enable

2+ disable

3+ disable

4+ disable

5+ disable

6+ disable

7+ enable

5.0 GHz Channels

----------------

Channel Status

------- ------

36 enable

40 enable

44 enable

48 enable

52 enable

56 enable

60 enable

64 enable

149 enable

153 enable

157 enable

161 enable

165 enable

36+ enable

44+ enable

52+ disable

60+ disable

149+ enable

157+ enable

36E enable

52E enable

149E enable