Contents

Configuring WSA·· 1

About WSA· 1

Restrictions and guidelines: WSA configuration· 1

WSA tasks at a glance· 1

Enabling WSA· 2

Configuring interference detection· 2

Importing a feature database file· 3

Specifying a channel quality sensitivity level 3

Configuring SNMP notifications for WSA· 4

Collecting FFT data· 5

Enabling FFT data collection· 5

Setting the bandwidth range for FFT data collection· 5

Display and maintenance commands for WSA· 5

WSA configuration examples· 5

Example: Configuring basic WSA· 5

 

Configuring WSA

About WSA

Wireless devices in a WLAN share frequency bands with devices such as microwave ovens and cordless phones, and these devices might interfere with the operation of the wireless devices.

Wireless Spectrum Analysis (WSA) can resolve the problem by monitoring the spectrum environment and detecting interference.

WSA provides the following features:

·     Interference identification—Identifies the types of interference devices and provides detailed information about interference devices.

·     Channel quality evaluation—Provides channel quality reports, records the number of interference devices on each channel, and calculates the average channel quality and the worst channel quality.

·     FFT data collection—Collects Fast Fourier Transform (FFT) data (including frequency, FFT power, maximum power, and FFT duty cycle) for all frequency points on each channel and sends the data to the NMS.

·     Feature database management—Deploys different feature databases to enable APs to identify different interference devices.

·     Channel adjustment—Collaborates with Radio Resource Management (RRM) to adjust channels for APs based on channel quality.

You can view the interference device information on the AC and view the real-time WSA graphs on the NMS.

Restrictions and guidelines: WSA configuration

You can configure APs by using the following methods:

·     Configure APs one by one in AP view.

·     Assign APs to an AP group and configure the AP group in AP group view.

·     Configure all APs in global configuration view.

For an AP, the settings made in these views for the same parameter take effect in descending order of AP view, AP group view, and global configuration view.

WSA tasks at a glance

To configure WSA, perform the following tasks:

1.     Enabling WSA

2.     (Optional.) Configuring interference detection

3.     (Optional.) Importing a feature database file

4.     (Optional.) Specifying a channel quality sensitivity level

5.     (Optional.) Configuring SNMP notifications for WSA

6.     (Optional.) Collecting FFT data

Enabling WSA

About this task

With WSA enabled, APs collect interference device and channel quality information and periodically send the information to the AC for further analysis.

Procedure

1.     Enter system view.

system-view

2.     Enter AP view or an AP group's AP model view.

¡     Enter AP view.

wlan ap ap-name

¡     Execute the following commands in sequence to enter an AP group's AP model view:

wlan ap-group group-name

ap-model ap-model

3.     Enter radio view.

radio radio-id

4.     Enable WSA.

spectrum-analysis enable

By default:

¡     In radio view, a radio uses the configuration in an AP group's radio view.

¡     In an AP group's radio view, WSA is disabled.

Configuring interference detection

About this task

Perform this task to configure APs to detect or to not detect the specified type of interference devices.

Procedure

1.     Enter system view.

system-view

2.     Enter AP view or an AP group's AP model view.

¡     Enter AP view.

wlan ap ap-name

¡     Execute the following commands in sequence to enter an AP group's AP model view:

wlan ap-group group-name

ap-model ap-model

3.     Enter radio view.

radio radio-id

4.     Specify an interference device type and configure detecting for the specified type of devices.

spectrum-analysis device { all | device-type } { disable | enable }

By default:

¡     In radio view, a radio uses the configuration in AP group radio view.

¡     In AP group radio view, WSA detects all types of interference devices.

The specified device type must exist in the feature database.

Importing a feature database file

About this task

A feature database stores features such as frequency hopping interval and pulse interval about specific types of interference devices. APs can detect only the types of interference devices in the feature database.

Procedure

1.     Enter system view.

system-view

2.     Import a feature database file.

wlan spectrum-analysis feature-db file file-name

By default, WSA uses the default feature database.

If you execute this command multiple times, the most recent configuration takes effect.

Specifying a channel quality sensitivity level

About this task

WSA notifies RRM to perform DFS when the following conditions are met:

·     WSA collaboration is enabled by using the calibrate-channel track spectrum-analysis enable command.

For more information about the command, see Radio Resource Management Command Reference.

·     The channel quality is lower than the channel quality value corresponding to the specified sensitivity level.

Procedure

1.     Enter system view.

system-view

2.     Enter AP view or an AP group's AP model view.

¡     Enter AP view.

wlan ap ap-name

¡     Execute the following commands in sequence to enter an AP group's AP model view:

wlan ap-group group-name

ap-model ap-model

3.     Enter radio view.

radio radio-id

4.     Specify a channel quality sensitivity level.

spectrum-analysis calibrate-channel sensitivity { high | low | medium }

By default:

¡     In radio view, a radio uses the configuration in AP group radio view.

¡     In AP group radio view, the channel quality sensitivity level is medium.

Configuring SNMP notifications for WSA

About this task

To report critical WSA events to an NMS, enable SNMP notifications for WSA. For WSA notifications to be sent correctly, you must also configure SNMP on the device. For more information about SNMP configuration, see the network management and monitoring configuration guide for the device.

WSA supports the following notifications:

·     Interference device notifications—The AC sends notifications to the NMS no matter when interference devices are detected or when they disappear.

·     Channel quality notifications—The AC sends notifications to the NMS no matter when the channel quality falls below or rises above the specified threshold.

Procedure

1.     Enter system view.

system-view

2.     Enable SNMP notifications for WSA.

snmp-agent trap enable wsa

By default, SNMP notifications for WSA are disabled.

3.     Enter AP view or an AP group's AP model view.

¡     Enter AP view.

wlan ap ap-name

¡     Execute the following commands in sequence to enter an AP group's AP model view:

wlan ap-group group-name

ap-model ap-model

4.     Enter radio view.

radio radio-id

5.     Enable interference device notifications.

spectrum-analysis trap device enable

By default:

¡     In radio view, a radio uses the configuration in an AP group's radio view.

¡     In an AP group's radio view, interference device notifications are enabled.

6.     Specify an interference device type and configure notifications for the specified type of devices.

spectrum-analysis trap device { all | device-type } { disable | enable }

By default:

¡     In radio view, a radio uses the configuration in AP group radio view.

¡     In AP group radio view, notifications are enabled for all types of interference devices.

7.     Enable channel quality notifications.

spectrum-analysis trap channel-quality enable

By default:

¡     In radio view, a radio uses the configuration in AP group radio view.

¡     In AP group radio view, channel quality notifications are enabled.

8.     Set the channel quality threshold that triggers notifications.

spectrum-analysis trap channel-quality threshold threshold-value

By default:

¡     In radio view, a radio uses the configuration in AP group radio view.

¡     In AP group radio view, the channel quality threshold is 35.

Collecting FFT data

Enabling FFT data collection

APs can collect FFT data only when both WSA and FFT data collection are enabled.

FFT data collection can be enabled only through MIB. To enable FFT data collection, open the MIB file, and set the value of the hh3cDot11CfgSaCltRtFFTData node in the hh3cDot11RadioToConfigTable table to TRUE.

Setting the bandwidth range for FFT data collection

You can set the bandwidth range for FFT data collection to high-frequency band, medium-frequency band, and low-frequency band.

To set the bandwidth range, open the MIB file, and set the value of the hh3cDot11CfgSaBand node in the hh3cDot11RadioToConfigTable table.

Display and maintenance commands for WSA

Execute display commands in any view.

 

Tasks	Command
Display channel quality information.	display wlan spectrum-analysis channel-quality [ ap ap-name | ap-group ap-group-name ]
Display interference device information.	display wlan spectrum-analysis device [ ap ap-name | ap-group ap-group-name ]

 

WSA configuration examples

The AP models and serial numbers in this document are used only as examples. Support for AP models and serial numbers depends on the AC model.

Example: Configuring basic WSA

Network configuration

As shown in Figure 1, enable WSA for the AP to detect interference devices in the WLAN.

Figure 1 Network diagram

 

Procedure

# Create an AP named ap1, and specify its serial ID.

[sysname] wlan ap ap1 model WA4320i-ACN

[sysname-wlan-ap-ap1] serial-id 219801A0CNC138011454

# Set the radio mode to dot11an for radio 1 of AP ap1, and enable radio 1.

[sysname-wlan-ap-ap1] radio 1

[sysname-wlan-ap-ap1-radio-1] type dot11an

[sysname-wlan-ap-ap1-radio-1] radio enable

# Enable WSA for radio 1 of AP ap1.

[sysname-wlan-ap-ap1-radio-1] spectrum-analysis enable

[sysname-wlan-ap-ap1-radio-1] quit

[sysname-wlan-ap-ap1] quit

[sysname] quit

Verifying the configuration

# Display information about interference devices detected by AP ap1.

<Sysname> display wlan spectrum-analysis device ap ap1

Interference detected by ap1 Radio1

 

Device ID              : 0x0001

Type                   : Frequency-hopping cordless networks

SI                       : 50

RSSI                   : -35

Duty cycle (%)         : 20

Affected channels      : 3,4,5,6,7

Detected time          : Mar 6 10:42:56 2015