08-Radio Resources Management

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07-Spectrum management configuration
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07-Spectrum management configuration 78.25 KB

Configuring spectrum management

About spectrum management

Spectrum management is 802.11h compliant. It is used on 5 GHz WLANs to ensure that clients meet the regulatory requirements for operation in the 5 GHz band. It enables an AP to notify its associated clients of the allowed maximum transmit power. The AP can deny the association request from a client if the power and channel of the client do not meet the regulatory requirements.

Spectrum management tasks at a glance

To configure spectrum management, perform the following tasks:

1.     Enabling spectrum management

2.     (Optional.) Setting the power constraint mode

3.     (Optional.) Setting the channel switch mode

4.     (Optional.) Setting the transmit power capability match mode

5.     (Optional.) Setting the channel capability match mode

Enabling spectrum management

Restrictions and guidelines

This feature is available only for 5 GHz radios.

Procedure

1.     Enter system view.

system-view

2.     Enter radio interface view.

interface wlan-radio interface-number

3.     Enable spectrum management.

spectrum-management enable

By default, spectrum management is disabled.

Setting the power constraint mode

About this task

This feature enables a radio to restrict the transmit power of its associated clients to avoid interference with other wireless devices. Upon receiving a beacon frame or probe response that contains the power constraint value from the radio, a client uses its new local maximum transmit power to transmit traffic. The new local maximum transmit power is the maximum transmit power level specified for the channel minus the power constraint value.

You can set the following power constraint modes for a radio:

·     Manual—You specify a power constraint value.

·     Auto—The radio automatically calculates the power constraint value.

Restrictions and guidelines

This feature is available only for 5 GHz radios.

Power constraint takes effect only when you enable spectrum management or radio resource measurement. For more information about radio resource measurement, see "Configuring WLAN radio resource measurement."

Procedure

1.     Enter system view.

system-view

2.     Enter radio interface view.

interface wlan-radio interface-number

3.     Set the power constraint mode.

power-constraint mode { auto [ anpi-interval anpi-interval-value ] | manual power-constraint }

By default, the power constraint mode is auto.

Setting the channel switch mode

About this task

This feature enables a radio to send a channel switch announcement to the associated clients when the radio is changing to a new channel. The announcement contains the new channel number and information about whether the clients can continue sending frames.

Procedure

1.     Enter system view.

system-view

2.     Enter radio interface view.

interface wlan-radio interface-number

3.     Set the channel switch mode.

channel-switch mode { continuous | suspend }

By default, the channel switch mode is suspend. Online clients stop sending frames during channel switch.

Setting the transmit power capability match mode

About this task

This feature allows clients to associate with a radio based on the predefined match criteria. Transmit power capability refers to the minimum and maximum powers with which a client and a radio can transmit frames in the current channel. The device supports the following client power capability match modes:

·     All—A client is allowed to associate with a radio only when each of its transmit power capabilities matches each of the radio's transmit power capabilities.

·     None—Client transmit power capabilities are not checked.

·     Partial—A client is allowed to associate with a radio as long as one of its transmit power capabilities matches any transmit power capabilities of the radio.

Restrictions and guidelines

The transmit power capability match mode takes effect only when you enable spectrum management or radio resource measurement. For more information about radio resource management, see "Configuring WLAN radio resource measurement."

Procedure

1.     Enter system view.

system-view

2.     Enter radio interface view.

interface wlan-radio interface-number

3.     Set the transmit power capability match mode.

power-capability mode { all | none | partial }

By default, client transmit power capabilities are not checked.

Setting the channel capability match mode

About this task

This feature allows clients to associate with a radio based on the predefined match criteria. Channel capability refers to the channels a client and a radio each support. The device provides the following client channel capability match modes:

·     All—A client is allowed to associate with a radio only when each of its supported channels matches each of the radio's supported channels.

·     None—Client channel capabilities are not checked.

·     Partial—A client is allowed to associate with a radio as long as one of its supported channels matches any supported channels of the radio.

Restrictions and guidelines

This feature is available only for 5 GHz radios.

Procedure

1.     Enter system view.

system-view

2.     Enter radio interface view.

interface wlan-radio interface-number

3.     Set the client channel capability match mode.

channel-capability mode { all | none | partial }

By default, client channel capabilities are not checked.

Spectrum management configuration examples

Example: Configuring spectrum management

Network configuration

As shown in Figure 1, configure spectrum management to restrict the transmit power of the client and allow the client to continue sending frames during channel switch.

Figure 1 Network diagram

Procedure

# Enable spectrum management.

<AP> system-view

[AP] interface wlan-radio 1/0/1

[AP-WLAN-Radio1/0/1] spectrum-management enable

# Set the channel capability match mode to all.

[AP-WLAN-Radio1/0/1] channel-capability mode all

# Set the transmit power capability match mode to all.

[AP-WLAN-Radio1/0/1] power-capability mode all

# Set the power constraint mode to manual and set the power constraint value to 5 dBm.

[AP-WLAN-Radio1/0/1] power-constraint mode manual 5

# Set the channel switch mode to continuous.

[AP-WLAN-Radio1/0/1] channel-switch mode continuous

Verifying the configuration

# Execute the display wlan client command to verify that the client can successfully associate with the radio. (Details not shown.)