10-WLAN Advanced Features Configuration Guide

HomeSupportResource CenterH3C Access Points Cloud Mode Configuration Guides(E2442 R2442)-6W10010-WLAN Advanced Features Configuration Guide
01-WLAN optimization configuration
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Configuring WLAN optimization

About WLAN optimization

Proper channel planning and power control policies during WLAN deployment are important for good performance. However, in live WLAN networks, channel overlapping, collisions, and interference can easily occur because the none-overlapping channels are limited but the number of WLAN devices always increases.

The WLAN optimization features can help you improve the quality and stability of a WLAN.

Restrictions and guidelines: WLAN optimization configuration

Use WLAN optimization commands under the guidance of H3C Support.

There is no fixed combination of features for optimizing a specific WLAN. Select and adjust the features based on the application effect and WLAN performance.

The overall performance of a WLAN is determined by the network architecture as well as channel and power planning. Therefore, the WLAN optimization features cannot significantly increase the performance of a WLAN. In practice, if the features can improve the WLAN performance by 3%, the optimization is considered successful.

Configuring rejection of weak-signal clients

About this task

This feature enables an AP to reject clients with an RSSI lower than the specified threshold to release channel resources and enhance WLAN performance.

Restrictions and guidelines

After you enable this feature, wireless clients with an RSSI lower than the threshold might fail to access the WLAN.

After a client accesses the WLAN, an AP will not log off the client with an RSSI lower than the threshold but will reject the client after it disconnects from the network.

To avoid client access failures, set an appropriate RSSI value when enabling this feature.

Procedure

1.     Enter system view.

system-view

2.     Enter WLAN radio interface view.

interface wlan-radio interface-number

3.     Configure rejection of weak-signal clients.

option client reject enable [ rssi rssi-value ]

By default, rejecting weak-signal clients is disabled.

Configuring AP-triggered client reassociation

About this task

A client with a low signal strength can roam to another AP only when its signal strength is lower than the manufacturer-defined signal strength for triggering roaming. Therefore, the client cannot obtain good network experience and service quality.

This feature enables an AP to send unsolicited deauthentication frames to a client when the signal strength of the client is lower than the specified RSSI threshold. Then, the client can reassociate with the AP or roam to another AP.

Restrictions and guidelines

To avoid unexpected client logoff, set an appropriate RSSI value when enabling this feature.

Procedure

1.     Enter system view.

system-view

2.     Enter WLAN radio interface view.

interface wlan-radio interface-number

3.     Configure AP-triggered client reassociation.

option client reconnect enable [ rssi rssi-value ] [ interval interval ]

By default, AP-triggered client reassociation is disabled.

Configuring hidden node protection

About this task

This feature enables clients to send RTS or CTS frames before transmitting frames to avoid interference from hidden nodes.

Restrictions and guidelines

This feature takes effect only on 802.11g, 802.11n, and 802.11ac clients.

Procedure

1.     Enter system view.

system-view

2.     Enter WLAN radio interface view.

interface wlan-radio interface-number

3.     Configure hidden node protection.

option client hide-node-protection enable

By default, hidden node protection is disabled.

Configuring roaming navigation

About this task

802.11 protocols do not provide any client roaming control mechanisms and some clients cannot actively roam to APs with better signal strength.

Perform this task to decrease the transmit power for beacons or probe responses of an AP to enable clients to roam to APs with better signal strength.

If you set the transmit power for beacons or probe responses, the system uses the default transmit power to transmit other packets.

Hardware and feature compatibility

Hardware series

Model

Feature compatibility

WA6600 series

WA6638

WA6638i

WA6636

WA6630X

WA6628

WA6628X

WA6628E-T

WA6622

WA6620

WA6620X

No

WA6300 series

WA6338

WA6338-HI

WA6338-LI

WA6330

WA6330-LI

WA6322

WA6322H

WA6322H-HI

WA6322H-LI

WA6320

WA6320-C

WA6320-D

WA6320-SI

WA6320H

WA6320H-LI

WA6320H-XEPON

Yes

WAP922 series

WAP922E

Yes

WAP923 series

WAP923

Yes

Procedure

1.     Enter system view.

system-view

2.     Enter WLAN radio interface view.

interface wlan-radio interface-number

3.     Configure roaming navigation.

option roam-navigation { disable | enable rssi rssi-value { beacon-power power-value | probe-response-power power-value } }

By default, roaming navigation is disabled.

Enabling or disabling an AP to decrease the sleep interval of clients

About this task

A wireless client in sleep state listens for traffic indication map (TIM) information in beacon frames to determine whether the associated AP has buffered packets for it. This feature enables an AP to modify the TIM information in beacon frames to decrease the sleep interval of wireless clients to improve transmission efficiency.

Hardware and feature compatibility

Hardware series

Model

Feature compatibility

WA6600 series

WA6638

WA6638i

WA6636

WA6630X

WA6628

WA6628X

WA6628E-T

WA6622

WA6620

WA6620X

No

WA6300 series

WA6338

WA6338-HI

WA6338-LI

WA6330

WA6330-LI

WA6322

WA6322H

WA6322H-HI

WA6322H-LI

WA6320

WA6320-C

WA6320-D

WA6320-SI

WA6320H

WA6320H-LI

WA6320H-XEPON

Yes

WAP922 series

WAP922E

Yes

WAP923 series

WAP923

Yes

Procedure

1.     Enter system view.

system-view

2.     Enter WLAN radio interface view.

interface wlan-radio interface-number

3.     Enable or disable the AP to decrease the sleep interval of clients.

option keep-active { disable | enable }

By default, decreasing the sleep interval of clients is disabled.

Setting the maximum number of probe response attempts

About this task

Perform this task to reduce the number of probe responses sent by a radio to save resources and improve network performance.

Hardware and feature compatibility

Hardware series

Model

Feature compatibility

WA6600 series

WA6638

WA6638i

WA6636

WA6630X

WA6628

WA6628X

WA6628E-T

WA6622

WA6620

WA6620X

No

WA6300 series

WA6338

WA6338-HI

WA6338-LI

WA6330

WA6330-LI

WA6322

WA6322H

WA6322H-HI

WA6322H-LI

WA6320

WA6320-C

WA6320-D

WA6320-SI

WA6320H

WA6320H-LI

WA6320H-XEPON

Yes

WAP922 series

WAP922E

Yes

WAP923 series

WAP923

Yes

Procedure

1.     Enter system view.

system-view

2.     Enter WLAN radio interface view.

interface wlan-radio interface-number

3.     Set the maximum number of probe response attempts.

option probe-response-try { disable | enable number }

By default, the maximum number of probe response attempts is not limited.

Configuring transmit power adjustment

About this task

This feature enables an AP to use the adjusted transmit power to transmit packets.

Procedure

1.     Enter system view.

system-view

2.     Enter WLAN radio interface view.

interface wlan-radio interface-number

3.     Configure transmit power adjustment.

option capacity-adjust { disable | enable [ all ] { increase | decrease } value }

By default, transmit power adjustment is disabled.

Configuring 802.11n packet suppression

About this task

Perform this task to suppress 802.11n packets by defining the maximum number of aggregated MPDUs and the maximum A-MPDU length. The two thresholds take effect at the same time. If either threshold is reached, the AP stops aggregation and sends the A-MPDU.

This feature prevents 802.11n clients from affecting the performance of 802.11a and 802.11b/g clients.

Hardware and feature compatibility

Hardware series

Model

Feature compatibility

WA6600 series

WA6638

WA6638i

WA6636

WA6630X

WA6628

WA6628X

WA6628E-T

WA6622

WA6620

WA6620X

No

WA6300 series

WA6338

WA6338-HI

WA6338-LI

WA6330

WA6330-LI

WA6322

WA6322H

WA6322H-HI

WA6322H-LI

WA6320

WA6320-C

WA6320-D

WA6320-SI

WA6320H

WA6320H-LI

WA6320H-XEPON

Yes

WAP922 series

WAP922E

Yes

WAP923 series

WAP923

Yes

Procedure

1.     Enter system view.

system-view

2.     Enter WLAN radio interface view.

interface wlan-radio interface-number

3.     Configure 802.11n packet suppression.

option dot11n-restraint { disable | enable packet-number packet-number packet-length packet-length } [ inbound | outbound ] [ tid tid-number ]

By default, 802.11n packet suppression is disabled.

Configuring fast forwarding of AP-to-client data frames

About this task

This feature enables an AP to forward data frames to clients without extra processing (such as verification and counting) to improve processing efficiency.

Procedure

1.     Enter system view.

system-view

2.     Enter WLAN radio interface view.

interface wlan-radio interface-number

3.     Configure fast forwarding of AP-to-client data frames.

option client fast-forwarding enable level level-value

By default, fast forwarding of AP-to-client data frames is disabled.

Configuring software retransmission

About this task

Perform this task to configure software retransmission and set the maximum number of software retransmissions for the specified type of packets.

Procedure

1.     Enter system view.

system-view

2.     Enter WLAN radio interface view.

interface wlan-radio interface-number

3.     Enable software retransmission and set the maximum number of software retransmissions.

rrop software-retry { unicast [ eap ] | broadcast-multicast } enable count count

By default, the maximum number of software retransmissions varies by device model.

Enabling client inspection

About this task

The client inspection feature enables you to view information about packets exchanged and time consumed in each stage of the client association process.

In the current software version, the client inspection feature supports only client association, client association failure, and IP address lease extension events.

Procedure

1.     Enter system view.

system-view

2.     Enable client inspection.

wlan client inspect enable

By default, client inspection is disabled.