Contents

Configuring WLAN optimization· 1

About WLAN optimization· 1

Restrictions and guidelines: WLAN optimization configuration· 1

Configuring rejection of weak-signal clients· 1

Configuring AP-triggered client reassociation· 2

Configuring hidden node protection· 2

Configuring fast forwarding of AP-to-client data frames· 3

Setting the maximum retransmissions and retries for an EAPOL-Key packet 4

Configuring client fast keepalive· 4

Enabling client inspection· 5

 

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 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.     Configure rejection of weak-signal clients.

option client reject { disable | enable [ rssi rssi-value ] }

By default:

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

¡     In an AP group's radio view, rejection of 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 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.     Configure AP-triggered client reassociation.

option client reconnect { disable | enable [ rssi rssi-value ] [ interval interval ] }

By default:

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

¡     In an AP group's radio view, 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 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.     Configure hidden node protection.

option client hide-node-protection { disable | 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, hidden node protection 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 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.     Configure fast forwarding of AP-to-client data frames.

option client fast-forwarding { disable | enable level level-value }

By default:

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

¡     In an AP group's radio view, fast forwarding of AP-to-client data frames is disabled.

Setting the maximum retransmissions and retries for an EAPOL-Key packet

About this task

In Robust Security Network Association (RSNA) authentication, an AP and a client use EAPOL-Key packets in the four-way handshake to negotiate the keys. After that, the AP and the client periodically exchange EAPOL-Key packets to update the keys.

During key negotiation or update, the AP keeps retransmitting an EAPOL-Key packet until a response is received or the maximum number of retries for an EAPOL-Key packet is reached.

The system starts to count the retries when the maximum number of retransmissions is reached.

For more information about RSN key negotiation or update, see WLAN Security Configuration Guide.

Restrictions and guidelines

To ensure successful RSN key negotiation or update, you can increase the maximum number of retransmissions and the maximum number of retries for an EAPOL-Key packet.

Procedure

1.     Enter system view.

system-view

2.     Enter service template view.

wlan service-template service-template-name

3.     Set the maximum number of retransmissions for an EAPOL-Key packet and the retransmission interval.

option 4-way-handshake resend max-count [ interval interval ]

By default, the maximum number of retransmissions for an EAPOL-Key packet is three, and the retransmission interval is 300 milliseconds.

4.     Set the maximum number of retries for an EAPOL-Key packet and the retry interval.

option 4-way-handshake retry max-count [ interval interval ]

By default, the maximum number of retries for an EAPOL-Key packet is three, and the retry interval is 5 seconds.

Configuring client fast keepalive

About this task

The client keepalive feature enables an AP to send keepalive packets to clients at the specified interval to determine whether the clients are online. To quickly determine whether clients are online and save radio resources, configure this feature to set the maximum number of keepalive packets that an AP can send to a client. The AP logs off a client if it does not receive any replies from the client after sending the specified number of keepalive packets to the client.

Restrictions and guidelines

This feature is mainly used in scenarios with high client mobility. If the network quality is poor, reduce the maximum number of keepalive packets that an AP can send to a client. As a best practice, use the default setting in scenarios with stable clients.

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 AP group AP model view.

wlan ap-group group-name

ap-model ap-model

3.     Enter radio view.

radio radio-id

4.     Configure the client fast keepalive feature.

rrop client fast-keep-alive { disable | enable [ count count-value ] }

By default:

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

¡     In an AP group's radio view, the client fast keepalive feature is enabled.

¡      

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.     Enter AP view or AP group view.

¡     Enter AP view.

wlan ap ap-name

¡     Enter AP group view.

wlan ap-group group-name

3.     Enable client inspection.

wlan client inspect enable

By default, client inspection is disabled.