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| Title | Size | Download |
|---|---|---|
| 01-WLAN optimization configuration | 122.09 KB |
Restrictions and guidelines: WLAN optimization configuration
Configuring rejection of weak-signal clients
Configuring AP-triggered client reassociation
Configuring hidden node protection
Configuring roaming navigation
Enabling or disabling an AP to decrease the sleep interval of clients
Setting the maximum number of probe response retransmission attempts
Configuring 802.11n packet suppression
Setting the maximum retransmissions and retries for an EAPOL-Key packet
Enabling uplink STP BPDUs to pass through on APs
Configuring the traffic scheduling mode for APs
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. For some manufacturers, the manufacturer-defined signal strength for triggering roaming is –80 db.
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.
Hardware and feature compatibility
|
Hardware series |
Model |
Feature compatibility |
|
WA7200 series |
WA7220 WA7220-HI WA7220H WA7226-C WA7230 WA7230-LI |
No |
|
WA7300 series |
WA7320i WA7322H-HI WA7330X WA7338-HI |
Yes |
|
WA7500 series |
WA7538 WA7539 |
Yes |
|
WA7600 series |
WA7638 |
No |
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, 802.11ac, 802.11ax, and 802.11be 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 channel reuse
About this task
This feature enables an AP to ignore packets with a signal strength lower than the specified channel reuse level. This mechanism enables the AP to obtain more radio resources and improves the performance of APs working on the same channel.
Hardware and feature compatibility
|
Hardware series |
Model |
Feature compatibility |
|
WA7200 series |
WA7220 WA7220-HI WA7220H WA7226-C WA7230 WA7230-LI |
No |
|
WA7300 series |
WA7320i WA7322H-HI WA7330X WA7338-HI |
Yes |
|
WA7500 series |
WA7538 WA7539 |
Yes |
|
WA7600 series |
WA7638 |
No |
Restrictions and guidelines
Enabling this feature might add hidden nodes.
Procedure
1. Enter system view.
system-view
2. Enter WLAN radio interface view.
interface wlan-radio interface-number
3. Configure channel reuse.
option channel-reuse-optimization { disable | enable level level }
By default, channel reuse 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.
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.
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 retransmission attempts
About this task
Perform this task to reduce the number of probe response retransmissions sent by a radio to save resources and improve network performance.
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 retransmission attempts.
option probe-response-try { disable | enable number }
By default, the maximum number of probe response retransmission attempts is not limited.
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 |
|
WA7200 series |
WA7220 WA7220-HI WA7220H WA7226-C WA7230 WA7230-LI |
No |
|
WA7300 series |
WA7320i WA7322H-HI WA7330X WA7338-HI |
Yes |
|
WA7500 series |
WA7538 WA7539 |
Yes |
|
WA7600 series |
WA7638 |
No |
Restrictions and guidelines
With this feature enabled, both the maximum number of packets and the maximum packet length after aggregation take effect. The first rule matched is used.
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.
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.
· During the key update process, for users with AKM set to 802.1X and 802.1X reauthentication configured, the device might perform 802.1X reauthentication. At this time, the device will prioritize processing 802.1X reauthentication packets, causing the key update to fail and the user to go offline.
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.
During the key negotiation and key update process, the device first performs the first-round key negotiation based on the configured maximum retransmission attempts:
· If the negotiation succeeds, the device proceeds to the second round of negotiation based on the configured maximum retransmission attempts:
¡ If the negotiation succeeds, the user comes online.
¡ If the negotiation fails, the device continues the second round of key negotiation based on the configured maximum retry attempts. If the negotiation succeeds, the user comes online. If the second-round negotiation fails, the user goes offline.
· If the negotiation fails, the device continues the first round of key negotiation based on the configured maximum retry attempts:
¡ If the negotiation succeeds, the device proceeds to the second round of negotiation based on the configured maximum retransmission attempts.
¡ If the negotiation fails, the user goes offline.
For more information about 802.1X reauthentication, see User Access and Authentication Configuration Guide. For more information about key update, see WLAN Security Configuration Guide.
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 3, 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 3, and the retry interval is 5 seconds.
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.
Enabling uplink STP BPDUs to pass through on APs
About this task
In most networks, wireless devices are deployed at the edge and do not participate in STP calculations. Some devices send STP BPDUs proactively, which affects network STP calculations, so APs normally discard client STP BPDUs sent to the wired network.
In special networks, if such packets need to pass through, you can enable this feature. APs will allow client STP BPDUs to pass to the wired side.
Restrictions and guidelines
This feature does not affect STP BPDUs in mesh networks.
Procedure
1. Enter system view.
system-view
2. Enable uplink STP BPDUs to pass through on APs.
rrop ul-bpdu forward enable
Configuring the traffic scheduling mode for APs
About this task
After you specify a flow scheduling mode for APs, the AC calculates the available total bandwidth based on factors such as channel usage, maximum speed, and number of clients. The AC then allocates available bandwidth to the clients associated with the APs based on the mode.
· Balanced mode—The bandwidth is evenly distributed among the clients. As a best practice, use this mode in scenarios where fairness must be ensured, such as office environments.
· Quick-speed mode—Clients compete for bandwidth based on their own traffic. As a best practice, use this mode in scenarios with a small number of clients or where the performance of high-traffic clients must be ensured.
· Intelligent mode—The bandwidth is evenly distributed among the clients. Idle clients allocate their idle bandwidth to high-traffic clients based on an algorithm while ensuring their own bandwidth. As a best practice, use this mode in scenarios with a large number of clients and a significant number of idle clients to improve the bandwidth usage.
Restrictions and guidelines
This feature has a lower priority than radio-based client rate limit. When both features are configured, radio-based client rate limit configured by using the client-rate-limit enable command takes effect.
Procedure
1. Enter system view.
system-view
2. Enter radio interface view.
interface wlan-radio interface-number
3. Configuring the traffic scheduling mode.
rrop flow-schedule mode { balanced | quick-speed | intelligent [ channel-usage-threshold threshold-value | max max-value | min min-value ] }
By default, the traffic scheduling mode is quick-speed for APs.
