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| Title | Size | Download |
|---|---|---|
| 01-WLAN optimization configuration | 124.41 KB |
Restrictions and guidelines: WLAN optimization configuration
Configuring rejection of weak-signal clients
Configuring AP-triggered client reassociation
Configuring hidden node protection
Configuring multicast and broadcast buffering
Enabling or disabling an AP to ignore weak signals
Configuring roaming navigation
Enabling or disabling an AP to decrease the sleep interval of clients
Configuring immediate packet sending
Setting the maximum interference threshold
Configuring link performance optimization
Configuring transmit power adjustment
Configuring per-packet transmit power control
Configuring 802.11n packet suppression
Setting the maximum retransmissions and retries for an EAPOL-Key packet
Setting a rate limit for packets destined to radios on other APs
Configuring software retransmission
Enabling data transmission holding during roaming
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 multicast and broadcast buffering
About this task
With this feature enabled, the AC stops sending broadcast and multicast packets and buffers them if an associated client is in sleep state. This mechanism affects the performance of real-time multicast applications.
With this feature disabled, the AC directly sends all broadcast and multicast packets regardless of whether an associated client is in sleep state.
Restrictions and guidelines
As a best practice, set the power management parameter to the maximum value on wireless clients before you disable this feature.
Disabling this feature disables clients in sleep state from receiving some broadcast and multicast packets.
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 multicast and broadcast buffering.
option broadcast-multicast-buffer { disable | enable [ limit limit ] }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, multicast and broadcast buffering is enabled.
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.
Restrictions and guidelines
Enabling this feature might add hidden nodes.
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 channel reuse.
option channel-reuse-optimization { disable | enable level level }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, channel reuse is disabled.
Enabling or disabling an AP to ignore weak signals
About this task
An AP determines that the channel is still occupied even though the signals it detects are weak, and does not forward frames any more. Ignoring packets with a signal strength lower than the specified RSSI threshold can increase frame sending and receiving efficiency.
Restrictions and guidelines
Ignoring weak signals might cause collisions and interference among devices on the same channel.
To avoid packet receiving 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. Enable or disable an AP to ignore weak signals.
option signal-ignore { 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, a radio does not ignore weak signals.
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 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 roaming navigation.
option roam-navigation { disable | enable rssi rssi-value { beacon-power power-value | probe-response-power power-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, 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 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 or disable an AP to decrease the sleep interval of clients.
option keep-active { 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, a radio does not decrease the sleep interval of clients.
Configuring immediate packet sending
About this task
When you enable this feature, APs do not detect channel collision before sending packets to save system resources and improve network throughput. Enabling this feature might cause hidden node problems. When you disable this feature, wireless devices send RTS/CTS packets to avoid channel collision.
Restrictions and guidelines
Disabling this feature might cause hidden node issues.
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 immediate packet sending.
option immediate-transmit { 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, immediate packet sending is disabled.
Configuring channel sharing
About this task
When this feature is enabled, an AP sends or does not send packets according to whether the detected signals are stronger or weaker than the specified power level. This mechanism avoids channel collision and interference.
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 channel sharing.
option channel-share { disable | enable power-level power-level }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, channel sharing is enabled.
Setting the maximum interference threshold
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. Set the maximum interference threshold.
option max-interfer-threshold { disable | enable 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, the maximum interference threshold is not configured.
Configuring link performance optimization
About this task
Perform this task to modify the packet fragmentation threshold to optimize link performance.
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 link performance optimization.
option optimize-link-performance { inbound | outbound } { disable | enable } [ 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, link performance optimization is disabled.
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 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 transmit power adjustment.
option capacity-adjust { disable | enable [ all ] { increase | decrease } 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, transmit power adjustment is disabled.
Configuring per-packet transmit power control
About this task
This feature enables an AP to dynamically perform transmit power control on a per packet basis. For example, the AP reduces the transmit power when it sends packets to a client with high RSSI. This feature can reduce power consumption, radiation, and interference and improve user experience.
Restrictions and guidelines
This feature is not applicable to 5 GHz radios of 802.11ac APs.
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 per-packet transmit power control.
option tpc { disable | enable [ minpower minpower | powerstep powerstep | rssistep rssistep | rssithreshold rssithreshold ] }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, per-packet transmit power control 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.
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 802.11n packet suppression.
option dot11n-restraint { disable | enable packet-number packet-number packet-length packet-length } [ inbound | outbound ] [ tid tid-number ]
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, 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.
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.
Setting a rate limit for packets destined to radios on other APs
About this task
After you enable the scanning service (such as wireless probing, WLAN location, and WIPS) for an AP, a radio on the AP might receive packets destined to radios on a different AP than the radio. Such packets will increase the CPU usage and decrease the processing efficiency for packets destined to radios on the AP.
To address this issue, perform this task to set a rate limit for packets destined to radios on other APs.
Procedure
1. Enter system view.
system-view
2. Enter AP view.
wlan ap ap-name
3. Enter radio view.
radio radio-id
4. Set a rate limit for packets destined to radios on a different AP than the radio.
option non-local-receive rate-limit cir cir
By default, no rate limit is set for packets destined to radios on other APs.
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 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 software retransmission and set the maximum number of software retransmissions.
rrop software-retry { unicast [ eap ] | broadcast-multicast } enable count count
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, 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. 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.
Enabling data transmission holding during roaming
About this task
With data transmission holding during roaming enabled, the device caches the packets during client roaming and sends the packets to the client after the client roams successfully to reduce the packet loss during client roaming. With data transmission holding during roaming disabled, the device ages out the cached packets after a period of time and will not send the packets to the client. As a best practice, enable this feature in the packet loss-sensitive scenario.
With advanced data transmission holding during roaming enabled, the device caches the data packets and sends the cached packets to the client to reduce the packet loss when the client signal strength is lower than the RSSI threshold specified by client anti-sticky. With advanced data transmission holding during roaming disabled, the device ages out the cached packets after a period of time and will not send the packets to the client. As a best practice, enable advanced data transmission holding during roaming in the BSS roaming scenario enabled with client anti-sticky.
Restrictions and guidelines
To make this feature take effect, enable client association at the AC and enable the AC to forward client data traffic.
This feature is not supported in an AC hierarchy network or inter-AC roaming network.
Procedure
1. Enter system view.
system-view
2. Enter service template view.
wlan service-template service-template-name
3. Enable data transmission holding during roaming.
sacp roam-optimize traffic-hold enable [ advanced ]
By default, data transmission holding during roaming is disabled.
