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Title | Size | Download |
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01-WLAN optimization configuration | 101.66 KB |
1 Configuring WLAN optimization
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 attempts
Configuring transmit power adjustment
Configuring 802.11n packet suppression
Configuring fast forwarding of AP-to-client data frames
Configuring broadcast and multicast packet control
Configuring broadcast and multicast packet rate limiting
Configuring software retransmission
Display and maintenance commands for WLAN optimization
1 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 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 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.
Hardware and feature compatibility
Hardware series |
Model |
Feature compatibility |
WA6600 series |
WA6638 WA6638i WA6636 WA6630X WA6628 WA6628X WA6628E-T WA6628XM WA6622 WA6620 WA6620X WA6620X-LI WA6620XE-LI |
No |
WA6500 series |
WA6528i |
Yes |
WA6300 series |
WA6338 WA6338-HI WA6338-LI WA6330 WA6330-LI WA6322 WA6322H WA6322H-HI WA6322H-LI WA6320 WA6320-C WA6320-D WA6320-HI WA6320-SI WA6320S-C WA6320S-E WA6320H WA6320H-HI WA6320H-LI WA6320H-XEPON |
Yes |
WAP922 series |
WAP922 WAP922E WAP922H WAP922X |
· Yes: ¡ WAP922 ¡ WAP922E ¡ WAP922H · No: ¡ WAP922X |
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 WA6628XM WA6622 WA6620 WA6620X WA6620X-LI WA6620XE-LI |
No |
WA6500 series |
WA6528i |
Yes |
WA6300 series |
WA6338 WA6338-HI WA6338-LI WA6330 WA6330-LI WA6322 WA6322H WA6322H-HI WA6322H-LI WA6320 WA6320-C WA6320-D WA6320-HI WA6320-SI WA6320S-C WA6320S-E WA6320H WA6320H-HI WA6320H-LI WA6320H-XEPON |
Yes |
WAP922 series |
WAP922 WAP922E WAP922H WAP922X |
· Yes: ¡ WAP922 ¡ WAP922E ¡ WAP922H · No: ¡ WAP922X |
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 WA6628XM WA6622 WA6620 WA6620X WA6620X-LI WA6620XE-LI |
No |
WA6500 series |
WA6528i |
Yes |
WA6300 series |
WA6338 WA6338-HI WA6338-LI WA6330 WA6330-LI WA6322 WA6322H WA6322H-HI WA6322H-LI WA6320 WA6320-C WA6320-D WA6320-HI WA6320-SI WA6320S-C WA6320S-E WA6320H WA6320H-HI WA6320H-LI WA6320H-XEPON |
Yes |
WAP922 series |
WAP922 WAP922E WAP922H WAP922X |
· Yes: ¡ WAP922 ¡ WAP922E ¡ WAP922H · No: ¡ WAP922X |
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.
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 broadcast and multicast packet control
About this task
To save radio resources and improve the forwarding performance, perform the following tasks:
· Configure APs not to forward broadcast or multicast packets through radio interfaces.
· Enable basic broadcast and multicast packet control in an IPv4 network. Then, APs reply to ARP broadcast packets, discard DHCP broadcast packets, and process other packets normally.
· Enable basic broadcast and multicast packet control in an IPv6 network. Then, APs discard RS and DHCPv6 broadcast packets, perform unicast forwarding on RA packets, reply to NS packets, and process other packets normally.
Restrictions and guidelines
This feature is applicable only when software forwarding is used.
Procedure
1. Enter system view.
system-view
2. Configure the AP to discard broadcast and multicast packets.
rrop anti-bmc default-action deny
By default, the AP forwards broadcast and multicast packets through radio interfaces.
3. Configure the AP to discard IPv6 multicast packets.
rrop anti-bmc protocol ipv6 deny
By default, the AP takes the default action specified by the rrop anti-bmc default-action command on IPv6 multicast packets.
4. Configuring basic broadcast and multicast packet control.
rrop anti-bmc network { disable | { ipv4-simple | ipv6-simple | ipv4-and-ipv6-simple } enable }
By default, basic broadcast and multicast packet control is disabled for an IPv4 network.
Configuring broadcast and multicast packet rate limiting
Procedure
1. Enter system view.
system-view
2. Configure broadcast or multicast packet rate limiting.
rrop anti-bmc { broadcast | multicast } rate-limit { disable | enable }
By default, broadcast or multicast packet rate limiting is disabled.
3. Set the maximum number of broadcast or multicast packets that the AP can send per second.
rrop anti-bmc { broadcast | multicast } rate-limit pps max-pps
By default, the maximum number of broadcast or multicast packets that the AP can send per second is not specified.
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.
Display and maintenance commands for WLAN optimization
Execute display commands in any view and reset commands in user view.
Task |
Command |
Display broadcast and multicast packet control statistics. |
display rrop anti-bmc statistics |
Clear broadcast and multicast packet control statistics. |
reset rrop anti-bmc statistics |