12-WLAN Advanced Features Configuration Guide

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01-WLAN optimization configuration
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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 multicast and broadcast buffering· 3

Configuring the EMR algorithm·· 4

Configuring dynamic directional antenna selection· 4

Configuring channel reuse· 5

Enabling or disabling an AP to ignore weak signals· 5

Configuring smart chip protection· 6

Configuring roaming navigation· 7

Configuring the quiet mode· 7

Enabling or disabling an AP to receive all broadcast packets· 8

Configuring packet receiving timing adjustment 8

Enabling or disabling an AP to decrease the sleep interval of clients· 9

Configuring immediate packet sending· 10

Configuring channel sharing· 10

Setting the maximum number of probe response attempts· 11

Specifying a power supply mode for an AP to adjust the transmit power 11

Configuring the narrow bandwidth feature· 12

Setting the maximum interference threshold· 12

Configuring link performance optimization· 13

Configuring transmit power adjustment 13

Configuring per-packet transmit power control 14

Configuring 802.11n packet suppression· 14

Configuring fast forwarding of AP-to-client data frames· 15

Setting the maximum retransmissions and retries for an EAPOL-Key packet 16

Setting a rate limit for packets destined to radios on other APs· 16

Configuring broadcast and multicast packet control 17

Configuring broadcast and multicast packet rate limiting· 18

Configuring client fast keepalive· 18

Configuring software retransmission· 19

Enabling client inspection· 19

Configuring the packet DSCP precedence· 20

Enabling data transmission holding during roaming· 20

Enabling upstream ARP packet suppression· 21

Enabling application traffic forwarding acceleration· 21

Enabling the AP to reply ARP requests of clients on behalf of the gateway· 23

 


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 the EMR algorithm

About this task

Each 802.11 protocol supports a set of transmission rates. For example, 802.11g supports rates 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, and 54. A wireless device dynamically selects a set of transmission rates based on the channel quality and history data.

Perform this task to enable the ensure minimum rate (EMR) algorithm to ensure the connection reliability.

Restrictions and guidelines

This feature might decrease the network throughput.

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 the EMR algorithm.

option rate-algorithm emr { 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, the EMR algorithm is disabled. A radio uses a rate that ensures the maximum throughput.

Configuring dynamic directional antenna selection

About this task

This feature enables an AP to dynamically adjust its signal transmitting mode based on the signal transmitting mode and signal strength of the CPEs to improve user experience.

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 dynamic directional antenna selection.

option directional-antenna-selection { 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, dynamic directional antenna selection 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 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 smart chip protection

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 smart chip protection.

option smart-chip-protection { disable | enable 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, smart chip 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.

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.

Configuring the quiet mode

About this task

This feature is applicable only to X-share APs.

X-share APs send every packet by using two or three antennas at the same time. When this feature is enabled for an X-share AP, the AP sends each packet by using only one antenna to save resources and reduce radiation.

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 the quiet mode.

option x-share quiet { 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, the quiet mode is disabled.

Enabling or disabling an AP to receive all broadcast packets

About this task

The system detects spoofing attacks by listening for broadcast deauthentication and disassociation packets. This feature enables an AP to receive all broadcast packets so that the AP can detect spoofing attacks.

Restrictions and guidelines

This feature is not applicable to 5 GHz radios of 802.11ac APs.

Support for this feature depends on the AP model. If an AP does not support this feature, the AP will ignore the related configuration deployed by the AC.

As a best practice, disable an AP from receiving all broadcast packets if not necessary to prevent broadcast packets from affecting device operation.

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 the radio to receive all broadcast packets.

option rx-broadcast-all { 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, receiving all broadcast packets is disabled.

Configuring packet receiving timing adjustment

About this task

This feature enables an AP to adjust the timing for receiving packet to achieve the optimal receiving effect.

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 packet receiving timing adjustment.

option rx-opportunity-optimize { 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, packet receiving timing adjustment 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 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.

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 number of probe response attempts.

option probe-response-try { disable | enable 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, the maximum number of probe response attempts is not limited.

Specifying a power supply mode for an AP to adjust the transmit power

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.     Specify a power supply mode for an AP to adjust the transmit power.

option power-supply { disable | enable { local | poe | poeplus } }

By default:

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

¡     In an AP group's radio view, APs do not adjust the transmit power according to the power supply mode.

Configuring the narrow bandwidth feature

About this task

This feature is applicable to the communication based train control (CBTC) system that is not sensitive to bandwidth but sensitive to signal reliability.

Perform this task to limit the bandwidth in subways to meet the requirements of the CBTC system. When the bandwidth decreases from 20 MHz to 5 MHz, the signal strength is greatly improved. The low bandwidth also reduces the risks of signal 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 the narrow bandwidth feature.

option subway-band-width { disable | enable { 5 | 10 } }

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 narrow bandwidth feature is disabled.

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.

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.

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 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.     Enter AP view or AP group view.

¡     Enter AP view.

wlan ap ap-name

¡     Enter AP group view.

wlan ap-group group-name

3.     Configure an AP to discard broadcast and multicast packets.

rrop anti-bmc default-action deny

By default:

¡     In AP view, an AP uses the configuration in AP group view.

¡     In AP group view, an AP forwards broadcast and multicast packets through radio interfaces.

4.     Configure an AP to discard IPv6 multicast packets.

rrop anti-bmc protocol ipv6 deny

By default:

¡     In AP view, an AP uses the configuration in AP group view.

¡     In AP group view, an AP takes the default action specified by the rrop anti-bmc default-action command on IPv6 multicast packets.

5.     Configuring basic broadcast and multicast packet control.

rrop anti-bmc network { disable | { ipv4-simple | ipv6-simple | ipv4-and-ipv6-simple } enable }

By default:

¡     In AP view, an AP uses the configuration in AP group view.

¡     In AP group view, basic broadcast and multicast packet control is enabled for an IPv4 network.

Configuring broadcast and multicast packet rate limiting

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.     Configure broadcast or multicast packet rate limiting.

rrop anti-bmc { broadcast | multicast } rate-limit { disable | enable }

By default:

¡     In AP view, an AP uses the configuration in AP group view.

¡     In AP group view, broadcast or multicast packet rate limiting is disabled.

4.     Set the maximum number of broadcast or multicast packets that an AP can send per second.

rrop anti-bmc { broadcast | multicast } rate-limit pps max-pps

By default:

¡     In AP view, an AP uses the configuration in AP group view.

¡     In AP group view, the maximum number of broadcast or multicast packets that an AP can send per second is not specified.

Configuring client fast keepalive

About this task

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 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 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.

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.

Configuring the packet DSCP precedence

About this task

Perform this task to configure the DSCP precedence for TCP or UDP packets with the specified port numbers. A greater DSCP precedence value represents a higher packet priority.

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.     Specify a DSCP value for TCP packets.

rrop traffic-policy priority tcp port-num-list dscp value

By default:

¡     In AP view, an AP uses the configuration in AP group view.

¡     In AP group view, no DSCP value is specified for TCP packets.

4.     Specify a DSCP value for UDP packets.

rrop traffic-policy priority udp port-num-list dscp value

By default:

¡     In AP view, an AP uses the configuration in AP group view.

¡     In AP group view, no DSCP value is specified for UDP packets.

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.

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

By default, data transmission holding during roaming is disabled.

Enabling upstream ARP packet suppression

About this task

Perform this task to protect APs against ARP flooding attacks. If the number of ARP packets that a client sends to an AP in one second reaches the specified threshold, the AP discards all ARP packets from the client within the specified suppression period.

Restrictions and guidelines

This feature does not take effect on ARP requests for the gateway.

Procedure

1.     Enter system view.

system-view

2.     Enable upstream ARP packet suppression.

rrop ul-arp attack-suppression enable [ threshold threshold-value ] [ block-time time ]

By default, upstream ARP packet suppression is disabled.

Enabling application traffic forwarding acceleration

About this task

Perform this task to accelerate the forwarding of downstream application traffic such as voice call traffic and video conference traffic to improve user experiences.

Hardware and feature compatibility

Hardware series

Model

Product code

Feature compatibility

WX1800H series

WX1804H-PWR

EWP-WX1804H-PWR-CN

No

WX2500H series

WX2508H-PWR-LTE

WX2510H-PWR

WX2510H-F-PWR

WX2540H

WX2540H-F

WX2560H

EWP-WX2508H-PWR-LTE

EWP-WX2510H-PWR

EWP-WX2510H-F-PWR

EWP-WX2540H

EWP-WX2540H-F

EWP-WX2560H

No

MAK series

MAK204

MAK206

EWP-MAK204

EWP-MAK206

No

WX3000H series

WX3010H

WX3010H-X-PWR

WX3010H-L-PWR

WX3024H

WX3024H-L-PWR

WX3024H-F

EWP-WX3010H

EWP-WX3010H-X-PWR

EWP-WX3010H-L-PWR

EWP-WX3024H

EWP-WX3024H-L-PWR

EWP-WX3024H-F

No

WX3500H series

WX3508H

WX3508H

WX3510H

WX3510H

WX3520H

WX3520H-F

WX3540H

WX3540H

EWP-WX3508H

EWP-WX3508H-F

EWP-WX3510H

EWP-WX3510H-F

EWP-WX3520H

EWP-WX3520H-F

EWP-WX3540H

EWP-WX3540H-F

No

WX5500E series

WX5510E

EWP-WX5510E

No

WX5540E

EWP-WX5540E

Yes

WX5500H series

WX5540H

WX5560H

WX5580H

EWP-WX5540H

EWP-WX5560H

EWP-WX5580H

Yes

Access controller modules

LSUM1WCME0

EWPXM1WCME0

LSQM1WCMX20

LSUM1WCMX20RT

LSQM1WCMX40

LSUM1WCMX40RT

EWPXM2WCMD0F

EWPXM1MAC0F

LSUM1WCME0

EWPXM1WCME0

LSQM1WCMX20

LSUM1WCMX20RT

LSQM1WCMX40

LSUM1WCMX40RT

EWPXM2WCMD0F

EWPXM1MAC0F

No

Hardware series

Model

Product code

Feature compatibility

WX1800H series

WX1804H-PWR

WX1810H-PWR

WX1820H

WX1840H

EWP-WX1804H-PWR

EWP-WX1810H-PWR

EWP-WX1820H

EWP-WX1840H-GL

No

WX3800H series

WX3820H

WX3840H

EWP-WX3820H-GL

EWP-WX3840H-GL

Yes

WX5800H series

WX5860H

EWP-WX5860H-GL

Yes

Restrictions and guidelines

This feature is memory intensive. Please be cautious.

Procedure

1.     Enter system view.

system-view

2.     Enter wireless service template view.

wlan service-template service-template-name

3.     Enable application traffic forwarding acceleration.

sacp application forwarding-acceleration enable

By default, application traffic forwarding acceleration is disabled.

Enabling the AP to reply ARP requests of clients on behalf of the gateway

About this task

Perform this task to enable the AP to reply ARP requests of clients on behalf of the gateway. If the MAC address of the gateway changes during a reply period, ARP failures might occur. To resolve this issue, you can specify a limit for the number of ARP requests that the AP can reply on behalf of the gateway in a reply period. When the number of ARP requests that the AP has replied reaches the limit, the AP will forward an ARP request to the gateway and perform either of the following tasks:

·     If the gateway replies to the ARP request, the AP starts a new reply period with the new MAC address of the gateway.

·     If the gateway does not reply to the ARP request, the AP starts a new reply period with the original MAC address of the gateway.

Restrictions and guidelines

As a best practice to reduce the gateway's service load, enable this feature when the gateway's service load is heavy or the network condition is poor.

Procedure

1.     Enter system view.

system-view

2.     Enable the AP to reply ARP requests of clients on behalf of the gateway.

rrop arp ap-proxy-gateway enable [ count count ]

By default, the AP does not reply ARP requests of clients on behalf of the gateway.

 

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