H3C MSR Series Configuration Manual

Also see for MSR Series: Troubleshooting guide Command reference Configuration guide Manual Configuration guide

Contents

H3C MSR Series Configuration Manual Manual pdf 71 page image

64receives the trigger packet, packets in the transmit queue are sent. The number of sent packetsdepends on the agreement made when the client was admitted. AC queues without the deliveryattribute store and transmit packets as defined in the 802.11 protocol.SVPSVP can assign packets with the protocol ID 119 in the IP header to a specific AC queue. SVPstipulates that random backoff is not performed for SVP packets. Therefore, you can set bothECWmin and ECWmax to 0 when there are only SVP packets in an AC queue.ACK policyWMM defines two ACK policies:• No ACK—When the no acknowledgement (No ACK) policy is used, the recipient does notacknowledge received packets during wireless packet exchange. This policy is suitable in theenvironment where communication quality is fine and interference is weak. While the No ACKpolicy helps improve transmission efficiency, it can cause increased packet loss whencommunication quality deteriorates. This is because when this policy is used, a sender does notretransmit packets that have not been received by the recipient.• Normal ACK—When the Normal ACK policy is used, the recipient acknowledges eachreceived unicast packet.Protocols and standards• 802.11e-2005, Amendment 8: Medium Access Control (MAC) Quality of ServiceEnhancements, IEEE Computer Society, 2005• Wi-Fi, WMM Specification version 1.1, Wi-Fi Alliance, 2005Hardware compatibility with WLANWLAN is not available on the following routers:• MSR 2600.• MSR 30-11.• MSR 30-11E.• MSR 30-11F.• MSR3600-51F.Configuring WMMConfiguration restrictions and guidelines• If CAC is enabled for an AC queue, CAC is also enabled for the AC queues with higher priority.For example, if you use the wmm edca client command to enable CAC for the AC-VI queue,CAC is also enabled for the AC-VO queue. However, enabling CAC for the AC-VO queue doesnot enable CAC for the AC-VI queue.• H3C recommends that you use the default EDCA parameter settings for APs and clients(except the TXOPLimit parameter for devices using 802.11b radio cards) unless it is necessaryto modify the default settings.• When the radio card of a device is 802.11b, H3C recommends that you set the TXOPLimitvalues of the AC-BK, AC-BE, AC-VI, and AC-VO queues to 0, 0, 188, and 102, respectively.• The SVP packet mapping function takes effect only after you enable WMM.