Cisco Cisco Access Registrar 4.2 Especificaciones descargar pdf (Pagina 112)

100

101

4-14

Cisco Wireless LAN Controller Configuration Guide

OL-13826-01

Chapter 4 Configuring Controller SettingsWireless Device Access

Configuring 802.11n Parameters

Using the CLI to Configure 802.11n Parameters

Using the controller CLI, follow these steps to configure 802.11n parameters.

Step 1 To enable 802.11n support on the network, enter this command:

config {802.11a | 802.11b} 11nsupport {enable | disable}

Step 2 To specify the modulation and coding scheme (MCS) rates at which data can be transmitted between the

access point and the client, enter this command:

config {802.11a | 802.11b} 11nsupport mcs tx {0-15} {enable | disable}

See the descriptions of the 0 through 15 MCS data rates in the “Using the GUI to Configure 802.11n

Parameters” section on page 4-11.

Step 3 To use the 802.11n data rates that you configured, you need to enable WMM on the WLAN. Enter this

command to do so:

config wlan wmm required wlan_id

The required parameter requires client devices to use WMM. Devices that do not support WMM cannot

join the WLAN.

Note In Layer 2 LWAPP mode when WMM is enabled on any WLAN, the access point sends its

priority information on the 802.1q PRI field, with VLAN ID 0 based on the WMM clients’ QoS

control fields. In Layer 3 LWAPP mode, this information is carried in the DSCP of the LWAPP

packet’s IP header. Some non-Cisco access switches to which the access point is connected

might handle VLAN tag ID 0 inappropriately. For example, the switch might drop packets that

are tagged with VLAN ID 0, causing the access point with WMM enabled to be unable to join

the controller in Layer 2 LWAPP mode and to reboot repeatedly. Therefore, when the controller

is in Layer 2 mode and WMM is enabled, you must put the access points on the trunk port of the

switch to enable them to join the controller. If the access point is unable to join the controller

after connecting to the trunk port of the switch, you must use the controller in Layer 3 LWAPP

mode in order to use WMM.

Step 4 To specify the aggregation method used for 802.11n packets, follow these steps:

a. To disable the network, enter this command:

config {802.11a | 802.11b} disable network

b. To specify the aggregation method, enter this command:

config {802.11a | 802.11b} 11nsupport a-mpdu tx priority {0-7 | all} {enable | disable}

Aggregation is the process of grouping packet data frames together rather than transmitting them

separately. Two aggregation methods are available: Aggregated MAC Protocol Data Unit

(A-MPDU) and Aggregated MAC Service Data Unit (A-MSDU). A-MPDU is performed in the

software whereas A-MSDU is performed in the hardware.

You can specify the aggregation method for various types of traffic from the access point to the

clients. Table 4-1 defines the priority levels (0-7) assigned per traffic type.

1 2 ... 107 108 109 110 111 112 113 114 115 116 117 ... 635 636

Comentarios a estos manuales

Sin comentarios

Cisco Cisco Access Registrar 4.2 Especificaciones Pagina 112

Comentarios a estos manuales