Technical data

Adding an ESS with the CLI

controller(config-essid)#

To remove a VLAN assignment from an ESSID, use the no vlan name command. The

following example removes the VLAN assignment from the ESSID:

controller(config-essid)# no vlan corp

controller(config-essid)#

WMM Features Supported by System Director

In general, WMM contains these features:

 WMM (for QoS)

 WMM PS (U-APSD) - helps with battery life

 WMM AC (TSPEC) - admission control

System Director supports WMM packet tagging for QoS on AP300, AP400, and AP1000

automatically (if the client is WMM); this feature cannot be turned off. System

Director supports U-APSD on AP300/AP400/AP1000; this can be turned on and off.

System Director does not support WMM AC (TSPEC).

U-APSD is ideally suited to mobile devices that require advanced power-save mech-

anisms for extended battery life, and for applications like VoIP where the user expe-

rience rapidly degrades as latency increases. WMM Power Save was designed for

mobile and cordless phones that support VoIP. See the chart below for defaults and

possible configurations of both the WMM QoS and WMM APSD features.

WMM-PS is an enhancement over the legacy power-save mechanisms supported by

Wi-Fi networks. It allows devices to spend more time in a “dozing” state, which

consumes less power, while improving performance by minimizing transmission

latency. Furthermore, U-APSD promotes more efficient and flexible over-the-air

transmission and power management by enabling individual applications to control

capacity and latency requirements.

U-APSD capable stations download frames buffered from AP300/AP400/AP1000s

during unscheduled Service Periods (SP); the result is that there is no wait for

beacons as there is in the legacy method. For U-APSD capable stations, APs negotiate

U-APSD and use it to transmit data for the WMM Access Categories (priority levels)

negotiated for U-APSD when a station is in power save mode. When a device is in

power-save mode, the uplink data frame triggers AP300/AP400/AP1000 to send

frames buffered in U-APSD enabled WMM_AC-queues. Pending legacy mode frames

are not transmitted. You can configure AP300/AP400/AP1000 U-APSD support from

Note:

If a deployment utilizing AP1000 models has WMM or WMM-APSD VoIP

phones in use with DSCP set to Expedited Forwarding, a special QoS rule

must be configured to support the deployment. This rule must have a

DSCP parameter value of CS6 or CS7 in order to ensure that the AP1000

queues packets properly, ensuring optimal call quality.