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Overview of the SCALANCE WLC711 Solution

SCALANCE WLC711 and Your Network

SCALANCE WLC711

1-14 C79000-G8976-C260-03, 07/2012, User Guide, V8.11

If the primary SCALANCE IWLAN Controller fails, all of its associated Wireless APs can

automatically switch over to another SCALANCE IWLAN Controller that has been defined as the

secondary or backup controller. If an AP reboots, the primary SCALANCE IWLAN Controller is

restored if it is active. However, active APs will continue to be connected to the backup controller

until the administrator releases them back to the primary home controller.

Quality of Service (QoS)

SCALANCE WLC711 solution provides advanced Quality of Service (QoS) management to

provide better network traffic flow. Such techniques include:

• WMM (Wi-Fi Multimedia) — WMM is enabled per WLAN service. The SCALANCE IWLAN

Controller provides centralized management of the AP features. For devices with WMM

enabled, the standard provides multimedia enhancements for audio, video, and voice

applications. WMM shortens the time between transmitting packets for higher priority traffic.

WMM is part of the 802.11e standard for QoS. In the context of the SCALANCE IWLAN

Solution, the ToS/DSCP field is used for classification and proper class of service mapping,

output queue selection, and priority tagging.

• IP ToS (Type of Service) or DSCP (Diffserv Codepoint) — The ToS/DSCP field in the IP

header of a frame indicates the priority and class of service for each frame. Adaptive QoS

ensures correct priority handling of client payload packets tunneled between the controller

and AP by copying the IP ToS/DSCP setting from client packet to the header of the

encapsulating tunnel packet.

• Rate Control — Rate Control for user traffic can also be considered as an aspect of QoS. As

part of Policy definition, the user can specify (default) policy that includes Ingress and Egress

rate control. Ingress rate control applies to traffic generated by wireless clients and Egress rate

control applies to traffic targeting specific wireless clients. The bit-rates can be configured as

part of globally available profiles which can be used by any particular configuration. A global

default is also defined.

Quality of Service (QoS) management is also provided by:

• Assigning high priority to a WLAN service

• Adaptive QoS (automatic and all time feature)

• Support for legacy devices that use SpectraLink Voice Protocol (SVP) for prioritizing voice

traffic (configurable)

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Siemens EF 711 Series Guide de l'utilisateur Page 30