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SCALANCE WLC711

User Guide, V8.11, 07/2012, C79000-G8976-C260-03 12-1

Availability and Session Availability

This chapter describes the availability feature, including:

Availability

The SCALANCE IWLAN Controller Software system provides the availability feature to maintain

service availability in the event of a SCALANCE IWLAN Controller outage.

Note:

During the failover event, the maximum number of failover APs the secondary controller can accommodate is

equal to the maximum number of APs supported by the hardware platform.

Wireless APs that attempt to connect to the secondary controller during a failover event are

assigned to the WLAN Service that is defined in the system’s default AP configuration, provided

the administrator has not assigned the failover Wireless APs to one or more VNSs. If a system

default AP configuration does not exist for the controller (and the administrator has not assigned

the failover Wireless APs to any WLAN Service), the APs will not be assigned to any WLAN

Service during the failover.

A SCALANCE IWLAN Controller will not accept a connection by a foreign AP if the SCALANCE

IWLAN Controller believes its availability partner controller is in service.

Also, the default Wireless AP configuration assignment is only applicable to new APs that failover

to the backup controller. Any Wireless AP that has previously failed over and is already known to

the backup system will receive the configuration already present on that system. For more

information, see “Configuring the Default Wireless AP Settings” on page 3-53.

During the failover event when the Wireless AP connects to the secondary controller, the users are

disassociated from the Wireless AP. Consequently, the users must log on again and be

authenticated on the secondary controller before the wireless service is restored.

Note:

If you want the mobile user’s session to be maintained, you must use the ‘session availability’ feature that

enables the primary controller’s Wireless APs to failover to the secondary controller fast enough to maintain

the session availability (user session). For more information, see “Session Availability” on page 12-9.

For information about... Refer to page...

Availability 12-1

Session Availability 12-9

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Siemens EF 711 Series Guía de usuario Pagina 365