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Availability and Session Availability

SCALANCE WLC711

12-2 C79000-G8976-C260-03, 07/2012, User Guide, V8.11

The availability feature provides Wireless APs with a list of local active interfaces for the active

controller as well as the active interfaces for the backup controller. The list is sorted by top-down

priority.

If the connection with an active controller link is lost (poll failure), the Wireless AP automatically

scans (pings) all addresses in its availability interface list. The Wireless AP then connects to the

highest priority interface that responds to its probe.

Events and Actions in Availability

If one of the SCALANCE IWLAN Controllers in a pair fails, the communication between the two

SCALANCE IWLAN Controllers stops. This triggers a failover condition and a critical message is

displayed in the information log of the secondary SCALANCE IWLAN Controller.

After a Wireless AP on the failed SCALANCE IWLAN Controller loses its connection, it will try to

connect to all enabled interfaces on both controllers without rebooting. If the Wireless AP is not

successful, it will begin the discovery process. If the Wireless AP is not successful in connecting to

the SCALANCE IWLAN Controller after five minutes of attempting, the Wireless AP will reboot if

there is no Bridge traffic locally at the AP topology associated to it.

All mobile user’s sessions using the failover Wireless AP will terminate except those associated to

a Bridge traffic locally at the AP and if the Maintain client sessions in event of poll failure

option is enabled on the AP Properties tab or AP Default Settings screen.

When the Wireless APs connect to the second SCALANCE IWLAN Controller, they are either

assigned to the VNS that is defined in the system’s default AP configuration or manually

configured by the administrator. The mobile users log on again and are authenticated on the

second SCALANCE IWLAN Controller.

When the failed SCALANCE IWLAN Controller recovers, each SCALANCE IWLAN Controller in

the pair goes back to normal mode. They exchange information including the latest lists of

registered Wireless APs. The administrator must release the Wireless APs manually on the second

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Siemens EF 711 Series Podręcznik Użytkownika Strona 366