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Availability and Session Availability
Session Availability
SCALANCE WLC711
12-10 C79000-G8976-C260-03, 07/2012, User Guide, V8.11
Figure 12-2 AP Fail Over to 2ndary Controller When Connectivity to Primary Fails
The secondary SCALANCE IWLAN Controller does not have to detect its link failure with the
primary SCALANCE IWLAN Controller for the session availability to kick in. If the Wireless AP
loses five consecutive polls to the primary controller either due to the controller outage or
connectivity failure, it fails over to the secondary controller fast enough to maintain the user
session.
In session availability mode (Figure 12-3), the Wireless APs connect to both the primary and
secondary SCALANCE IWLAN Controllers. While the connectivity to the primary SCALANCE
IWLAN Controller is via the “active” tunnel, the connectivity to the secondary SCALANCE
IWLAN Controller is via the “backup” tunnel.
Figure 12-3 Session Availability Mode
Secondary ControllerPrimary Controller
Wireless AP
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