Siemens EF 711 Series Guia do Utilizador descarregar pdf (Página 374)

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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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