Siemens EF 711 Series Betriebsanweisung PDF herunterladen (Seite 375)

Availability and Session Availability

Session Availability

SCALANCE WLC711

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

The following is the traffic flow of the topology illustrated in Figure 12-3:

• The Wireless AP establishes the active tunnel to connect to the primary SCALANCE IWLAN

Controller.

• The SCALANCE IWLAN Controller sends the configuration to the Wireless AP. This

configuration also contains the port information of the secondary SCALANCE IWLAN

Controller.

• On the basis of the secondary SCALANCE IWLAN Controller’s port information, the Wireless

AP connects to the secondary controller via the backup tunnel.

• After the connection is established via the backup tunnel, the secondary SCALANCE IWLAN

Controller sends the backup configuration to the Wireless AP.

• The Wireless AP receives the backup configuration and stores it in its memory to use it for

failing over to the secondary controller. All this while, the Wireless AP is connected to the

primary SCALANCE IWLAN Controller via the ‘active’ tunnel.

Session availability applies only to the following topologies:

• Bridge Traffic Locally at Controller

• Bridge Traffic Locally at AP

Note:

Session availability is not supported in a VNS that is configured for AAA network assignment

Events and Actions in Session Availability

In the event of a primary SCALANCE IWLAN Controller outage, or the network connectivity

failure to the primary controller, the Wireless AP:

• Sends a ‘tunnel-active-req’ request message to the secondary SCALANCE IWLAN Controller.

• The secondary SCALANCE IWLAN Controller accepts the request by sending the ‘tunnel-

activate-response’ message.

• The Wireless APapplies the backup configuration and starts sending the data. The client

devices’ authentication state is not preserved during failover.

When the fast failover takes place, a critical message is displayed in the information log of the

secondary SCALANCE IWLAN Controller.

Note:

In session availability, the maximum number of failover APs that the secondary controller can accommodate

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

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

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

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

SCALANCE IWLAN Controller, so that they may re-register with their home SCALANCE

IWLAN Controller. Foreign APs can now all be released at once by using the Foreign button on

the Access Approval screen to select all foreign APs, and then clicking Released.

To support the availability feature during a failover event, administrators need to do the

following:

1. Monitor the critical messages for the failover mode message, in the information log of the

secondary SCALANCE IWLAN Controller (in the Logs & Traces section of the SCALANCE

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