
Availability and Session Availability
Session Availability
SCALANCE WLC711
User Guide, V8.11, 07/2012, C79000-G8976-C260-03 12-13
• Time on all the network elements (both the SCALANCE IWLAN Controllers in availability
pair, Wireless APs, DHCP and RADIUS servers etc.) is synchronized. For more information,
see “Configuring Network Time” on page 2-49.
Note:
The fast failover feature works optimally in fast networks (preferably switched networks).
To Configure Fast Failover and Enable Session Availability:
1. Log on to both the primary and secondary SCALANCE IWLAN Controllers.
2. From the top menu of the primary SCALANCE IWLAN Controller, click Wireless Controller.
The Wireless Controller Configuration screen is displayed.
3. In the left pane, click Availability.
4. Under Controller Availability Settings, select Paired.
5. Select the Fast Failover checkbox.
6. Type the appropriate value in the Detect link failure box.
The Detect link failure field specifies the period within which the system detects link failure
after the link has failed. For fast failover configuration, this parameter is tied closely to the
Poll Timeout parameter on the AP Properties tab Advanced dialog. The Poll Timeout field
specifies the period for which the Wireless AP waits before re-attempting to establish a link
when its polling to the primary SCALANCE IWLAN Controller fails.
For the fast failover feature to work within 5 seconds, the Poll Timeout value should be 1.5 to
2 times the Detect link failure value. For example, if you have set the Detect link failure
value to 2 seconds, the Poll Timeout value should be set to 3 or 4 seconds.
Comentarios a estos manuales