User guide

Availability and Session Availability
Session Availability
SCALANCE WLC711
User Guide, V8.11, 07/2012, C79000-G8976-C260-03 12-15
After you have configured fast failover, you can verify session availability to preserve the user
session during the failover.
Verifying Session Availability
To have session availability, you must ensure the following:
• The primary and secondary SCALANCE IWLAN Controllers are properly configured in
‘availability’ mode. For more information, see “Availability” on page 12-1.
• The fast failover feature is properly configured. For more information, see “Configuring Fast
Failover and Enabling Session Availability” on page 12-12.
Note:
If you haven’t configured the fast failover feature, the Enable Session Availability checkbox is not displayed.
• 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.
• Both the SCALANCE IWLAN Controllers in fast failover mode must be running the most
recent SCALANCE IWLAN Convergence Software release.
• If you are using Bridge Traffic Locally at Controller topology, you must select None from the
DHCP Option drop-down menu.
• The Bridge Traffic Locally at Controller must be mapped to the same VLAN on both the
primary and secondary SCALANCE IWLAN Controllers.