Extreme Networks Summit WM User Manual page 242

Availability and session availability
NOTE
The 'fast failover' feature is a pre-requisite for session availability. To configure session availability, you must first
configure the fast failover feature. For more information on how to configure fast failover, see
failover" on page
In session availability, the user is able to retain the IP address. In addition, the user does not have to re-
authenticate after the failover. These characteristics ensure that the failover is achieved within 5 seconds,
which is fast enough to maintain the user's session.
NOTE
In session availability, the fast failover is achieved within 5 seconds only if there is at least one client device (mobile
unit) associated to the Altitude AP. In the absence of any client device, the Altitude AP takes more time to failover
since there is no need to preserve the user session.
NOTE
The session availability feature is a WM-AD attribute. It applies only to the following WM-ADs:
- Bridge Traffic Locally at WM
- Bridge Traffic Locally at AP
The users, who are on the conventional Routed WM-AD, are not benefitted by the session availability
feature.
NOTE
Session availability is not support in a WM-AD that is configured for AAA network assignment.
Authentication state during failover
The authentication state is not preserved during fast failover. If a WM-AD requires authentication, the
client device must re-authenticate. However, in such a case, the session availability is not guaranteed
because authentication may require additional time during which the user session may be disrupted.
You must always use the following authentication mechanism for the fast failover configuration:
Wired Equivalent Privacy (WEP)
Wi-Fi Protected Access Privacy-Pre-Shared Key (WPA-PSK)
NOTE
Session availability is not supported in a WM-AD that uses Captive Portal (CP) authentication.
NOTE
Session availability does not support user-specific filters as these filters are not shared between the primary and
secondary Summit WM Controllers.
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"Configuring fast
Summit WM User Guide, Software Version 5.3