Extreme Networks Summit WM User Manual page 239

Figure 21: The Altitude AP fails over the secondary controller when the network connectivity to he
primary controller fails
The secondary Summit WM Controller does not have to detect its link failure with the primary Summit
WM Controller for the session availability to kick in. If the Altitude AP looses 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 the session availability mode, the Altitude APs connect to both the primary and secondary Summit
WM Controllers. While the connectivity to the primary Summit WM Controller is via the "active"
tunnel, the connectivity to the secondary Summit WM Controller is via the "backup" tunnel.
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Summit WM User Guide, Software Version 5.3