Availability and session availability
Summit WM User Guide, Software Version 5.3240
Figure 22: Session availability mode
The following is the traffic flow of the topology illustrated in Figure 22:
z The Altitude AP establishes active tunnel to connect to the primary Summit WM Controller.
z The Summit WM Controller sends the configuration to the Altitude AP. This configuration also
contains the port information of the secondary Summit WM Controller.
z On the basis of the secondary Summit WM Controller's port information, the Altitude AP connects
to the secondary controller via the backup tunnel.
z After the connection is established via the backup tunnel, the secondary Summit WM Controller
sends the backup configuration to the Altitude AP.
z The Altitude 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 Altitude AP is connected to the primary Summit
WM Controller via the "active" tunnel.
Events and actions in session availability
In the event of the primary Summit WM Controller outage, or the network connectivity failure to the
primary controller, the Altitude AP:
z Sends 'tunnel-active-req' request message to the secondary Summit WM Controller.
z The secondary Summit WM Controller accepts the request by sending the 'WASSP-tunnel-activate-
response message.
z The Altitude AP applies 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 Summit WM Controller.
Primary Controller
Secondary Controller
Altitude AP
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