Specifications

Availability and session availability
Summit WM Technical Reference Guide, Software Version 5.3124
Fast failover and session availability deployment
scenarios
The session availability timing is not guaranteed for setups where there is a WAN link between the
Summit WM Controllers or between the Summit WM Controllers and the Wireless APs. In addition,
other propagation delays due to network layout may affect session availability performance.
The following describes deployment scenarios when the Altitude AP failover time may be longer than 5
seconds:
● The Altitude AP does not have session availability enabled WM-ADs
● The Altitude AP has session availability enabled WM-ADs, but there are no active clients associated
on these WM-ADs
● The Altitude AP has session availability enabled WM-ADs, there are clients associated on these WM-
ADs, but there is no incoming traffic for these clients.
When to use fast failover
Fast failover has been designed to allow Wireless APs from a Summit WM Controller to fail over to the
surviving Summit WM Controller very quickly. In order to achieve the quick failover result, fast polling
between Summit WM Controllers forming availability pairs and between Wireless APs and Summit
WM Controllers is required. Because fast polling requires small delays in the network, it is
recommended that fast failover is used in switched Ethernet environments.
Although fast failover can be implemented in WAN environments if the appropriate poll timeouts are
configured, the 5 second or less traffic interruption is NOT guaranteed in this type of network
environment.