Specifications

Summit WM Technical Reference Guide, Software Version 5.3 123
13 Availability and session availability
The Summit WM Software system provides the “availability” feature to maintain service availability in
the event of a Summit WM Controller outage.
Network topology for fast failover and session
availability
The interruption in service for fast failover and session availability should be less than 5 seconds. To
achieve fast failover and session availability, a layer 2 networking environment should be employed, as
shown in Figure 25.
The 5 second or less traffic interruption is guaranteed for the clients that are associated on session
availability enabled WM-ADs and had incoming traffic at the time of the failover. This scenario most
often occurs with active voice calls.
Figure 25: Layer 2 networking environment for fast failover and session availability
DHCP
server
NTP
server
RADIUS
server
Primary Controller
Secondary Controller
Layer 2
Switch
Layer 2
Switch