Manage Stacking and Redundancy
300
ProSAFE Wireless Controller
The following figure shows an N:1 configuration with three primary controllers and one
redundant controller after a failover occurs:
Figure 24. Primary and redundant controllers in an N:1 configuration after a failover
Configure a Redundancy Group With N:1 Redundancy
To enable N:1 redundancy, configure the redundancy settings on the primary controllers (the
master and one or two slaves) and on the redundant controller (the secondary controller) that
serves all primary controllers. All controllers require matching licenses. If licenses do not
match, redundancy cannot be established. For additional requirements, see Requirements
and Restrictions for N:1 Redundancy on page 298.
An N:1 redundancy group includes two or three primary controllers that usually operate as a
stack:
• To configure redundancy for a stack of two controllers, you need three controllers: Two
primary controllers (one master and one slave) and one redundant controller that serves
both primary controllers.
• To configure redundancy for a stack of three controllers, you need four controllers: Three
primary controllers (one master and two slaves) and one redundant controller that serves
the three primary controllers.
For information about configuring a stack of controllers, see Configure a Stack of Wireless
Controllers on page 283.
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