Wireless/Redundant Edge Services xl Module Management and Configuration Guide WS.02.xx and greater

10-3
Redundancy Groups
High Availability for Wireless Services
The redundant module has its own software image and configuration file.
Before a redundant module can deliver wireless services for your network,
you must configure it to provide those services—just as you would configure
a primary module.
Redundancy Group
A redundancy group can contain up to twelve modules:
■ at least one Wireless Edge Services xl Module
■ up to 11 other Wireless Edge Services xl Modules or Redundant Wireless
Services xl Modules, in any combination
For example, the group can include one Wireless Edge Services xl Modules
(primary module) and two Redundant Wireless Services xl Module (redundant
modules). Or it can include eight primary modules and four redundant modules.
However, the typical configuration includes one primary module and one or
more redundant modules. This is because adding modules to the group does not
add licenses, as explained in “RP Licensing for Redundancy Groups” on page
10-6.
You can install up to two modules in a wireless services-enabled switch. For
higher availability, you should install modules in separate switch chassis. Then
if one wireless services-enabled switch becomes unavailable—due to a cable
failure, for example—the other wireless services-enabled switch can still
provide the wireless services that your company needs. (See Figure 10-1.)