WESM zl Management and Configuration Guide WT.01.28 and greater

10-3
Redundancy Groups
High Availability for Wireless Services
Redundancy Group
A redundancy group can contain up to twelve modules:
■ at least one Wireless Edge Services zl Module
■ up to 11 other Wireless Edge Services zl Modules or Redundant Wireless
Services zl Modules, in any combination
For example, the group can include one Wireless Edge Services zl Modules (primary
module) and two Redundant Wireless Services zl 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 four 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.)