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

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Introduction
Redundancy Groups
Rules of Redundancy Groups
A redundancy group consists of up to 12 members; each member is either a
primary module or a redundant module. Up to two modules can be installed
in the same wireless services-enabled switch.
Within the redundancy group, you can combine primary and redundant mod-
ules in any proportion. For example, you could have two primary modules and
one redundant module; or you could group three primary modules and four
redundant modules. However, because only primary modules have RP
licenses, the group must include at least one primary module.
When designing a redundancy group, you must consider RP licenses. A
redundancy group shares RP licenses. Any member of the group can draw on
the group’s licenses to adopt RPs (although the member’s operation mode
determines when the member can actually use the RP licenses).
The total number of RPs that a redundancy group can adopt is set by the group
authorization level, which matches the authorization level of the single group
member with the greatest number of licenses. Members’ licenses are not
added together.
For this reason, it is recommended that a redundancy group be based on a
single primary module. If you want to add more modules to the group, add
another redundant module rather than another primary module.
For example, suppose that a group includes these members:
■ one Wireless Edge Services xl Module with the default license (supporting
12 RPs) and one additive license (supporting 12 RPs)
■ one Wireless Edge Services xl Module with the default license (supporting
12 RPs)
■ one Redundant Wireless Services xl Module
This redundancy group has two RP licenses and a group authorization level
for 24 RPs. The second primary module did not contribute its licenses, so you
could add the same capabilities by adding a second redundant module.
The following group is the recommended group:
■ one Wireless Edge Services xl Module with the default license and zero
to three additive licenses (supporting a maximum total of 48 RPs)
■ one or more Redundant Wireless Services xl Modules