WESM zl Management and Configuration Guide WT.01.28 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 four modules can be installed in the same
wireless services-enabled switch.
Within the redundancy group, you can combine primary and redundant modules 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 zl Module with the default license (supporting 12
RPs) and one additive license (supporting 48 RPs)
■ one Wireless Edge Services zl Module with the default license (supporting 12
RPs)
■ one Redundant Wireless Services zl Module
This redundancy group has two RP licenses and a group authorization level for 60
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 zl Module with the default license and optional
additive licenses (supporting a maximum total of 156 RPs)
■ one or more Redundant Wireless Services zl Modules