WESM zl Management and Configuration Guide WT.01.28 and greater

10-32
Redundancy Groups
Configuring a Redundancy Group
Reverting RPs Adopted by a Standby Member to the Active
Member
When an active member of a redundancy group fails, a standby member of the group
adopts the RPs. For continuity of service, the standby member continues to support
the RPs even when the active member comes back online. However, eventually you
may want to return the RPs to the original module.
You can manually revert a standby module, which means that you force it to unadopt
all of its RPs. Only revert a module when you can afford a disruption to network
service for the minute or two during which RPs become adopted by the active module.
You are allowed to revert a module when all of these conditions are met:
■ The module is a standby member of the group.
■ The module has adopted a failed member’s RPs.
■ The module has detected that the failed member has returned online.
If the module has adopted RPs from more than one failed member, all must be
recovered.
Note Your redundancy group configuration might define multiple modules as active
members. In some circumstances, another active member can adopt a failed mem-
ber’s RPs. (See “Redundancy Group Behavior When a Member Fails” on page
10-10.) However, you cannot revert an active member.
Follow these steps to have a standby member relinquish its RPs:
1. Select Network Setup > Redundancy Group > Configuration.
2. Click the Revert Now button.
The button is active only if the three conditions described above are met.