Merging Two Operational Stacks
We recommend using the following procedure for
merging two operational stacks:
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Always power off all units in one stack before connecting to another stack.
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Add the units as a group by unplugging one stacking cable in the operational stack and physically connecting all unpowered units.
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Completely cable the stacking connections, making sure the redundant link is also in place.
Two operational stacks can also be merged by
reconnecting stack cables without powering down all units in one stack. Connecting a
powered-up standalone unit to an existing stack leads to same behavior as when merging two
operational stacks. In such cases, the Manager re-election is done based on the rules
listed in
Stack Manager Election and Re-Election. One of the
two managers wins the election and the losing stack manager reboots itself and all its
member units. After the reboot, all of the losing stack members join the winning stack to
form a single stack. The winning stack remains functional through the merge process. If the
stack merge is performed in this way, then we strongly recommend setting the priority of
the desired winner stack manager to a higher value than the stack manager that should lose
the election.
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