Dell PowerConnect PC7048R-RA Stacking Instructions - Page 9
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Stacking Dell PowerConnect 7000 Series Switches
Selecting the Master Unit
A stack manager is elected or re-elected based on the following considerations, in order:
Whether the switch that was previously the stack manager.
Whether the switch has the higher MAC address.
When you add a switch to the stack, one of the following scenarios takes place:
If the switch has the Management Unit function enabled but another Master unit is
already active, then the switch changes its configured Management Unit value to
disabled.
If the Management Unit function is unassigned and there is another Management Unit in
the system then the switch changes its configured Management Unit value to disabled.
If the Management Unit function is enabled or unassigned and there is no other
Management Unit in the system, then the switch becomes Management Unit.
If the Management Unit function is disabled, the unit remains a non-management unit.
You can manually set the unit number for the switch. To avoid unit-number conflicts, one of the
following scenarios takes place when you add a new member to the stack:
If the switch has a unit number that is already in use, then the unit that you add to the
stack changes its configured unit number to the lowest unassigned unit number.
If the switch you add does not have an assigned unit number, then the switch sets its
configured unit number to the lowest unassigned unit number.
If the unit number is configured and there are no other devices using the unit number,
then the switch starts using the configured unit number.
If the switch detects that the stack already has the maximum number of units, making
it unable to assign a unit number, then the switch sets its unit number to "unassigned"
and does not participate in the stack.
If a new switch is added to a stack of switches that are already powered and running and already have
an elected Master unit, the newly added switch becomes a stack member rather than the Master. On
the Master unit, if there is no saved configuration for the newly added unit, it applies the default
configuration. If there is a saved configuration on the Master for the newly added unit, it would apply
the saved configuration to the new unit. If the entire stack is powered OFF and ON again, the unit that
was the Master before the reboot will remain the Master unit after the stack resumes operation.
Selecting the Standby Unit
When the stack is formed, one of the units is automatically selected as the Standby unit for the stack.
The Standby unit takes over as Manager if the current Manager fails.
To configure the Standby unit using the CLI, use the standby command in Stack Configuration Mode.
To configure the Standby unit via the Web interface, view the Stacking > Unit Configuration page and
select Standby for the Unit Type.
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