Chapter 1
| Initial Switch Configuration
Stack Operations
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Stack Operations
Up to eight switches can be stacked together as described in the Installation Guide.
One unit in the stack acts as the Master for configuration tasks and firmware
upgrade. All of the other units function in Slave mode, but can automatically take
over management of the stack if the Master unit fails.
To configure any unit in the stack, first verify the unit number from the front panel
indicator on the switch, and then select the appropriate unit number from the web
or console management interface.
Selecting the
Stack Master
Note the following points about unit numbering:
◆ When the stack is initially powered on, the Master unit is selected based on the
following rules:
■
If the stack master button has been enabled with the switch master button
command on only one unit in the stack, that unit will serve as the stack
Master.
■
If the stack master button has been enabled on more than one unit, the
system will select the unit with the lowest MAC address as the stack Master
from those with the stack master button enabled.
■
If the stack master button is not enabled on any unit, the system will select
the unit with the lowest MAC address as the stack Master.
◆ When the stack is initially powered on, the Master unit is designated as unit 1
for a ring topology. For a line topology, the stack is simply numbered from top
to bottom, with the first unit in the stack designated at unit 1. This unit
identification number appears on the Stack Unit ID LED on the front panel of
the switch. Any unit in the stack can be selected on the front panel graphic of
the web interface (from the Unit scroll-down list), or from the CLI (as specified
by the “unit” parameter for applicable commands).
◆ If the Master unit fails and another unit takes over control of the stack, the unit
numbering will not change.
◆ If a unit in the stack fails or is removed from the stack, the unit numbers will not
change. This means that when you replace a unit in the stack, the original
configuration for the failed unit will be restored to the replacement unit.
◆ If a unit is removed from the stack and later reattached to the stack, it will retain
the original unit number obtained during stacking.
◆ If a unit is removed from the stack, and powered up as a stand-alone unit, it will
also retain the original unit number obtained during stacking.
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