LevelOne GTL-2691 - Manual (Page 86)

C HAPTER 2 | Initial Switch Configuration
Stack Operations
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S TACK O PERATIONS
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 of the switch, and then select the appropriate unit number from
the web or console management interface.
S ELECTING THE S TACK
M ASTER
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 Master Select push button is depressed on only one unit in
the stack, that unit will serve as the stack Master.
■
If the Master Select push button is depressed on more than one
unit, the system will select the unit with the lowest MAC address
from those with the push button depressed as the stack Master.
■
If the Master Select push button is not depressed 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. It can also be
selected on the front panel graphic of the web interface, or from the
CLI.
◆ 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.