SMC Networks TigerSwitch, Management Manual

Page: 41 / 518

S
TACK
O
PERATIONS
2-5
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.
To configure any unit in the stack, first verify the unit number by counting
down from the Master unit, 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 designated as
unit 1. The stack is simply numbered from top to bottom, with the first
unit in the stack designated at unit 1. This unit identification number
can be selected on the front panel graphic of the web interface, or from
the CLI.
• If more than one stack Master is selected using the Master push button
on the switch’s front panel, the stack will not function.
• If any unit fails, the stack will not function. You must replace the failed
unit, and reconnect the stacking cables to restore a ring topology.
• 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.
Recovering from Stack Failure or Topology Change
When a link or unit in the stack fails, a trap message is sent and a failure
event is logged. The stack will be rebooted after any system failure or
topology change. It takes two to three minutes for the stack to reboot.
Also note that powering down a unit or inserting a new unit in the stack
will cause the stack to reboot.