Allied Telesis AT-S63 - Manual (Page 41)

AT-S63 Stack Command Line User’s Guide
Section I: Basic Operations 41
Guidelines Here are the guidelines for module ID numbers:
ˆ Each switch must have a unique module ID number.
ˆ The module ID numbers are set with the SET STACK command and
displayed with the SHOW STACK command. The SET STACK
command should only be used when a switch is operating as a stand-
alone device. Setting a switch’s module ID number while it is part of a
stack can have unpredictable results. For information, refer to “SET
STACK” on page 70 and “SHOW STACK” on page 72.
ˆ If you use static module ID numbers, number the devices starting at 1.
ˆ The switch assigned the dynamic or static module ID number 1 is the
master switch of the stack.
ˆ If you use static module ID numbers, the switch assigned module ID
number 2 functions as the backup master switch. Dynamic module ID
numbers do not support a backup master switch.
ˆ Static module ID numbers do not have to be consecutive (for example,
1, 2, 4), but this is not recommended because it can make it difficult to
match a switch with its appropriate module ID number, which in turn
could lead to mistakes when configuring the devices.
ˆ The parameter settings in the active configuration file on the master
switch are tied to the module ID numbers. If, for any reason, the
numbering sequence of the devices in a stack changes, which can
happen with dynamic module ID numbers, a mismatch could result
between the devices and their corresponding parameter settings in the
file. It is because of this that Allied Telesis recommends controlling the
assignment of the module ID numbers with static numbers.
ˆ The module ID numbers of the switches do not have to match the
physical arrangement of the units in the stack. For example, any switch
in a stack can be assigned module ID number 1 and so be the master
switch. However, if you are assigning static numbers, the units will be
easier to identify if they are numbered in either ascending or
descending order in the equipment rack.
ˆ The module ID numbers of the switches in a stack must be all static or
dynamic. A stack will not function if some of the numbers are static and
others are dynamic.
ˆ A switch should be assigned a module ID number while it is operating
as a stand-alone device, before it is added to a stack. If you need to
change a switch’s module ID number after the unit is added to a stack,
disconnect the stacking cables from the device’s AT-StackXG Stacking
Module.
ˆ A change with the SET STACK command to a switch’s module ID
number takes affect the next time the device is reset or power cycled.
ˆ You do not have to perform the SAVE CONFIGURATION command
after changing a device’s module ID number. The new module ID
number is automatically saved in a hidden file in the unit’s file system
after you enter the SET STACK command.