Chapter 2: Virtual Chassis Stacking
86
The table columns are described in Table 19.
Table 19. Stacking Worksheet Columns
Column Description
Location You use this column to write down the physical
locations of the devices, such as their buildings or
equipment rooms. The information can be useful
in locating the switches of the stack if they are in
different locations.
ID Each switch in a stack has to have a unique ID
number, in the range of 1 to 8. They display the
numbers on the ID LEDs on the front panels and
you use the numbers to configure the individual
ports. Allied Telesis recommends assigning the ID
1, the default value, to the master switch. You
should decide ahead of time, before beginning the
configuration procedures, the ID assignments of
the switches.
Priority When the switches of a stack are reset or powered
on, they perform an initialization process that
involves, in part, choosing the master switch. The
selection is based on their priority numbers and
MAC addresses. The former is an adjustable
parameter with a range of 0 to 255 and a default
value of 128. The lower the value, the higher the
priority. Thus, the switch with the lowest value
becomes the stack master.
If switches have the same priority number, the
master is selected based on their MAC addresses.
Again, as with priority numbers, the lower the MAC
address, the higher the priority.
Allied Telesis recommends setting each switch’s
priority value to match its ID value. This is to
ensure that the switch you have chosen to be the
master unit will indeed function in that role.
Additionally, it will make it possible for you to know
the order in which the switches assume the master
role if the primary master should fail or be
powered off.
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