Allied Telesis AT-S63 - Manual (Page 40)

Chapter 1: Overview
40 Section I: Basic Operations
command. A switch can have only one stack priority value. The lower the
number, the higher the priority. The switch with the lowest stack priority is
assigned module ID 1 and becomes the master switch. The switch with
the next lowest priority is assigned module ID 2, and so on. In cases
where switches have the same priority value, ID number assignments are
based on MAC addresses, as explained previously.
The range of the stack priority value is 1 to 16. The default is 16. It is
important not to confuse the range of this parameter with the permitted
number of switches in a stack. There is no correlation between the two.
The following example of a stack of four switches illustrates how the
management software uses the stack priority value to assign module ID
numbers:
ˆ Switch A is assigned the stack priority value 2.
ˆ Switch B is assigned the stack priority value 5.
ˆ Switches C and D use the default priority value 16.
Switch A, having the lowest priority value, would be assigned module ID
value 1 by the management software and would become the master
switch of the stack. Switch B, having the next lowest priority value, would
be assigned module ID 2. Switches C and D, having identical priority
values, would be assigned module ID numbers based on their MAC
addresses. The switch with the lower MAC address would be assigned
module ID 3 and the last switch would be assigned module ID 4.
Of course, you could assign the stack priority values starting at 1 for the
switches of a stack, as shown here, and so create a direct correlation
between a switch’s stack priority number and its module ID number
assignments:
ˆ Switch A is assigned the priority value 1.
ˆ Switch B is assigned the priority value 2.
ˆ Switches C is assigned the priority value 3.
ˆ Switches D is assigned the priority value 4.
In this scenario, a switch’s priority value and module ID number would
match. But, of course, this approach is really no different than assigning
static module ID numbers to the switches.