Allied Telesis AT-SBx81CFC960 - Manual (Page 278)

Chapter 14: VCStack Plus Overview
278 Section III: Building a Stack with VCStack Plus
Chassis ID Numbers
The switches in the stack have to be assigned ID numbers. The valid ID
numbers are 1 and 2. A switch can have only one ID number. The two
switches of the stack must be assigned different ID numbers. The
switches will not form a stack if they have the same ID number. The value
is set at the chassis level. A chassis that has two controller cards has one
ID number.
You use the numbers in the commands in the command line interface to
identify the two units of the stack when you configure the parameters of
the ports and modules of the switches. The chassis ID number is the first
number in the numbering format, shown in Figure 174.
Figure 174. Chassis ID Number in the Numbering Format
You should decide on the ID numbers of the units before starting the
configuration procedure and place labels with the numbers on the units to
make it easier for you to remember their assignments.
In most cases, it does not matter which switch is assigned ID number 1
and which switch is given ID number 2. You just need to be sure to assign
them different numbers during the configuration procedure and to use the
appropriate numbers when configuring the devices with the command line
interface.
There is, however, one situation where the assignments of the ID numbers
can be important. If one of the switches is operating as a stand alone unit
and you want it to maintain its configuration settings when it joins the
stack, you should assign it the ID number 1. That way, the chassis
maintains its configuration when it becomes a part of the stack. For
example, you might install a chassis as a stand-alone unit and later decide
to add a second unit to form a stack. In this case you might want the first
switch to maintain its configuration settings when you add the second unit
and build the stack. By assigning the ID number 1 to the existing switch
and the ID number 2 to the new switch, the existing switch maintains the
configuration settings that it had as a stand-alone unit, after it joins the
stack. (You would also need to assign the existing switch a low priority
number, so that its controller card become the master card of the stack.
For more information, refer to “Priority Numbers” on page 279.)
port1 . 1 .n
Module ID
Port Number
Chassis ID