Base Unit - Nortel BayStack 450-24T Using Manual

Base Unit

The base unit is the unique stack unit that you configure with the Unit Select
switch on the front panel of the 400-ST1 Cascade Module (see "Unit Select
Switch" on page 1-41).
One unit in the stack must be configured as the base unit; all other units in the
stack must have their Unit Select switch set to Off.
Normally, any single unit in a stack configuration can be assigned as the base unit,
with the following restriction: In a mixed stack configuration that contains one or
more Business Policy Switch 2000 units, a Business Policy Switch 2000 must be
configured as the base unit.
Note: If you do not designate a Business Policy Switch 2000 as the base unit
of a mixed stack configuration, the stack configuration will not operate.
The physical ordering of all of the other units in the stack is determined by the
position of the base unit within the stack. This is important for management
applications that view the physical ordering of the units within the stack.
Some characteristics of the base unit are:
•
Note: You can renumber the units using the Renumber Stack Units screen; see
"Renumber Stack Units" on page 3-107.
309978-D Rev 01
Initial Installation
During the initial installation of the stack, the software automatically
determines the physical order of all units in the stack according to the position
of the base unit within the stack. Thereafter, the individual units maintain their
original unit numbering, even if you change the position of one or more units
in the stack.
For example, when you initially power up the stack, the base unit becomes
unit 1 and the unit that the base unit connects to (via the Cascade A Out cable)
becomes unit 2 (and the next unit is unit 3 and so on), until the maximum
stack configuration (up to 8 units) is reached. If you change the base unit to
another unit in the stack, the new base unit keeps its original unit number in
the stack.
BayStack 450 10/100/1000 Series Switches
1-43