Nortel 2000, Using Manual

Page: 96 / 405

96 Chapter 2 Network configuration
208700-B
Base unit
The base unit is the unique stack unit that you configure with the Unit Select
switch on the front panel of the BayStack 400-ST1 Cascade Module. One
Business Policy Switch 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 (see
“Unit Select
switch ”). You can assign any single Business Policy Switch as the base unit. If
you are configuring a mixed stack, refer to Appendixes for base unit instructions.
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 described in the following sections.
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.
(Refer to Chapter 3 for information on renumbering the units using the console
interface (CI) menus and to Using Web-based Management for the Business
Policy Switch 2000 Software Version 1.2 for renumbering the units using the
Web-based management system).
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.
Note:
For stacking three or more units (maximum 8 units per stack),
order the optional 1 meter (39.27 inch) cascade max-return cable (order
number AL2018001).