Base Unit; Initial Installation - Nortel BayStack 410 24T Using Manual

Introduction to the BayStack 410-24T Switch
Note: For stacking three or more units (maximum 8 units per stack), order the
optional 1 meter (3.28 ft.) cascade return cable (Order No. AL2018001).

Base Unit

The base unit is the unique stack unit that is configured by the Unit Select switch
on the front panel of the 400-ST1 cascade module. 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 (see "Unit Select Switch" on page 1-28). Any single unit in the
stack can be assigned as the base unit.
Note: Although any single unit in the stack can be assigned as the base unit,
when mixing BayStack models in a single stack, Nortel Networks
recommends that you assign the unit with the highest bandwidth as the base
unit. The additional workload of the base unit is optimized by using the higher
bandwidth model switch.
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 the position of one or more units in the stack is changed (you
can renumber the units using the Renumber Stack Units screen; see "Renumber
Stack Units" on page 3-89).
For example, when the stack is initially powered up, 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 the base unit is changed to another unit
in the stack, the new base unit keeps its original unit number in the stack.
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