Alcatel-Lucent OmniSwitch 6850-48 Hardware User's Manual page 151

Managing OmniSwitch 6850 Series Stacks
If the switch with the lowest MAC address happens to be the bottom-most module in the stack, slot
numbering will not resume from the top of the stack. Instead, the system software will select the second-
ary module using the standard method (i.e., the switch connected to the primary's stacking port A), then
continue to number the stack from the bottom up. This intuitive slot assignment provides the cleanest and
most manageable stack topology. Refer to the diagram below for more information:
Slot 8 - Idle
Slot 7 - Idle
Slot 6 - Idle
Slot 5 - Idle
Slot 4 - Idle
Slot 3 - Idle
Slot 2 - Secondary
Slot 1 - Primary
OmniSwitch 6850 Series Hardware Users Guide
Dynamic Slot Numbering Example 2
September 2009
In this example, the bottom switch is elected
the primary management module for the stack.
(It can be assumed that this switch has the low-
est MAC address in the stack.) This switch is
automatically assigned slot number 1.
The switch immediately above is connected to
the primary switch's stacking port A and, as a
result, is assigned the secondary management
role and given slot number 2.
The system software then sequentially assigns
slot numbers up the stack. In other words, the
switch immediately above slot 2 is assigned
the slot number 3; the switch immediately
above slot 3 is assigned the slot number 4, and
so on. This default procedure ensures the most
ordered and manageable stack topology out of
the box.
Slot Numbering
page 4-21