Managing OmniSwitch 6450 Stacks Slot Numbering
OmniSwitch 6450 Hardware Users Guide July 2012 page 6-21
Dynamic Slot Number Assignment
Dynamic slot number assignment occurs when there are no boot.slot.cfg files present in the switches’
/flash directories. This is the case for new, “out of the box,” switches that have not been previously
booted.
When a brand new stack (or stack with no boot.slot.cfg files) is booted, the system software automati-
cally detects the module with the lowest MAC address. This module is assigned the primary management
role (see page 6-4) and, by default, is given the slot number 1. The module connected to the primary’s
stacking port A is automatically assigned the secondary management role and given the slot number 2.
As the other modules in the stack become operational, they are assigned idle roles and are automatically
assigned unique slot numbers. The slot numbering for idle modules is determined by each module’s physi-
cal location in the stack. Refer to the diagrams below for more information on dynamic slot numbering.
Note. As the slot numbers are dynamically assigned, boot.slot.cfg files are auto-generated in the /flash
directory of each switch. When modules are subsequently booted, each switch reads its slot number
assignment from this file and comes up accordingly.
Dynamic Slot Numbering Example 1
Slot 1 - Primary
Slot 2 - Secondary
Slot 3 - Idle
In this example, the fourth switch from the
top is elected the primary management mod-
ule for the stack. (It can be assumed that this
switch has the
lowest MAC address in the stack.) This
switch is automatically assigned slot number
1.
The switch immediately below is connected
to the primary switch’s stacking port A and,
as a result, is assigned the secondary man-
agement role and given slot number 2.
The system software allows the switch
immediately below slot 2 to have the
next slot number preference. It is
Slot 4 - Idle
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