Roles Within the Stack Managing OmniSwitch 6450 Stacks
page 6-10 OmniSwitch 6450 Hardware Users Guide July 2012
Secondary Management Module Selection
In order to provide effective management module redundancy, all OmniSwitch 6450 stacked configura-
tions dynamically assign a backup, or secondary, management module during the boot process.
OmniSwitch 6450 stacks use two different methods for selecting the secondary switch. These methods are:
• Stacking connection to the primary switch
• Saved slot number
Using the Stacking Connection to the Primary Switch
By default, the switch that is connected to the primary switch’s stacking port A is automatically assigned
the secondary management role. This applies to stacks on which there is no preassigned slot information—
i.e., there is no boot.slot.cfg file present in any switch.
For more information on using the stacking connection to the primary switch to determine the secondary
management module, refer to the diagram below:
Secondary Management Module Selection Using the Stacking Connection to the Primary Switch
Note. For information on dynamic slot numbering for idle elements within the stack, refer to “Idle Module
Role” on page 6-12 and “Slot Numbering” on page 6-20.
Four OmniSwitch 6450 switches are
stacked and connected via stacking
cables, as shown. All switches are cur-
rently powered off. None of the
switches have preassigned slot num-
bers—i.e., there are no boot.slot.cfg
files present. The user powers on all
By default, the switch connected to
the primary’s stacking port A is
automatically assigned the second-
ary management role. The second-
1
2
3
When the elements in the stack come
online, the switch with the lowest
MAC address is given the primary
A B
A B
00:d0:95:b2:3c:8e
00:d0:95:b2:2a:ab
00:d0:95:b2:1c:ff
00:d0:95:b2:5b:8d
Idle
Idle
Primary
Secondary - Slot 2
(Primary - Slot 1)
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