Alcatel-Lucent OmniSwitch 6850-48 Hardware User's Manual page 140

Roles Within the Stack
Using Saved Slot Information
If a stack with preassigned slot information for each switch is booted, the switch with the second lowest
slot value is assigned the secondary management role. For example, if a stack of four switches is booted
and the preassigned slot values for each switch are 1, 2, 3, and 4, the switch with the slot value of 2 is
assigned the secondary role. Meanwhile, the switch with the slot value of 1 is assigned the primary
management role (see
For more information on using saved slot information to determine the secondary management module in
a stack, refer to the diagram below:
Saved Slot 1
Saved Slot 3
Saved Slot 4
Saved Slot 2
Reload
Assumes Slot 1
Assumes Slot 3
Assumes Slot 4
Assumes Slot 2
Primary - Slot 1
Slot 3
Slot 4
Secondary - Slot 2
Secondary Management Module Selection Using Saved Slot Information
Reminder. Each element in a stack should always be assigned a unique slot number. Do not assign
duplicate slot numbers to elements in a stack. Otherwise, one or more switches will be forced into
pass-through mode. For more information on pass-through mode, refer to
page 4-10
page 4-7).
1
2
3
4
OmniSwitch 6850 Series Hardware Users Guide
Managing OmniSwitch 6850 Series Stacks
Four OmniSwitch 6850 Series switches are stacked; all switches
are connected via stacking cables. The user configures each
switch to have a unique saved slot number, as shown. When the
saved slot number is configured, the information is automatically
written to the boot.slot.cfg file located in the /flash directory of
each switch.
The user reloads all the elements in the stack either by issuing
the reload all command or by physically powering off and then
powering on all switches.
The system software reads the slot information from each
switch's boot.slot.cfg file during the boot process. The switches
in the stack come up using their assigned slot numbers.
The switch with the lowest assigned slot number automatically
assumes the primary management role. The switch with the
second lowest assigned slot number becomes the secondary
management role, regardless of whether it is attached to stacking
port A of the primary switch. In this case, the switch assigned
slot 2 has the second-lowest slot number in the stack and becomes
the secondary management module.
page 4-12.
September 2009