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Managing OmniSwitch 6850 Series Stacks Roles Within the Stack

OmniSwitch 6850 Series Hardware Users Guide April 2010 page 4-7

Using Saved Slot Information

The saved slot number is the slot number the switch will assume following a reboot. This information is

stored in a switch’s boot.slot.cfg file; the switch reads its slot number assignment from this file at bootup

and assumes the specified slot number within the stack.

If switches in a stacked configuration have no preconfigured slot assignments, the slot number for each

switch is dynamically assigned by the system software. Slot numbers can also be manually assigned by the

user. For more information on manually assigning slot numbers, refer to “Manual Slot Number Assign-

ment” on page 4-23.

When a stack with preconfigured slot information is booted, it is not the lowest MAC address that deter-

mines the primary management module. Instead, the slot information stored in each switch’s boot.slot.cfg

is read by the system software and used in determining the primary. The switch with the lowest saved slot

number becomes the primary management module.

Note. Although, for ease-of-management purposes, it is recommended that slot numbers are assigned

beginning with slot number 1, it is not a requirement. In other words, a stack of four switches can have

slot assignments 3, 4, 5, and 6. However, it is important that each element in a stack is 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 4-12.

For more information on using saved slot information to determine the primary switch in a stack, refer to

the diagram below:

Primary Management Module Selection Using Saved Slot Information

Slot 6

Slot 5

Slot 4

Primary: Slot 3

Assumes Slot 6

Assumes Slot 5

Assumes Slot 4

Assumes Slot 3

Saved Slot 6

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. When each 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.

Instead of assigning the primary management module

based on the lowest MAC address, 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. In this case, the switch

assigned slot 3 has the lowest slot number in the stack and

becomes the primary management module.

Saved Slot 5

Saved Slot 4

Saved Slot 3

Reload

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 191 192

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Alcatel OS6850-48 Guide de l'utilisateur Page 139

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