Alcatel-Lucent OmniSwitch 6350 Hardware User's Manual page 88

Roles Within the Stack
Using Switch Uptime
A user can override both the MAC address and saved slot methods for determining a stack's primary
management module. This is done by controlling the uptime of switches in the stack. If all elements of a
stack are powered off, the user can force a particular switch to become primary by powering on that switch
and waiting a minimum of 15 seconds before powering on any other switches. This can be useful if the
user wants a switch placed in a specific location, e.g., the top-most switch in a stack, to become the
primary.
As with the lowest MAC address method, the primary management module is dynamically assigned slot
number 1 when the stack is booted.
For more information on using saved slot information to determine the primary switch in a stack, refer to
the diagram below:
Off
Off
Off
Powered On
Off
Off
Off
Primary
(Saved Slot 8)
Powered On
Powered On
Powered On
Primary
(Saved Slot 8)
Saved Slot 3
Saved Slot 1
Saved Slot 2
Primary
(Saved Slot 8)
Primary Management Module Selection Using Switch Uptime
page 7-8
1
Four OmniSwitch 6350 switches are stacked and connected
via stacking cables. All switches are currently powered off.
The user powers on a single switch in the stack. In this case,
the bottom-most switch is powered on.
2
The user allows a minimum of 15 seconds to pass.
Because no other switches have joined the stack, the
switch that was powered on considers itself a stand-
alone. The switch assumes a primary role by default—
even if there is a high saved slot number in its
boot.slot.cfg file (e.g., 8).
The user now powers on the remaining switches in the stack
3
in short succession.
In this example, when the remaining switches come online,
4
each has a lower saved slot value than the switch powered on
at step 1. However, the switch powered on at step 1—with its
slot value of 8—retains its primary management role. The
joining switches are essentially ineligible for primary status
because they are considered "late arrivals."
switch to forfeit its role to the switch with the lowest assigned slot
number (in this case, slot number 1), the stack must be rebooted
by the user either by issuing the reload all command or by pow-
ering off and powering on all switches in close succession.
OmniSwitch 6350 Hardware Users Guide
Managing OmniSwitch 6350 Stacks
For the primary
April 2017