Alcatel OS6855-24 User Guide - Page 158

Secondary Management Module Selection, Using the Stacking Connection to the Primary Switch

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Roles Within the Stack Managing OmniSwitch 6855 Series Stacks Secondary Management Module Selection In order to provide effective management module redundancy, all OmniSwitch stacked configurations dynamically assign a backup, or secondary, management module during the boot process. OmniSwitch 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: A B 1 Four OmniSwitches are stacked and connected via stacking cables, as shown. All switches are currently powered off. None of the switches have preassigned slot numbers-i.e., there are no boot.slot.cfg files present. The user powers on all switches in the stack in close succession and the stack begins the boot process. A B 00:d0:95:b2:3c:8e 00:d0:95:b2:2a:ab 00:d0:95:b2:1c:ff (Primary - Slot 1) 00:d0:95:b2:5b:8d 2 When the elements in the stack come online, the switch with the lowest MAC address is given the primary management role and is dynamically assigned slot number 1. A B Idle Idle Primary Secondary - Slot 2 3 By default, the switch connected to the primary's stacking port A is automatically assigned the secondary management role. The secondary switch is dynamically assigned slot number 2. 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 7-12 and "Slot Numbering" on page 7-20. page 7-10 OmniSwitch 6855 Series Hardware Users Guide September 2011

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Roles Within the Stack
Managing OmniSwitch 6855 Series Stacks
page 7-10
OmniSwitch 6855 Series Hardware Users Guide
September 2011
Secondary Management Module Selection
In order to provide effective management module redundancy, all OmniSwitch stacked configurations
dynamically assign a backup, or secondary, management module during the boot process. OmniSwitch
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 7-12
and
“Slot Numbering” on page 7-20
.
Four OmniSwitches are stacked and connected
via stacking cables, as shown. All switches are
currently powered off. None of the switches
have preassigned slot numbers—i.e., there are
no
boot.slot.cfg
files present. The user powers
on all switches in the stack in close succession
and the stack begins the boot process.
By default, the switch connected to the
primary’s stacking port A is automatically
assigned the secondary management role.
The secondary switch is dynamically
assigned slot number 2.
1
2
3
When the elements in the stack come online,
the switch with the lowest MAC address is
given the primary management role and is
dynamically assigned slot number 1.
A B
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)