Removing And Replacing Stacking Members - Alcatel OS-LS-6224 User Manual

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Configuring the Switch
LEDS. During bootup, the Stacking LEDs indicate the stacking Unit number. When
the device is running, the stack ID selector displays the unit ID number. Pressing a
second time displays the port speed. For example, if the user selected stand-alone
mode, the device boots in the boot-up process as a stand-alone device.
The device units are shipped with a default Unit ID of the stand-alone unit. If the
device is operating as a stand-alone unit, all stacking LEDs are off.
Once the user selects a different Unit ID, it is not erased, and remains valid, even if
the unit is reset.
Unit ID 1 and Unit ID 2 are reserved for Master enabled units. Unit IDs 3 to 8 can be
defined for stack members.
When the Master unit boots or when inserting or removing a stack member, the
Master unit initiates a stacking discovering process.
Note:
If two members are discovered with the same Unit ID the stack continues to
function, however only the unit with the older join time joins the stack. A message
is sent to the user, notifying that a unit failed to join the stack.

Removing and Replacing Stacking Members

Stacking member 1 and Stacking member 2 are Stacking Master enabled units. Unit
1 and Unit 2 are either designated as Master Unit or Secondary Master Unit. The
Stacking Master assignment is performed during the configuration process. One
Master enabled stack member is elected Master, and the other Master enabled
stack member is elected Secondary Master, according to the following decision
process:
• If only one Stacking Master enabled unit is present, it is elected Stacking Master.
• If two Stacking Masters enabled stacking members are present, and one has been
manually configured as the Stacking Master, the manually configured member is
elected Stacking Master.
• If two Master enabled units are present and neither has been manually configured
as the Stacking Master, the one with the longer up-time is elected Stacking Master.
• If the two Master enabled stacking members are the same age, Unit 1 is elected
Stacking Master.
• Two stacking member are considered the same age if they were inserted within the
same ten minute interval.
For example, Stack member 2 is inserted in the first minute of a ten-minute cycle,
and Stack member 1 is inserted in fifth minute of the same cycle, the units are
considered the same age. If there are two Master enabled units that are the same
age, then Unit 1 is elected Stacking Master.
The Stacking Master and the Secondary Master maintain a Warm Standby. The
Warm Standby ensures that the Secondary Master takes over for the Stacking
Master if a failover occurs. This guarantees that the stack continues to operate
normally.
During the Warm Standby, the Master and the Secondary Master are synchronized
with the static configuration only. When the Stacking Master is configured, the
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