Brocade FastIron Ethernet Switch Stacking Configuration Guide - Manual (Page 84)

order for the configuration to stay on the active controller (to make it a static configuration), you
must do a write memory on the active controller.
• If the active controller has configuration information for a new unit, and it matches the base
module (module 1) of the new unit, no action is necessary. If configuration information for non-
base modules on the new unit does not match the information on the active controller, the active
controller learns the configuration for the new unit module types and merges it with the
information it has for the base module. This merged configuration remains static and will stay on
the active controller even if the new unit leaves the stack.
• If the active controller has configuration information for the new unit, but it does not match the
base module of the new unit, a configuration mismatch can occur where the configuration related
to this unit is removed even after the mismatch is resolved. Refer to “Recovering from a stack unit
mismatch,” for more information.
Removing a unit from a traditional stack
To remove a unit from the stack, disconnect the cables from the stacking ports. This can be done
whether the units are powered-on or powered-off. When you remove a unit that is powered-on, it is still
in stacking enabled mode. To remove the stacking files, enter the stack unconfigure me or stack
unconfigure clean command. When the unit reboots, it will operate as a standalone unit.
When a unit is removed from a stack, the active controller deletes this unit configuration if it is
dynamically learned. Refer to “Brocade traditional stacking terminology” for definitions of static and
dynamic configurations.
Replacing traditional stack units (unit replacement)
Older stack units can be replaced using the following methods based on whether there are single or
multiple units to be replaced.
Replacing a old traditional stack unit with a clean traditional stack unit
If the stack unit ID numbering is sequential, you can easily swap a failed unit with an identical clean
unit using this procedure.
1. Remove the old unit from the stack.
2. Make sure that the hardware (module) configuration of the replacement unit is identical to that of
the failed unit.
3. Connect the new unit to the stack using the same stacking ports used by the old unit.
4. If the configuration of the replacement unit matches the configuration on the active controller, the
active controller resets the new unit, which automatically becomes active in the stack, and the
stack retains its original topology.
Replacing multiple old traditional stack units with multiple clean traditional stack units
If you are replacing multiple old units with clean units, the active controller replaces the unit with the
lowest ID first. For example, if you remove units 5 and 6 (which are FCX624P-STK devices), the active
controller assigns ID 5 to the first new FCX624P-STK device you install. If you wanted this particular
unit to replace unit 6, instead of unit 5, you must use secure-setup.
You must use secure-setup If the replacement is not a clean unit, the connection is not sequential, or
you do not want the active controller to trigger an automatic replacement. Use the following steps.
Removing a unit from a traditional stack
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