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• If you renumber a switch to a number already assigned to another stack unit, the following error
message displays:
Dell#stack-unit 5 renumber 0
% ERROR: stack unit 0 already exists.
Assign a stack-number to a unit.
EXEC Privilege mode
stack-unit unit-number renumber new-number
Provisioning a Stack Unit
You can logically provision a stack-unit number to accept only an MXL 10/40GbE switch.
Provisioning is a type of pre-configuration that is stored on the master switch and applied when a stacked
unit is assigned the unit number.
When you provision a unit number for an MXL 10/40GbE switch:
• The base-module ports on the switch (ports 33 and 37/stack groups 0 and 1) are pre-configured for
40GbE operation.
• The 40GbE ports on FlexIO modules (ports 41 and 45 in slot 0; ports 49 and 53 in slot 1) are pre-
configured for 4x10GbE (quad mode) operation.
Create a virtual stack unit by logically provisioning a switch.
CONFIGURATION mode
stack-unit unit-number provision MXL-10/40GbE
To provision a stack unit, use the stack-unit provision command in Global Configuration mode,
save the provisioning configuration, and reload the stack.
Dell Networking OS Behavior: Stacking configuration is handled as follows on an MXL 10/40GbE switch:
• If a stack unit goes down and is removed from the stack, the logical provisioning configured for the
stack-unit number is saved on the master and standby switches.
• When you add a new unit to the stack and the stack already has an existing member unit with the
same stack-unit number, the new unit is assigned the smallest available unit number (from 0 to 5). A
configuration mismatch between the newly added unit and a logically provisioned unit occurs in the
following situations:
– The logical provisioning for the unit number configures FlexIO module ports for 4x10GbE
operation and the added unit has FlexIO Module ports operating in 40GbE mode.
– The logical provisioning for the unit number and the added unit have different stack groups
configured.
• When a configuration mismatch occurs, the newly added switch enters into a Card-Problem state and
is disabled. A syslog error message generates. To restore a stacked switch in a Card-Problem state,
refer to Failure Scenarios.
• A stack unit can also enter a Card-Problem state after a split-stack reload in which a unit that was
previously neither the master nor standby is elected as the new master and has logical stack-unit
provisioning configured for a stack-unit number that creates a mismatch with the stack-unit
numbering on other units.
Stacking
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