White Papers

Adding a Stack Unit
You can add a new unit to an existing stack both when the unit has no stacking ports (stack groups) configured and when the
unit already has stacking ports configured. If the units to be added to the stack have been previously used, they are assigned
the smallest available unit ID in the stack.
To add a standalone Aggregator to a stack, follow these steps:
1. Power on the switch.
2. Attach SFP+ or direct attach cables to connect 10G ports on the switch to one or more switches in the stack.
3. Log on to the CLI and enter global configuration mode.
Login: username
Password: *****
Dell> enable
Dell# configure
4. Configure the Aggregator to operate in stacking mode.
CONFIGURATION mode
stack-unit 0 iom-mode
stack
5. Reload the switch. Dell Operating System automatically assigns a number to the new unit and adds it as member switch in
the stack. The new unit synchronizes its running and startup configurations with the stack.
EXEC Privilege mode
reload
If an Aggregator is already configured to operate in stacking mode, simply attach SFP+ or direct attach cables to connect 10G
ports on the base module of each stacked Aggregator. The new unit synchronizes its running and startup configurations with
the stack.
Dell Networking OS Behavior: When you add a new Aggregator to a stack:
● If the new unit has been configured with a stack number that is already assigned to a stack member, the stack avoids a
numbering conflict by assigning the new switch the first available stack number.
● If the stack has been provisioned for the stack number that is assigned to the new unit, the pre-configured provisioning
must match the switch type. If there is a conflict between the provisioned switch type and the new unit, a mismatch error
message is displayed.
Resetting a Unit on a Stack
Use the following reset command to reload any of the member units or the standby in a stack. If you try to reset the stack
master, the following error message is displayed:
% Error: Reset of master unit is not allowed.
To reset a unit on a stack, use the following command:
● Reset any designated stack member, except the management unit.
EXEC Privilege mode
reset stack-unitunit-number {hard}
● Hard reset any stack unit including master unit.
EXEC Privilege mode
power-cycle stack-unit [unit-number]
Removing an Aggregator from a Stack
To remove an Aggregator from a stack, follow the below steps:
1. Disconnect the stacking cables from the unit. The unit can be powered on or off and can be online or offline.
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Stacking