Reference Guide

Adding a Stack Unit
You can add a new unit to an existing stack both when the unit has no stacking ports (stack groups) congured and when the unit
already has stacking ports congured. 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 conguration mode.
Login: username
Password: *****
Dell> enable
Dell# congure
4. Congure 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 congurations with the stack.
EXEC Privilege mode
reload
If an Aggregator is already congured 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 congurations with the stack.
Dell Networking OS Behavior: When you add a new Aggregator to a stack:
• If the new unit has been congured with a stack number that is already assigned to a stack member, the stack avoids a
numbering conict by assigning the new switch the rst available stack number.
• If the stack has been provisioned for the stack number that is assigned to the new unit, the pre-congured provisioning must
match the switch type. If there is a conict 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]
180
Stacking