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.
If a standalone switch has no stack groups configured, you can add it to a stack. To add a standalone
switch to a stack, follow these steps.
1. Power on the switch.
2. Attach QSFP or direct attach cables to connect 40GbE 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 a 40GbE port for stacking.
CONFIGURATION mode
stack-unit 0 stack-group group-number
•stack-unit 0 defines the default ID unit-number in the initial configuration of a switch.
•stack-group group-number configures a 40GbE port for stacking. Base-module ports are
stack groups 0 and 1; 40GbE ports on a FlexIO module in slot 0 are stack groups 2 and 3 and in
slot 1 are stack groups 4 and 5.
5. Save the stacking configuration on the 40GbE ports.
EXEC Privilege mode
write memory
6. Reload the switch.
EXEC Privilege mode
reload
The Dell Networking OS 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.
If a standalone switch already has stack groups configured, continue with these steps:
7. Attach QSFP or direct attach cables to connect the 40GbE ports already configured as stack groups
on the switch to one or more switches in the stack.
8. Power on the switch. The Dell Networking OS 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.
Dell Networking OS Behavior: When you add a new switch to a stack:
Stacking 895