Reference Guide

Add Units to an Existing S-Series Stack
You can add units to an existing stack in one of three ways.
• By manually assigning a new unconfigured unit a position in an existing stack.
• By adding a configured unit to an existing stack.
• By merging two stacks.
If you are adding units to an existing stack, you can either:
• allow Dell Networking OS to automatically assign the new unit a position in the stack, or
• manually determine each units position in the stack by configuring each unit to correspond with the
stack before connecting it.
• If you add a unit that has a stack number that conflicts with the stack, the stack assigns the first
available stack number.
• If the stack has a provision for the stack-number that will be assigned to the new unit, the provision
must match the unit type, or Dell Networking OS generates a type mismatch error.
After the new unit loads, it synchronizes its running and startup configurations with the stack.
Manually Assigning a New Unit to an Existing Stack
To manually assign a new unit a position in an existing stack, use the following steps.
NOTE: For an S50 system, install the stacking modules in the new unit while the unit is not powered.
1. On the stack, determine the next available stack-unit number, and the management priority of the
management unit.
EXEC Privilege mode
show system brief or show system stack-unit
2. On the new unit, number it the next available stack-unit number.
EXEC Privilege mode
3. (OPTIONAL) On the new unit, assign a management priority based on whether you want the new
unit to be the stack manager.
CONFIGURATION mode
4. Assign a stack group to each unit.
CONFIGURATION mode
stack-unit-id stack-group-id
5. Connect the new unit to the stack using stacking cables.
Adding a Configured Unit to an Existing Stack
To add a configured unit to an existing stack, use the following commands.
If a stack unit goes down and is removed from the stack, the logical provisioning configured for that
stack-unit number is saved on the master and standby units. When a new unit is added to the stack, if a
stack group configuration conflict occurs between the new unit and the provisioned stack unit, the
configuration of the new unit takes precedence.
1. Add the configured unit to the top or bottom of the stack.
2. Power on the switch.
3. Attach cables to connect ports on the added switch to one or more existing switches in the stack.
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Stacking