# Renumbering stack units

Use the following procedure to change the unit number of switches in a stack.

## Before you begin

A stack configuration is required to change unit numbers in a stack.

## Procedure

1. From the navigation tree, double-click Edit.
2. In the Edit tree, double-click Chassis.
3. In the Chassis tree, click Switch/Stack.
4. In the work area, click the Stack Numbering tab.
5. To select a switch unit, click a unit row.
6. In the unit row, double-click the cell in the New Unit Number column and select a number from the list.
7. On the toolbar, click Apply.

## Result

A warning message appears indicating that renumbering a unit results in an automatic reset of the stack.

## Variable definitions

The following table describes renumbering a unit in a stack.

Variable | Value
--- | ---
Current Unit Number | Indicates the current unit number of the switch.
Descr | Indicates the port description of the switch.
New Unit Number | Specifies a new unit number for the switch. The stack automatically resets if you change the unit number.