Administrator Guide

In stack mode, all VLAN membership are removed and the port is assigned only to the default VLAN1. You

must configure additional VLAN membership, as required.

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.

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.

Stacking 856