Dell PowerEdge FX2/FX2s - Manual (Page 191)

Repeat the above steps on each Aggregator in the stack by entering the stackunit 0 iom-mode
stack command and saving the configuration.
If the stacked switches all reboot at approximately the same time, the Aggregator with the highest MAC
address is automatically elected as the master switch. The Aggregator with the next highest MAC address
is elected as the standby master.
NOTE: You can ensure that a stacked switch becomes the master by rebooting the switch first, and
waiting for it to come up before rebooting the second switch in the stack. It is recommended to
have the boot image for the stack units via boot from flash.
The Status LED on the Aggregator that is elected as the master switch is blue. Perform VLAN and other
software configuration for the stack by connecting to the console port on the master unit. To determine
which switch is the stack master, enter the show system command at the terminal.
To remove an Aggregator from the stack, enter the stack-unit 0 iom-mode standalone command
in Global configuration mode, save the configuration and reload the Aggregator for the change to take
effect.
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.
Login: username
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
Stacking 191