Administrator Guide

Dell# congure
3. Congure the Aggregator to operate in stacking mode.
CONFIGURATION mode
stack-unit 0 iom-mode stack
4. Repeat Steps 1 to 3 on the second Aggregator in the stack.
5. Log on to the CLI and reboot each switch, one after another, in as short a time as possible.
EXEC PRIVILEGE mode
reload
NOTE: If the stacked switches all reboot at approximately the same time, the switch with the highest MAC address is
automatically elected as the master switch. The switch with the next highest MAC address is elected as standby. As each
switch joins the stack, it is assigned the lowest available stack-unit number from 0 to 5. The default conguration of each
stacked switch is stored in the running conguration of the stack. The stack-unit ID numbers are retained after future
stack reloads.
To verify the stack-unit number assigned to each switch in the stack, use the show system brief command.
Adding a Stack Unit
You can add a new unit to an existing stack both when the unit has no stacking ports (stack groups) congured and when the unit
already has stacking ports congured. 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 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 conguration mode.
Login: username
Password: *****
Dell> enable
Dell# congure
4. Congure 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 congurations with the stack.
EXEC Privilege mode
reload
If an Aggregator is already congured to operate in stacking mode, simply attach QSFP or direct attach cables to connect 40GbE
ports on the base module of each stacked Aggregator. The new unit synchronizes its running and startup congurations with the
stack.
Dell Networking OS Behavior: When you add a new Aggregator to a stack:
• If the new unit has been congured with a stack number that is already assigned to a stack member, the stack avoids a
numbering conict by assigning the new switch the rst available stack number.
Stacking
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