Users Guide
2. Connect a 40GbE base port on the second Aggregator to a 40GbE port on the first Aggregator.
The resulting ring topology allows the entire stack to function as a single switch with resilient fail-over
capabilities. If you do not connect the last switch to the first switch (Step 4), the stack operates in a daisy
chain topology with less resiliency. Any failure in a non-edge stack unit causes a split stack.
Accessing the CLI
To configure a stack, you must access the stack master in one of the following ways.
• For remote out-of-band management (OOB), enter the OOB management interface IP address into a
Telnet or secure shell (SSH) client and log in to the switch using the user ID and password to access
the CLI.
• For local management, use the attached console connection to the master switch to log in to the CLI.
Console access to the stack CLI is available on the master only.
• For remote in-band management from a network management station, enter the virtual local area
network (VLAN) IP address of the management port and log in to the switch to access the CLI.
Configuring and Bringing Up a Stack
After you attach the 40G QSFP or direct attach cables in a stack of Aggregators, to bring up the stack,
follow these steps.
NOTE: The procedure uses command examples for the stacking topology shown previously in this
chapter.
1. Set up a connection to the CLI on an Aggregator as described in Accessing the CLI.
2. Log on to the CLI and enter Global Configuration mode.
Login: username
Password: *****
Dell> enable
Dell# configure
3. Configure 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 configuration of each stacked switch is stored in the
running configuration of the stack. The stack-unit ID numbers are retained after future stack
reloads.
Stacking
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