Reference Guide

Removing an Aggregator from a Stack
To remove an Aggregator from a stack, follow the below steps:
1. Disconnect the stacking cables from the unit. The unit can be powered on or o and can be online or oine.
2. Log on to the CLI and enter Global Conguration mode.
Login: username
Password: *****
Dell> enable
Dell# configure
3. Congure the Aggregator to operate in standalone mode.
CONFIGURATION
stack-unit 0 iom-mode standalone
4. Log on to the CLI and reboot each switch, one after another, in as short a time as possible.
EXEC PRIVILEGE
reload
The switch functions in standalone mode but retains the running and startup conguration that was last synchronized by the master
switch while it operated as a stack unit.
Merging Two Operational Stacks
The recommended procedure for merging two operational stacks is as follows:
1. Always power o all units in one stack before connecting to another stack.
2. Add the units as a group by unplugging one stacking cable in the operational stack and physically connecting all unpowered
units.
3. Completely cable the stacking connections, making sure the redundant link is also in place.
Two operational stacks can also be merged by reconnecting stack cables without powering down units in either stack. Connecting a
powered-up standalone unit to an existing stack leads to same behavior as when merging two operational stacks. In such cases,
Manager re-election is done and the Manager with the higher MAC address wins the election. The losing stack manager resets itself
and all its member units. After the reset, all the losing stack members join the winning stack to form a single stack. The winning stack
remains functional through the merge process. If the stack merge is performed in this way, then it is strongly recommended that the
user set the admin management preference of the desired winner stack manager to a higher value than the stack manager that
should lose the election.
NOTE: In case of a stack, when one unit member resets and joins the stack, momentary drops will be observed, which is
recovered after few seconds.
Verifying a Stack Conguration
The following lists the status of a stacked switch according to the color of the System Status light emitting diodes (LEDs) on its
front panel.
• Blue indicates the switch is operating as the stack master or as a standalone unit.
• O indicates the switch is a member or standby unit.
• Amber indicates the switch is booting or a failure condition has occurred.
Using Show Commands
To display information on the stack conguration, use the show commands on the master switch.
• Displays stacking roles (master, standby, and member units) and the stack MAC address.
Stacking
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