Administrator Guide
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 Conguration
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 conguration, use the show commands on the master switch.
• Displays stacking roles (master, standby, and member units) and the stack MAC address.
show system [brief]
• Displays the stack groups allocated on a stacked switch. The range is from 0 to 5.
show system stack-unit unit-number stack-group configured
• Displays the port numbers that correspond to the stack groups on a switch. The valid stack-unit numbers are from 0 to 5.
show system stack-unit unit-number stack-group
• Displays the type of stack topology (ring or daisy chain) with a list of all stacked ports, port status, link speed, and peer stack-unit
connection.
show system stack-ports [status | topology]
Troubleshooting a Switch Stack
To perform troubleshooting operations on a switch stack, use the following commands on the master switch.
1 Displays the status of stacked ports on stack units.
show system stack-ports
2 Displays the master standby unit status, failover conguration, and result of the last master-standby synchronization; allows you to
verify the readiness for a stack failover.
show redundancy
3 Displays input and output ow statistics on a stacked port.
show hardware stack-unit unit-number stack-port port-number
4 Clears statistics on the specied stack unit. The valid stack-unit numbers are from 0 to 5.
clear hardware stack-unit unit-number counters
5 Displays the current operational mode of the Aggregator (standalone or stacking) and the mode in which the Aggregator will operate
at the next reload.
show system stack-unit unit-number iom-mode
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Stacking