Users Guide

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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 configuration, 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 flow statistics on a stacked port.
show hardware stack-unit unit-number stack-port port-number
4. Clears statistics on the specified 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
Example of the show system stack-ports Command
Dell# show system stack-ports
Topology: Ring
Interface Connection Link Speed Admin Link Trunk
(Gb/s) Status Status Group
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Example of the show redundancy Command
Dell#show redundancy
-- Stack-unit Status --
--------------------------------------------------------
Mgmt ID: 0
Stack-unit ID: 0
Stack-unit Redundancy Role: Primary
Stack-unit State:
Active (Indicates Master Unit.)
Stack-unit SW Version: E8-3-16-46
Link to Peer: Up
-- PEER Stack-unit Status --
--------------------------------------------------------
Stack-unit State: Standby (Indicates Standby Unit.)
Peer stack-unit ID: 1
Stack-unit SW Version: E8-3-16-46
-- Stack-unit Redundancy Configuration --
240
Stacking