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If the system is not able to cool down within one minute from the time the shutdown alarm is generated, a second alarm is
triggered and the system shuts down immediately to avoid damaging any component due to overheating:
00:16:08: %SYSTEM:LP %CHMGR-0-TEMP_SHUTDOWN_WARN: Unit 0 a temperature sensor has
exceeded its critical shutdown temperature; Unit will shutdown now. Power cycle the unit
to power it on.
After the system shuts down, it is not possible to operate the console until you reload (power cycle) the system.
NOTE: The Z9500 fan trays and power supplies always blow air from the front (I/O side) to the back (Utility/power
supply and fan side) of the switch. Ensure the air ducts are clean and that all fans (system fans and power-supply fans)
are working correctly. Ensure that there are fan alarms, including fan-tray and power-supply fan alarms. Use the show
alarms command to display alarm information and the show environment command to display the current operational
status of power supplies and fan-tray components.
Troubleshooting Packet Loss
The show hardware stack-unit commands are intended primarily to troubleshoot packet loss.
● show hardware linecard cpu data-plane statistics
● show hardware party-bus port {{0-7} | all} statistics
● show hardware linecard {0-2} drops unit {0-3} port {1-104}
● show hardware linecard {0-2} unit {0-3} {counters | details | port-stats [detail] |
register | execute-shell-cmd | ipmc-replication | table-dump}
● show hardware {layer2| layer3} {e.g. acl |in acl} linecard {0-2} port—set {0-3}
● show hardware layer3 qos linecard {0-2} port—set {0-3}
● show hardware ipv6 {e.g.-acl |in-acl} linecard {0-2} port—set {0-3}
● show hardware system-flow layer2 linecard {0-2} port—set {0-3} [counters]
● show hardware drops interface [range] interface
● show hardware buffer inteface interface{priority-group { id | all } | queue { id| all} ]
buffer-info
● show hardware buffer-stats-snapshot resource interface interface{priority-group { id |
all } | queue { ucast{id | all}{ mcast {id | all} | all}
● clear hardware linecard {0-2} counters
● clear hardware linecard {0-2} unit {0-3} counters
● clear hardware linecard {0-2} cpu data-plane statistics
● clear hardware party-bus port {{0-7} | all} statistics
● clear hardware cp cpu {data-plane | i2c | sata-interface} statistics
● clear hardware rp cpu {data-plane | i2c | sata-interface} statistics
● clear hardware sfm sfm-unit-num counters
● clear hardware cp-switch counters
Displaying Drop Counters
To display drop counters, use the following commands.
● Identify the line card, port pipe, and port that is experiencing internal drops.
show hardware linecard {0–2} drops [unit {0–3} [port {1–104}]]
● Display drop counters.
show hardware linecard {0–2} drops unit {0–3}
● Identify which interface is experiencing internal drops.
show hardware drops interface interface
Dell#show hardware linecard 2 drops
UNIT No: 0
Debugging and Diagnostics
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