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This chapter describes the debugging and diagnostics tasks you can perform on the switch.
Topics:
•
Offline Diagnostics
•
TRACE Logs
•
Last Restart Reason
•
show hardware Commands
•
Environmental Monitoring
•
Troubleshooting Packet Loss
•
Accessing Application Core Dumps
•
Mini Core Dumps
•
Full Kernel Core Dumps
•
Enabling TCP Dumps
•
Accessing Port Extender Core and Mini Core Dumps
Offline Diagnostics
The offline diagnostics test suite is useful for isolating faults and debugging hardware.
You can run offline diagnostics from the
Important Points to Remember
•
Diagnostics only test connectivity, not the entire data path.
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Diagnostic results are stored on the flash of the switch on which you performed the diagnostics.
The diagnostic tests are grouped into three levels:
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Level 0 — Level 0 diagnostics check for the presence of various components and perform essential path
verifications. In addition, they verify the identification registers of the components on the board.
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Level 1 — A smaller set of diagnostic tests. Level 1 diagnostics perform status/self-test for all the
components on the board and test their registers for appropriate values. In addition, they perform
extensive tests on memory devices (for example, SDRAM, flash, NVRAM, or EEPROM) wherever possible.
•
Level 2 — The full set of diagnostic tests. Level 2 diagnostics are used primarily for on-board Loopback
tests and more extensive component diagnostics. Various components on the board are put into
Loopback mode and test packets are transmitted through those components. These diagnostics also
perform snake tests using VLAN configurations.
Debugging and Diagnostics
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Debugging and Diagnostics
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Troubleshooting
