Debugging and Diagnostics | 649
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Debugging and Diagnostics
The chapter contains the following sections:
• Offline Diagnostics
• Trace Logs
• Show Hardware Commands
• Environmental Monitoring
• Buffer Tuning
• Troubleshooting Packet Loss
• Application Core Dumps
• Mini Core Dumps
• TCP Dumps
Offline Diagnostics
The offline diagnostics test suite is useful for isolating faults and debugging hardware.The diagnostics tests
are grouped into three levels:
• 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.
• Level 1—A smaller set of diagnostic tests. Level 1 diagnostics perform status, self-test, access, and
read/write tests 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,
EEPROM) wherever possible.
• Level 2—The full set of diagnostic tests. Level 2 diagnostics are used primarily for on-board MAC
level, Physical level, and external 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 virtual local area network (VLAN)
configurations.
Note: Diagnostic is not allowed in Stacking mode, including member stacking. Avoid stacking before
executing the diagnostic tests in the chassis.
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