Reference Guide

Debugging and Diagnostics | 235

Debugging and Diagnostics

The chapter contains the following major sections:

• Offline Diagnostics

• TRACE logs

• Hardware watchdog timer

• Environmental monitoring

• show hardware commands (S6000)

• Hardware MIB Buffer statistics

• Mini Core Dumps

• Kernel 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 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

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.

Important Points to Remember

• Perform offline diagnostics on one stack member at a time.