Service Manual

S5000 Debugging and Diagnostics

Topics:

• Offline Diagnostics

• Trace Logs

• Hardware Watchdog Timer

• Using the Show Hardware Commands

• Enabling Environmental Monitoring

• Buffer Tuning

• Troubleshooting Packet Loss

• Enabling Application Core Dumps

• Mini Core Dumps

• Enabling TCP Dumps

Offline Diagnostics

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, Level 0 diagnostics 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, Level 1 diagnostics

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. Level 2 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.

Important Points to Remember

• You can only perform offline diagnostics on an offline standalone unit or offline member unit of a stack

of three or more. You cannot perform diagnostics on the management or standby unit in a stack of two

or more; if you do, a message similar to this displays: Running Diagnostics on master/standby

unit is not allowed on stack.

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