User Manual

12 Ten GigabitEthernet/IEEE 802.3 interface(s)
Dell#
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, 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, access, and
read-write tests 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 MAC
level, Physical level, 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.
Important Points to Remember
• You can only perform offline diagnostics on an offline standalone unit.
• Diagnostics only test connectivity, not the entire data path.
• Diagnostic results are stored on the flash of the unit on which you performed the diagnostics.
• When offline diagnostics are complete, the unit or stack member reboots automatically.
Running Offline Diagnostics
To run offline diagnostics, use the following commands.
For more information, refer to the examples following the steps.
1. Place the unit in the offline state.
EXEC Privilege mode
offline stack-unit
You cannot enter this command on a MASTER or Standby stack unit.
NOTE: The system reboots when the offline diagnostics complete. This is an automatic
process. The following warning message appears when you implement the offline stack-
unit command:
Warning - offline of unit will bring down all the protocols and
the unit will be operationally down, except for running Diagnostics.
Please make sure that stacking/fanout not configured for Diagnostics
execution.
Also reboot/online command is necessary for normal operation after the
offline command is issued.
Proceed with Offline [confirm yes/no]:
Dell#offline stack-unit 0
Warning - offline of unit will bring down all the protocols and
the unit will be operationally down, except for running Diagnostics.
270
Debugging and Diagnostics