Users Guide

Usage Information
The Kernel core dump can be large and may take up to 5 to 30 minutes to upload. Dell Networking OS
does not overwrite application core dumps so you should delete them as necessary to conserve space
on the flash; if the flash is out of memory, the coredump is aborted. On the S-Series, if the FTP server is
not reachable, the application coredump is aborted. Dell Networking OS completes the coredump
process and wait until the upload is complete before rebooting the system.
Offline Diagnostic Commands
The offline diagnostics test suite is useful for isolating faults and debugging hardware. While tests are running, Dell Networking
OS results are saved as a text file (TestReport-SU-X.txt) in the flash directory. This show file command is available only on
master and standby.
Important Points to Remember
• Offline diagnostics can only be run when the unit is offline.
• You can only run offline diagnostics on a unit to which you are connected via the console. In other words, you cannot run
diagnostics on a unit to which you are connected to via a stacking link.
• Diagnostic results are printed to the screen. Dell Networking OS does not write them to memory.
• Diagnostics only test connectivity, not the entire data path.
diag stack-unit
Run offline diagnostics on a stack unit.
Syntax
diag stack-unit number [alllevels | level0 | level1 | level2] verbose testname
Parameters
number
Enter the stack-unit id.
alllevels Enter the keyword alllevels to run the complete set of offline diagnostic tests.
level0 Enter the keyword level0 to run Level 0 diagnostics. 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.
level1 Enter the keyword Level1 to run Level 1 diagnostics. Level 1 diagnostics is a
smaller set of diagnostic tests with support for automatic partitioning. They
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, and CPLD)
wherever possible. There are no tests on 10G links. At this level, stack ports are
shut down automatically.
level2 Enter the keyword level2 to run Level 2 diagnostics. Level 2 diagnostics are a full
set of diagnostic tests with no support for automatic partitioning. 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. To test 10G links,
physically remove the unit from the stack.
Debugging and Diagnostics 520