Reference Guide
Auto Save on Crash or Rollover
Exception information for MASTER or standby units is stored in the
flash:/TRACE_LOG_DIR
directory. This directory
contains files that save trace information when there has been a task crash or timeout.
• On a MASTER unit, you can reach the
TRACE_LOG_DIR
files by FTP or by using the show file command from
the
flash://TRACE_LOG_DIR
directory.
• On a Standby unit, you can reach the
TRACE_LOG_DIR
files only by using the show file command from the
flash://TRACE_LOG_DIR
directory.
NOTE: Non-management member units do not support this functionality.
Last Restart Reason (S4820T)
If an S4820T system restarts for some reason (automatically or manually), the show system command output includes
the reason for the restart.
The following table shows the reasons displayed in the output and their corresponding causes.
Table 77. Line Card Restart Causes and Reasons
Causes Displayed Reasons
Remote power cycle of the chassis push button reset
reload soft reset
reboot after a crash soft reset
Hardware Watchdog Timer
The hardware watchdog command automatically reboots an FTOS switch/router with a single RPM that is
unresponsive.
This is a last resort mechanism intended to prevent a manual power cycle.
Using the Show Hardware Commands
The show hardware command tree is supported on the S4820T only.
The show hardware command tree consists of commands used with the S4820T system. These commands display
information from a hardware sub-component and from hardware-based feature tables.
NOTE: Use the show hardware commands only under the guidance of the Dell Technical Assistance Center.
The following lists the show hardware commands available as of the latest FTOS version on the S4820T.
• View internal interface status of the stack-unit CPU port which connects to the external management interface.
EXEC Privilege mode
show hardware stack-unit {0-11} cpu management statistics
• View driver-level statistics for the data-plane port on the CPU for the specified stack-unit.
EXEC Privilege mode
show hardware stack-unit {0-11} cpu data-plane statistics
This view provides insight into the packet types entering the CPU to see whether CPU-bound traffic is internal (IPC
traffic) or network control traffic, which the CPU must process.
901