Deployment Guide

Diagnostics execution. Also reboot/online command is necessary for normal operation
after the offline command is issued. Proceed with Offline [confirm yes/no]:yes
After the system goes offline, you must reload or run the online stack-unit stack-unit-number command for the normal
operation.
2. Confirm the offline status.
EXEC Privilege mode
show system brief
3. Start diagnostics on the unit.
diag stack-unit stack-unit-number
When the tests are complete, the system displays the following message and automatically reboots the unit.
Diagnostic results are printed to a file in the flash using the filename format TestReport-SU-<stack-unit-id>.txt.
Log messages differ somewhat when diagnostics are done on a standalone unit and on a stack member.
4. View the results of the diagnostic tests.
EXEC Privilege mode
show file flash://TestReport-SU-stack-unit-id.txt
The following example shows the offline stack-unit stack-unit-number command.
DellEMC#offline stack-unit 1
Warning - Taking unit offline for running diagnostics
will make it operationally down, causing traffic disruption through the unit.
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]:yes
Trace Logs
In addition to the syslog buffer, Dell EMC Networking OS buffers trace messages which are continuously written by various Dell
EMC Networking OS software tasks to report hardware and software events and status information.
Each trace message provides the date, time, and name of the Dell EMC Networking OS process. All messages are stored in a
ring buffer. You can save the messages to a file either manually or automatically after failover.
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.
Hardware Watchdog Timer
The hardware watchdog command automatically reboots an Dell EMC Networking OS switch/router with a single RPM that
is unresponsive.
This is a last resort mechanism intended to prevent a manual power cycle.
Enabling Environmental Monitoring
The device components use environmental monitoring hardware to detect transmit power readings, receive power readings, and
temperature updates.
To receive periodic power updates, you must enable the following command.
Debugging and Diagnostics
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