H3C S5850-54QS, Troubleshooting Manual, Page: 5 / 54

1
Introduction
This document provides information about troubleshooting common software and hardware issues
with S5850 Switch Series.
This document is not restricted to specific software or hardware versions.
General guidelines
IMPORTANT:
To prevent a failure from causing loss of configuration, save the configuration each time you finish
configuring a feature. For configuration recovery, regularly back up the configuration to a remote
server.
When you troubleshoot an issue, follow these general guidelines:
•
To help identify the failure cause, collect system and configuration information, including:

Symptom, time of failure, and configuration.

Network topology information, including the network diagram, port connections, and points
of failure.

Log messages and diagnostic information. For more information about collecting this
information, see "
Collecting log and operating information ."

Physical evidence of failure:
−
Photos of hardware.
−
Status of the LEDs.

Measures you have taken, such as reconfiguration, cable swapping, and reboot.

Output from the commands executed during the troubleshooting process.
•
To ensure safety, wear an ESD-preventive wrist strap when you replace or maintain a hardware
component.
•
If hardware replacement is required, use the release notes to verify the hardware and software
compatibility.
Collecting log and operating information
IMPORTANT:
To facilitate troubleshooting, enable the following features:
•
Information center —To enable the information center, execute the
info-center enable
command.
•
Log file —To enable the log file feature, execute the
info-center logfile enable
command.
•
Saving diagnostic log messages to the diagnostic log file —To enable this feature, execute the
info-center diagnostic-logfile enable
command.
By default, these features are enabled.
Table 1 shows the types of files that the system uses to store operating log and status information.
Common log files are stored in the flash:/logfile directory and diagnostic log files are stored in the
flash:/diagfile directory. You can export these files by using FTP, TFTP, or USB.
In an IRF system, these files are stored on the master device. If master/subordinate switchovers
have occurred, master devices before and after the switchovers have log files. You must collect log