NEC INTELLIGENT L2 SWITCH N8406-022A - Manual (Page 94)

Troubleshooting tools 94
Other network troubleshooting techniques
Other network troubleshooting techniques include the following.
Console and Syslog messages
When a switch experiences a problem, review the console and Syslog messages. The switch displays these
informative messages when state changes and system problems occur. Syslog messages can be viewed by using
the /info/sys/log command. For more information on interpreting syslog messages, see the Command
Reference Guide
.
Ping
To verify station-to-station connectivity across the network, execute the following command:
ping <host name> | <IP address> [ (number of tries) [ msec delay ]]
The IP address is the hostname or IP address of the device. The number of tries (optional) is the number of
attempts (1-32). Msec delay (optional) is the number of milliseconds between attempts.
Trace route
To identify the route used for station-to-station connectivity across the network, execute the following command:
traceroute <host name> | <IP address> [<max-hops> [ msec delay ]]
The IP address is the hostname or IP address of the target station. Max-hops (optional) is the maximum distance to
trace (1-16 devices). Msec delay (optional) is the number of milliseconds to wait for the response.
Statistics and state information
The switch keeps track of a large number of statistics and many of these are error condition counters. The statistics
and state information can be very useful when troubleshooting a LAN or Real Server problem. For more information
about available statistics, see one of the following:
•
"Viewing statistics" chapter of the Browser-based Interface Reference Guide, or
•
"Statistics Menu" chapter of the Command Reference Guide (AOS), or
•
“Statistic Commands” chapter of the Command Reference Guide (ISCLI)
Customer support tools
The following diagnostics tools are not user-configurable.
•
Offline Diagnostics — This tool is used for troubleshooting suspected switch hardware issues. These tests
verify that the selected hardware is performing within expected engineering specifications.
•
Software Panics — If a fatal software condition is found during runtime, the switch will capture the current
hardware and software state information into a panic dump. This dump file can be analyzed post-mortem to
determine the cause of the problem.
•
Stack Trace — If a fatal software condition occurs, the switch dumps stack trace data to the console.