Handbook

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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 ]] [-m|-
mgt|-d|-data]
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. By default, the -m
or -mgt option for the management port is used. To use data ports, specify the -d or –data option.
Traceroute
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 N8406-026 10Gb Intelligent L3 Switch Browser-based Interface
Reference Guide,
"Statistics Menu" chapter of the N8406-026 10Gb Intelligent L3 Switch Command Reference Guide
(AOS),
―Statistic Commands‖ chapter of the N8406-026 10Gb Intelligent L3 Switch 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.