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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
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Chapter 47 Troubleshooting
Using the show platform forward Command
Enabling All-System Diagnostics
Beginning in privileged EXEC mode, enter this command to enable all-system diagnostics:
Switch#
debug all
Caution
Because debugging output takes priority over other network traffic, and because the
debug all
privileged
EXEC command generates more output than any other
debug
command, it can severely diminish switch
performance or even render it unusable. In virtually all cases, it is best to use more specific
debug
commands.
The
no debug all
privileged EXEC command disables all diagnostic output. Using the
no debug all
command is a convenient way to ensure that you have not accidentally left any
debug
commands
enabled.
Redirecting Debug and Error Message Output
By default, the network server sends the output from
debug
commands and system error messages to the
console. If you use this default, you can use a virtual terminal connection to monitor debug output
instead of connecting to the console port or the Ethernet management port.
Possible destinations include the console, virtual terminals, internal buffer, and UNIX hosts running a
syslog server. The syslog format is compatible with 4.3 Berkeley Standard Distribution (BSD) UNIX
and its derivatives.
Note
Be aware that the debugging destination you use affects system overhead. Logging messages to the
console produces very high overhead, whereas logging messages to a virtual terminal produces less
overhead. Logging messages to a syslog server produces even less, and logging to an internal buffer
produces the least overhead of any method.
When stack members generate a system error message, the stack master displays the error message to
all stack members. The syslog resides on the stack master.
Note
Make sure to save the syslog to flash memory so that the syslog is not lost if the stack master fails.
For more information about system message logging, see
Chapter 32, “Configuring System Message
Using the show platform forward Command
The output from the
show platform forward
privileged EXEC command provides some useful
information about the forwarding results if a packet entering an interface is sent through the system.
Depending upon the parameters entered about the packet, the output provides lookup table results and
port maps used to calculate forwarding destinations, bitmaps, and egress information.
