Redirecting Debug And Error Message Output - Cisco IE-4000 Software Configuration Manual

Troubleshooting
Monitoring Information
Switch# show debugging
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.
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.
For more information about system message logging, see
Monitoring Information
Physical Path
You can display the physical path that a packet takes from a source device to a destination device by using one of these
privileged EXEC commands:

tracetroute mac [interface interface-id] {source-mac-address} [interface interface-id] {destination-mac-address}
[vlan vlan-id] [detail]

tracetroute mac ip {source-ip-address | source-hostname}{destination-ip-address | destination-hostname}
[detail]
SFP Module Status
You can check the physical or operational status of an SFP module by using the show interfaces transceiver privileged
EXEC command. This command shows the operational status, such as the temperature and the current for an SFP
module on a specific interface and the alarm status. You can also use the command to check the speed and the duplex
settings on an SFP module.
Configuring System Message Logging, page 515
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