Cisco Systems 3560 Using the show platform forward Command

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Catalyst 3560 Switch Software Configuration Guide

OL-8553-06

Chapter 47 Troubleshooting

Using the show platform forward Command

To display the state of each debugging option, enter this command in privileged EXEC mode:

Switch# show debugging

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.

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 Chapter 30, “Configuring System Message

Logging.”

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.

Note For more syntax and usage information for the show platform fo rward command, see the switch

command reference for this release.