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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 45 Troubleshooting
Using On-Board Failure Logging
• Power over Ethernet (PoE)—Record of the power consumption of PoE ports on a standalone switch
or a stack member
• Temperature—Temperature of a standalone switch or a switch stack member
• Uptime data—Time when a standalone switch or stack member starts, the reason the switch restarts,
and the length of time the switch has been running since it last restarted
• Voltage—System voltages of a standalone switch or a stack member
You should manually set the system clock or configure it by using Network Time Protocol (NTP).
When the switch is running, you can retrieve the OBFL data by using the show logging onboard
privileged EXEC commands. If the switch fails, contact your Cisco technical support representative to
find out how to retrieve the data.
Note OBFL is supported only on Catalyst 3750-E and 3560-E switches. It is not supported on Catalyst 3750
and 3560 switches.
Configuring OBFL
To enable OBFL, use the hw-module module [switch-number] logging onboard [message level level]
global configuration command. On Catalyst 3750-E switches, the range for switch-number is from 1
to 9. On Catalyst 3560-E switches, the switch number is always 1. Use the message level level parameter
to specify the severity of the hardware-related messages that the switch generates and stores in the flash
memory.
Caution We recommend that you do not disable OBFL and that you do not remove the data stored in the flash
memory.
To disable OBFL, use the no hw-module module [switch-number] logging onboard [message level]
global configuration command.
To clear all the OBFL data in the flash memory except for the uptime and CLI command information,
use the clear logging onboard privileged EXEC command.
In a switch stack, you can enable OBFL on a standalone switch or on all stack members by using the
hw-module module logging onboard [message level level] global configuration command.
In a switch stack, if you enter the hw-module module [switch-number] logging onboard command on
a stack member that does not support OBFL, such as a Catalyst 3750 switch, a message appears with that
information. If a Catalyst 3750 switch is a stack master in a mixed stack of Catalyst 3750-E and 3750
switches and you enter an OBFL command on the Catalyst 3750 switch, the command does not take
effect on the stack master, but the stack master sends the OBFL configuration information to the stack
members.
For more information about the commands in this section, see the command reference for this release.