Installation guide

CHAPTER
3-1
Catalyst 3750 Switch Hardware Installation Guide
OL-6336-01
3
Troubleshooting
The LEDs on the front panel provide troubleshooting information about the
switch. They show failures in the power-on self-test (POST), port-connectivity
problems, and overall switch performance. For a full description of the switch
LEDs, see the “LEDs” section on page 1-15.
You can also get statistics from the browser interface, from the command-line
interface (CLI), or from a Simple Network Management Protocol (SNMP)
workstation. See the software configuration guide, the switch command reference
guide on Cisco.com, or the documentation that came with your SNMP application
for details.
This chapter describes these topics for troubleshooting problems:
• Understanding POST Results, page 3-1
• Replacing a Failed Stack Member, page 3-8
Understanding POST Results
As the switch powers on, it begins the power-on self-test (POST), a series of tests
that runs automatically to ensure that the switch functions properly. POST lasts
approximately 1 minute.
When the switch begins POST, the System, the RPS, the Master, the Status, the
Duplex, the Speed, and the Stack LEDs turn green. (On the Power over Ethernet
[PoE] Catalyst 3750 switches, the PoE LED also turns green as POST begins.)
The System LED flashes green, and the other LEDs remain continuous green.