Cisco 2970 Hardware Installation Guide - Page 89

CH A P T E R 3 Troubleshooting The LEDs on the front panel of the Catalyst 2900 series XL switch 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 1-9. You can also get statistics from the browser interface, from the command-line interface (CLI), or from an SNMP workstation. See the Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide, the Catalyst 2900 Series XL and Catalyst 3500 Series XL Command Reference, or the documentation that came with your SNMP application for details. This chapter describes these topics for troubleshooting problems: • Understanding POST Results • Diagnosing Problems Understanding POST Results Each time the switch is powered on, eight POSTs run automatically to check the most important system components before the switch begins forwarding packets. When the switch begins its POST, the port status LEDs turn amber for 2 seconds, and then they turn green. As each test runs, the port status LEDs turn off, starting with number 1x. The port status LEDs for ports 2x to 8x each turn off in turn as the system completes a test. 78-6461-04 Catalyst 2900 Series XL Hardware Installation Guide 3-1