Cisco Catalyst 2955C-12, Catalyst 2955S-12, Catalyst 2955T-12, Catalyst 2955 Troubleshooting Manual

CHAPTER

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5

Troubleshooting

The front-panel LEDs provide troubleshooting information about the switch.
They show power-on self-test (POST) failures, port-connectivity problems, and
overall switch performance. For a full description of the LEDs, see the “LEDs”

section on page 2-10.

You can also get statistics f rom the bro wser interf ace, the command-line interface
(CLI), the Cisco Intelligence Engine 2100 (IE2100) Series Configuration
Registrar, or a Simple Network Management Protocol (SNMP) workstation. See
the switch software configuration guide, the switch command reference, or the
documentation that came with your IE2100 or SNMP application for details.

This chapter provides these topics for troubleshooting problems:

• Understanding POST Results, page 5-2

• Diagnosing Problems, page 5-3

Chapter 5 Troubleshooting

Understanding POST Results

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Understanding POST Results

After the power is connected, the switch automatically begins POST, a series of
tests that verifies that the switch functions properly.

Note The uplink port status LEDs provide system and status informatio n during POST.

On the Catalyst 2955C-12 and 2955S-12, the uplink ports are labeled 13 and 14.
On the Catalyst 2955T-12, the uplink ports are labeled 1 and 2.

Warning

If you connect or disconnect the console cable with power applied to the
switch or any device on the network, an electrical arc can occur. This could
cause an explosion in hazardous location installations. Be sure that power is
removed or the area is nonhazardous before proceeding.

To verify switch operation, perform POST on the switch in a nonhazardous
location before installation.

Statement 1065

When the Catalyst 2955C-12 and 2955S-12 begin POST:

• Uplink port 13 LED is amber.

• Uplink port 14 LED blinks green.

When the Catalyst 2955T-12 begins POST:

• Uplink port 1 LED is amber.

• Uplink port 2 LED blinks green.

If POST completes successfully on the Catalyst 2955C-12 and 2955S-12:

• Uplink port 13 LED turns green.

• Uplink port 14 LED goes off during the flash file system initialization.

If POST completes successfully on the Catalyst 2955T-12:

• Uplink port 1 LED turns green.

• Uplink port 2 LED goes off during the flash file system initialization.