Cisco Catalyst 2955C-12 Troubleshooting Manual

Text of Cisco Catalyst 2955C-12 User Guide:

• Cisco Catalyst 2955C-12, CHAPTER 5-1 Catalyst 2955 Hardware Installation Guide 78-14944-03 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 from the browser interface, the command-line interface (CLI), the Cisco Intelligence Engine 2100 (IE2100) Series Configuration Registrar, or a Simple Network Management Protocol (SNMP) workstation. See the

• Cisco Catalyst 2955C-12, Chapter 5 Troubleshooting Understanding POST Results 5-2 Catalyst 2955 Hardware Installation Guide 78-14944-03 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 information 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 d

• 5-3 Catalyst 2955 Hardware Installation Guide 78-14944-03 Chapter 5 Troubleshooting Diagnosing Problems If POST fails on the Catalyst 2955C-12 and 2955S-12: • Uplink port 13 LED blinks amber. • Uplink port 14 LED turns green. If POST fails on the Catalyst 2955T-12: • Uplink port 1 LED blinks amber. • Uplink port 2 LED turns green. Note The uplink port status LEDs pr

• Cisco Catalyst 2955C-12, Chapter 5 Troubleshooting Diagnosing Problems 5-4 Catalyst 2955 Hardware Installation Guide 78-14944-03 Table 5-1 describes how to detect and solve these problems. . Table 5-1 Common Problems and Solutions Symptom Possible Cause Resolution Poor performance or excessive errors. Duplex autonegotiation mismatch. See the switch software configuration guide for information about identifying autonegotiation mismatches. Cabling distance exceeded. • Port statistics show excessive frame check sequence (FCS), late-collision, or alignment errors. • See the switch software configuration guide for information about displaying port sta

• Cisco Catalyst 2955C-12, 5-5 Catalyst 2955 Hardware Installation Guide 78-14944-03 Chapter 5 Troubleshooting Diagnosing Problems No connectivity. Incorrect or bad cable. No link at both ends. • A crossover cable was used when a straight-through was required, or vice-versa. • For the correct pinouts and the proper application of crossover vs. straight-through cables, see the “Cable and Adapter Specifications” section on page B-5. • The cable is wired incorrectly. • Replace it with a tested good cable. • STP checking for possible

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Cisco Catalyst 2955C-12 Product bulletin 23-03-2023 3

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