Cisco 2950 Hardware Installation Guide - Page 87

Troubleshooting, Understanding POST Results, Diagnosing Problems

Get Cisco 2950 - Catalyst Switch PDF manuals and user guides
UPC - 746320454504
View all Cisco 2950 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 87 highlights

Troubleshooting CH A P T E R 3 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 1-13. You can also get statistics from the device manager, the Network Assistant application, the CLI, the Cisco Intelligence Engine 2100 (IE2100) Series Configuration Registrar, or a 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 3-1 • Diagnosing Problems, page 3-1 Understanding POST Results When the switch powers on, it automatically begins POST, a series of tests that verifies that the switch functions properly. When the switch begins POST, the system LED is off. POST has completed successfully when the SYST and STAT LEDs are green. Note POST failures are usually fatal. Call Cisco Systems if your switch does not pass POST. Diagnosing Problems Common switch problems fall into these categories: • Poor performance • No connectivity • Corrupted software Table 3-1 describes how to detect and solve these problems. OL-6156-01 Catalyst 2950 Switch Hardware Installation Guide 3-1

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
CHAPTER
3-1
Catalyst 2950 Switch Hardware Installation Guide
OL-6156-01
3
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 1-13
.
You can also get statistics from the device manager, the Network Assistant application, the CLI, the
Cisco Intelligence Engine 2100 (IE2100) Series Configuration Registrar, or a 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 3-1
•
Diagnosing Problems, page 3-1
Understanding POST Results
When the switch powers on, it automatically begins POST, a series of tests that verifies that the switch
functions properly. When the switch begins POST, the system LED is off. POST has completed
successfully when the SYST and STAT LEDs are green.
Note
POST failures are usually fatal. Call Cisco Systems if your switch does not pass POST.
Diagnosing Problems
Common switch problems fall into these categories:
•
Poor performance
•
No connectivity
•
Corrupted software
Table 3-1
describes how to detect and solve these problems.