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3-3
Catalyst 3750 Switch Hardware Installation Guide
OL-6336-01
Chapter 3 Troubleshooting
Diagnosing Problems
Diagnosing Problems
The LEDs on the front panel provide troubleshooting information about the
switch. They show POST failures, 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 CLI, or from an
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.
You can access the Technical Support Website
(http://www.cisco.com/techsupport) for a list of known hardware problems and
extensive troubleshooting documentation including:
• Field notices
• Security advisories
• Troubleshooting resources
• Factory defaults
• Password recovery
• Recovery from corrupted or missing software
• Switch port problems
• Network interface cards
• Troubleshooting tools
Common switch problems fall into these categories:
• Poor performance
• No connectivity
• Corrupted software
Table 3-1 describes how to detect and resolve these problems.
- Catalyst 3750 Switch 1
- Hardware Installation Guide 1
- CONTENTS 5
- 2 Switch Installation 2-1 6
- 3 Troubleshooting 3-1 8
- IP Settings C-11 9
- Contents 10
- OL-6336-01 10
- Warranty Terms 11
- Duration of Hardware Warranty 12
- Audience 15
- Conventions 16
- Varoitus 17
- Attention 17
- Avvertenza 18
- Advarsel 18
- ¡Advertencia! 19
- Varning! 19
- Related Publications 24
- Obtaining Documentation 25
- Documentation Feedback 26
- Opening a TAC Case 27
- TAC Case Priority Definitions 27
- Product Overview 31
- Features 32
- Front Panel Description 34
- 1 10/100/1000 ports 35
- 10/100 and 10/100/1000 Ports 41
- SFP Module Slots 44
- XENPAK Module Slot 45
- 2 3 4 5 6 7 81 46
- 2 3 4 5 7 81 47
- System LED 48
- Master LED 49
- Port LEDs and Modes 49
- Table 1-4 Port Mode LEDs 50
- Table 1-5 PoE Mode LED 50
- Stack LED 53
- Rear Panel Description 55
- StackWise Ports 57
- Power Connectors 58
- Management Options 59
- Network Configurations 60
- Switch Installation 61
- Preparing for Installation 62
- Installation Guidelines 66
- Verifying Package Contents 68
- Verifying Switch Operation 69
- Powering Off the Switch 70
- Planning the Stack 71
- Powering Considerations 72
- Cabling Considerations 72
- 0.5-meter StackWise Cable 74
- Installing the Switch 76
- 3750G-48TS Switches 78
- 1 Phillips flat-head screws 80
- Mounting the Switch in a Rack 87
- 1 Phillips machine screws 88
- Attaching the Cable Guide 89
- Wall-Mounting 91
- Mounting the Switch on a Wall 92
- Table- or Shelf-Mounting 94
- Installing a XENPAK Module 103
- Removing a XENPAK Module 106
- Connecting to an SFP Module 112
- Statement 1008 113
- Class 1 laser product 113
- 1 LC connector 114
- Connecting to a XENPAK Module 116
- 1 SC connector 118
- Where to Go Next 119
- Troubleshooting 121
- Understanding POST Results 122
- Diagnosing Problems 123
- PoE mode LED blinks amber 127
- Note You can also use the 127
- Technical Specifications 131
- OL-6336-02 132
- Connector Specifications 145
- 10/100 and 10/100 /1000 Ports 146
- SFP Module Ports 147
- XENPAK Module Ports 148
- Console Port 148
- 10/100 ports 149
- Identifying a Crossover Cable 152
- Adapter Pinouts 153
- Signal DB-25 Pin Signal 154
- CLI-Based Setup Program 155
- Accessing the CLI 156
- Taking Out What You Need 158
- 2 Power cord 162
- Connecting to a Power Source 163
- IP Settings 165
- Completing the Setup Program 165
- Numerics 169
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