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Troubleshooting Cisco 3800 Series Routers

OL-5972-01

Troubleshooting Cisco 3800 Series Routers

Your Cisco 3800 series integrated services router goes through extensive testing and burn-in before

leaving the factory. If you encounter problems, use this document to help isolate problems or to eliminate

the router as the source of the problem.

This document contains the following sections:

• Solving Problems, page 2

• LEDs, page 5

• The show environment Command, page 9

• Error Messages, page 10

• Jumper Settings, page 12

• Recovering a Lost Password, page 13

• More Troubleshooting Help, page 13

Note To troubleshoot network modules, see the Cisco Network Modules Hardware Installation Guide. To

troubleshoot interface cards, see the Cisco Interface Cards Installation Guide. These documents are

available on Cisco.com.

If you cannot find the source of the problem, contact a customer service representative. For information

about obtaining technical support, see the “Obtaining Technical Assistance” section on page 12 of

“Introduction to Cisco 3800 Series Routers Hardware Documentation.” Before you call, have the

following information ready:

• Router type and serial number (for serial number locations, see the “Product Identification” section

on page 5 of “Overview of Cisco 3800 Series Routers”)

• Maintenance agreement or warranty information

• Type of software and version number

• Date you received the router

• Brief description of the problem

• Brief explanation of the steps taken to isolate the problem

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Indice de contenidos

Pagina 1 - OL-5972-01

1Troubleshooting Cisco 3800 Series RoutersOL-5972-01Troubleshooting Cisco 3800 Series RoutersYour Cisco 3800 series integrated services router goes th

Pagina 2 - Solving Problems

Error Messages10Troubleshooting Cisco 3800 Series RoutersOL-5972-01This is an example of the output of the show environment command for a Cisco 3845 r

Pagina 3

Error Messages11Troubleshooting Cisco 3800 Series RoutersOL-5972-01Error Message Fan 1|2|3 had a rotation error reported.ExplanationThe specified fan

Pagina 4

Jumper Settings12Troubleshooting Cisco 3800 Series RoutersOL-5972-01ErrorMessage System detected thermal warning on SYS PS 1|2. System is close to aut

Pagina 5

Recovering a Lost Password13Troubleshooting Cisco 3800 Series RoutersOL-5972-01Note The jumpers are not needed to troubleshoot Cisco IOS problems. If

Pagina 6 - GE 0/0 GE 0/0

More Troubleshooting Help14Troubleshooting Cisco 3800 Series RoutersOL-5972-01

Pagina 7 - GigE 0/0

Solving Problems2Troubleshooting Cisco 3800 Series RoutersOL-5972-01Solving ProblemsThe key to solving problems is to isolate the problem to a specifi

Pagina 8

Solving Problems3Troubleshooting Cisco 3800 Series RoutersOL-5972-01• With the power switch on and the SYS LED steady green, do the fans operate?–If y

Pagina 9 - The show environment Command

Solving Problems4Troubleshooting Cisco 3800 Series RoutersOL-5972-01Troubleshooting Modules, Cables, and ConnectionsNetwork problems can be caused by

Pagina 10 - Error Messages

LEDs5Troubleshooting Cisco 3800 Series RoutersOL-5972-01• Router powers on and boots only when a particular cable is disconnected.–There may be a prob

Pagina 11

LEDs6Troubleshooting Cisco 3800 Series RoutersOL-5972-01Figure 2 Cisco 3825 Rear-Panel LEDsFigure 3 Cisco 3845 Front-Panel LEDs117782ENNMD-ESW-3623x 5

Pagina 12 - Jumper Settings

LEDs7Troubleshooting Cisco 3800 Series RoutersOL-5972-01Figure 4 Cisco 3845 Router Rear-Panel LEDsTable 1 Cisco 3800 Series LED IndicatorsLED 3825 384

Pagina 13 - More Troubleshooting Help

LEDs8Troubleshooting Cisco 3800 Series RoutersOL-5972-01AUX PWR Front — Off IP phone power off or not present, or power-upnot completedSteady green Pr

Pagina 14

The show environment Command9Troubleshooting Cisco 3800 Series RoutersOL-5972-01The show environment CommandThe show environment command can help you