Cisco 1812j Manual

 
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Chapter 5      Power-Up and Initial Configuration Procedures
  Configuring the Router
After you complete and verify the initial configuration, you can configure your Cisco 1800 series 
fixed-configuration router for specific functions. See the 
“Completing the Configuration” section on 
page 5-9 for information about locating documentation for advanced configuration procedures.
Completing the Configuration...

 
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Chapter 5      Power-Up and Initial Configuration Procedures
  Configuring the Router 

CH A P T E R
 
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6
Troubleshooting
If you encounter problems with your Cisco 1800 series fixed-configuration router, use the information 
in this chapter to isolate problems in the router or to eliminate the router as the source of the problem.
This document includes the following sections: 
 Solving Problems, page 6-1
 Reading System LEDs, page 6-4
 Reading Port and Connection LEDs, page 6-4
 System Messages,...

 
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Chapter 6      Troubleshooting
  Solving Problems
 Power and cooling systems—External power source, power cable, router power supply and circuit 
breaker, and router blower and fan. Also consider inadequate ventilation or air circulation. 
 Cables—External cables that connect the router to the network. 
Troubleshooting the Power and Cooling Systems
Both the system LED and the fans can help you troubleshoot...

 
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Chapter 6      Troubleshooting
  Solving Problems
 If the router is operating at an abnormally high temperature, the following message is displayed on 
the console screen:
%SYS-1-OVERTEMP: System detected OVERTEMPERATURE condition. Please resolve cooling 
problem immediately!
Some causes of abnormally high router temperature are as follows:
 –Fan failure
 –Air conditioner failure in the room
 –Blocked...

 
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Chapter 6      Troubleshooting
  Reading System LEDs
Reading System LEDs
Check the system LEDs on the front panel of the router for information about the power, data packet 
activity, and CompactFlash activity. See 
Ta b l e 6-1.
Reading Port and Connection LEDs
Check the port and connection LEDs to determine router performance and operation. See Ta b l e 6-2.
Ta b l e 6-1  System LEDs on Cisco 1800 Series...

 
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Chapter 6      Troubleshooting
  Reading Port and Connection LEDs
Ta b l e 6-2  Port and Connection Indicators on Cisco 1800 Series Fixed-Configuration Routers 
LED IndicatorStateMeaningCorrective Action
FExOffThe Ethernet interface next 
to the LED is not receiving 
packets.Ethernet is not active or is not connected. Check 
Ethernet connections and make corrections as 
necessary.
Router is not configured...

 
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Chapter 6      Troubleshooting
  System Messages
System Messages
This section describes system and recovery messages that may appear during operation of a Cisco 1800 
series fixed-configuration router. Cisco IOS software displays system error and recovery messages on 
an external device console terminal screen. (For more information, see the 
“Connecting to a Console 
Terminal or Modem” section on page...

 
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Chapter 6      Troubleshooting
  Recovering a Lost Password
Recovering a Lost Password
You can recover a lost enable password. However, an enable secret password is encrypted and is not 
recoverable. If you lose an enable secret password that is configured on your router, you can replace it 
with a new enable secret password.
For password recovery and replacement procedures for the Cisco 1800 series...

 
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Chapter 6      Troubleshooting
  More Troubleshooting Help—Cisco Technical Assistance Center