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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
After you complete and verify the initial configuration, you can configure your Cisco 1800 series 
fixed-configuration router for specific functions. For advanced configuration procedures, use either 
SDM or the CLI. 
For configuration procedures using SDM, see the Cisco Router and Security Device Manager (SDM) 
Quick Start Guide that shipped with your router.
For configuration procedures using the CLI, see the online document Cisco 1800 Series Integrated 
Services Router (Fixed) Software Configuration Guide. The software configuration guide includes the 
following topics:
 Basic software configuration
 Feature documentation
 Configuration examples
 Troubleshooting and maintenance 
						

							 
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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, page 6-6
 Recovering a Lost Password, page 6-7
 More Troubleshooting Help—Cisco Technical Assistance Center, page 6-7
If you cannot locate the source of the problem, contact a customer service representative for information 
on how to proceed. For technical support information, see the 
“Obtaining Documentation and 
Submitting a Service Request” section of the Preface. Before you call the Cisco Technical Assistance 
Center (TAC), have the following information ready:
 Chassis type and serial number
 Maintenance agreement or warranty information
 Type of software and version number
 Date you received the new chassis
 Brief description of the problem
 Brief explanation of the steps you have taken to isolate the problem
Solving Problems
The key to solving problems is to isolate each problem to a specific subsystem by comparing what the 
router is doing to what it should be doing.
Observing the LED indicators on the front and back panels of the router can help you determine router 
performance and operation. See the following sections:
 Reading System LEDs, page 6-4
 Reading Port and Connection LEDs, page 6-4
When solving problems, consider the following router subsystems: 
						

							 
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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 a power problem. To attempt to isolate the 
problem, check the items identified in the sections that follow.
Normal Indications
With the power switch on, the normal indications are:
 SYS OK LED on green and continuous
 Fans operating
 POE LED on green and continuous if the inline power supply is installed
Fault Indications
Check the following symptoms to locate or eliminate faults in the power and cooling systems:
 With the power switch on, is the SYS OK LED on?
 –If the LED is green and continuous, the router is receiving power and is functional.
 –If the LED is off, check the power source and power cable. 
 With the power switch on and the SYS OK LED on and green, do the fans operate?
 –If no, check the fans.
 –If yes, the power system is functioning.
 Does the router shut down after being on a short time?
 –Check for an environmentally induced shutdown. See the “Environmental Reporting Features” 
section on page 6-2.
 –Check the environmental site requirements in the “General Site Requirements” section on 
page 2-4. 
 –Check for a power supply failure by inspecting the SYS OK LED on the front panel. If the LED 
is green, the power supply is functional.
 Does the router partially boot, but the LEDs do not come on?
 –Check for a power supply failure by inspecting the SYS OK LED on the front panel of the 
router. If the SYS OK LED is blinking or continuous green, the power supply is functional.
 –If the SYS OK LED is not on, see the “Cisco One-Year Limited Hardware Warranty Terms” 
section of the Preface for warranty information, or contact customer service.
Environmental Reporting Features
The following system messages indicate environmental problems: 
						

							 
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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 cooling vents
Take steps to correct the problem. Also see the “Site Environment” section on page 2-4.
 If the fan is not rotating at the desired speed, the following message is displayed on the console 
screen:
%ENVMON-3-FAN_FAILED: Fan not rotating.
Make sure that the fan power cable is properly attached to the mainboard fan power connector. If the 
problem persists, contact your technical support representative.
Troubleshooting Cables and Connections
Network problems can be caused by cables or cable connections, or by external devices such as a 
modem, transceiver, hub, wall jack, WAN interface, or terminal. Check for the following symptoms to 
help isolate the problem:
 The interface ports do not initialize.
 –Check external cable connections.
 The router does not boot properly, or it constantly or intermittently reboots.
 –Check the router chassis or software. See the “Cisco One-Year Limited Hardware Warranty 
Te r m s ” and the “Obtaining Documentation and Submitting a Service Request” sections of the 
Preface for warranty and customer service contact information.
 The router boots, but the console screen is frozen, it displays no output, or it displays garbled output.
 –Check the external console connection.
 –Verify that the parameters for your terminal are set as follows:
(a) The same data rate as configured for the router (9600 baud is the default)
(b) 8 data bits
(c) 1 stop bit
(d) No parity generated or checked
 The router powers on and boots only when a particular cable is disconnected.
 –There may be a problem with the module or cable. See the “Cisco One-Year Limited Hardware 
Warranty Terms” and the “Obtaining Documentation and Submitting a Service Request” 
sections of the Preface for warranty and customer service contact information. 
						

							 
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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 Fixed-Configuration Routers 
LED 
Indicator
StateMeaningPossible Causes and Corrective Actions
SYS OKOffIf the fan is not running—
 No output from the internal 
power supply.
Power is not switched on at the router.
Power is not available from source.
Faulty input power wires or connections.
Failed power supply in the router.
If the fan is running—
 Router fault
Failure in one or more system board components. Contact 
Cisco technical support. See the 
“Obtaining Documentation 
and Submitting a Service Request” section of the Preface.
Solid greenRouter is receiving power, and 
the internal power supply is 
functional.Normal indication. No action is required.
Blinking greenDuring bootup, router is 
booting up normally.Normal indication. No action is required.
After bootup, router is 
operating in ROM monitor 
mode.See the router rebooting and ROM monitor information in 
the
 Cisco IOS Configuration Fundamentals Configuration 
Guide for your Cisco IOS software release.
POE1
1. Inline power is a field-upgradable option on Cisco 1800 series fixed-configuration routers, and is not installed by default.
OffInline power is not installed.No action is required.
Solid greenInline power is functional.Normal indication. No action is required for inline power 
supply.
Solid amberInline power output has failed.Replace inline power supply. See the “Installing the 
Optional Inline Power Supply” section on page 7-5.
CFOffThe CompactFlash memory is 
not being accessed.Normal indication. No action is required. The 
CompactFlash memory card can be removed if the CF LED 
remains off.
Solid green or 
blinkingThe CompactFlash memory is 
being accessed.Normal indication. No action is required.
Caution: Do not remove the CompactFlash memory card 
while it is being accessed.  
						

							 
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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 properly. Check 
configuration and make corrections as necessary.
Solid or blinking 
greenThe Ethernet interface next 
to the LED is receiving 
packets.Normal indication. No action is required.
CD1 (on Cisco 1801, 
Cisco 1802, and 
Cisco
 1803 routers)
OffNo DSL connection is 
established.Normal indication unless a DSL connection is 
required. 
If a DSL connection is expected, check DSL 
connections and make corrections as necessary.
Router is not configured properly. Check 
configuration and make corrections as necessary.
GreenDSL connection is 
established.Normal indication. No action is required.
CD1 (on Cisco 1811 
routers)
OffNo analog modem 
connection is established.Normal indication unless a modem connection is 
required. 
If a modem connection is expected, check modem 
connections and make corrections as necessary.
Router is not configured properly. Check 
configuration and make corrections as necessary.
GreenAnalog modem connection is 
established.Normal indication. No action is required.
LPBK2OffDSL interface is operating in 
normal mode.Normal indication. No action is required.
GreenDSL interface is in loopback 
mode.—
LINK3OffNo ISDN BRI S/T 
connection is established.Normal indication unless an ISDN BRI connection 
is required. 
If an ISDN BRI connection is expected, check 
ISDN BRI S/T connections and make corrections 
as necessary.
Router is not configured properly. Check 
configuration and make corrections as necessary.
GreenAn ISDN BRI S/T D channel 
connection is established.Normal indication. No action is required.
B13Blinking greenActivity on the first B 
channel.Indication is for information only.
B23Blinking greenActivity on the second B 
channel.Indication is for information only. 
						

							 
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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 4-5.)
The terminal should display one of the following prompts:
Router> (indicates the user EXEC command mode)
or
Router# (indicates the privileged EXEC command mode)
The Cisco IOS software checks the system condition once every 30 seconds. If the condition still exists, 
the error message appears again; if the error condition has cleared, a recovery message appears.
Ta b l e 6-3 describes system error and recovery messages and the LED conditions that might accompany 
them.
SPD4GreenConnection running at high 
speed (V.90)Indication is for information only.
OffConnection running at low 
speed (V.32/V.32b/V.34) Indication is for information only.
BUSY4Blinking greenActivity on the analog 
modem connectionIndication is for information only.
1. This LED does not exist on Cisco 1812 routers.
2. This LED exists on Cisco 1801, Cisco 1802, and Cisco 1803 routers only.
3. This LED does not exist on Cisco 1811 routers.
4. This LED exists on Cisco 1811 routers only.
Table 6-2  Port and Connection Indicators on Cisco 1800 Series Fixed-Configuration Routers (continued)
LED Indicator State Meaning Corrective Action 
						

							 
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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 fixed-configuration 
routers, see the 
Password Recovery Procedures document on Cisco.com.
More Troubleshooting Help—Cisco Technical Assistance 
Center
For online troubleshooting help, go to the TAC Case Collection Tool and Troubleshooting Assistant.
You must have an account on Cisco.com. If you do not have an account or have forgotten your username 
or password, click Cancel at the login dialog box and follow the instructions that appear.
Ta b l e 6-3 System Error and Recovery Messages  
LED TypeLED ColorMessage, Meaning, and Recommended Action
——Error:
%ENVMON-3-FAN_FAILED: Fan not rotating.
Explanation:
The fan is not rotating at the desired speed.
Recovery:
Make sure that the fan power cable is properly attached to the system board fan power 
connector. If the problem persists, contact your technical support representative.
——Message:
%ENVMON-1-NO_PROCESS: Failed to create environmental monitor process
Explanation:
The router failed to establish the environmental monitor process. The amount of memory 
available in the router may not be sufficient.
Recommended action:
Increase the amount of memory (RAM) in the router. 
						

							 
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Chapter 6      Troubleshooting
  More Troubleshooting Help—Cisco Technical Assistance Center