Troubleshooting Cisco 1800 Series Routers (Modular)
If you encounter problems with your Cisco 1800 series integrated services router (ISR) (modular), the information in this chapter can help you isolate problems in the router or eliminate the router as the source of the problem.
This chapter contains the following sections:
•Problem Solving
•Reading LEDs
•System Messages
•Recovering a Lost Password
•More Troubleshooting Help
Note To troubleshoot interface cards, see Overview of Cisco Interface Cards for Cisco Access Routers.
If you cannot locate the source of the problem, contact a Cisco customer service representative for information on how to proceed. For technical support information, see the "Obtaining Documentation and Submitting a Service Request" section on page 1-15. Before you call, 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 router
•Brief description of the problem
•Brief explanation of the steps you have taken to isolate the problem
Problem Solving
The key to problem solving is to isolate the problem to a specific subsystem by comparing what the router is doing to what it should be doing.
The LEDs on the router aid you in determining router performance and operation. The LEDs are described in the "Reading LEDs" section.
When solving problems, consider the following router subsystems:
•Power and cooling systems—External power source, power cable, router power supply, circuit breaker, and router fan. Also check for inadequate ventilation or air circulation.
•Interface cards—LEDs on the interface cards help identify a failure.
•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. Check the following items to help isolate the problem:
Normal Indications
With the power switch on, the normal indications are:
•SYS PWR LED on green and continuous
•Fan operating
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 PWR 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 PWR LED on and green, does the fan operate?
–If no, check the fan.
–If yes, the power system is functioning.
•With the power switch on and the SYS PWR LED off, does the fan operate?
–If yes, the router is receiving power. The fan is connected directly to the DC outputs of the power supply.
–If no, check the power source and power cable.
•Does the router shut down after being on a short time?
–Check for an environmentally induced shutdown. See the next section, "Environmental Reporting Features."
–Check the environmental site requirements in the "General Site Requirements" section on page 3-3.
–Check for a power supply failure by inspecting the SYS PWR LED on the front panel. If it is green, the power supply is functional.
•Router partially boots, but LEDs do not go on.
–Check for a power supply failure by inspecting the SYS PWR LED on the front panel of the router. If the SYS PWR LED is blinking or continuously green, the power supply is functional.
–If the SYS PWR LED is not on, see "Cisco One-Year Limited Hardware Warranty Terms" section on page 1-14.
Environmental Reporting Features
If the router is operating at an abnormally high temperature, consider the following causes:
•Fan failure
•Air conditioner failure in the room
•Air blockage to cooling vents
Take steps to correct the problem. See the "Site Environment" section on page 3-4.
Troubleshooting Cables, Connections, and Interface Cards
Network problems can be caused by cables, cable connections, or interface cards, 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.
•Card is not recognized by the router.
–Make sure that the card is firmly seated in its slot.
–Check the LEDs on the card. Each card has its own set of LEDs.
–Make sure that you have a version of Cisco IOS software that supports the card.
•Card is recognized, but interface ports do not initialize.
–Make sure that the card is firmly seated in its slot.
–Check external cable connections.
–Make sure that you have a version of Cisco IOS software that supports the card. Check the software requirements for the affected card, which can be found in the configuration note for the card.
•Router does not boot properly, or constantly or intermittently reboots.
–Make sure that the card is firmly seated in its slot.
–Check the router chassis or software.
•Router boots, but the console screen is frozen.
–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
•Router powers on and boots only when a particular card is removed.
–Check the card. See the "Cisco One-Year Limited Hardware Warranty Terms" section on page 1-14 and the "Obtaining Documentation and Submitting a Service Request" section on page 15 of the "Introduction to Cisco 1800 Series Routers (Modular) Hardware Documentation" document for warranty and customer service contact information.
•Router powers on and boots only when a particular cable is disconnected.
–There may be a problem with the card or cable. See the "Cisco One-Year Limited Hardware Warranty Terms" and the "Obtaining Documentation and Submitting a Service Request" sections of the "Introduction to Cisco 1800 Series Routers (Modular) Hardware Documentation" document for warranty and customer service contact information.
Reading LEDs
The LEDs on the router enable you to determine router performance and operation. The System Power (SYS PWR) LED and the System Activity (SYS ACT) LED are on the front panel; all the other LEDs are on the back panel.
Table 8-1 LED Indicators on Cisco 1800 Series Routers
|
|
|
Possible Causes and Corrective Actions
|
SYS PWR |
Off |
No output is coming from the internal power supply. |
Power is not switched on at the router. Power is not available from the source. Faulty input power wires or connections are missing. Failed power supply in the router. To replace the internal power supply, call your Cisco technical support representative. |
Solid green |
Router is receiving power, and the internal power supply is functional. |
Normal indication. No action is required. |
Blinking green |
During 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 1800 series software configuration documentation. |
SYS ACT |
Off |
No packet transfers are occurring. |
Interface card connections are not functional. Router is not configured properly. Check configuration, and make corrections as necessary. |
Blinking |
System is actively transferring packets and monitoring internal activity |
Normal indication. No action is required. |
CF (CompactFlash Busy) |
Off |
The CompactFlash memory card is not being accessed. |
Normal indication. No action is required. It is okay to remove the CompactFlash memory card if the CF LED remains off. |
Blinking green |
The CompactFlash memory card is being accessed. |
Normal indication. No action is required.
Caution
Do not remove the
CompactFlash memory
card while it is being
accessed.
|
FDX |
Off |
Fast Ethernet port next to the LED is operating in half-duplex mode. |
Indication is for information only. |
Solid green |
Fast Ethernet port next to the LED is operating in full-duplex mode. |
Indication is for information only. |
100 |
Off |
Fast Ethernet port next to the LED is operating at 10 Mbps. |
Indication is for information only. |
Solid green |
Fast Ethernet port next to the LED is operating at 100 Mbps. |
Indication is for information only. |
Link |
Off |
Fast Ethernet link is not established at the Ethernet port next to the LED. |
Ethernet is not active or is not connected. Check Ethernet connections. Router is not configured properly. Check configuration, and make corrections as necessary. |
Solid green |
FastEthernet link is established at the Ethernet port next to the LED. |
Normal indication. No action is required. |
AIM (Advanced integration module) |
Off |
No AIM is installed. |
Indication is for information only. |
Solid green |
AIM is recognized by the router and is initialized. |
Normal indication. No action is required. |
System Messages
This section describes system error and recovery messages that may appear when a Cisco 1800 series router is operated. The Cisco IOS software displays system error and recovery messages on an external device console terminal screen. (For more information, see the "Connecting to the Console Port" section on page 6-4.)
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 a condition still exists, the error message is displayed again; if the error condition has cleared, a recovery message is displayed.
Table 8-2 describes some of the most common system error and recovery messages.
Table 8-2 System Messages
|
|
%ENVMON-3-FAN_OK: Fan <fan-number> functional now |
The cooling fan within the chassis is working. |
%ENVMON-3-FAN_FAIL: Fan <fan-number> is malfunctioning |
The cooling fan within the chassis is not working. |
%CFG-3-CARD_NOT_SUPPORTED: Slot <n>. <Card identification from cookie, including at least card type, version, revision, and serial number> |
The card found is not recognized or is not supported in the specified slot. |
%CFG-6-UNKNOWN_AIM: AIM module in AIM slot <n> is not supported by this IOS image. Card info: <all TLV PEP data from cookie> |
This Cisco IOS image does not have the driver code for the AIM discovered in AIM slot. |
Recovering a Lost Password
You can recover a lost enable password, but 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, see the Password Recovery Procedures.
More Troubleshooting Help
For online troubleshooting help, go to the TAC Case Collection Tool and Troubleshooting Assistant.
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