Troubleshooting the Initial Hardware Configuration

Step 13 Enter the configure memory command to modify or replace passwords in NVRAM.

Router# configure memory

Step 14 Enter the configure terminal command to enter configuration mode:

Router# configure terminal

Step 15 Change only the passwords that are necessary for your configuration. The following example shows how to change all three types of passwords. The first two lines show how to change the enable secret and enable passwords. The last two lines show how to change the console password.

Router (config)# enable secret newpassword1
Router (config)# enable password newpassword2
Router (config)# line con 0
Router (config-line)# password newpassword3

For maximum security, be sure the enable secret and enable passwords are different.

You can remove individual passwords by using the no form of the above commands. For example, entering the no enable secret command will remove the enable secret password.

Step 16 Configure all interfaces to be administratively up. In the following example, the Ethernet 0 port is configured to be administratively up:

Router(config-line)# interface ethernet 0
Router(config)# no shutdown

Enter the equivalent commands for all interfaces that were originally configured.

Step 17 Set the configuration register to the original value you noted in Step 3 or the factory-default value (0x2102). The following example shows how to set the configuration register to the factory-default value:

Router# config-register 0x2102
Router#

Step 18 Press Ctrl-Z to exit configuration mode.

Caution Do not take the next three steps unless you have changed or replaced a password or you might erase your router configuration. If there is no enable secret password (or if you omitted Step 13 through Step 15), proceed to Step 22 and log in.

Step 19 Enter the copy running-config startup-config command to save the new configuration to NVRAM. This command copies the changes you just made to the running configuration to the startup configuration. The following message appears:

Router# copy running-config startup-config
Building configuration
[OK]
Router#

Step 20 Reboot the router:

Router# reload
Proceed with reload? [confirm]

Step 21 Press Return to confirm. When the router reboots it will use the new configuration register value you set in Step 17.

Step 22 Log in to the router with the new or recovered passwords.

Problem Solving

The key to problem solving in this system is to try to isolate the problem to a specific subsystem. By comparing what the system is doing to what it should be doing, the task of isolating a problem is greatly simplified.

When problem solving, consider the following subsystems of the router:

• Power system---Includes the power supply and the wiring.
  

• Cooling system---The blower assembly should go on when you power up the router.
  

• Network processor modules---Problems with these modules can be the most difficult to troubleshoot. You can use the LEDs on the network processor modules to help identify a failure. For complete information on LEDs, refer to the section "Reading Front-Panel LEDs" later in this appendix.
  

• System cables---Includes all of the external cables that connect the router to the network.
  

Troubleshooting the Power and Cooling Systems

Check the following items to help isolate the problem:

• With the power switch on, is the power LED on the front panel on?
  

  • If not, check the AC input, AC source, router circuit breaker, and the power supply cable to make sure they are securely connected.
    

  • If the power LED is still off, the problem might be a power supply failure.
    

• Does the system shut down after being on a short time?
  

  • Check the fan. If the fan is not working, the system will overheat and shut itself down.
    

  • Check the environmental site requirements in the section "General Site Requirements" in the chapter "Preparing to Install Cisco 4000 Series Routers" and ensure that the chassis intake and exhaust vents are clear.
    

Troubleshooting the Network Processor Modules and Cables

Check for the following symptoms to help isolate the problem:

• Network processor module is not recognized by the system when you use the Cisco IOS show version command.
  

  • Check the front panel OK LED for the module. The OK LED should be on.
    

  • Check the LEDs on the network processor module.
    

  • Check to make sure the network processor module's connection to the motherboard is fully seated.
    

  • If the module has one or more daughter boards, check to make sure their connections to the module are correctly seated.
    

  • Check that the correct software version is installed. Refer to the section "Software Compatibility" in the chapter titled "Overview of the Cisco 4000 Series Routers."
    

• Network processor module is recognized when you use the show interface command, but interface port(s) will not initialize.
  

  • Check to make sure the network processor module's connection to the motherboard is fully seated.
    

  • Check the external cables to make sure they are securely connected.
    

  • Use the show interface command to make sure the module is not administratively shut down.
    

• System will not boot properly, or constantly or intermittently reboots.
  

  • Check to make sure the network processor module's connection to the motherboard is fully seated.
    

  • Check that the correct software version is installed. Refer to the section "Software Compatibility" in the chapter titled "Overview of the Cisco 4000 Series Routers."
    

  • Remove and then replace each network processor module one at a time. While each module is removed, reboot the system. If the system boots properly with one of the modules removed, the module might be at fault.
    

• System boots, but the console screen is frozen.
  

  • Check the external console connection to make sure it is secure.
    

  • Verify that you are using the correct console baud rate in the documentation for the terminal.
    

Environmental Reporting Features

If the router is operating at an abnormally high temperature, the following message will be displayed on the console screen:

%SYS-1-OVERTEMP: System detected OVERTEMPERATURE condition. Please 
resolve cooling problem immediately!   

Typical causes of an abnormally high system temperature are as follows:

• Fan failure
  

• Air blockage to cooling vents
  

• Air conditioner failure in the room where the router is located
  

Reading Front-Panel LEDs

The LEDs on the front panel of the router enable you to determine system performance and operation at a glance. This section contains information about the LEDs.

System LED Operation

Figure A-1 shows the network activity, health, run, and power LEDs on the front panel of the router.

Figure A-1 : Cisco 4000 Series---Front Panel LEDs

On the front panel, the three LEDs labeled OK correspond to the three network processor modules, if present, and show their status. The upper LEDs labeled DATA, when blinking, indicate network activity on the interfaces of each module.

When on, the LED labeled POWER indicates that the system card's power is on, and the OK LED above indicates that the processor is working.

Reading Network Processor Module LEDs

The network processor module LEDs are all visible through cutouts in the rear of the chassis.

Ethernet Network Processor Module LEDs

The LEDs on the single-port Ethernet network processor module are labeled as shown in Figure A-2. (Also see Figure 4-4.)

Figure A-2 : Single-Port Ethernet Network Processor Module LEDs

The LEDs on the dual-port Ethernet network processor module are labeled as shown in Figure A-3. (Also see Figure 4-8.)

Figure A-3 : Dual-Port Ethernet Network Processor Module LEDs

The LEDs on the six-port Ethernet network processor module are labeled as shown in Figure A-4. (Also see Figure 4-9.)

Figure A-4 : Six-Port Ethernet Network Processor Module LEDs

When the AUI LED is on, none of the other LEDs on the network processor module will be on. The other LEDs are meaningful only when you use 10BaseT, and you have a link.

The LEDs on Ethernet network processor modules are explained in Table A-1.

Table A-1 : Ethernet Network Processor Module LEDs

LEDs	Indication
TX (transmit)	System is transmitting data
RX (receive)	System is receiving data
AUI (attachment unit interface)	AUI connection is selected
LNK (link)	10BaseT is selected and the link is available
POL (polarity)	Polarity has been switched to correct for defective polarity

Token Ring Network Processor Module LEDs

The two LEDs in the Token Ring network processor module are labeled 16M and IN-RING. (See Figure A-5.)

The 16M LED indicates ring speed. When on, it indicates a ring speed of 16 Mbps; when off, it indicates a ring speed of 4 Mbps.

The in-ring LED, when on, indicates that the network processor module is inserted into the ring. If the LED is off, the network processor module is not inserted into the ring.

Timesaver When the in-ring LED is off, you can unplug the Token Ring cable without causing a problem on the ring.

Figure A-5 : Token Ring Module Network Connector

Four-Port Serial Module LEDs

The four-port serial network processor module has six LEDs per port. (See Figure A-6 and Table A-2.) The functions of the LEDs on the four-port serial module are the same as the functions on the G.703/G.704 module and are different from the functions of the LEDs on the dual-port serial module.

G.703/G.704 Module LEDs

The G.703/G.704 network processor module has six LEDs per port. (See Figure A-7 and Table A-2.) The functions of the LEDs on the G.703/G.704 module are the same as the function on the four-port serial module and are different from the functions of the LEDs on the dual-port serial module.

Figure A-6 : Four-Port Serial Network Processor Module Ports

Figure A-7 : G.703/G.704 Serial Network Processor Module Ports (DB-15)

Table A-2 : Four Port Serial Network Processor Module LEDs

LEDs	LED Colors	Indication
LP	Yellow	Loop
CN	Green	Connect (DSR, DTR, DCD, RTS, CTS)
TD	Green	Transmit Data
TC	Green	Transmit Clock
RD	Green	Receive Data
RC	Green	Receive Clock

TC, RC, TD, and RD are on only when the associated line is changing state; if a line is stuck high or low, the LED is off.

The CN LED on whenever activity is detected on any of the following circuits: data set ready (DSR), data terminal ready (DTR), data carrier detect (DCD), request to send (RTS), and clear to send (CTS).

TD is always associated with the data that is driven by the DTE port, regardless whether the port on the module is a DTE port or a DCE port. This means that TD reflects output data when the port is a DTE port and input data when the port is a DCE port. RD is controlled in a similar way. TC and RC are always associated with the clocks that are driven by the DCE: outputs for a DCE port and inputs for a DTE port.

Dual-Port Serial Network Processor Module LEDs

The dual-port serial network processor module has two columns of LEDs. As viewed from the front (see Figure A-8), the left column is labeled P-0 (for port 0), and the right column is labeled P1 (for port 1). There are ten LEDs per port. Serial network processor modules can be configured for either DTE or DCE.

Figure A-8 : Dual-Port Serial Network Processor Module

When DCE cables are used and when the port is configured with the clockrate command as a DCE port, the DCE LED will go on. (See Figure A-8.) (For more information about the clockrate command, see the Cisco IOS configuration guides and command references.)