Troubleshooting
Contents
1. LAN LAN COL Yellow Flashing indicates packet collisions on the local Ethernet LAN BRI 0 BI Green An ISDN connection on B channel 1 Cisco 1604 only If an ISDN device connected to the ISDN S T port is using B channel 1 the LED turns on BRI 0 B2 Green An ISDN connection on B channel 2 Cisco 1604 only If an ISDN device connected to the ISDN S T port is using B channel 2 the LED turns on WIC CD Green Active connection on the WAN interface card serial port WIC ACT Green Data is being sent over the WAN interface card serial port A 12 Cisco 1600 Series Router Hardware Installation Guide Front Panel LEDs Figure A 4 Front Panel LEDs Cisco 1605 yr el SYSTEM ACT ACT WIC PWR TM LI i ETHO ETHI ACT B2 OK CD B1 DO ka v O 2 ise E Table A 3 Front Panel LED Functions Cisco 1605 LED Color Description SYSTEM PWR Green The router is turned on and DC power is being supplied SYSTEM OK Green The router has successfully booted Blinks during the boot cycle ETH ACT Green Data is being sent to or received from the first Ethernet LAN ETH COL Yellow Flashing indicates packet collisions on the first Ethernet LAN ETH1 ACT Green Data is being sent to or received from the second Ethernet LAN ETH1 COL Yellow Flashing indicates packet collisions on the second Eth2. is being supplied SYSTEM OK Green The router has successfully booted Blinks during the boot cycle LAN ACT Green Data is being sent to or received from the local Ethernet LAN LAN COL Yellow Flashing indicates packet collisions on the local Ethernet LAN SER 0 CD Green e Cisco 1601 has an active connection on the serial port e Cisco 1602 has an active connection on the DSU CSU port SER 0 ACT Green e Cisco 1601 serial port is sending or receiving data e Cisco 1602 DSU CSU port is sending or receiving data WIC CD B1 Green e Serial WAN interface card has an active connection on the serial port e ISDN WAN interface card has an ISDN connection on B channel 1 WIC ACT B2 Green e WAN interface card serial port is sending or receiving data WAN interface card ISDN port has a connection on B channel 2 Troubleshooting A 11 Front Panel LEDs Figure A 3 Front Panel LEDs Cisco 1603 and Cisco 1604 yo SYSTEM BI cD LAN PWR Ta COL OK ACT B2 ACT Fai H7294 Table A 2 ra Front Panel LED Functions Cisco 1603 and Cisco 1604 LED Color SYSTEM PWR Green Description The router is turned on and DC power is being supplied SYSTEM OK Green The router has successfully booted Blinks during the boot cycle LAN ACT Green Data is being sent to or received from the local Ethernet
3. APPENDIX A Troubleshooting Use this information to help isolate problems you might encounter with Cisco 1600 series routers or to rule out the router as the source of the problem This appendix contains the following sections Recovering a Lost Enable Password Problem Solving Front Panel LEDs Rear Panel LEDs For information about the Cisco 1600 series ROM monitor refer to the ROM Monitor appendix in the Cisco 1600 Series Software Configuration Guide that came with your router If you cannot locate the source of the problem contact your local reseller for advice 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 chassis Brief description of the problem Brief explanation of the steps you have taken to isolate the problem Troubleshooting A 1 Recovering a Lost Enable Password Recovering a Lost Enable Password This section describes how to recover a lost enable password Note You can recover a lost enable password but not an enable secret password This password is encrypted and must be replaced with a new enable secret password See the Hot Tips section on Cisco Connection Online CCO for information on replacing enable secret passwords Follow these steps to recover a lost enable password Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Connect an A
4. D should be off Is the device connected to the ISDN S T port turned on and correctly configured Possible router hardware problem e Possible problem with device connected to the ISDN S T port Cisco 1604 cannot create an ISDN connection to the remote router when an ISDN device is connected to the ISDN S T port Is the ISDN configured for multipoint service Is the external ISDN device using both B channels e The service provider should configure the line for multipoint service e The service provider should configure the line for multipoint service ISDN device attached to the Cisco 1604 ISDN S T port does not operate correctly Does the device operate correctly if the interface for the Cisco 1604 ISDN U port interface bri0 is shut down Is the Cisco 1604 using both B channels e The service provider should configure the line for multipoint service e The service provider should configure the line for multipoint service Troubleshooting A 9 Troubleshooting ISDN Figure A 1 Troubleshooting ISDN Continued Symptom Checks Causes and Solutions Cannot make an ISDN connection to remote Use show status command device Cisco 1603 Cisco 1604 ISDN WAN interface cards A 10 to check the following Does the current ISDN switch type match actual switch type being used Check the following Is Layer 1 status deactivated If Layer 1 status is active do
5. SCII terminal or a PC running a terminal emulation program to the CONSOLE port on the rear panel of the router Refer to the section Connecting the Console Port in the Installing the Router chapter Configure the terminal to operate at 9600 baud 8 data bits no parity and 1 stop bit Reboot the router At the user EXEC prompt Router gt enter the show version command to display the existing configuration register value Router gt show version Record the setting of the configuration register It is usually 0x2102 or 0x102 Record the break setting Break enabled bit 8 is set to 0 Break disabled default setting bit 8 is set to 1 Note To enable break enter the config register 0x01 EXEC command A 2 Cisco 1600 Series Router Hardware Installation Guide Recovering a Lost Enable Password Step 7 Do one of the following If break is enabled go to Step 8 If break is disabled turn the router OFF wait 5 seconds and turn it ON again Within 60 seconds press the Break key The terminal displays the ROM monitor prompt Go to Step 9 Note Some terminal keyboards have a key labeled Break If your keyboard does not have a Break key refer to the documentation that came with the terminal for instructions on how to send a break Step 8 Step 9 Step 10 Step 11 Step 12 Send a break The terminal displays the following prompt rommon 2 gt Enter confreg 0x142 as follows to
6. ernet LAN WIC CD B1 Green Data is being sent to or received from the WAN interface card port WIC ACT B2 Green Data is being sent to or received from the WAN interface card port Troubleshooting A 13 Rear Panel LEDs Rear Panel LEDs Table A 4 describes the rear panel LEDs For illustrations of these LEDs and the rear panel of the routers refer to Figure 1 2 through Figure 1 5 in the Overview of the Router chapter Table A 4 Rear Panel LED Functions LED Color Description All Models LNK Green Indicates 10BaseT link integrity This LED is not on when next to ETHERNET 10BASET connected to an Ethernet network through the AUI port The Cisco 1605 has two LNK LEDs one for each Ethernet 10BaseT port OK Green The Flash PC card is correctly installed next to FLASH PC CARD slot Cisco 1601 RDY Green A serial port cable connection has been made to a modem or DSU CSU Cisco 1602 LOOPBACK Yellow The DSU CSU is in DSU or CSU loopback mode ALARM Yellow An alarm condition exists on the DSU CSU port CARRIER Green Indicates line synchronization or connection on the DSU CSU port Cisco 1603 OK Green A physical connection has been established with the ISDN next to ISDN BRI S T port central office switch A 14 Cisco 1600 Series Router Hardware Installation Guide Rear Panel LEDs Table A 4 Rear Panel LED Functions Continued LED Color Description Cisco 1604 NTI Green A physical con
7. es Layer 3 status say 2 Active Layer 3 calls If Layer 1 status is active does Layer 3 status say No Active Layer 3 call s If Layer 1 status is active does Layer 3 status say 1 Active Layer 3 call Cisco 1600 Series Router Hardware Installation Guide e Use the isdn switch type command to configure correct switch type e Use the show controller bri0 command to check for the messages CO RUNNING LOOPBACK TESTS or CO TESTING If you receive these messages contact the service provider e Router might have called itself Check destination phone number configured with the dialer map command and the dialer string command e Check destination phone number Check route to the destination e Check router protocol configurations Front Panel LEDs Front Panel LEDs You can use the LEDs on the front panel of the router to determine router performance and operation This section contains information about reading the LEDs and using them to troubleshoot problems Figure A 2 Front Panel LEDs Cisco 1601 and Cisco 1602 ae SYSTEM CD CD B1 LAN PWR Tui SER 0 WIC COL OK ACT ACT ACT B2 ai H6863 TTT Table A 1 Front Panel LED Functions Cisco 1601 and Cisco 1602 LED Color Description SYSTEM PWR_ Green The router is on and DC power
8. ies Router Hardware Installation Guide Problem Solving 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 When problem solving consider the following subsystems of the router WAN interface cards Refer to the LEDs on the cards and the LEDs on the router front panel to help identify a failure For information on the front panel LEDs refer to the Front Panel LEDs section later in this appendix Cables Check all the external cables that connect the router to the network Power system Consider the external power source power cable router power supply and circuit breaker Check for inadequate ventilation or air circulation ISDN configuration Consider ISDN specific hardware and software configurations Cisco 1603 Cisco 1604 and ISDN BRI WAN interface cards only Troubleshooting WAN Interface Cards and Cables Check for the following symptoms to help isolate the problem WAN interface card is not recognized by the router Make sure that the card is correctly installed in the router Refer to the Installing a WAN Interface Card section in the Optional Installations chapter Check the LEDs on the card and on the front panel of the router If you are using a Cisco 1603 or Cisco 1604 check that the router does not have a ISDN S T or an ISDN U card installed WAN in
9. nection has been established from the router internal NTI to the ISDN central office switch OK next to ISDN PHONE port Green The device connected to the router ISDN S T port has established a physical connection with the ISDN central office switch Cisco 1605 LNK Green Indicates 10BaseT link integrity for the Ethernet 1 port next to ETHERNETI 10BASET OK Green The WAN interface card is correctly installed in the router next to WIC slot Troubleshooting A 15 Rear Panel LEDs A 16 Cisco 1600 Series Router Hardware Installation Guide
10. nnected There might be a problem with the WAN interface card or card cables Consult your reseller or local Cisco sales office for warranty information A 6 Cisco 1600 Series Router Hardware Installation Guide Troubleshooting the Power System Troubleshooting the Power System If the router external power supply fails it should be returned to Cisco Check the following items to help isolate the problem Router shuts down after being on a short time Check the environmental site requirements in the Site Requirements section in the Regulatory Compliance and Safety Information for Cisco 1600 and Cisco 1700 Routers document that came with your router Ifthe front panel SYSTEM PWR LED is not on the power supply has failed If the router partially boots but all LEDs remain off the power supply has failed If the router is on but the front panel SYSTEM PWR LED is off the power supply has failed If the front panel SYSTEM PWR LED is on the front panel SYSTEM OK LED is off and the router does not pass console or EIA data the power supply has failed Troubleshooting ISDN This section describes problems related to the ISDN line that might occur Two commands are useful when troubleshooting ISDN For routers with an ISDN S T interface enter the clear interface bri0 command to terminate any active ISDN calls and to reset the ISDN BRI interface Router clear interface bri0 For routers with an ISDN U inte
11. reset the configuration register rommon 2 gt confreg 0x142 Initialize the router by entering the initialize command rommon 2 gt initialize The router cycles its power and the configuration register is set to 0x142 The router uses the boot ROM system image indicated by the system configuration dialog System Configuration Dialog Enter no in response to the prompts until the following message is displayed Press RETURN to get started Press Return The following prompt appears Router gt Troubleshooting A 3 Recovering a Lost Enable Password A 4 Step 13 Step 14 Step 15 Step 16 Step 17 Enter the enable command to enter enable mode Configuration changes can be made only in enable mode Router gt enable The prompt changes to the privileged EXEC prompt Router Enter the show startup config command to display the enable password in the configuration file Router show startup config Enter the configure terminal command to enter configuration mode Router configure terminal Enter the configure register command to reset the configuration register to the original value that you recorded in Step 5 Press Ctrl Z to exit configuration mode Note To return to the configuration being used before recovering the lost enable password do not save the configuration changes before rebooting the router Step 18 Reboot the router and enter the recovered password Cisco 1600 Ser
12. rface enter the clear controller bri0 command to terminate any active ISDN calls to reset the ISDN BRI interface and to reset the ISDN line between the router and the central office switch Router clear controller bri0 Troubleshooting A 7 Troubleshooting ISDN Figure A 1 lists troubleshooting methods for ISDN specific problems that might occur Figure A 1 Troubleshooting ISDN Symptom Checks Causes and Solutions Router is on Is the SYSTEM OK LED e Possible router hardware OK LED next to ISDN S T port is off on problem Cisco 1603 and ISDN S T WAN interface card Are all ISDN cables properly connected Is the NTI LED on Possible ISDN line problem Check with ISDN service provider e Possible NTI problem Router is on e Is the SYSTEM OK LED NTI LED is off on Cisco 1604 and ISDN U WAN interface card Are all ISDN cables properly connected e Is the ISDN line connected to the router ISDN U port Possible router hardware problem e Possible ISDN line problem Check with ISDN service provider e Possible ISDN line problem Check with ISDN service provider A 8 Cisco 1600 Series Router Hardware Installation Guide Troubleshooting ISDN Figure A 1 Troubleshooting ISDN Continued Symptom Checks Causes and Solutions NT1 LED is on OK LED next to ISDN S T port is off Cisco 1604 e If there is no device connected to the ISDN S T port the OK LE
13. terface card is recognized but interface ports do not initialize Make sure that the card is correctly installed in the router Refer to the Installing a WAN Interface Card section in the Optional Installations chapter Check the external cable connections to make sure they are secure Router does not boot properly or constantly or intermittently reboots Make sure that the card is correctly installed in the router Refer to the Installing a WAN Interface Card section in the Optional Installations chapter Troubleshooting A 5 Problem Solving Make sure that the Flash PC card is correctly installed in the router For more information on installing the card refer to the Installing a Flash PC Card section in the Optional Installations chapter Router boots but the console screen is frozen Check the external console connection and make sure it is secure Verify that the parameters for your terminal are set to the following 9600 baud 8 data bits No parity generated or checked 1 stop bit Router powers on and boots only when a particular WAN interface card is removed from the router Replace the card Consult your reseller or local Cisco sales office for warranty information If you are using a Cisco 1603 or Cisco 1604 check that the router does not have a ISDN S T or an ISDN U card installed Router powers on and boots only when a particular cable is disco
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