Cisco Router 860, 880 Series User Manual
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19-5 Book Title OL-xxxxx-xx Chapter 19 Troubleshooting ATM Troubleshooting Commands show atm interface Command To display ATM-specific information about an ATM interface, use the show atm interface atm 0 command from privileged EXEC mode, as shown in Example 19-3. Example 19-3 Viewing Information About an ATM Interface Router# show atm interface atm 0Interface ATM0: AAL enabled: AAL5 , Maximum VCs:11, Current VCCs:0 Maximum Transmit Channels:0 Max. Datagram Size:1528 PLIM Type:INVALID - 640Kbps, Framing is INVALID,DS3 lbo:short, TX clocking:LINE 0 input, 0 output, 0 IN fast, 0 OUT fast Avail bw = 640 Config. is ACTIVE Ta b l e 19-2 describes some of the fields shown in the command output. Fast Ethernet n is administratively down, line protocol is downThe specified Fast Ethernet interface has been disabled with the shutdown command, and the interface is disconnected. For Dialer Interfaces Dialer n is up, line protocol is upThe specified dialer interface is up and operating correctly. Dialer n is down, line protocol is down This is a standard message and may not indicate anything is actually wrong with the configuration. or If you are having problems with the specified dialer interface, this can mean it is not operating, possibly because the interface has been brought down with the shutdown command, or the ADSL cable is disconnected. Table 19-1 show interface Command Output Description (continued) Output Cause Ta b l e 19-2 show atm interface Command Output Description FieldDescription AT M i n t e r f a c eInterface number. Always 0 for the Cisco 860 and Cisco 880 series access routers. AAL enabledType of AAL enabled. The Cisco 860 and Cisco 880 series access routers support AAL5. Maximum VCsMaximum number of virtual connections this interface supports. Current VCCsNumber of active virtual channel connections (VCCs).
19-6 Book Title OL-xxxxx-xx Chapter 19 Troubleshooting ATM Troubleshooting Commands debug atm Commands Use the debug commands to troubleshoot configuration problems that you might be having on your network. The debug commands provide extensive, informative displays to help you interpret any possible problems. Guidelines for Using Debug Commands Read the following guidelines before using debug commands to ensure appropriate results. All debug commands are entered in privileged EXEC mode. To view debugging messages on a console, enter the logging console debug command. Most debug commands take no arguments. To disable debugging, enter the undebug all command. To u s e debug commands during a Telnet session on your router, enter the terminal monitor command. CautionDebugging is assigned a high priority in your router CPU process, and it can render your router unusable. For this reason, use debug commands only to troubleshoot specific problems. The best time to use debug commands is during periods of low network traffic so that other activity on the network is not adversely affected. You can find additional information and documentation about the debug commands in the Cisco IOS Debug Command Reference. debug atm errors Command Use the debug atm errors command to display ATM errors. The no form of this command disables debugging output. Example 19-4 shows a sample output. Example 19-4 Viewing ATM Errors Router# debug atm errorsATM errors debugging is on Router# 01:32:02:ATM(ATM0.2):VC(3) Bad SAP received 450001:32:04:ATM(ATM0.2):VC(3) Bad SAP received 4500 01:32:06:ATM(ATM0.2):VC(3) Bad SAP received 4500 Maximum Transmit Channels Maximum number of transmit channels. Max Datagram SizeConfigured maximum number of bytes in the largest datagram. PLIM TypePhysical layer interface module (PLIM) type. Table 19-2 show atm interface Command Output Description (continued) Field Description
19-7 Book Title OL-xxxxx-xx Chapter 19 Troubleshooting ATM Troubleshooting Commands 01:32:08:ATM(ATM0.2):VC(3) Bad SAP received 450001:32:10:ATM(ATM0.2):VC(3) Bad SAP received 4500 debug atm events Command Use the debug atm events command to display events that occur on the ATM interface processor and to diagnose problems in an ATM network. This command provides an overall picture of the stability of the network. The no form of this command disables debugging output. If the interface is successfully communicating with the Digital Subscriber Line Access Multiplexer (DSLAM) at the telephone company, the modem state is 0x10. If the interface is not communicating with the DSLAM, the modem state is 0x8. Example 19-5 shows an ADSL line that is up and training successfully. Example 19-6 shows an ADSL line that is not communicating correctly. Note that the modem state does not transition to 0x10. Example 19-5 Viewing ATM Interface Processor Events—Success Router# debug atm eventsRouter# 00:02:57: DSL: Send ADSL_OPEN command. 00:02:57: DSL: Using subfunction 0xA 00:02:57: DSL: Using subfunction 0xA00:02:57: DSL: Sent command 0x5 00:02:57: DSL: Received response: 0x26 00:02:57: DSL: Unexpected response 0x2600:02:57: DSL: Send ADSL_OPEN command. 00:02:57: DSL: Using subfunction 0xA 00:02:57: DSL: Using subfunction 0xA00:02:57: DSL: Sent command 0x5 00:03:00: DSL: 1: Modem state = 0x8 00:03:02: DSL: 2: Modem state = 0x1000:03:05: DSL: 3: Modem state = 0x10 00:03:07: DSL: 4: Modem state = 0x10 00:03:09: DSL: Received response: 0x2400:03:09: DSL: Showtime! 00:03:09: DSL: Sent command 0x11 00:03:09: DSL: Received response: 0x6100:03:09: DSL: Read firmware revision 0x1A04 00:03:09: DSL: Sent command 0x31 00:03:09: DSL: Received response: 0x1200:03:09: DSL: operation mode 0x0001 00:03:09: DSL: SM: [DMTDSL_DO_OPEN -> DMTDSL_SHOWTIME] Example 19-6 Viewing ATM Interface Processor Events—Failure Router# debug atm events Router# 00:02:57: DSL: Send ADSL_OPEN command.00:02:57: DSL: Using subfunction 0xA 00:02:57: DSL: Using subfunction 0xA 00:02:57: DSL: Sent command 0x500:02:57: DSL: Received response: 0x26 00:02:57: DSL: Unexpected response 0x26 00:02:57: DSL: Send ADSL_OPEN command.00:02:57: DSL: Using subfunction 0xA 00:02:57: DSL: Using subfunction 0xA 00:02:57: DSL: Sent command 0x500:03:00: DSL: 1: Modem state = 0x8 00:03:00: DSL: 1: Modem state = 0x8
19-8 Book Title OL-xxxxx-xx Chapter 19 Troubleshooting ATM Troubleshooting Commands 00:03:00: DSL: 1: Modem state = 0x800:03:00: DSL: 1: Modem state = 0x8 00:03:00: DSL: 1: Modem state = 0x8 00:03:00: DSL: 1: Modem state = 0x8 debug atm packet Command Use the debug atm packet command to display all process-level ATM packets for both outbound and inbound packets. The output reports information online when a packet is received or a transmission is attempted. The no form of this command disables debugging output. CautionBecause the debug atm packet command generates a significant amount of output for every packet processed, use it only when network traffic is low, so that other system activities are not adversely affected. The command syntax is: debug atm packet [interface atm number [vcd vcd-number][vc vpi/vci number]] no debug atm packet [interface atm number [vcd vcd-number][vc vpi/vci number]] where the keywords are defined as follows: interface atm number(Optional) ATM interface or subinterface number. vcd vcd-number(Optional) Number of the virtual circuit designator (VCD). vc vpi/vci numberVPI/VCI value of the ATM PVC. Example 19-7 shows sample output for the debug atm packet command. Example 19-7 Viewing ATM Packet Processing Router# debug atm packetRouter# 01:23:48:ATM0(O): VCD:0x1 VPI:0x1 VCI:0x64 DM:0x0 SAP:AAAA CTL:03 OUI:000000 TYPE:0800 Length:0x7001:23:48:4500 0064 0008 0000 FF01 9F80 0E00 0010 0E00 0001 0800 A103 0AF3 17F7 0000 01:23:48:0000 004C BA10 ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD 01:23:48:ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD 01:23:48:ABCD ABCD ABCD ABCD ABCD 01:23:48: 01:23:48:ATM0(I):VCD:0x1 VPI:0x1 VCI:0x64 Type:0x0 SAP:AAAA CTL:03 OUI:000000 TYPE:0800 Length:0x70 01:23:48:4500 0064 0008 0000 FE01 A080 0E00 0001 0E00 0010 0000 A903 0AF3 17F7 0000 01:23:48:0000 004C BA10 ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD 01:23:48:ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD 01:23:48:ABCD ABCD ABCD ABCD ABCD 01:23:48: Ta b l e 19-3 describes some of the fields shown in the debug atm packet command output. Ta b l e 19-3 debug atm packet Command Output Description Field Description AT M 0Interface that is generating the packet. (O)Output packet. (I) would mean receive packet.
19-9 Book Title OL-xxxxx-xx Chapter 19 Troubleshooting Software Upgrade Methods Software Upgrade Methods Several methods are available for upgrading software on the Cisco 860 and Cisco 880 series Integrated Services Routers, including: Copy the new software image to flash memory over the LAN or WAN while the existing Cisco IOS software image is operating. Copy the new software image to flash memory over the LAN while the boot image (ROM monitor) is operating. Copy the new software image over the console port while in ROM monitor mode. From ROM monitor mode, boot the router from a software image that is loaded on a TFTP server. To use this method, the TFTP server must be on the same LAN as the router. Recovering a Lost Password To recover a lost enable or lost enable-secret password: 1.Change the Configuration Register 2.Reset the Router 3.Reset the Password and Save Your Changes (for lost enable secret passwords only) 4.Reset the Configuration Register Value NoteRecovering a lost password is only possible when you are connected to the router through the console port. These procedures cannot be performed through a Telnet session. TipSee the “Hot Tips” section on Cisco.com for additional information on replacing enable secret passwords. VCD: 0xnVirtual circuit associated with this packet, where n is some value. VPI: 0xnVirtual path identifier for this packet, where n is some value. DM: 0xnDescriptor mode bits, where n is some value. Length: nTotal length of the packet (in bytes) including the ATM headers. Table 19-3 debug atm packet Command Output Description (continued) Field Description
19-10 Book Title OL-xxxxx-xx Chapter 19 Troubleshooting Recovering a Lost Password Change the Configuration Register To change a configuration register, follow these steps: Step 1Connect an ASCII terminal or a PC running a terminal emulation program to the CONSOLE port on the Fthe router. Step 2Configure the terminal to operate at 9600 baud, 8 data bits, no parity, and 1 stop bit. Step 3At the privileged EXEC prompt (router_name #), enter the show version command to display the existing configuration register value (shown in bold at the bottom of this output example): Router# show version Cisco IOS Software, C880 Software (C880-ADVENTERPRISEK9-M), Version 12.3(nightly.PCBU_WIRELESS041110) NIGHTLY BUILD, synced to haw_t_pi1_pcbu HAW_T_PI1_PCBU_200 40924 Copyright (c) 1986-2004 by Cisco Systems, Inc.Compiled Thu 11-Nov-04 03:37 by jsomebody ROM: System Bootstrap, Version 1.0.0.6(20030916:100755) [jsomebody], DEVELOPMENT SOFTWARE Router uptime is 2467 minutes System returned to ROM by power-onSystem image file is flash:c880-adventerprisek9-mz.pcbu_wireless.041110 This product contains cryptographic features and is subject to UnitedStates and local country laws governing import, export, transfer and use. Delivery of Cisco cryptographic products does not imply use. Delivery of Cisco cryptographic products does not implyImporters, exporters, distributors and users are responsible for compliance with U.S. and local country laws. By using this product you agree to comply with applicable laws and regulations. If you are unableto comply with U.S. and local laws, return this product immediately. A summary of U.S. laws governing Cisco cryptographic products may be found at:http://www.cisco.com/wwl/export/crypto/tool/stqrg.html If you require further assistance please contact us by sending email [email protected]. Cisco 877 (MPC8272) processor (revision 0x00) with 59392K/6144K bytes of memory. Processor board ID MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x104 FastEthernet interfaces 1 ATM interface 1 802.11 Radio128K bytes of non-volatile configuration memory. 20480K bytes of processor board System flash (Intel Strataflash) Configuration register is 0x2102 Step 4Record the setting of the configuration register. Step 5To enable the break setting (indicated by the value of bit 8 in the configuration register), enter the config-register 0x01 command from privileged EXEC mode. Break enabled—Bit 8 is set to 0. Break disabled (default setting)—Bit 8 is set to 1.
19-11 Book Title OL-xxxxx-xx Chapter 19 Troubleshooting Recovering a Lost Password Reset the Router To reset the router, follow these steps: Step 1If break is enabled, go to Step 2. If break is disabled, turn the router off (O), 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 3. NoteSome terminal keyboards have a key labeled Break. If your keyboard does not have a Break key, see the documentation that came with the terminal for instructions on how to send a break. Step 2Press break. The terminal displays the following prompt: rommon 2> Step 3Enter confreg 0x142 to reset the configuration register: rommon 2> confreg 0x142 Step 4Initialize the router by entering the reset command: rommon 2> reset 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 --- Step 5Enter no in response to the prompts until the following message is displayed: Press RETURN to get started! Step 6Press Return. The following prompt appears: Router> Step 7Enter the enable command to enter enable mode. Configuration changes can be made only in enable mode: Router> enable The prompt changes to the privileged EXEC prompt: Router# Step 8Enter the show startup-config command to display an enable password in the configuration file: Router# show startup-config If you are recovering an enable password, do not perform the steps in the following “Reset the Password and Save Your Changes” section. Instead, complete the password recovery process by performing the steps in the “Reset the Configuration Register Value” section. If you are recovering an enable secret password, it is not displayed in the show startup-config command output. Complete the password recovery process by performing the steps in the following “Reset the Password and Save Your Changes” section.
19-12 Book Title OL-xxxxx-xx Chapter 19 Troubleshooting Recovering a Lost Password Reset the Password and Save Your Changes To reset your password and save the changes, follow these steps: Step 1Enter the configure terminal command to enter global configuration mode: Router# configure terminal Step 2Enter the enable secret command to reset the enable secret password in the router: Router(config)# enable secret password Step 3Enter exit to exit global configuration mode: Router(config)# exit Step 4Save your configuration changes: Router# copy running-config startup-config Reset the Configuration Register Value To reset the configuration register value after you have recovered or reconfigured a password, follow these steps: Step 1Enter the configure terminal command to enter global configuration mode: Router# configure terminal Step 2Enter the configure register command and the original configuration register value that you recorded. Router(config)# config-reg value Step 3Enter exit to exit configuration mode: Router(config)# exit NoteTo return to the configuration being used before you recovered the lost enable password, do not save the configuration changes before rebooting the router. Step 4Reboot the router, and enter the recovered password.
19-13 Book Title OL-xxxxx-xx Chapter 19 Troubleshooting Managing Your Router with SDM Managing Your Router with SDM The Cisco SDM tool is a free software configuration utility, supporting the Cisco 860 and Cisco 880 series access routers. It includes a web-based GUI that offers the following features: Simplified setup Advanced configuration Router security Router monitoring
19-14 Book Title OL-xxxxx-xx Chapter 19 Troubleshooting Managing Your Router with SDM