Cisco Systems Router 1800 Series User Manual
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14-9 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 14 Troubleshooting Software Upgrade Methods Software Upgrade Methods Several methods are available for upgrading software on the Cisco 1800 series integrated services fixed-configuration 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. DM: 0xnDescriptor mode bits, where n is some value. Length: nTotal length of the packet (in bytes) including the ATM headers. Table 14-3 debug atm packet Command Output Description (continued) Field Description
14-10 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 14 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 rear panel of the 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, C180X Software (C180X-ADVENTERPRISEK9-M), Version 12.4(1.8)PI2c ENGINEERING WEEKLY BUILD, synced to haw_t BASE_LABEL_OF_V124_2_T_THROTTLE Copyright (c) 1986-2005 by Cisco Systems, Inc. Compiled Fri 27-May-05 16:14 by ccai ROM: System Bootstrap, Version 12.3(8r)YH4, RELEASE SOFTWARE (fc1) ng-esw1-uut1 uptime is 1 hour, 21 minutes System returned to ROM by power-on System image file is flash:bootimage.ng-esw1-uut1 This product contains cryptographic features and is subject to United States and local country laws governing import, export, transfer anduse. Delivery of Cisco cryptographic products does not imply third-party authority to import, export, distribute or use encryption. Importers, exporters, distributors and users are responsible forcompliance with U.S. and local country laws. By using this product you agree to comply with applicable laws and regulations. If you are unable to 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 to [email protected]. Cisco 1801 (MPC8500) processor (revision 0x200) with 118784K/12288K bytes of memory. Processor board ID FHK091412QA, with hardware revision 0000 9 FastEthernet interfaces 1 ISDN Basic Rate interface1 ATM interface 31360K bytes of ATA CompactFlash (Read/Write) Configuration register is 0x2102 Step 4Record the setting of the configuration register. Step 5Enter the config-register value command to set the new configuration register value. For example, to 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.
14-11 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 14 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, omit the following “Reset the Password and Save Your Changes” section, and 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.
14-12 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 14 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.
14-13 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 14 Troubleshooting Managing Your Router with SDM Managing Your Router with SDM The Cisco SDM tool is a free software configuration utility, supporting the Cisco 1800 series integrated services fixed-configuration routers. It includes a web-based GUI that offers the following features: Simplified setup Advanced configuration Router security Router monitoring
14-14 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Chapter 14 Troubleshooting Managing Your Router with SDM
A-1 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 APPENDIXA Cisco IOS Software Basic Skills Understanding how to use Cisco IOS software can save you time when you are configuring your router. If you need a refresher, take a fe w minutes to read this appendix. This appendix contains the following sections: Configuring the Router from a PC Understanding Command Modes Getting Help Enable Secret Passwords and Enable Passwords Entering Global Configuration Mode Using Commands Saving Configuration Changes Summary Where to Go Next If you are already familiar with Cisco IOS software, go to one of the following chapters: Chapter 1, “Basic Router Configuration” Chapter 2, “Sample Network Deployments” One of the configuration topic chapters in Part 3 Configuring the Router from a PC You can configure your router from a PC connected through the console port using terminal emulation software. The PC uses this software to send commands to your router. Ta b l e A-1 lists some common types of this software, which are based on the type of PC you are using. Ta b l e A-1 Terminal Emulation Software PC Operating SystemSoftware Windows 95, Windows 98, Windows 2000, Windows NT, Windows XP HyperTerm (included with Windows software), ProComm Plus Windows 3.1 Terminal (included with Windows software) Macintosh ProComm, VersaTerm (supplied separately)
A-2 Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide OL-6426-02 Appendix A Cisco IOS Software Basic Skills Understanding Command Modes You can use the terminal emulation software to change settings for the type of device that is connected to the PC, in this case a router. Configure the software to the following standard VT-100 emulation settings so that your PC can communicate with your router: 9600 baud 8 data bits No parity 1 stop bit No flow control These settings should match the default settings of your router. To change the router baud, data bits, parity, or stop bits settings, you must reconfigure parameters in the ROM monitor. For more information, see Appendix C, “ROM Monitor.” To change the router flow control setting, use the flowcontrol line configuration command. For information on how to enter global configuration mode so that you can configure your router, see the “Entering Global Configuration Mode” section later in this chapter. Understanding Command Modes This section describes the Cisco IOS command mode structure. Each command mode supports specific Cisco IOS commands. For example, you can use the interface type number command only from global configuration mode. The following Cisco IOS command modes are hierarchical. When you begin a router session, you are in user EXEC mode. User EXEC Privileged EXEC Global configuration Ta b l e A-2 lists the command modes that are used in this guide, how to access each mode, the prompt you see in that mode, and how to exit to a mode or enter the next mode. Because each mode configures different router elements, you might need to enter and exit modes frequently. You can see a list of available commands for a particular mode by entering a question mark (?) at the prompt. For a description of each command, including syntax, see the Cisco IOS 12.3 documentation set.