Cisco 3925 ios upgrade procedure

In the following example, no value is entered; therefore, the system prompts for each bit in the register:. This section describes how to obtain information on USB devices that are installed in the router.

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Displays the contents of the USB flash device, including directories, files, permissions, and sizes. Shows the targeted USB flash devices that are inserted in the router and the valid device names that may or may not be currently inserted. Directory of usbflash0: Devices in device table: Using this command improperly can adversely affect the functioning of the router. IOMEM size calculated is greater than maximum allowed during boot up.

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  • Before you can enter the tftpdnld command, you must set the ROM monitor environment variables. Connect the TFTP server to a fixed network port on your router. Sets the TFTP server from which the software is downloaded. Sets the name and location of the file that is downloaded to the router. Optional Sets the input port to use one of the Gigabit Ethernet ports. The default is 0. Optional Sets the Gigabit Ethernet port speed mode, with these options:. Optional Determines whether the router performs a checksum test on the downloaded image. Optional Designates the targeted flash device as compact flash or USB flash.

    The default is Optional Sets the amount of time, in seconds, before the download process times out. The default is seconds minutes. Optional Sets the amount of time, in seconds, before the client will resend the ACK packet to indicate to the server to continue transmission of the remaining packets. The default is 5 seconds. Optional Configures how the router displays file download progress, with these options:. Displays the ROM monitor environment variables. Verify that you correctly configured the ROM monitor environment variables.

    Downloads the system image specified by the ROM monitor environment variables. Confirms that you want to continue with the TFTP download. Sample Output for Recovering the System Image tftpdnld. This section lists and describes some ROM monitor commands that can be used to troubleshoot router crashes and hangs. Most ROM monitor debug commands are functional only when the router crashes or hangs.

    If you enter a debug command when crash information is not available, the following error message appears:. The ROM monitor commands in this section are all optional and can be entered in any order. A router or system crash is a situation in which the system detects an unrecoverable error and restarts itself. The errors that cause crashes are typically detected by processor hardware, which automatically branches to special error-handling code in the ROM monitor. The ROM monitor identifies the error, prints a message, saves information about the failure, and restarts the system.

    For detailed information about troubleshooting crashes, see the Troubleshooting Router Crashes and Understanding Software-forced Crashes tech notes. A router or system hang is a situation in which the system does not respond to input at the console port or to queries sent from the network, such as Telnet and Simple Network Management Protocol SNMP. Router hangs are discussed in detail in the Troubleshooting Router Hangs tech note. Under certain mis-configuration situations, it can be impossible to establish a console connection with the router due to a speed mismatch or other incompatibility.

    The most obvious symptom is erroneous characters in the console display. If a ROM monitor failure of this type occurs, you may need to change a jumper setting on the motherboard so that the router can boot for troubleshooting. Procedures for accessing the motherboard and jumper locations are described in the installation of internal components section of the hardware installation document for your router.

    The jumper forces the data rate to a known good value. Do not manually reload or power-cycle the router unless reloading or power cycling is required for troubleshooting a router crash. The system reload or power-cycle can cause important information to be lost that is needed for determining the root cause of the problem. Optional Displays the CPU context at the time of the fault. Optional Displays an entire individual stack frame. Optional Displays return information from the last booted system image.

    Optional Displays memory information, including:. Alternatively, using the meminfo -l command provides information on supported DRAM configurations for the router. You can also use the meminfo -l command to show the supported DRAM configurations for the router. The following is sample output for the command:.

    Displays a list of the files and directories in flash memory. Note Options to the boot command are -x load image but do not execute and -v verbose. Sample Output for the dir flash: Command in ROM Monitor mode.


    The following sections provide references related to using the ROM monitor. Break key sequence combinations for entering ROM monitor mode within the first 60 seconds of rebooting the router. Using the boot image Rx-boot to recover or upgrade the system image. Troubleshooting Router Crashes. Understanding Software-forced Crashes.

    Access Routers Software Upgrade Procedures

    Troubleshooting Router Hangs. Technical Assistance Center TAC home page, containing 30, pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco. You must have an account at Cisco. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear. Skip to content Skip to footer. Book Contents Book Contents. Find Matches in This Book. PDF - Complete Book 3.

    March 30, Using ROM Monitor. Using ROM Monitor The ROM monitor is accessed during power up or reload when the router does not find a valid system image, the last digit of the boot field in the configuration register is 0, or you enter the Break key sequence during the first 5 seconds after reloading the router. The router boots to ROM monitor mode when one of the following occurs: During power up or reload, the router did not find a valid system image. The last digit of the boot field in the configuration register is 0 for example, 0x or 0x0. The Break key sequence was entered during the first 60 seconds after reloading the router.

    Use ROM monitor in the following situations: Manually loading a system image—You can load a system image without configuring the router to load that image in future system reloads or power-cycles. This can be useful for testing a new system image or for troubleshooting. Upgrading the system image when there are no TFTP servers or network connections, and a direct PC connection to the router console is the only viable option—See information about upgrading the system image in the configuration documentation for your router.

    Disaster recovery—Use one of the following methods for recovering the system image or configuration file: For a complete list of guidelines and Cisco products adherence to accessibility, see the Cisco Accessibility Products document at: Enter your password if prompted. Step 3 Press Ctrl - Break. Router send break Interrupts the router reload and enters ROM monitor mode. You must perform this step within 60 seconds after you enter the reload command. Reload requested by console. Reload Reason: Reload command. If you use the Break key sequence to enter ROM monitor mode when the router would otherwise have booted the system image, you can exit ROM monitor mode by doing one of the following: To set the configuration register without affecting the baud rate, use the current configuration register setting by entering the show ver inc configuration command, and then replacing the last rightmost number with a 0 in the configuration register command.

    The 0x0 setting forces the router to boot to the ROM monitor at the next system reload. Because of the 0x0 configuration register setting, the router boots to ROM monitor mode. Examples The following example shows how to set the configuration register to boot to ROM monitor mode: Configured from console by console Router write memory Building configuration Reload Command. System Bootstrap, Version Step 2 command -? Prerequisites Determine the filename and location of the system image that you want to load.

    Boot the first image in flash memory. Boot the first image or a specified image in flash memory. Boot from the boothelper image because it does not recognize the device ID. This form of the command is used to boot a specified image from a network TFTP server. Boot the image stored on the USB flash device. Options for the boot command are -x load image but do not execute and -v verbose. Examples The following example shows how to load boot flash memory and USB boot flash memory: SSA program load complete, entry point: Using 5 percent iomem.

    Compiled Thu Jul 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 for compliance with U. One thing you might have to deal with is authentication. Most FTP servers will require a username and password. Here is the topology I will use:. We can globally configure the username and password that we want to use for the FTP server.

    When you use the copy command, Cisco IOS will use these values for authentication. This is a great method because of two reasons:. So far we copied a couple of files but how do we know that these files are valid? We can verify this checksum on our router:.

    How to upgrade Cisco IOS Image

    This MD5 checksum is the same as the one we found on the Cisco website. This tells us that we have the same file as Cisco published and that the file has not been tampered with. If the checksum fails, maybe someone has added something nasty to the image. Which IOS image will it select when the router boots? Deleting the old IOS image is one option but there is another way. Most routers will select the first filename that they find on the flash memory so in our case, it means it would boot the older IOS image.

    We can change this with the boot sytem command:. We also checked how to verify the integrity of the file with the MD5 checksum and how to configure your router to boot the new IOS image. Hi Rene!

    RouterGeek » How to Upgrade IOS on a Cisco Router

    When we upgrade IOS of router what about configuration? Is it still the same? Ask a question or join the discussion by visiting our Community Forum. Newer routers also support copying from USB sticks. This will show up as usbflash: Configurations Want to take a look for yourself? Here you will find the configuration of each device.