Cisco 3650 stuck in rommon mode

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Cisco 3650 stuck in rommon mode

I would like to show you how to recover a Cisco switch ex.

ROMmon Recovery for the Cisco 3600/3700/3800 Series Routers

Here what I think is incorrect in the documentation and else where they copy pasted the instructions without verifying it. So follow the steps below if you are also trying to recover the switch from boot load using TFTP to transfer file. If you like to use USB flash drive to transfer image to the flash click here.

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Make sure the variable are set in the same format below. Note: After flash: you need to specify full file name or else it will not accept. The steps as as below. I hope I have covered every step here. Please leave a comment and let me know if there is anything you feel is incorrect and if this have helped you or not.

Please also look at this blog post. Superb blog! Do you have any tips for aspiring writers? Would you recommend starting with a free platform like Wordpress or go for a paid option? Any recommendations? Many thanks! SE5 flash:clanbasek9-mz.

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SE5: no such device. SE5 gateway is my laptop IP address Am trying to use Transfer will start, but is going to take a lot of time.

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Issue the show version command in order to verify the file, if is OK, proceed to next step otherwise retry transfer.The switch: prompt indicates that the switch has not booted completely and requires the user to complete the boot process.

The reason for this problem could be an incorrect boot statement which means either the image name IOS file name is incorrect or the syntax of the command is wrong. After the image is copied, clear the current boot statement and change it to point to the new image. Issue the show boot command to see the current boot parameters.

To verify that you have configured the correct boot statement on the switch, perform the following steps:. Issue the show version command in order to verify the current version of software that you run.

Issue the dir flash: filename command in order to display the Cisco IOS image. Issue the show boot command again in order to verify that the boot statement is set correctly. Buy or Renew. Find A Community. We're here for you! Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for. Search instead for. Did you mean:. Labels: Other Switching. Core issue The switch: prompt indicates that the switch has not booted completely and requires the user to complete the boot process.

cisco 3650 stuck in rommon mode

Resolution After the image is copied, clear the current boot statement and change it to point to the new image. To verify that you have configured the correct boot statement on the switch, perform the following steps: 1. Latest Contents. Created by dolanduck. Created by Senbonzakura on PM.

When dealing with Hosted Voice and VOIP phones connected to your Switches and Firewalls, what are some settings you'd recommend for an ideal environment? For example, what I notice the most is boradcast storm level 10 along with being attached to vlans.

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Created by repulsor on PM. For a couple years, this switch has been trouble free. Now, all of a sudden I've noticed that it likes to randomly reboot. If I unplug all cables from it and start to plug them back in, its ok for the first cable.

Second cable plugged in Not able to upadate Cisco Packet Tracer Software. Created by DarshilShah on PM. As soon as I try to install new version it asks ato login but shows my password as incorrect and I am pretty sure I am entering correct, Though. When I try to reset the password I don't get password reset link in my registered email account. Need urgent Hel Multicast Mapping Agents. Created by zekebashi on PM. I was analyzing our topology and found out that there are three L3 switches that are configured as mapping agents.

My understanding is that there should be a single mappi Create Please login to create content.This section explains how to recover a Catalyst Series Supervisor from a missing or corrupted system image, or an incorrect boot variable.

The switch provides a number of ways to recover should any of these events occur on the Supervisor Engine. When the Supervisor-equipped switch boots up or resets, there are these two possibilities:. The switch cannot find the image, the image is corrupt, no image is present in the bootflash device, or the boot variable is set incorrectly and therefore winds up in ROM monitor ROMmon mode. In ROMmon mode, the switch must be able to locate a valid system image from either the bootflash device.

There is no option for Xmodem or Ymodem which allows you to copy an image through the console port. You can issue the dir bootflash: command to view the contents of the Supervisor Flash device, as this example shows.

Troubleshoot Cisco 4000 Series ISR Stuck in ROMMON

Issue the verify command to determine if the image has a valid checksum, as this example shows:. Since the switch recognizes all Flash devices in ROMmon mode, you can issue the dir device-name commands to show the Flash contents, as is demonstrated in the remaining sections of this document.

Notice in the previous example, there is only a single boot image in bootflash. You can have as many system images as you can fit in the bootflash:.

Bootflash size is fixed at 64 MB. The following are the ROMmon variables that Catalyt supports and examples to set them:. A value of "yes" disables auto boot and enables manual booting. A value of "no" enables auto boot. A switch reload or crash after the image was corrupted or deleted. See the Recover from a Corrupt or Missing Image section of this document for more information. See the Recover from a Continuous Reboot section of this document to determine if a valid system image is present in the bootflash:.

If there is no file present, see the Recover from a Corrupt or Missing Image section of this document. The boot variable is incorrect, but a valid image is still present. See the Recover from a Continuous Reboot section of this document for more information. If you try to Telnet to any of the interfaces it fails, and if you are connected to the console port of the Supervisor, you see this prompt:.

The switch might end up in a continuous reboot sequence if the boot variable is not set to the correct system image file and proper destination device. You should already have a console connection to the Supervisor to see the previous output and perform the recovery. On a standard Windows operating system platform, configure a HyperTerminal connection directly to COM1 with these settings:. Use a DB-9 connector on the PC. This is shown in this example:. The reason the switch reboots continuously is because the system image file name specified does not exist, but there is a valid file in the bootflash.

Also, the system image file name specified is case sensitive.If you have ever experienced the ROMmon mode problem, you probably came across one of the following:. In this article, I will describe the problem of a router stuck in ROMmon mode, together with my recent experience.

For those of you that are not familiar with the term ROMmon ROM monitor mode, it is a bootstrap program that initializes the hardware and boots the Cisco IOS software when you power on or reload a router or switch. Also, Cisco Internetwork Operating System IOS is the system software in Cisco devices, and is usually and by default stored in a memory area called flash as a.

Flash memory provides non-volatile storage, which means that the content of the memory is not lost when the device loses power or reloads.

When you power up a Cisco router or switch, it first begins the power-on self-test POST to ensure that the device functions properly, and then it looks for the IOS from flash memory.

If you ever face the situation in which your router or switch goes to ROMmon mode during the boot process, you should first check the value of the configuration register. The value indicates the behaviour of the router and is set to 0x by default, which means that the router will attempt to load a Cisco IOS image from flash memory and load the startup configuration file from NVRAM.

This value can be changed from the console of the router. If you are a novice, exploring the capabilities of your new device, you could accidentaly change this value by entering confreg 0x instead of 0x, which will result in the router stuck in ROMmon mode when reloaded or powered on. There are few commands available in ROMmon mode and you can view them by typing? To check the value of your configuration register from the ROMmon prompt, enter the confreg command:.

As you can see from the output above, the configuration register is set to a value that forces the router to go into the ROMmon mode each time it is reloaded. To solve this problem, you should change the value of the configuration register as shown below:.

So, if your router is stuck in ROMmon mode, you should know the value of your configuration register, based on which you can determine the router behavior and eventually solve the problem. The problem in my case was that the router Cisco could not boot — it went into ROMmon mode immediately upon starting it.

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So my first, but wrong assumption was that there was something wrong with the IOS, so I decided to change it. The DRAM card was physically detached from the slot which was the result of my clumsy handling the device and I had to put it so it fits.

cisco 3650 stuck in rommon mode

Next time I face some networking issue, I will probably start troubleshooting the physical layer first! You also need to know about the physical layer components of a router or switch.

Our Cisco core switch went to Rommon mode immediately when we try to reload the IOS because the power went off and the issue came. Good article explaining about ROMmon mode. Always start troubleshooting at the layer 1. Your email address will not be published. Notify me of followup comments via e-mail. You can also subscribe without commenting. This site uses Akismet to reduce spam. Learn how your comment data is processed. Ingrid Belosa is a networking enthusiast from Croatia.

She is here to help you with grasping networking concepts. Simon Gawar May 15, at pm. Akinola October 16, at am. Mike December 11, at pm. Leave a Reply Cancel reply Your email address will not be published.This document explains how to recover Cisco Catalyst fixed configuration switches from a corrupt or missing system image or an incorrectly set boot variable.

Cisco 3850 IOS emergency recovery

If you have not already done so, connect a PC to the console port of the switch. For information on how to connect a terminal to a Catalyst fixed configuration switch, refer to Connecting a Terminal to the Console Port on Catalyst Switches.

Use a terminal emulation program such as Microsoft Windows HyperTerminal in order to establish the console session. These are the settings:. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared default configuration.

If your network is live, make sure that you understand the potential impact of any command. Refer to Cisco Technical Tips Conventions for more information on document conventions. The switch: prompt indicates that the switch has not booted completely and requires the user to complete the boot process. The corrupt or missing image can be the result of a failed download.

In this case, the image has a bad checksum or a failed software upgrade, and the upgrade procedure was not followed properly. There is the possibility that the user deleted the image but did not replace the image. A boot variable can have been set incorrectly. Normally, the switch attempts to automatically boot the next valid image in the Flash file system.

Here is an example:. If there is no valid backup image from which to boot, the boot process fails completely. If the switch is in a continuous reboot, complete one of the procedures in this step, which depends on your switch model.

The terminal application and operating system that you use determine the break sequence to use.

cisco 3650 stuck in rommon mode

HyperTerminal that runs on Windows uses Ctrl-Break. The Cisco IOS image files are. If no Cisco IOS image files or image directories exist, you see this:. If your Flash directory looks like this, proceed directly to Step 4.

Step 4 recovers the switch with an Xmodem file transfer. If there is still an image in Flash, issue the boot command in order to try to recover the switch. Before you issue the boot command, verify where the Cisco IOS image is stored in the Flash directory.

The location in which the image is stored can differ, which depends on your switch model. The Cisco IOS image file. The organization of the Flash file system on a Catalyst,and is a little different. You can store the Cisco IOS image file in the flash: directory.Go to Solution. This shouldn't be different from other similar Catalyst series: Connect to the console of the switch.

Power off the switch, then press the MODE button and while keeping it pressed, plug the power back in. Keep the MODE button pressed and watch the console output. View solution in original post. Buy or Renew. Find A Community. We're here for you! Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for. Search instead for. Did you mean:.

cisco 3650 stuck in rommon mode

Many thanks in advance. Labels: Other Switching. Everyone's tags 2. Tags: Accepted Solutions. Peter Paluch.

Hall of Fame Cisco Employee. Aleksey,This shouldn't be. Aleksey, This shouldn't be different from other similar Catalyst series: Connect to the console of the switch. Latest Contents. Created by Santosh Sharma on PM. EEM script in this case can be chall Created by hiarteag on AM.

Recovering Catalyst Fixed Configuration Switches from a Corrupted or Missing Image

Why show ip bgp table is not showing any best path with expr Created by upadhyayambition1 on PM. Created by ciscomoderator on AM. Create Please login to create content. Related Content. Blogs Networking Blogs Networking News. Content for Community-Ad. Follow our Social Media Channels.The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared default configuration.

If you are working in a live network, ensure that you understand the potential impact of any command before using it. Refer to Cisco Technical Tips Conventions for more information on document conventions. Try to boot from that image. If the file is valid, this brings you back to normal operation mode:. If none of the files are valid, you have to download a new one that uses one of these procedures:. In the event that you have a similar router, or at least one other router which has a compatible PCMCIA Flash card filesystem, you can also use that Flash card in order to recover the router.

If both routers are identical, or same series, you can use the Flash card from the other router in order to boot the one you want to recover. Once the router is up and runs you can copy the image to Flash and set the boot variable so that the router boots through this new image everytime it is rebooted. Contents Introduction.


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