Recovering C9000 Switches from a Rommon Boot Loop
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- เผยแพร่เมื่อ 5 ก.ย. 2024
- The purpose of this video is to provide the necessary knowledge to Perform a Rommon Recovery on C9000. switches, the process will allow you to recover the switch when facing a booting loop scenario.
Hi @cisco i have same issue in my switch cisco 9220L 48 P
How about if the switch is in rommon and has empty flash: and fails to read usbflash0 and usbflash1? Also setting an IP address doesn't initiate any ports, so TFTP is not possible. Do I have a super broken switch?
Hi there, thanks for reaching out, and we appreciate your question! What you're describing does point towards a critical issue, but it doesn't necessarily mean the switch is beyond repair.
The switches' IOS and configuration may have accidentally been deleted, or there is a hardware failure. You can also try console access, checking for error messages, recovery procedures, or emergency boot options. If you know the model number, you can also explore documentation on cs.co/6058d0lsn for troubleshooting or contact TAC. We hope this information helps!
My switch flash went into RO mode how can I fix that.
Hi there, we're sorry to hear about your experience, and there are a few steps you can take to try to resolve this issue.
1. Check Filesystem Status: First, check the status of the filesystem. You can do this by issuing the command `dir flash:` from the ROMMON prompt to see if the filesystem is indeed in read-only mode.
2. Attempt Filesystem Repair: Some Cisco devices have a filesystem check and repair utility that can be run from ROMMON. The command might look like `fsck flash:` or similar, depending on the model of the switch. This can potentially fix any filesystem errors and return it to read/write mode.
3. Change Filesystem Mode: If the filesystem is in read-only mode, you might be able to change its mode to read/write. This can sometimes be done with a command like `set FILESYSTEM_MODE rw`, again depending on the specific model and version of the switch.
4. Software Recovery: If the filesystem is corrupted, you may need to perform a software recovery. This typically involves using TFTP to load a new image onto the switch. You would need to set up a TFTP server with the correct IOS image and then use the `tftpdnld` command or similar from ROMMON to download and install the image.
5. Replace the Flash Memory: If the flash memory is physically damaged and that's why it's stuck in RO mode, you might need to replace the flash memory hardware. This is more complex and might require sending the switch to Cisco for repair or replacing the switch entirely.
6. Contact Cisco Support: If you're unable to resolve the issue on your own, it's a good idea to contact Cisco Technical Support. They can provide guidance specific to your model and situation, and if necessary, they can also provide repair services.
Remember to always have a backup of your switch configuration and IOS image before attempting any recovery operations, and be aware that some operations can be disruptive and might require downtime. If you're not comfortable performing these steps, it's best to consult with Cisco Support. We hope this information helps!
its my error : Bus is busy - 0x2(status)
ERROR: TAM write failed (3000)
ERROR: TAM write failed (3000)
TAM Init Failed
Hi there, we're sorry to hear that you're having trouble. We have a few things you can try to resolve this.
Check Hardware Connections: Ensure that all cables and hardware components are properly connected and not damaged.
Power Cycle the Switch: Sometimes, simply powering off the switch, waiting a few moments, and then powering it back on can resolve boot issues.
Access ROMMON Mode:
Connect to the switch using a console cable.
Power on the switch and press the Break key (or Ctrl + Break on some keyboards) during the initial boot sequence to enter ROMMON mode.
Check Boot Variables:
In ROMMON mode, check the boot variables using the set command.
Ensure that the boot variable is set to a valid image. You can set the boot variable using the BOOT command, for example:
BOOT=flash:
Load a New Image:
If the current image is corrupted, you may need to load a new image onto the switch. This can be done via TFTP or USB.
For TFTP:
tftpdnld -r
For USB:
boot usbflash0:
Reset to Factory Defaults:
If other methods fail, you might need to reset the switch to factory defaults. This can often be done with a command like:
confreg 0x2142
reset
After the switch reboots, you can then reset the configuration register to its original value and reload the switch.
If the issue persists, please open a case with support at: cs.co/6052Y5TJO. We hope this information helps!