ā05-22-2017 11:08 AM - edited ā03-08-2019 10:41 AM
Hi
we have a 3850 which fails to boot I can see the files on the flash however it is read only so can't make any changes. If I boot from USB switch performs firmware upgrades but then fails to boot have tried booting numerous times from USB. Tried emergency load from tftp server first part loads agreed to format flash switch waits to download files 2nd time but nothing is requested from tftp server. Load of hyroglifics in the set statement I tried ignoring the startup configuration but no difference.
how do I delete or format the flash so I can start from scratch
ā05-22-2017 12:36 PM
how do I delete or format the flash so I can start from scratch
try:
format flash:
you have options to format fat16 or 32.
HTH
ā05-23-2017 03:03 AM
Reza thanks for replying, the flash: is Read-Only so you cant format, change or delete anything I think there is a hardware fault as it makes no difference even if the Emergency-install procedure is followed which appears to format or replace the files on the flash:
ā05-23-2017 06:56 AM
Hi Mike,
It could be hardware problem. Try looking at the file by issuing this command:
"sh file systems" under the flag section, does it say "r" or "rw"?
HTH
ā05-23-2017 04:56 PM
Did you try to DOWNGRADE the IOS of the switch when this happens? There is an IOS bug affecting a large quantity of 3850. These switches are shipped with Denali and they will go into ROMmon when they are downgraded to 3.6.X and (earlier). The switch, however, will boot 3.7.X properly.
ā05-24-2017 04:53 AM
Hi Leo,
Not sure what happened before I got hold of it, but I tried with Release Denali-16.3.1 16.03.01a
the firmware was upgraded then I got these messages and the box reboots.
ā05-24-2017 06:11 PM
Mike,
Please console into the switch and reboot. We want to see what the switch is doing and where it's failing.
ā05-25-2017 05:31 AM
Hi Leo,
This is an example using the last IOS.
ā07-31-2018 02:41 PM
I see the similar thing on my switch, and I don't have any further information than what is posted here. Was there ever a fix to this?
Thank you
J
ā08-14-2018 10:28 PM
Did anyone find a solution to this problem ?. I tried many methods to solve this but it didn`t work. And I don know why it booted one time from usb successfully but after reload I couldn`t boot from usb again facing the same problem mentioned above.
ā09-21-2018 11:03 AM
once you boot from usb or tftp you are supposed to copy the file into flash and fix the problem from there, booting from usb or tftp is only to get you into the switch so you can copy the necessary files etc
ā10-28-2018 07:44 PM
I thought I'd share the solution I found to this issue - copy the binary to a usbkey and slot it into the front panel USB port.
At the ROMMON switch: prompt issue the command:
switch: boot usbflash0:cat3k_caa-universalk9.SPA.03.06.06.E.152-2.E6.bin
(replace cat3k_caa-universalk9.SPA.03.06.06.E.152-2.E6.bin with the name of your binary)
Once the switch has booted, copy the binary to flash
Switch# copy usbflash0:cat3k_caa-universalk9.SPA.03.06.06.E.152-2.E6.bin flash:
Don't forget to set the boot image
Switch# conf t
Switch(config)# boot system flash:cat3k_caa-universalk9.SPA.03.06.06.E.152-2.E6.bin
hopefully this will solve the issue
ā12-21-2019 04:45 AM
ā03-03-2020 08:34 AM
I'm a little late but I recently ran into the same issue and was able to resolve it. I had to download the .bin file to a usb and then while in rommon mode confirm the .bin file is showing on the usb, dir usbflash0:
then use the command emergency-install usbflash0:/cat3k_caa-universalk9.16.03.09.SPA.bin or whatever .bin file you're using and it will override the current flash and delete everything not being used. Just be sure to update your boot var to package.conf once it's booted up and you should be good!
ā04-02-2020 01:24 PM
I've had the same problems as above. Basically can't copy a new IOS into flash:. I've booted from USB and toward the end of the process the switch reboots and comes up with nothing in flash or misconfigured. Back to Switch: prompt. Will try the emergency install but can't copy from xmodem, usbflash0, or SCP without the read only error. Checked and all files in Flash: are RW.
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