05-04-2017 10:16 AM - edited 03-08-2019 10:26 AM
Hello,
I have 3850 stackable switches and reboot them to load into the new IOS, but say the IOS fails to boot to the new IOS does it automatically boot from previous IOS or do I have to go rommon mode?
05-04-2017 10:22 AM
Have you set the boot statement?
boot system flash:/ios_file.name
05-04-2017 10:24 AM
Yes I did, is there a way to configured the switch to boot from the second IOS incase the first IOS doesn't boot up or will it do it automatically?
05-04-2017 10:33 AM
It will do that automatically. If you type 'show run | i boot' does it show only the new IOS image or both?
05-04-2017 10:54 AM
It doesn't show anything, do I need to configure with the boot system flash:/ios_file.name command?
05-04-2017 11:03 AM
try
show bootvar or
sh boot system
---------------------------
Switch 1
---------------------------
Current Boot Variables:
BOOT variable does not exist
Boot Variables on next reload:
BOOT variable = flash:packages.conf
Allow Dev Key = yes
Manual Boot = no
Enable Break = no
Above is from one of my 3850
05-04-2017 01:04 PM
If you have more than IOS image in flash then you need to specify which one to boot. If it fails to load that image it will search flash for another image and try and boot with that. You only need the one boot statement.
05-04-2017 11:04 AM
It doesn't have the boot system flash command configured. do I have to configure the boot flash command twice such as do the boot flash: ios1 and then boot flash:ios2 for the switch to automatically load to ios2 in case ios1 doesn't work or do I need to configure only once boot flash: ios1 no need for boot flash:ios2?
Thanks,
05-04-2017 10:38 AM
Hi
Sometimes you need to remove the old boot system flash and then configure the new one:
no boot system flash:/ios_file.name
boot system flash:/ios_file.name
then
write
to save the changes.
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