ACI Leaf Boot Loop After Software Downgrade But Succeed on a Spine

[zhdprime]

Step 1.To add our existing ACI environment we have to downgrade Leaf from version 15.2.8d to 15.2.7f then i will add ACI environment but So as per cisco document i used below command :

(none)# touch /tmp/install_in_progress

(none)# copy usb/usb1/aci-n9000-dk9.15.2.7f.bin bootflash/

(none)# setup-bootvars.sh aci-n9000-dk9.15.2.7f.bin

(none)# cat /mnt/cfg/0/boot/grub/menu.lst.local           
boot aci-n9000-dk9.15.2.7f.bin
(none)# cat /mnt/cfg/1/boot/grub/menu.lst.local
       boot aci-n9000-dk9.15.2.7f.bin
This command will reload the chassis, Proceed (y/n)? [n]: y

but after reboot it didn't booting up properly it's booting and booting why ? did i mistake to add any command ? and also i saw iso is already in dir bootflash/ and also informed that i kickout usb after reboot few times.

Step 2. Then i took help from TAC enginner then they provide me few command to use in boot loader mode then it works. below command i use and i used here usb pendrive

loader > dir

usb1::
System Volume Information
aci-n9000-dk9.15.2.7f.bin

bootflash::

mem_log.txt.old.gz
auto-s
mts_buffer_log.log
CpuUsage.Log
lxc
.rpmstore
disk_log.txt
bfd_lib_1.dbg
libmon.logs
lost+found
zl303xx_fw_upgrade.log
aci-n9000-dk9.15.2.7f.bin
bios_bootup_scratch_not_cleared

loader > cmdline recoverymode =1

loader > cmdline init_system

loader > cmdline clear_config

loader > cmdline clear_log

loader > boot usb1:aci-n9000-dk9.15.2.7f.bin

Security Lock
Booting usb1:aci-n9000-dk9.15.2.7f.bin
Trying diskboot
Filesystem type is fat, partition type 0x83
Image valid

Image Signature verification was Successful.

User Access Verification
(none) login: admin

(none)# setup-bootvars.sh aci-n9000-dk9.15.2.7f.bin
In progress
In progress
In progress
In progress
In progress
In progress
In progress
In progress
In progress
In progress
In progress
Done
(none)#

>> Final query that why step 01 wasn't worked for Leaf switches and also informed that i have applied this iso on SPINE Switchs but got ok. is there any differnece between spine and leaf ?

>> after reboot it didn't booting up properly it's booting and booting why ? did i mistake to add any command ? and also i saw iso is already in dir bootflash/ and also informed that i kickout usb after reboot few times.

BR

ZHD27

[julian.bendix]

I actually always do it like Step 2... just a bit simpler. I always simply break into bootloader, copy the image I need from a USB Drive and boot it .. without all the other fuzz. And it worked everytime so far.

As to what happened during your Step 1... the only thing I can think of is that the agressive bootflash cleanup script on ACI Leaves has deleted the file.

[zhdprime]

Thanks.

For step 02 >> should i use all below command or not ? if not then which is recommeded to use. here is command

loader > cmdline recoverymode =1

loader > cmdline init_system

loader > cmdline clear_config

loader > cmdline clear_log

For Step 02 >> you have mentioned agressive bootflash cleanup script but does leaf will automatically remove or should i use any wrong command ?

BR

zhd27

[julian.bendix]

Not sure about recommended or best practice ways.. I can just tell you how I have been doing that successfully for years now.
I always simply break to bootloader, copy image from usb to flash, then boot - no more and no less.

Hope that helps!

BR Jules

[julian.bendix]

All good?