03-11-2022 05:15 AM
Hi,
I still believe downgrading Expressway's is still not supported. Customer wants a rollback plan for upgrade - is the only supported method to restore the cluster from backup?
Anyone had to do this? Or has anything actually "downgraded" their Expressway successfully ?
Thanks
Solved! Go to Solution.
03-11-2022 11:43 AM - edited 03-11-2022 11:51 AM
Hi,
It works from first VCS releases, i thought it was well-known...
Two methods:
1) Reboot Expressway > stop boot script with ctlr-c and select alternate image from GRUB for continue boot
2) Login by root and type selectsw and you can see which image using now.
Then type selectsw1 or selectsw2 for choose image after reboot:
selectsw1- first image
selectsw2 -second image
reboot
I don't check downgrade from 14x to 12.6.4 .
Do you read release notes info about downgrade ?
You can simple and quick test such downgrade in lab. I think all will be Ok with downgrade.
BR Oleksandr
03-14-2022 11:16 AM
Hi ,
You can find this info on https://www.ciscolive.com/ in on-demand section in lections about troubleshooting VCS or Expressway.
BR Oleksandr
04-04-2022 07:10 AM
For anyone else reference the command to switch is selectsw 1 or 2, so selectsw, space, 1 or 2. Otherwise you'll get an error for command not found.
03-11-2022 06:15 AM - edited 03-11-2022 06:16 AM
Hi,
Every Expressway, can have two image onboard. And if your upgrade fail , you can use second image. After upgrade you can use first or second image. Use root login.
Greenfield installation has one image.
If you use greenfield Expressway 14x, you can't downgrade to Expressway 12x.
What Expressway version you use and to what version you want to upgrade ? All info in Release Notes.
BR Oleksandr
03-11-2022 06:29 AM
Interesting. ':-)'
How do you actually switch between the two images?
03-11-2022 06:47 AM
Hi there,
I've never head of that. How do you switch?
Going from X12.6.4 to X14.0.5
Russell
03-11-2022 11:43 AM - edited 03-11-2022 11:51 AM
Hi,
It works from first VCS releases, i thought it was well-known...
Two methods:
1) Reboot Expressway > stop boot script with ctlr-c and select alternate image from GRUB for continue boot
2) Login by root and type selectsw and you can see which image using now.
Then type selectsw1 or selectsw2 for choose image after reboot:
selectsw1- first image
selectsw2 -second image
reboot
I don't check downgrade from 14x to 12.6.4 .
Do you read release notes info about downgrade ?
You can simple and quick test such downgrade in lab. I think all will be Ok with downgrade.
BR Oleksandr
03-14-2022 09:59 AM
Hi,
This is excellent information but I do not see it mentioned anywhere in Cisco documentation......which is crazy really if it works because trying to tell a customer that the only rollback is rebuilding it from backup is not going down too well!!
03-14-2022 11:16 AM
Hi ,
You can find this info on https://www.ciscolive.com/ in on-demand section in lections about troubleshooting VCS or Expressway.
BR Oleksandr
04-04-2022 07:10 AM
For anyone else reference the command to switch is selectsw 1 or 2, so selectsw, space, 1 or 2. Otherwise you'll get an error for command not found.
10-15-2023 08:16 PM
Hi Oleksander,
Great stuff, I found the same thing in the x14.0 Upgrade guide.
A question though, I am about to upgrade 14.2.6 to 14.3.1, everything is in order for the upgrade so okay with that part.
In case I have to roll back, all I would need to do is log in to the Expressway E&C as root and switch to the old image and reboot.
would I need to upload the backup i did in GUI as well? as nothing would be changed from the config perspective?
Thanks
10-15-2023 10:11 PM - edited 10-15-2023 10:11 PM
No need to do anything else than just the switch of version. The configuration stays the same, so no need to restore any backup.
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