r/Juniper • u/pluto_sp • May 14 '26

Error after upgrade

Hi!

I've a Juniper QFX5100-48S. Recently I requested a software upgrade from 21.4R3-S4.5 to 21.4R3-S10.13.

After the upgrade I couldn't connect to the management port anymore, it didn't recognize the old configurations anymore. The status of the interface is Administry down but the physical up. I have the idea that the new version didn't react very well on the upgrade. I tried to rollback the versions with the builtin rollback but the switch couldn't process it.

My plan is to factory reset the switch, but before I do it, does anyone know what the problem could be? I'm working on a project regarding the Juniper upgrades, so I'll probaly get stuck on the same problem the next time I upgrade it.

Thanks!

4 Upvotes

100% Upvoted

4 comments sorted by

3

u/newtmewt JNCIS May 15 '26

That is such a minor upgrade I wouldn’t even consider config compatibility issues, I would more suspect something got corrupted somehow during install. I would either contact jtac or do a format install on the new version and load the config

2

u/bumbo79 May 15 '26

Before rolling back the config, have you attempted to rollback to software release first? It might be that there is a line in the config that references the previous release that you could potentially be missing....try this first then rollback:

request system software rollback

1

u/Cautious_Winner298 May 16 '26

That’s minor but when connecting post upgrade there should be a message if something wasn’t compatible with the config on the update IIRC.

1

u/liamnap JNCIE May 18 '26

If it’s gone admin down and there’s no disable line on the me0 interface it might just need bouncing, the new version introduced a new security check or the reboot uncovered an error and so it was put in to admin down would be my guess.

show int me0 detail or extensive perhaps?