Hi all. Currently I'm in the process of upgrading EX3300/4300/4600 switches(some in virtual chassis) to new Junos OS listed in the download section.
Most of the switches haven't been upgraded in a few years so they have out of date Junos OS on them. I was wondering if I can upgrade immediately to the latest release or do I need to use incremental updates?
For example if I have an EX4300 virtual chassis with Junos OS 14.1X53 can I go straight to Junos OS 20.1/2 or do I need to do incremental upgrades to the release I want?
Thanks in advance for all the help.
there are lots of threads within the J-Net forum with the identical question. E.g. here:
Also please check the recommended firmware page for each device, as the latest and greatest releases (currently 19.4 - 20.3) could have some stability issues:
You cannot upgrade skipping more than 3 mayor releases for example from version 14 over to 18 directly. For example you can follow the following upgrade path:
The other alternative, if you want to upgrade directly is with a format install:
Take in consideration that 20.X is not a stable version for the moment. I suggest to check the following document: https://kb.juniper.net/InfoCenter/index?page=content&id=KB21476
Thanks to both of you for the responses. I will use the upgrade path you suggested to the version 18.X.
I would suggest not skipping version 15. I think that's when FreeBSD was upgraded.
Last attempt - step not needed. With direct you'll get FreeBSD upgrade as well.
Additional info here regarding FreeBSD upgrade (and potential need for downgrade). This still calls out old multi-step stuff 😩. Best is to NOT use validate option or specify no-validate explicitly (I have never needed this):
Also see this KB - https://kb.juniper.net/InfoCenter/index?page=content&id=KB31903&cat=EX4300_1&actp=LIST&showDraft=false
Just to be clear after all this. The upgrade path should be:
1. upgrade to 15.1 -> this step will also upgrade FreeBSD
2. upgrade to 17.1
3. upgrade to 18.X -> I will go for last minor release within this major release
Will this cover all of the potential pitfalls for upgrades?