Re: which Junos for my EX4200

Hi,

Please check the list of supported releases:

https://pathfinder.juniper.net/home/#EX4200/Supported+Releases

15.1R4 does not seem to be in the list yet. Latest version: 15.1R3

Safest might be the JTAC recommended version unless some new functionality is being required not available in the JTAC recommended version. This can be verified:

https://pathfinder.juniper.net/home/#EX4200/Features/Junos OS/15.1R3

Cheers,

Ashvin