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In my view best stability, used by most people (all of my customers are on 12.3 
only), and no feature set differences. When 15.1 came out initially there were 
some concerns, so IMHO most just stayed on 12.3 once it was announced to have 
continued support.

Just my 2 cents worth.

Sent from my iPhone

On Oct 17, 2019, at 12:01 AM, Josh Baird <joshba...@gmail.com> wrote:


Thanks, Richard.  Any particular reason why I would be better off using 12.3R12?

On Wed, Oct 16, 2019 at 5:53 PM Richard McGovern 
<rmcgov...@juniper.net<mailto:rmcgov...@juniper.net>> wrote:
No.  For legacy EX switches, for which EX4500/EX4550 fall into, 15.1 is last 
release.  At the same time, I think you might have best results using 
12.3R12-S[latest] instead.  Both 12.3 and 15.1 will be maintained for life of 
legacy EX switches.

HTH, Rich

Richard McGovern
Sr Sales Engineer, Juniper Networks
978-618-3342

I’d rather be lucky than good, as I know I am not good
I don’t make the news, I just report it


On 10/16/19, 1:50 PM, "Josh Baird" 
<joshba...@gmail.com<mailto:joshba...@gmail.com>> wrote:

    Is it possible (and recommended) to run anything newer than 15.1 on EX4550
    (which is what the JTAC-recommended version currently is).




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