[j-nsp] In-service security upgrade ?

[Alexandre Snarskii]

Hi!

Yesterday there were some security-related technical bulletins
published by Juniper. Well, I like that some bugs were fixed,
but I personally hate the idea that I have to reboot routers and
switches to fix bug in ntpd (for example). 

That's why this question arises: did anyone tried the "hard way"
of upgrading one device, taking fixed ntpd (or whatever) from it 
and distributing it over all other devices without having to reboot 
them ? Or software signatures will prevent code compiled for some 
specific version to run on other version ? Even in "minor version 
change" cases like 9.3S<smth> code vs. 9.3R<smth> kernel ?