Re: What is the difference between Perpetual and Subscription Licensing?
Assuming you mean SPACE here.
It's just CAPEX vs. OPEX, giving customers another choice through a Juniper SKU.
In my practice, I sell SPACE only for EX today. When I do, I choose perpetual licensing. If customers need OPEX, I finance through our internal financing dept, and give them a monthly cost - actually in that case for the whole deal, switches and management and power/cooling and anything else they might need on the project.
YMMV, depending on whether you have a financing dept (or a partner who does), whether you need OPEX just on SPACE or on the devices / labor that SPACE manages as well, &c.