Upgrading big3d to rel 15.1.x in legacy platforms

Hi

I just wanted to get feedback in case anyone had already tested with and scenario where all the GM (DNS) layer is already in rel 15.1.x which has to be interfaced to legacy LTM boxes running BIG-IP rel 12.1.x.

I such a deployment, big3d at LTM devices should be upgraded to same or higher version than the GTM devices.

Anybody knowns any issues I should be expecting?

Many thanks