"Tyler Durden: "Now as a question of etiquette"".... iPXE dedicated vlan, or mixed?

Out of curiosity, and function, those of you whom run iPXE for installers, or ram resident... do you run iPXE on a native vlan and then have your o/s attach to a tagged vlan, or do you run both iPXE and system mgmt in one vlan? This question brought to you by: "WHY THE F*** WONT YOU BOOT FROM USB!?!?!?!"