This object is a writable bitmask indicating which Layer 3 slots participate in BOFL (break-out-of-forwarding-loop) checks for a valid DPI path from the primary SSP, defaulting to 0. Admins set bits here to exclude specific Layer 3 slots from BOFL checking, such as when a module doesn't support or need this validation. For example, an admin with a specialized Layer 3 module that doesn't require BOFL checking would set that slot's bit in this mask to exclude it.