The desc explicitly states this is 'Planned for future use only - currently should have the constant value of 4', meaning the vendor's own documentation flags this field as not yet implemented. Because Check Point explicitly documents this as reserved for future use, any value other than the constant 4 on a current software build would indicate an unusual version or a MIB compatibility issue rather than telling you anything real about network topology today. e.g. you should expect to see the literal value 4 on every interface row today, regardless of whether that interface is internal, external, or DMZ-facing.