This read-only value shows whether a VLAN termination subinterface uses strict(0) or loose(1) matching when receiving and terminating packets carrying two or more layers of VLAN tags. Admins use it to see whether the subinterface requires an exact tag match (strict) or tolerates additional/variable inner tagging (loose) for the traffic it terminates. For example, a subinterface configured as loose(1) would accept double-tagged frames even when the inner tag varies, while strict(0) would require it to match exactly.