A system and method of providing a quality of service (QoS) is provided. The method of providing the QoS in the link layer includes receiving, by a stream providing device, minimum and maximum resource requirement information of a stream receiving device; transmitting, by the stream providing device, a reservation message including the minimum and maximum resource requirement information; allocating a resource, by at least one bridge, based on the reservation message transmitted from the stream providing device; and receiving, by the stream receiving device, a stream transmitted from the stream providing device via the resource.