Bandwidth Reservation Method to Consider Reservation Failure in VLAN

A number of research efforts are made for transmission of real-time traffic over the Ethernet network because of growth of digital media devices. Standardizations of network techniques for real-time traffic over Ethernet are in progress in IEEE 802.1 AVB TG. In this paper, Active MSRP which is based on IEEE 802.1Qat-a bandwidth reservation method-was proposed. In various reservation scenarios, Active MSRP processes a procedure of bandwidth reservation failure for time sensitive traffic. If reservation failure is occurred at node or bridge, active MSRP sends reservation failed messages to other nodes and bridges. Those nodes and bridges which received reservation failed messages release a bandwidth of prepared service and withdraw reservation information of the service. Active MSRP releases a bandwidth adaptively so that it is more efficient for network utilization than IEEE 802.1Qat. Active MSRP was compared with IEEE 802.1Qat through OPNET network simulation tool.