Quick removing (QR) approach using cut-through switching mode

Abstract

We previously introduced a quick removing (QR) approach to improve the high-availability seamless redundancy (HSR) protocol's traffic performance. The idea of the QR approach is to remove the duplicated frame copies from the network when all the nodes have received one copy of the sent frame and begin to receive the second copy. Therefore, the forwarding of those frame copies until they reach the source node, as occurs in standard HSR, is not needed in QR. In our earlier paper, we adopted the store and forward switching mode, whereas in this paper, we present the HSR node's behavior and the QR approach performance using a cut-through switching mode. The performance analysis shows a reduction percentage in frame latency that reaches about 49% compared to the store and forward switching mode. Consequently, this will improve network performance, free more bandwidth, and deliver sent frames quickly to their required destinations, which is a firm condition in many industrial and automation applications.