A comparison study of the quick removing (QR) approach (HSR mode X) under cut-through and store and forward switching modes

• Published in: 2017 19th International Conference on Advanced Communication Technology (ICACT) pp. 895 - 901
• Main Authors: Nsaif, Saad Allawi, Semog Kim, Jong Myung Rhee
• Format: Conference Proceeding
• Language: English
• Published: Global IT Research Institute - GiRI 2017
• Subjects: cut-through; HSR Mode X; HSR protocol; HSR traffic performance; IEC 62439-3; IEC Standards; Ports (Computers); Protocols; QR approach; Redundancy; seamless redundancy; Switches
• DOI: 10.23919/ICACT.2017.7890241

We previously introduced a quick removing (QR) approach (currently part of the IEC 62439-3 standard under the terminology of "HSR Mode X") 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 nodes have received one copy of the sent frame and begin to receive the second copy. Therefore, forwarding the frame copies until they reach the source node, as occurs in a standard HSR, is not needed in a QR. In our previous paper, we applied the store and forward switching mode, whereas in this paper, we present the performance of the QR approach using a cut-through switching mode. The performance analysis showed 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 quickly deliver sent frames to their required destinations, which is a firm condition in many industrial and automation applications.