A Scalable Architecture for High Availability Seamless Redundancy (HSR)
James T. Yu · 2017
Ethernet is being expanded to many industrial automation applications, and the demand for high availability drives the adoption of High Availability Seamless Redundancy (HSR) due to its capability to achieve zero recovery time. A major challenge of HSR is long delay of large HSR network due to its ring architecture. A solution to this issue is to use QuadBox to design multiple rings which raise many design questions because of different architecture options. Our approach is to apply the concept of SS7 signaling to classify the links as A, B, C, and D from which we present a flexible and scalable architecture. We developed a simulation model to validate this architecture, and the results show that one-way delay is not negatively affected by network growth. Another contribution of this paper is to use a central controller, like Software Defined Network (SDN), to create MAC forwarding tables on individual HSR nodes. The proposed scheme prevents flooding and broadcast storm in this loop topology.