Abstract
High availability is crucial for industrial Ethernet networks as well as Ethernet-based control systems such as automation networks and substation automation systems (SAS). Since standard Ethernet does not support fault tolerance capability, the high availability of Ethernet networks can be increased by using redundancy protocols. Various redundancy protocols for Ethernet networks have been developed and standardized, such as rapid spanning tree protocol (RSTP), media redundancy protocol (MRP), parallel redundancy protocol (PRP), high-availability seamless redundancy (HSR) and others. RSTP and MRP have switchover delay drawbacks. PRP provides zero recovery time, but requires a duplicate network infrastructure. HSR operation is similar to PRP, but HSR uses a single network. However, the standard HSR protocol is mainly applied to ring-based topologies and generates excessively unnecessary redundant traffic in the network. In this paper, we develop a new switching node for the HSR protocol, called SwitchBox, which is used in HSR networks in order to support any network topology and significantly reduce redundant network traffic, including unicast, multicast and broadcast traffic, compared with standard HSR. By using the SwitchBox, HSR not only provides seamless communications with zero switchover time in case of failure, but it is also easily applied to any network topology and significantly reduces unnecessary redundant traffic in HSR networks.
Highlights
High seamless communication with fault tolerance is one of the key requirements for Ethernet-based, mission-critical and real-time systems such as substation automation systems (SAS), automation networks and other industrial Ethernet networks
Unlike standard high-availability seamless redundancy (HSR), which duplicates and circulates unicast traffic frames in all rings, SwitchBox-based HSR does not forward the unicast traffic frames to Doubly attached node for HSR (DANH) rings that do not contain the destination of the frames
SwitchBox-based HSR significantly reduces network traffic compared with the standard HSR
Summary
High seamless communication with fault tolerance is one of the key requirements for Ethernet-based, mission-critical and real-time systems such as substation automation systems (SAS), automation networks and other industrial Ethernet networks. The PRP and HSR protocols are suitable for seamless communications Both the HSR and the PRP are based upon the principle of providing duplicated frames for separate physical paths with zero recovery time [8,12]. HSR is a redundancy protocol for Ethernet that provides zero recovery time in a case of the failure of one component. Unlike the mentioned approaches, which propose algorithms implemented in existing HSR components to improve the network traffic performance in HSR networks, in this paper, we develop a new HSR component, called the HSR switching node (SwitchBox), to apply HSR to any network topology as well as significantly reduce unnecessary redundant network traffic compared to the standard HSR.
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