Redundancy enhancements for Industrial Ethernet ring protocols (original) (raw)
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Automatic device configuration for Ethernet ring redundancy protocols
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In modern communication systems based on Ethernet technology, the use of physical ring structures and ring redundancy protocols has been common for some time in the past. A challenge remains the configuration of such a redundancy protocol on each device with the networks stretching out over large areas, like in offshore wind power stations, where each windmill houses at least one Ethernet switch. The distance between windmills can be several kilometers and configuration of the redundancy protocol on each device is an elaborate process. In this paper, a mechanism is proposed which automatizes the configuration of ring redundancy protocols and eliminates the need to configure each device separately. The actual protocol implementation is intended to be part of the next major software release of Hirschmann Industrial Ethernet Switches.
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IEEE Communications Letters, 2011
Ring-based industrial networks must possess a fast recovery algorithm when either the switch node or link is faulty. This work presents a simple yet extremely fast recovery algorithm based on the last-in-backup (LIB) concept, in which the final link added to the ring is the backup link. Analysis results indicate the proposed LIB algorithm performs significantly better than the MRP protocol developed in the latest version of the IEC 62439 standard. The proposed LIB algorithm is implemented in industrial Ethernet switches as well. Our results further demonstrate that the proposed recovery algorithm is extremely feasible with a link-down recovery time of 5.5ms for 50 switches and 6.5ms for 250 switches.
Selecting a Standard Redundancy Method for Highly Available Industrial Networks
2006 IEEE International Workshop on Factory Communication Systems, 2006
Availability of Industrial Ethernet networks can be increased by providing redundant links and nodes. Although many specifications of Industrial Ethernet have been submitted to the International Electrotechnical Committee (IEC), they do not disclose methods to implement network redundancy. A working group of the IEC will, as part of the fieldbus maintenance team, issue guidelines for implementing redundancy in switched networks. Since the redundancy is dictated by the plant and less by the network, several solutions are studied. While less time critical processes can be satisfied by a standby solution with alternate links, hard real time systems require a full duplication and parallel operation of redundancy. Both methods can be combined to increase further availability. Network safety or security is not considered here.
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Ethernet networks are increasingly used for protection and high-speed automation as part of the trend to combine all substation communications onto a single shared network. A primary question now is how do we ensure the dependability and security of these applications when using Ethernet for signaling? There are several mechanisms available to deal with different communications network failure scenarios. This paper compares and contrasts the following methods and their abilities to satisfy performance requirements expected for protection and high-speed automation: • Classic dual-primary architectures. • Spanning tree algorithms (Spanning Tree Protocol/Rapid Spanning Tree Protocol). • Parallel Redundancy Protocol. • High-Availability Seamless Redundancy. • Software-defined networking. Specifically, this paper addresses how each failure-handling method works and selection criteria for determining the failure-handling method to apply given the particular objectives of the protection or...
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Ethernet is becoming increasingly popular in metro and carrier-grade networks because of its cost-effectiveness, simplicity and scalability. Nevertheless, Ethernet was originally designed as a LAN technology, therefore, it lacks some features, such as fast fault-protection and sophisticated management, which are very important in the new carrier-grade application areas. We propose a simple failure protection mechanism for Ethernet networks that can recover from node and link failures under 50 milliseconds, which is also provided by SDH/Sonet rings. The mechanism relies on a lightweight distributed protocol that runs on IP routers at the edges of the network and works with commodity off-the-shelf Ethernet switches. This paper describes the protocol design and implementation as well as the network testbed implementation for assessing the performance and the robustness of the mechanism. The results collected in the testbed are shown and discussed in the paper.
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The “Parallel Redundancy Protocol” (PRP) according to IEC 62439-3 realizes active network redundancy by packet duplication over two independent networks that operate in parallel. It has been specifically designed for industrial networks to meet highest availability requirements. In case of a single network failure, seamless redundancy is provided for data communication between PRP nodes that are connected to both networks. However, PRP was designed as a layer 2 Ethernet protocol that is transparent to higher protocol layers. In its current version, PRP is not able to support IP routing. This is because an IP router would change the source MAC address field of the Ethernet header which is used by a PRP receiver node for duplicate detection. In this work we propose and discuss a novel approach that keeps the PRP duplicate identification information across IP router boundaries.
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In choosing a network service technology, a subscriber considers many features such as latency, jitter, packet loss, security, and availability. The most important feature, and usually the one that determines the final selection, is the service availability. In this article, a full spectrum of applications are studied, ranging from the minimal constraints of home networks to the rigorous demands of Industrial Ethernet Networks. This is followed by a thorough examination of Ethernet layer resilience technologies. This paper provides the resilience characteristics that are key for each class of application Ó
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Fast and deterministic Ethernet packet delivery is required to transfer digital signals used within communicationsassisted automation and protection logic. Reliable transfer of digital signals from source to destination intelligent electronic devices (IEDs) permits logic to react faster, be more selective and discrete, and perform self-tests. The status and command signals must be received at the remote IED in the shortest possible time, and interference on the communications channel must never cause unwanted operation of the logic. Ethernet networks are increasingly used to transfer protection and high-speed automation messages, as well as supervisory control and data acquisition (SCADA), engineering access, and metering messages as part of the trend to combine all substation communications onto a single shared network. An increasingly difficult and critical design engineering challenge is choosing Ethernet methods that ensure the dependability and security of these applications. T...
Network Management Software for Redundant Ethernet Ring
Theoretical & Applied Science
ISRA (India) = 1.344 ISI (Dubai, UAE) = 0.829 GIF (Australia) = 0.564 JIF = 1.500 SIS (USA) = 0.912 РИНЦ (Russia) = 0.234 ESJI (KZ) = 3.860 SJIF (Morocco) = 2.031 ICV (Poland) = 6.630 PIF (India) = 1.940 IBI (India) = 4.260