Publication type: Conference paper
Type of review: Peer review (publication)
Title: Ethernet redundancy with zero switchover time
Authors : Weibel, Hans
Conference details: Embedded World Conference, Nuremberg, Germany, 28 February - 1 March 2012
Issue Date: 2012
Language : English
Subjects : Industrial Ethernet; High-availability Networks; Parallel Redundancy Protocol; High-availability Seamless Redundancy
Subject (DDC) : 004: Computer science
Abstract: Redundancy protocols help to improve the availability of a network. Such protocols typically perform a reconfiguration of the network after a failure of a node or a link, i.e. a new network topology is computed and activated. Applications can’t communicate during this reconfiguration for several ten or hundred milliseconds, depending on the type of protocol and on the size and topology of the network. Demanding applications in the field of automation, transportation, and power distribution require mechanisms free of interruption, i.e. qualified as “with zero switchover time” or “bumpless”. An approach to realize bumpless redundancy is to transmit multiple copies of a frame over different independent paths at the same time. The receiver processes the copy arriving first and discards the duplicates. The standard IEC 62439-3 specifies two protocols based on this principle: the Parallel Redundancy Protocol (PRP) uses two independent LANs while the High-availability Seamless Redundancy (HSR) Protocol uses the two disjoint paths offered by a ring. The paper discusses the concept and characteristics of PRP and HSR as well as various implementation aspects and options.
Fulltext version : Published version
License (according to publishing contract) : Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Embedded Systems (InES)
Appears in Collections:Publikationen School of Engineering

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