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parallel redundancy protocol (PRP)

Parallel Redundancy Protocol (PRP) is a redundancy protocol with which the redundancy of industrial networks such as Industrial Ethernet is established and the reliability is increased. The protocol, which is standardized under IEC 62439-3, is designed so that a network fault does not affect data transmission.

Conceptually, PRP networks operate with highly available network nodes, each equipped with two Ethernet ports and connected to two different local networks. The two networks are redundant in that they are completely separate and not interconnected. Data traffic runs on both networks. The redundancy procedure runs on the Medium Access Control( MAC) and uses the same MAC address on both networks.

The network node sends copies of the frames on both ports simultaneously. The destination node, to which both frames are sent, accepts the first error-free frame and discards the second. The PRP redundancy protocol usually works together with High Availability Seamless Redundancy( HSR).

Englisch: parallel redundancy protocol - PRP
Updated at: 21.11.2015
#Words: 149
Links: redundancy, protocol, Ethernet, reliability, international electrotechnical commission (IEC)
Translations: DE

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