Hi all,
This is a dissector for the Parallel Redundancy
Protocol (PRP) defined in chapter 6 of the IEC 62439.
PRP uses two independent networks in parallel and
allows redundancy without switchovers.
The protocol is sending Mac multicast messages with Ethertype
0x88fb. In addition to that it adds to every Ethernet frame a 4 byte trailer
before the FCS. The trailer is detected by checking a size field and an
identifier which are part of the trailer. Therefore, if the last 4 bytes of a
frame match a correct trailer they get interpreted as a trailer, although it
was probably not a real one.
Best regards
Sven
Meier
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/// Sven Meier
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Dipl.Ing. FH Informationstechnologie
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Entwicklungsingenieur IEEE 1588
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Embedded Systems
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Room InES TW 220
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