IEEE 802.1CB-2017 PDF
This standard specifies procedures, managed objects, and protocols for bridges and end systems that provide identification and replication of packets for redundant transmission, identification of duplicate packets, and elimination of duplicate packets. It is not concerned with the creation of the multiple paths over which the duplicates are transmitted.
The reason for Frame Replication and Elimination for Reliability (FRER) is to increase the probability that a given packet will be delivered. It is expected that, in many applications, other means to increase the probability of delivery are likely to be used, as well. When FRER is used over paths that are fixed to a specific topology, and that are protected against congestion loss (e.g. by using techniques described by IEEE Std 802.1BA [B1]), FRER can substantially reduce the probability of packet loss due to equipment failures.
New IEEE Standard – Active. This standard specifies procedures, managed objects, and protocols for bridges and end systems that provide identification and replication of packets for redundant transmission, identification of duplicate packets, and elimination of duplicate packets. It is not concerned with the creation of the multiple paths over which the duplicates are transmitted.
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