SD-WAN Support Forward Error Correction (FEC)
Forward Error Correction (FEC) is a mechanism to recover lost packets on a link by sending extra “parity” packets for every group (N) of packets.
Forward Error Correction (FEC) is a technology that is well known for its ability to correct bit errors at the
physical layer. However, this technology can also be adapted to operate on packets at the network layer to improve
application performance across WANs that have high-loss characteristics. With packet-level FEC, network equipment
can reconstitute lost packets at the far end of a WAN link, avoiding delays that come with multiple round-trips
retransmissions. This enables WANs to easily recover from packet loss due to a variety of network layer conditions,
such as queue overflows and constrained bandwidth links. With packet-level FEC, enterprises commonly see significant
improvements in application performance — up to a 10-fold performance increase in some WAN environments.