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- Forward Error Correction (FEC) is a mechanism to recover lost packets on a link by sending extra “parity” packets for every group of 4 packets. As long as the receiver receives a subset of packets in the group (at-least N-1) and the parity packet, up to a single lost packet in the group can be recovered.
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What is packet-level forward error correction (FEC)?
What is forward error correction (FEC)?
How does BIG-IP perform forward error correction (FEC)?
How does packet-level FEC affect packet loss rates?
Oct 29, 2020 · SD-WAN improves the performance and reliability of IP networks, and one of the techniques it employs is Forward Error Correction (FEC). This blog post explains how FEC works and describes how leading SD-WAN platforms utilize it to mitigate packet loss. We begin with a reminder: packet delivery on IP networks is best effort, not guaranteed.
For example, with 2% loss, the file transfer takes 101 seconds without FEC and 28 seconds with FEC, almost a four-fold improvement. At 5% loss, the file transfer takes 69 seconds with FEC enabled. This is less than the 72 seconds it takes to transfer the same file with a 1% packet-loss rate and no FEC.
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These technologies use well established, link-layer techniques to deliver error-free, well-formed Protocol Data Units (PDUs) to upper layers. However, different network-layer characteristics result in unique packet delivery behavior across these technologies. Download File: silver-peak_wp_fec.pdf.
Overview: Using forward error correction (FEC) to mitigate packet loss. The BIG-IP system performs forward error correction (FEC) by adding redundancy to the transmitted information. FEC provides a loss correction facility for all IP-based protocols optimized by Application Acceleration Manager.
Forward Error Correction (FEC) is a mechanism to recover lost packets on a link by sending extra “parity” packets for every group of 4 packets. As long as the receiver receives a subset of packets in the group (at-least N-1) and the parity packet, up to a single lost packet in the group can be recovered.
FEC can be applied only to streams that are sensitive to packet loss. For Example, policies that allow the UDP based VoIP protocol can enable FEC, while TCP based traffic policies do not. This reduces unnecessary bandwidth consumption by FEC.
In this article, we extend QUIC by enabling it to rely on Forward Erasure Correction (FEC) to recover from packet losses. This design is motivated by high Bandwidth-Delay Product (BDP) networks such as In-Flight Communication (IFC) services where losses are frequent and retransmissions impact user experience [11].
