From the course: Implementing Cisco Software-Defined Wan (SD-WAN) for your Enterprise and Cloud
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Packet loss protection - Cisco Tutorial
From the course: Implementing Cisco Software-Defined Wan (SD-WAN) for your Enterprise and Cloud
Packet loss protection
- [Instructor] This lesson is going to focus on packet loss technologies. So, the first one is forward error correction, and so it's also referred to as FEC. Now, FEC works well across unreliable WAN links or packet loss because of bursty traffic. And so what we do is we are able to reduce retransmissions and improve throughput of TCP applications. This will work with UDP applications too, but does not include BFD traffic. Now, what happens is there's a parity packet that's going to match the transport and DSB value of the last packet in the block. And so we'll actually use four blocks of original source traffic and then we'll have one parity packet. And so to kind of visualize this, we'll go ahead and send one packet across the link, at which point it crosses and is able to reach the receiver. When we send the second packet, we'll see that that actually is able to be transmitted and makes its way to the receiver. And yet we have a third block that is transmitted but then falls in…
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