In multicast forwarding, each packet in a stream is transmitted once by a source and replicated by the infrastructure to efficiently reach an arbitrary number of recipients. This introduces a number of challenges not typically of concern when dealing with strictly unicast traffic. The fundamental difference is that, while unicast routing protocols are designed to forward traffic down the optimal path or paths to a destination, a multicast routing protocol must forward traffic down all paths, often replicating packets out multiple interfaces on the same router.
Read more at Packet Life.
I got to figure out how Stretch does those good looking topology diagram drawings. Strong work.
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