Pragmatic General Multicast

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Pragmatic General Multicast (PGM) is a reliable multicast transport protocol.

[edit] Overview

Reliable means in this case that the receiver of a multicast stream can detect if all packets involved in this stream were actually received and which packets were not received. This means PGM cannot guarantee delivery. Instead best-effort delivery and loss-detection are implemented.

PGM is an IETF experimental protocol. It is not yet a standard.

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