One such scheme, proposed by Cisco, is PGM (originally Pretty Good Multicasting, but changed for trademark reasons to Pragmatic General Multicast), documented in RFC 3208.
Takim systemem, zaproponowanym przez Cisco, jest PGM (pierwotnie "Pretty Good Multicasting", ale zmieniony z powodów znaku towarowego na Pragmatic General Multicast), udokumentowany w RFC 3208 ↓.