The PGM Reliable Multicast Protocol
PragmaticGeneralMulticast(PGM)isareliablemulticasttransportprotocolthatrunsoverabesteffortdatagramservice,suchasIPmulticast.PGMobtainsscalabilityviahierarchy,forwarderrorcorrection,NAK(negativeacknowledgement)elimination,andNAKsuppression.ItemploysanovelpollingschemeforNAKdelaytuningto
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比较清楚，还不错。