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protocol independent multicast sparse mode
comp., net.	稀疏模式独立组播协议
IT	稀疏模式独立于协议的多播
English thesaurus
Protocol Independent Multicast-Sparse Mode
IT, abbr.	PIM-SM (protocol, RFC 2117/2362, PIM, ACM, SM, Multicast); PIMSM (protocol, RFC 2117/2362, PIM, ACM, SM, Multicast)