The animated TECHTip Tutorial is available here.

SSM [Source Specific Multicast] is a single-source-rooted distribution tree with no RP [Rendezvous Points] using PIM [Protocol Independent Multicasting] and IGMP [Internet Group Management Protocol]. Receivers are explicitly-joined existing members which reduces complexity, billing, security, etc.

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[tags]pim,ssm,source specific multicasting,igmp,internet group management protocol,rendezvous point,protocol independent multicasting[/tags]