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Source-specific multicast
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<p>Source-specific multicast (SSM) is a method of delivering <a href="/facts/Multicast/D9IspSfl">multicast</a> packets in which the only packets that are delivered to a receiver are those originating from a specific source address requested by the receiver. By so limiting the source, SSM reduces demands on the network and improves security. </p><p>SSM requires that the receiver specify the source address and explicitly excludes the use of the (*,G) join for all multicast groups in RFC 3376, which is possible only in IPv4's <a href="/facts/IGMPv3/MEzn1aTF">IGMPv3</a> and IPv6's <a href="/facts/Multicast_Listener_Discovery/QkUhWfn4">MLDv2</a>. </p>