Just to add to what Joseph said, source specific multicast (SSM) doesn't use RP either as the receiver already knows about the source and will send the joing directly to it (source tree rather than RP tree).
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We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...