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When an MSDP peer receives an SA message, it determines if there are any group members within the
domain interested in any of the advertised sources. If there are, the receiving RP sends a join message to
the originating RP, creating a shortest path tree (SPT) to the source.
Figure 85. Multicast Source Discovery Protocol (MSDP)
Multicast Source Discovery Protocol (MSDP)
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