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Dell EMC SmartFabric OS10 User Guide Release 10.5.1

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PIM-SSM

PIM-SSM uses source-based trees. A separate multicast distribution tree is built for each multicast source that sends data to a multicast group. Each multicast distribution tree has as its root node a router near the source. Sources send data directly to the root of the tree. PIM-SSM enables receivers to specify the source from which to receive data and the multicast group they want to join. The receiver identifies a multicast data stream using the source and group address pair (S, G) instead of the group address alone (*, G).

NOTE:
  • PIM-SSM requires receivers to support IGMP version 3.
  • The default PIM-SSM range is 232.0.0.0/8. The default range is always supported and the range can never be smaller than the default.
  • If the PIM-SSM group range overlaps with the multicast group range that the candidate RP advertises, the router chooses the RP learned from the BSR and creates (*, G) entries instead of (S, G) entries.

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