Why does an S series switch have a (*,G) entry and an (S,G) entry in the multicast routing table

It is normal that each multicast group has two entries on an S series switch. For ASM multicast services, the (*,G) entry is generated when a switch receives a user request to join the multicast group, and the (S,G) entry is generated when the switch receives multicast data packets for the multicast group. The outbound interface in the (S,G) entry is obtained from the (*,G) entry.

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