Why is no Layer 3 multicast forwarding entry generated on S series switches after users order multicast programs

The possible causes are as follows:
- No RP is configured on the PIM-SM network. In this case, configure static or dynamic RP.
- The route to the multicast source or RP is unreachable. In this case, configure a unicast routing protocol to enable the switch to learn the routes to the multicast source or RP.

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