Why does a Layer 3 multicast forwarding entry contain a loopback inbound interface

When the source IP address of multicast data packets is the same as the IP address of the VLANIF interface on the source DR, the corresponding Layer 3 multicast forwarding entry contains a loopback inbound interface. To solve this problem, change the source IP address of multicast data packets. Ensure that the source IP address is on the same network segment as the IP address of VLANIF interface, but is different from the IP address of VLANIF interface.

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