Switch fails in layer 2 multicast forwarding

Symptom

A switch fails to implement Layer 2 multicast forwarding.

MLD snooping is not enabled.

Enter the display current-configuration command to view the running status of MLD snooping.
If MLD snooping is not enabled, use the mld-snooping command to enable MLD snooping globally, and then use mld-snooping enable command to enable MLD snooping in VLAN view.
If MLD snooping is disabled only for the corresponding VLAN, just use the mld-snooping enable command in VLAN view to enable MLD snooping in the corresponding VLAN.

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