Switch fails in layer 2 multicast forwarding

Symptom

A switch fails to implement Layer 2 multicast forwarding.

IGMP snooping is not enabled.

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

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