Why does an S series switch receive much multicast traffic when IGMP snooping is not configured?

The destination address of these multicast data packets is a multicast group address, of which the MAC address entries cannot be learned on the Layer 2 switch. Therefore, the switch broadcasts the multicast data packets to all the interfaces in the same broadcast domain. All hosts in the broadcast domain will receive the multicast data packets, regardless of whether or not they are members of the multicast group. Much network bandwidth is occupied and multicast traffic is heavy.
IGMD snooping solves this preceding problem. With IGMP snooping configured, the Layer 2 switch listens to and analyzes IGMP packets exchanged between multicast users and the upstream router, and creates Layer 2 multicast forwarding entries accordingly. Multicast data packets are then forwarded based on the Layer 2 multicast forwarding entries, instead of being broadcast on the Layer 2 network.
Layer 2 multicast is irrelevant to the number of multicast sources. For S series switches excluding the S1700, to enable IGMP snooping in VLAN 10, perform the following configurations:
[HUAWEI] igmp-snooping enable //Enable IGMP snooping globally.
[HUAWEI] vlan 10
[HUAWEI-vlan10] igmp-snooping enable //Enable IGMP snooping in VLAN 10.

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