Can user B receive data of the multicast service ordered by user A on an S series switch

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After a Layer 2 device such as a switch receives multicast packets and IGMP snooping is not enabled in a VLAN, multicast packets are broadcast in the VLAN. This is because the MAC address entry corresponding to the multicast address cannot be learned in the VLAN and packets are processed as unknown ones.
When a Layer 2 device is connected to user A and user B in the same VLAN and IGMP snooping is not enabled in the VLAN, user B can receive data from the multicast source that user A orders. However, user B usually discards received multicast data packets because the corresponding multicast client software is not enabled.

Other related questions:
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.

Can a host receive data from multiple multicast sources after IGMP snooping is configured on an S series switch
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.

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.

Function of user ommdba
It is the user used to create the FusionInsight HD system database. This user is an operating system user generated on the management node and does not require a unified password. It cannot be used for remote login.

Whether the level of the local user of the S series switches affects data communication
S series switches (except S1700) configuring the local user level only affects the local user's login management of the device, and has no effect on data communication.

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