Which ports can be configured as VSI-based IGMP Snooping router ports?

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VLANIF interface, physical interface that has been switched to Layer 3 mode using the undo portswitch command.

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Configure IGMP snooping on the AR router
With IGMP snooping configured, the Layer 2 multicast device 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. This prevents the multicast data from being broadcast on the Layer 2 network. On an AR router, enable IGMP snooping in VLAN 10. The configuration is as follows: [HUAWEI] igmp-snooping enable //Enable IGMP snooping globally. [HUAWEI] vlan 10 command. [HUAWEI-vlan10] igmp-snooping enable //Enable IGMP snooping in VLAN 10.

IGMP snooping configuration on S series switch
With IGMP snooping configured, the switch listens to and analyzes IGMP packets exchanged between multicast users and the upstream router, and creates Layer 2 multicast forwarding entries based on IGMP packet information. Multicast data packets are then forwarded based on the Layer 2 multicast forwarding entries, instead of being broadcast on the Layer 2 network. For example, to enable IGMP snooping in VLAN 10 on an S series switch, except S1700, run the following commands: [HUAWEI] igmp-snooping enable //Enable IGMP snooping globally. [HUAWEI] vlan 10 [HUAWEI-vlan10] igmp-snooping enable //Enable IGMP snooping in the VLAN.

Difference between IGMP snooping and IGMP snooping proxy on an S series switch
IGMP snooping and IGMP snooping proxy have the same functions but different mechanisms. IGMP snooping obtains required information by listening to IGMP messages; IGMP snooping proxy intercepts and suppresses IGMP requests of terminal users, and then forwards the requests to the router. The Layer 2 network device with IGMP Snooping Proxy configured functions as a server on the user side. It periodically queries user information. On the network side, this switch functions as a client and reports user information after receiving query messages. Therefore, IGMP snooping proxy can not only suppress multicast packets on Layer 2 network, but also reduce the total number of protocol packets on the network. The proxy router is required for maintaining and calculating entry status changes, so the implementation is more complex and the cost is added.

Advantages of IGMP Snooping
When there are multicast services, IGMP Snooping used on Layer 2 devices brings the following advantages: Saves network bandwidth. Improves information security because packet services are independently forwarded using VLANs. Reduces interruption time of multicast services and enhances reliability because network topology changes can be sensed in a timely manner.

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