In what situation does an S series switch considers that Layer 3 multicast is enabled in a VLAN

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An S series switch considers that Layer 3 multicast is enabled in a VLAN when the corresponding VLANIF interface is Up at the physical layer and link layer, and one of the following conditions are met:
- Protocol Independent Multicast (PIM) is enabled on the VLANIF interface.
The Internet Group Management Protocol (IGMP) is enabled on the VLANIF interface.
An IGMP static multicast group is configured on the VLANIF interface.

Other related questions:
How does an S series switch age Layer 3 multicast entries
PIM deletes a Layer 3 multicast entry when the following conditions are met: - No traffic matches the entry. The multicast FIB management module counts packets matching each Layer 3 multicast entry. If no packet matches an entry within 210 seconds, the multicast FIB management module sends an entry inactive message to the PIM module. - The outbound interface list of the entry does not contain any outbound interface learned from PIM Join messages or PIM Prune messages. The outbound interfaces learned from IGMP on the designated router (DR) do not affect aging of Layer 3 multicast entries. If all the preceding conditions are met, PIM considers the entry invalid and deletes it.

Do S series switches support the Layer 3 multicast function
To achieve multicast forwarding of video services on Layer 3 networks, you need to configure the Layer 3 multicast function on switches. The Layer 3 multicast function requires two multicast protocols as follows: - Internet Group Management Protocol (IGMP): It is used to establish and maintain multicast group memberships between receiver hosts and directly connected multicast routers. - Protocol Independent Multicast (PIM): It is used to obtain multicast requirements of receiver hosts, generate multicast routing entries, and set up multicast forwarding paths. IGMP and PIM are supported by Huawei S series modular switches, and Sx7 series fixed switches including the S3700EI, S3700HI, S5700EI, S5710EI, S5720EI, S5700HI, S5710HI, S5720SI, S5720S-SI, S5720HI, S6700EI, S6720EI and S6720S-EI.

In what situation can multicast-triggered authentication be enabled
If port-based 802.1x authentication is configured on a port, the function of triggering authentication by multicast packets is automatically enabled. This function is used for the clients that cannot send EAPOL-Start packets initiatively. If a guest VLAN is configured and the configuration takes effect, the port is added to the guest VLAN after the attempts to trigger authentication by multicast packets fail six times. Then multicast-triggered authentication is disabled temporarily. In port-based 802.1x authentication mode, multicast-triggered authentication is enabled again when the user on the port goes offline. If the port has been Down for more than 10 seconds, multicast-triggered authentication is enabled again when the port becomes Up.

Can an S series switch accurately forward multicast data packets if only Layer 3 multicast is configured
For S series switches, Layer 3 multicast protocols can identify only Layer 3 VLANIF interfaces. If only Layer 3 multicast is configured and Layer 2 multicast is not enabled, multicast data is replicated on a VLANIF interface and broadcast in the corresponding VLAN, but cannot be forwarded to an accurate physical interface. When Layer 2 multicast is enabled in the VLAN corresponding to the VLANIF interface, multicast data can be accurately forwarded through a Layer 2 interface.

IP address configuration on S series switch
An S series switch, except S1700, supports primary and sub IP addresses on interfaces. Each Layer 3 interface can have multiple IP addresses, including one primary IP addresses and multiple sub IP addresses. (Note: Sub IP addresses become invalid when the primary address is deleted.)Each interface on the modular switch supports 255 sub IP addresses, and each interface on the fixed switch supports 8 sub IP addresses. For example, configure a primary IP address 10.1.0.1 and a sub IP address 10.2.0.1 for VLANIF10, with subnet mask 255.255.255.0. [HUAWEI] interface vlanif 10 [HUAWEI-Vlanif10] ip address 10.1.0.1 255.255.255.0 [HUAWEI-Vlanif10] ip address 10.2.0.1 255.255.255.0 sub (Note: After IP addresses are configured for a VLANIF interface, the clients connected to the switch use one of the IP addresses as gateway address. After sub IP addresses are configured, users can change them as required, but the new IP addresses must be on the same subnet as the primary or one sub IP address; otherwise, the subnets cannot communicate with each other.)For most models in V200R005C00 and later versions, run the undo portswitch command to switch a Layer 2 interface to a Layer 3 interface, and then configure an IP address for the interface. For example, configure a primary IP address 10.1.0.1 and a sub IP address 10.2.0.1 for GE1/0/1, with subnet mask 255.255.255.0. [HUAWEI] interface gigabitethernet 1/0/1 [HUAWEI-GigabitEthernet1/0/1] undo portswitch [HUAWEI-GigabitEthernet1/0/1] ip address 10.1.0.1 255.255.255.0 [HUAWEI-GigabitEthernet1/0/1] ip address 10.2.0.1 255.255.255.0 sub

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