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.

Other related questions:
How to determine whether an S series switch is a Layer 2 or Layer 3 switch
All models of the S600, S1720, and S2700 are Layer 2 switches. All models of the S3700 and S6700 are Layer 3 switches. The S5700-LI, S5700S-LI, S5710-LI, S5720-LI, and S5720S-LI series are Layer 2 switches. The S5700-EI, S5700-SI, and S5700-HI series are Layer 3 switches. All models of the S9300, S7700, S9700, and S12700 are Layer 3 switches.

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 and a sub IP address for VLANIF10, with subnet mask [HUAWEI] interface vlanif 10 [HUAWEI-Vlanif10] ip address [HUAWEI-Vlanif10] ip address 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 and a sub IP address for GE1/0/1, with subnet mask [HUAWEI] interface gigabitethernet 1/0/1 [HUAWEI-GigabitEthernet1/0/1] undo portswitch [HUAWEI-GigabitEthernet1/0/1] ip address [HUAWEI-GigabitEthernet1/0/1] ip address sub

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.

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 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.

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