Do AR series routers support forwarding packets by multicast MAC addresses

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No, AR series routers do not support forwarding packets by multicast MAC addresses.

Other related questions:
Do AR series routers support packet forwarding based on multicast MAC addresses
AR series routers do not support packet forwarding based on multicast MAC addresses.

Does an AR learn the source MAC address of multicast packets
The AR learns MAC addresses of received multicast packets.

Which multicast protocols do AR series routers support
In earlier versions of V200R005C00, Huawei AR series routers support the following multicast protocols: - MSDP - PIM-SM - PIM-DM - IGMP - IGMP snooping and MLD snooping Note: AR150&AR200 series routers and AR1200 series routers do not support IGMP snooping or MLD snooping. In V200R005C00 and later versions, Huawei AR series routers support the following multicast protocols: MSDP - PIM-SM - PIM-SM (IPv6) - PIM-DM - PIM-DM (IPv6) - IGMP - MLD - IGMP snooping and MLD snooping Note: AR150&AR200 series routers and AR1200 series routers do not support IGMP snooping or MLD snooping.

Do S series switches support static multicast MAC addresses
S series switches (except the S1700) support static multicast MAC addresses in V100R006 and later versions. However, the support for this function varies depending on switch models. - S2700SI/S2700EI: not supported - S3700SI/S3700EI: not supported - S5710-C-LI: not supported - S5700SI: supported in V200R003 and later versions

Which status do MSTP interfaces of an AR router have and how do they process packets
MSTP interface status: - Forwarding: In this state, an interface forwards user traffic. Only the root interface or a specified interface can be in this state. - Learning: This is a transitional state. In this state, a switch will build a MAC address table according to the user traffic it receives (but not forward the user traffic). That is why this state is referred to as a learning state. - Discarding: In this state, an interface blocks packets and does not learn MAC addresses.

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