How does the AR router restrict unauthorized multicast sources

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Run the source-policy { acl-number | acl-name acl-name } command in the PIM view to enable the AR router to filter multicast data packets based on sources or source groups so that unauthorized multicast sources are restricted.

Other related questions:
How do I restrict unauthorized multicast sources through configuration
To enable routers to filter multicast data packets based on the sources or source groups so that unauthorized multicast sources are restricted, run the source-policy { acl-number | acl-name acl-name } command in the protocol independent multicast (PIM) view.

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

Configure multicast on the AR router
For the AR router, the configuration roadmap is as follows: 1. Configure the Layer 3 multicast function on the Layer 3 network to implement multicast routing (supported by some AR models). a. Configure a unicast routing protocol to achieve unicast interworking. This is the prerequisite of multicast routing. b. Configure PIM-SM and configure a multicast traffic aggregation point as the rendezvous point (RP). c. Enable IGMP on interfaces of user gateways to learn multicast service requirements of users. PIM generates multicast routes based on IGMP group information and forwards multicast data to receiver network segments. 2. Configure Layer 2 multicast on the Layer 2 network to forward multicast data to Layer 2 outbound physical interfaces accurately. a. Enable IGMP snooping in a VLAN.

Is multicast enabled on the AR router by default
By default, the multicast function of the AR router is disabled.

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