After controllable multicast configuration is complete on a device, the device receives Report messages that IGMPv2 hosts send to order data of multicast group G. However, the device does not generate Layer 2 multicast forwarding entries for the hosts.
If the Address field contains a multicast source address, the multicast-group command has specified both a group address and a source address when creating the controllable multicast group. The device checks the group address and source address in each received IGMP Report message. However, IGMPv2 Report messages do not contain a source address, so the check fails. Therefore, no Layer 2 multicast forwarding entry can be generated based on the IGMPv2 Report messages.