Description: Configure a MVR port of the designated MVR VLAN as one of the following roles: Inactive, Source or Receiver. An inactive port does not participate MVR operations. Configure uplink ports that receive and send multicast data as a source port, and multicast subscribers cannot be directly connected to source ports. Configure a port as a receiver port if it is a subscriber port and should only receive multicast data, and a receiver port does not receive data unless it becomes a member of the multicast group by issuing IGMP/MLD control messages. Be Caution: MVR source ports are not recommended to be overlapped with management VLAN ports.