This read-write bitmask defines which ports should statically receive traffic for a specific IPv4 multicast group entry, independent of any dynamic IGMP learning. An administrator uses this to guarantee a multicast stream always reaches certain ports, such as a monitoring or recording device that never sends IGMP joins. For example, setting rlBrgStaticIpMulticastFrwPorts to include a network recorder's port ensures that device always receives a security-camera multicast feed even if it never issues an IGMP join.