This counts multicast packets dropped specifically because the corresponding IGMP multicast group was disabled. This is distinct from cdmipDroppedPacketsMulticast, which is about the satellite-to-Ethernet feature being off entirely, since this one instead points at a specific tracked group, per cdmipIgmpClientState, having been individually disabled while multicast traffic for it keeps arriving. Traffic for one specific multicast channel being consistently dropped, while other multicast channels flow normally, and this counter climbing in step, would point at that one particular group being disabled rather than a broader multicast configuration problem.