This counter tracks multicast packets dropped because the specific multicast group has been disabled from forwarding. This differs from cdd564DroppedPacketsFilteredMulticast in that it reflects a group that was explicitly disabled rather than one that was simply never enabled, so it's the counter to check when a previously-working multicast feed suddenly stops -- someone likely toggled that group off deliberately or by mistake. If an admin disables a legacy multicast group during a channel lineup change but a few set-top boxes are still subscribed to it, this counter will climb steadily as those devices' traffic continues to be dropped.