This counter tracks multicast packets dropped because the destination multicast address is not configured to be forwarded. This distinguishes an intentional multicast filtering policy from a fault, so a climbing count here paired with a complaint about a missing multicast feed usually means the multicast address needs to be explicitly added to the router's forwarding list rather than indicating a hardware problem. If a new video channel is added to a multicast lineup at a given group address but the router's forwarding configuration wasn't updated, every packet for that address increments this counter instead of reaching the LAN.