This Counter32 object counts good packets transmitted by a port that were directed to a multicast address, excluding errored multicasts and broadcast traffic. An admin verifying that multicast traffic, such as video streaming or service discovery, is reaching the correct downstream ports checks this counter for expected growth on those specific interfaces. For example, an admin troubleshooting a multicast video stream that isn't reaching a display would check whether this counter is incrementing on the port connected to that display.