This counts the number of received IGMP query messages the device discarded rather than processed, typically due to malformed content, an untrusted source, or some other validation failure. An admin seeing this counter climbing steadily, especially alongside the router-source-range filtering objects elsewhere in this MIB, should investigate whether a misconfigured or unauthorized device is repeatedly sending queries the device is correctly rejecting. A non-zero and growing value here, paired with a static or slowly-growing cienaCesMcastQueryMessagesRx, would suggest most incoming queries are actually being thrown away rather than processed.