If the entity is performing IGMP snooping, set this field to 'true' to enable origination of periodic General Query messages. The source address to use on these Query messages is specified by mgmdRouterEntSnoopQrySrcAddrIp4 or mgmdRouterEntSnoopQrySrcAddrIp6. On a typical subnet, a multicast router originates periodic General Query messages. If there is no multicast router, periodic General Query messages must be originated by a snooping switch instead. If mgmdRouterInterfaceMrouterCfgd is set to 'always' for any interface, the entity does not originate periodic General Query messages and this field has no effect. Regardless of the value of this field, the entity originates General Query messages immediately after IGMP snooping starts/restarts running on the interface, in order to achieve faster convergence of group membership state. This start/restart can be triggered by administrative events (activation of the interface, or the entity) or network events (a layer 2 topology change, or recovery of a failed interface). If the entity is not performing IGMP snooping, this field has no effect.