This object stores the lower 32 bits of a 64-bit rate limit value that controls the maximum number of multicast packets per second the equipment will forward on a specific traffic flow from access-to-network direction; when set to zero, all multicast frames are dropped. It is paired with a high-order 32-bit register to specify rates beyond 4 billion packets per second. Network administrators use this to enforce multicast bandwidth constraints and prevent multicast-based denial-of-service attacks.