This OID stores the upper 32 bits of the Excess Information Rate (EIR)—the maximum speed at which a network interface can send non-priority traffic after consuming its regular allowance. It defines a traffic limit for low-priority data on a network interface, allowing you to prioritize critical traffic during congestion. An operator sets this when configuring Quality of Service (QoS) policies to prevent bulk downloads from choking real-time applications like VoIP.