Per-flow fairness in routing devices operating with multiple physical-layer interfaces in which each active physical interface has an inherent transmission rate is disclosed for both normal and backlog conditions. A queuing module that is responsive to the transmission rates of the individual interfaces allocates transmission resources among interfaces and manages flows of incoming packets destined for transmission over different physical-layer interfaces. In the case of a backlog condition, flows are automatically delayed by an amount that depends on the priority of the flow. In other words, although traffic is limited during backlogged conditions, the limitation occurs in a manner consistent with weighting or other per-flow fairness criteria.
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