A hierarchical congestion management system improves the performance of traffic through a communications system. In one embodiment of the invention, a first subset of thresholds is configured so as to guarantee the passage of a certain high-priority or other selected communications traffic. Further, a second subset of thresholds is configured to control interference among independent flows of traffic that are competing to pass through the system. As a result of these configurations, traffic flows that cause congestion at the output are isolated to prevent dropping other traffic, and high-priority traffic is ensured passage.
7813348 Methods, systems, and computer program products for killing prioritized packets using time-to-live values to prevent head-of-line blocking
* 8072887 Methods, systems, and computer program products for controlling enqueuing of packets in an aggregated queue including a plurality of virtual queues using backpressure messages from downstream queues
8867360 Method and apparatus for lossless behavior for multiple ports sharing a buffer pool
* 2013/0250,762 Method and apparatus for Lossless Behavior For Multiple Ports Sharing a Buffer Pool
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