Congestion and Queuing

• Congestion can occur at any point in the network where there are points of speed mismatches, aggregation, or confluence.

• Queuing manages congestion to provide bandwidth and delay guarantees.

Congestion can occur anywhere within a network where speed mismatches (for example, a GigabitEthernet link feeding a FastEthernet link), aggregation (for example, multiple GigabitEthernet links feeding an upstream GigabitEthernet), or confluence (the flowing together of two or more traffic streams).

Queuing algorithms are used to manage congestion. Many algorithms have been designed to serve different needs. A well-designed queuing algorithm will provide some bandwidth and delay guarantees to priority traffic.

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