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CONGESTION MANAGEMENT
When configuring congestion management, go to these section for information
that you are interested in:
■ “Overview” on page 877
■ “Congestion Management Policy” on page 877
■ “Configuring an SP Queue” on page 879
■ “Configuring a WRR Queue” on page 880
■ “Configuring SP+WRR Queues” on page 881
■ “Displaying and Maintaining Congestion Management” on page 882
Overview When the rate at which the packets arrive is higher than the rate at which the
packets are transmitted on an interface, congestion occurs on this interface. If
there is not enough storage space to store these packets, parts of them will be
lost. Packet loss may cause the transmitting device to retransmit the packets
because the lost packets time out, which causes a malicious cycle.
The core of congestion management is how to schedule the resources and
determine the sequence of forwarding packets when congestion occurs.
Congestion
Management Policy
Queuing technology is generally adopted to solve the congestion problem. The
queuing technology is to classify the traffic according to a specified
queue-scheduling algorithm and then use the specified priority algorithm to
forward the traffic. Each queuing algorithm is used to solve specific network traffic
problems and affects the parameters such as bandwidth allocation, delay and
delay jitter.
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