Configuring Congestion Management; Overview - HP A6600 Configuration Manual

Configuring congestion management

Overview

Congestion occurs on a link or node when traffic size exceeds the processing capability of the link or node.
It is typical of a statistical multiplexing network and can be caused by link failures, insufficient resources, and
various other causes.
Figure 14 Traffic congestion causes
100M
100M > 10M
(1)
Congestion may bring the following negative results:
Increased delay and jitter during packet transmission

Decreased network throughput and resource use efficiency

Network resource (memory in particular) exhaustion and even system breakdown

Congestion is unavoidable in switched networks or multiuser application environments. To improve the
service performance of your network, you must take measures to manage and control it.
One major issue congestion management deals with is how to define a resource dispatching policy to
prioritize packets for forwarding when congestion occurs.
Breaking through the single congestion management policy of FIFO for traditional IP routers, the router
provides the following technologies to offer powerful QoS capabilities, meeting different QoS requirements
of different applications.
If the burst traffic is too heavy, increase the queue length to make queue scheduling more accurate.
Figure 14 shows two common congestion scenarios:
100M
10M
10M
50M
(100M + 10M + 50M) > 100M
(2)
100M
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