HP 6125XLG R2306-HP 6125XLG Blade Switch ACL and QoS Configuration Guide - Page 49

Configuring congestion management, Overview, Impacts and countermeasures, Congestion management

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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. Impacts and countermeasures Figure 12 shows two typical congestion scenarios. Figure 12 Traffic congestion scenarios Congestion can introduce 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 and multi-user application environments. To improve the service performance of your network, implement congestion management policies. For example, congestion management defines a resource dispatching policy to prioritize packets for forwarding when congestion occurs. Congestion management techniques Congestion management uses queuing and scheduling algorithms to classify and sort traffic leaving a port. The switch supports the following congestion management techniques. SP queuing SP queuing is designed for mission-critical applications that require preferential service to reduce the response delay when congestion occurs. 43

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43
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.
Impacts and countermeasures
Figure 12
shows two typical congestion scenarios.
Figure 12
Traffic congestion scenarios
Congestion can introduce 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 and multi-user application environments. To improve the
service performance of your network, implement congestion management policies.
For example, congestion management defines a resource dispatching policy to prioritize packets for
forwarding when congestion occurs.
Congestion management techniques
Congestion management uses queuing and scheduling algorithms to classify and sort traffic leaving a
port.
The switch supports the following congestion management techniques.
SP queuing
SP queuing is designed for mission-critical applications that require preferential service to reduce the
response delay when congestion occurs.