H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 42)

35
Congestion management configuration
This chapter includes these sections:
• Congestion management overview
• Congestion management configuration approaches
• Congestion management
NOTE:
•
The term "switch" or "device" in this chapter refers to the switching engine on a WX3000E
wired-wireless switch.
• The WX3000E series comprises WX3024E and WX3010E wired-wireless switches.
• The port numbers in this chapter are for illustration only.
Congestion management overview
Causes, impacts, and countermeasures
Network congestion degrades service quality on a traditional network. Congestion is a situation where
the forwarding rate decreases due to insufficient resources, resulting in extra delay.
Congestion is more likely to occur in complex packet switching circumstances.
Figure 9 shows two
common cases:
Figure 9 Traffic congestion causes
Congestion can 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 and multi-user application environments. To improve the
service performance of your network, you must take some proper measures to address the congestion
issues.
The key to congestion management is how to define a dispatching policy for resources to decide the
order of forwarding packets when congestion occurs.