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Cisco IOS™ 12.0 Quality of Service by Cisco Systems, Inc.

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Chapter 5. Congestion Management Overview

Congestion management features allow you to control congestion by determining the order in which packets are transmitted out an interface based on priorities assigned to those packets. Congestion management entails the creation of queues, assignment of packets to those queues based on the packet's classification, and scheduling of the packets in a queue for transmission. The congestion management QoS feature offers four types of queuing protocols, each allowing you to specify creation of a different number of queues, which affords greater or lesser degrees of differentiation of traffic and the order in which that traffic is transmitted.

During periods with light traffic, that is, when no congestion exists, ...

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