Summary of Queuing Concepts

For the remainder of this chapter, queuing tools are compared based on the six general points listed in this section. Figure 4-7 outlines these points in the same sequence that each point is listed in the upcoming sections on each queuing tool.

Figure 4-7 Six Comparison Points for IOS Queuing Tools

1) Classification

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Dropped

3) Maximum Number of Queues

4) Maximum Queue Length

6) Scheduler Logic

3) Maximum Number of Queues

4) Maximum Queue Length

6) Scheduler Logic

Dropped

Scheduling gets the most attention when network engineers choose which queuing tool to use for a particular application. However, the other components of queuing are important as well. If the classification part of a queuing tool cannot classify the traffic as defined in the QoS policy for the network, for instance, either the policy must be changed or another tool must be used. For instance, PQ and CQ cannot take direct advantage of network-based application recognition (NBAR), but CBWFQ and LLQ can. In addition, some queuing tools allow a drop policy for each queue, which becomes particularly important when voice and video compete with data traffic in a converged network.

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