Deploying Advanced Quality of Service Features

As mentioned in Chapter 4, "Deploying Basic Quality of Service Features," queuing services, such as weighted fair queuing (WFQ), are important functions of the network to recognize and prioritize applications. However, queuing alone might not be sufficient for achieving quality of service (QoS) in all parts of the network. As an example, WFQ might suffice for most parts of the network, but not at the point where the network connects to the Internet—where a form of rate control is also needed.

This chapter explains the operation and deployment of three advanced services for QoS: Resource Reservation Protocol (RSVP), Random Early Detection (RED), and Committed Access Rate (CAR).

Building on the QoS concepts in Chapter 4, these enhanced services introduce subjects such as admission control, QoS signaling, global synchronization, and rate limiting.

As you read this chapter, you will notice an emphasis on the mechanics of the services (and the reasons they exist) rather than on the IOS configuration. This is because the configuration tasks are fairly short, and an explanation of each service's behavior is more important than the commands that activate them.

The main topics of this chapter are

• Resource Reservation Protocol

• Random Early Detection

• Committed Access Rate

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