The Integrated Services (IntServ) model is an architecture that offers guaranteed quality of service (QoS) end to end over the network. The key components of IntServ are Resource Reservation Protocol (RSVP) and Call Admission Control (CAC). This lesson describes the various aspects of the IntServ model and how it uses RSVP.


Upon completing this lesson, you will be able to describe IntServ and explain how it can be used to implement QoS in the network. This ability includes being able to meet these objectives:

■ Explain the key features of the IntServ model for QoS

■ Describe the IntServ model component, RSVP, and its function

■ Explain how the IntServ model integrates into enterprise networks

Integrated Services Model

This topic describes the purpose and function of the IntServ model.

IntServ Model

IntServ provides end-to-end QoS service for applications.

RSVP mechanism is used to provision end-to-end QoS treatment.

CAC is used through the network to ensure resource availability.

IntServ is an architecture for providing end-to-end QoS. The IntServ solution allows end stations to make requests upon the network. The network participates in this QoS scheme by either reserving or not reserving network resources for the requesting end station. The IntServ architecture provides a way to guarantee network quality levels by specifically reserving services and controlling the load of traffic on devices to provide the guaranteed service requirements.

The IntServ module uses a CAC component and a policy control component to manage requests for reservations. In other words, these components are used by RSVP-enabled routers to determine whether there are enough resources to support the reservation request and whether the host requesting the reservation can be granted a reservation.

RSVP supports the following messages:

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