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5 The Differentiated Services (DiffServ) Architecture DiffServ was ratified as a series of IETF standards (RFCs) toward the end of 1998. The differentiated service approach to providing quality of service in networks employs a small, well-defined set of building blocks from which a variety of aggregate behaviors may be built. DSCP values are used to mark a packet to receive a particular forwarding treatment, or perhop behavior, at each network node. A common understanding of the use and interpretation of this bit pattern is required for interdomain use, multivendor interoperability, and consistent reasoning about expected aggregate behaviors in a network.

After the application is recognized, the network can invoke specific services for that particular application. NBAR currently works with QoS features to help ensure that the network bandwidth is best used to fulfill the objectives. This feature includes the ability to mark packets appropriately so that the network and the SP’s network can provide QoS from end to end—for example, if the network requires a fast response when the user passes a query for an order status in the corporate data warehouse hosted on an Oracle database server.

The received traffic will typically comply with the contract, give or take jitter introduced by elements in the network downstream of the policer. Sources with feedback-based congestion control mechanisms (for example, TCP) typically adapt rapidly to static policing, converging on a rate just below the policed sustained rate. 14 illustrates the use of a policer to enforce a contract for traffic entering an interface. In this illustration the policer is used to enforce a service contract at the network edge for all incoming traffic.

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