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Implementing Cisco Networking Solutions by Harpreet Singh

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The differentiated services model

The differentiated services model, more commonly referred to as the DiffServ model, is a more scalable model compared to the IntServ model. This model uses aggregate flows rather than individual flows for prioritizing across the network, and uses a hop-by-hop approach for QoS, rather than an end-to-end approach.

The DiffServ architecture is composed of a number of functional elements implemented in network nodes. These include a small set of per-hop forwarding behaviors, packet classification functions, and traffic conditioning functions, including metering, marking, shaping, and policing. The DiffServ architecture achieves scalability by implementing complex classification and conditioning functions only ...

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