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Special Edition Using TCP/IP, Second Edition by NIIT

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Differentiated Services

Although RSVP was an effective QoS implementation protocol, it was difficult to implement RSVP sessions on a large scale. RSVP implementations were router-intensive, which implied that the routers had to maintain state information, resource allocation, packet classification, packet scheduling, and policy control in addition to their usual datagram-routing services. Therefore, another method that used the existing IP network infrastructure to provide a simpler implementation of QoS was essential. This need necessitated the development of differentiated services as an alternative QoS implementation model.

Differentiated services use the Type of Service (ToS) field in the existing IP datagram framework to classify datagrams ...

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