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QoS for IP/MPLS Networks by Santiago Alvarez

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Foreword

The phrase “IP QoS” was for many years considered an oxymoron. Indeed, much of the success of the IP architecture could be traced to its adoption of a “best effort” service model, enabling IP to run over just about any underlying network technology. Best effort service, however, is defined by a lack of assurance that packets will be delivered in a timely manner, or even delivered at all. Such a service model limits the potential of IP networks to support applications that demand timely packet delivery, such as interactive telephony and multimedia applications.

As far back as 1979, there were proposals to extend the IP service model to support applications with stronger QoS requirements. However, this remained a research topic until the ...

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