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End-to-End QoS Network Design: Quality of Service for Rich-Media & Cloud Networks, Second Edition by Kenneth Briley Jr., Robert Barton, Christina Hattingh, Tim Szigeti

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Chapter 29. Branch Router (Cisco ISR G2) QoS Design

Like the WAN aggregator, the primary quality of service (QoS) role of the branch router is to manage the inevitable congestion caused by the major reduction in link speeds from the LAN to the WAN, while minimizing packet loss and jitter.

A secondary role of these routers may be to perform deep packet inspection (DPI) for ingress application classification. DPI is especially relevant on today’s networks because of the thousands of applications that run over HTTP, which, from a Layer 4 perspective all look the same (as TCP traffic over port 80). It is only by looking deeper into the packet and identifying Layer 7 parameters that distinctions can be made for these flows. There are limits to DPI ...

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