QOS-Enabled Networks: Tools and Foundations (Wiley Series in by Miguel Barreiros, Peter Lundqvist

By Miguel Barreiros, Peter Lundqvist

Print ISBN: 9780470686973 (hb)
ePDF ISBN: 9780470976807
oBook ISBN: 9780470976814
ePub ISBN: 9780470976746

Overview
With a foreword via Kannan Kothandaraman

"This is the 1st e-book approximately QOS that i really loved analyzing accurately as the authors inquisitive about real-life QoS and never in educational discussions approximately it."
Per Nihlen, IP community supervisor, NORDUnet

The new authoritative, useful advisor to providing QOS guarantees

This new benchmark in caliber of provider (QOS) research is written by way of specialists within the box who take care of QOS predicaments on a daily basis. The authors not just offer a lucid figuring out of recent conception of QOS mechanisms in packet networks yet the best way to practice them in perform. moreover, they element the QOS administration beneficial properties present in smooth routers utilized by net carrier prone (ISPs) and massive firm businesses and networks, all to be able to let community managers and engineers to configure creation networks with a high quality of carrier warrantly. The book's concentrate on addressing community habit ("real effects") in terms of the configuration of community parts (routers and switches), is either clean and insightful.

QOS-Enabled Networks includes updated insurance of:

QOS mechanisms in packet networks and the way to use them in practice
QOS administration gains now universal in modern day routers
How community habit is said to configuration of community elements
Layer 2 VPN and QOS
QOS in cellular LTE networks

QOS-Enabled Networks is a useful consultant for networking engineers desiring to supply QOS companies for carrier companies, ISPs and big corporations, in addition to for community layout and operations engineers.

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Sample text

Rather, it is usually the sub-block of the policing tool that is responsible for measuring the traffic input rate. The policing building block as a whole applies predefined actions to each different color. 3 The Policer Tool The policer tool is responsible for ensuring that traffic conforms to a defined rate called the bandwidth limit. 4. The behavior of discarding excess traffic is also called hard policing. However, several other actions are possible. For example, the excess traffic can be accepted, but marked differently so it can be differentiated inside the router, a behavior commonly called soft policing.

However, we leave this topic for Chapter 6, in which we introduce the use of the token bucket concept to implement the policer function. In a scenario of linked meter and policer tools, the only difference is that the next step in the chain of meter and policer tool receives a packet that is already colored. This color provides an extra input parameter. g. from green to yellow), or lowered. 4 The Shaper Function The shaper function causes a traffic flow to conform to a bandwidth value referred to as the shaping rate.

As per the defined requirements, the policer drops the red packet and transmits all the others. The result is that black packet 3 and white packet 3 are discarded. Now moving to the egress interface, packets are placed into the egress queues, with black packets going to queue 1 and white packets to queue 2. We assume that because of the current queue fill levels, the dropper associated with each queue allows the packets to be put into the queues. The requirements state that the scheduler should prioritize queue 1.

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