2. The QOS Tools

  1. Miguel Barreiros1 and
  2. Peter Lundqvist2

Published Online: 20 DEC 2010

DOI: 10.1002/9780470976814.ch2

QOS-Enabled Networks: Tools and Foundations

QOS-Enabled Networks: Tools and Foundations

How to Cite

Barreiros, M. and Lundqvist, P. (2011) The QOS Tools, in QOS-Enabled Networks: Tools and Foundations, John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/9780470976814.ch2

Author Information

  1. 1

    Juniper Networks, Portugal

  2. 2

    Juniper Networks, Sweden

Publication History

  1. Published Online: 20 DEC 2010
  2. Published Print: 7 JAN 2011

ISBN Information

Print ISBN: 9780470686973

Online ISBN: 9780470976814



  • QOS tools;
  • QOS maturing and evolving, with new developments - features, being added;
  • fundamental QOS tools - QOS tool, simply a building block;
  • QOS building blocks, single router - part of a network in which QOS is implemented;
  • classifiers performing a task - analogous to an “identification” process;
  • basis of QOS - traffic differentiation, and concept of a class of service (CoS) fundamental to QoS operation;
  • scenario of N chain classifiers, next-in-chain classifier - receiving packets, already been classified;
  • policer tool, for ensuring - traffic conforming to a defined rate called bandwidth limit;
  • combining policer and metering tools;
  • delay and jitter insertion - two QoS tools, can insert delay, shaper and combination of queuing and scheduling


This chapter contains sections titled:

  • Classifiers and Classes of Service

  • Metering and Coloring – CIR/PIR Model

  • The Policer Tool

  • The Shaper Function

  • Comparing Policing and Shaping

  • Queue

  • The Scheduler

  • The Rewrite Tool

  • Example of Combining Tools

  • Delay and Jitter Insertion

  • Packet Loss

  • Conclusion

  • Reference