Chapter 6. Buffer Management

  1. H. Jonathan Chao Ph.D.1 and
  2. Xiaolei Guo Ph.D.2

Published Online: 12 FEB 2002

DOI: 10.1002/0471224391.ch6

Quality of Service Control in High-Speed Networks

Quality of Service Control in High-Speed Networks

How to Cite

Chao, H. J. and Guo, X. (2001) Buffer Management, in Quality of Service Control in High-Speed Networks, John Wiley & Sons, Inc., New York, USA. doi: 10.1002/0471224391.ch6

Author Information

  1. 1

    Polytechnic University, Brooklyn, New York, USA

  2. 2

    INTEC Systems, Manalapan, New Jersey, USA

Publication History

  1. Published Online: 12 FEB 2002
  2. Published Print: 1 NOV 2001

ISBN Information

Print ISBN: 9780471003977

Online ISBN: 9780471224396



  • buffer management;
  • congestion control;
  • buffer sharing;
  • loss priority;
  • push-out;
  • squeeze-out;
  • nested threshold;
  • expelling;
  • partial packet discard (PPD);
  • early packet discard (EPD);
  • early selective packet discard (ESPD);
  • self-calibrating push-out (SCP);
  • dynamic threshold;
  • tail drop;
  • drop-on-full;
  • random early detection (RED);
  • differential dropping (RIO);
  • fair RED (FRED);
  • stabilized RED (SRED);
  • longest queue drop (LQD);
  • approximate LQD (ALQD)


Buffer management is the strategy for deciding when and how to discard packets to avoid network congestion. Its performance can be measured in terms of its ability to control traffic fairly and efficiently during periods of congestion. Typically, packet discard decisions are made either upon the arrival of a new packet, or at the onset of congestion, when currently stored packets may be discarded to accommodate a new, higher-priority packet. Chapter 6 describes some buffer management mechanisms for ATM networks and the Internet, respectively.