Gartner Research

Quality of Service (QoS) Alternatives

Published: 11 December 2008

ID: G00204031

Analyst(s): Eric Siegel

Summary

Vendor marketing departments claim that every switch, router, access point, service provider, and optimization appliance in a modern network must include sophisticated, multi-level quality of service (QoS) technologies. The resulting complexity can be overwhelming; the costs can be huge; and in some cases QoS doesn't help much, if at all. In this Methodologies and Best Practices document, Senior Analyst Eric Siegel looks at the real issues behind QoS. Do you actually need it? And when are alternative strategies better?

Table Of Contents

Introduction

The Problems of Complex QoS

  • Classification Issues
  • Resource Allocation Issues
  • Questionable Justifications for Complex QoS

Alternatives to Complex QoS

  • A Few Low-Performance Access Links
  • A Few High-Sensitivity Applications
  • QoS on Multiple Backbones or Service Provider Networks
  • Bandwidth Saturation
  • Problems with Performance-Sensitive Protocols
  • VoIP
  • Voice over Wireless LAN

Summary Recommendations

Conclusion

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