Contents
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Quality-of Service: Too little or too much?
Acknowledgements
What is QoS?
Issues in Supporting QoS
The Paradox of Technical Feasibility
What Has Happened to QoS?
How Do We Go About Finding An Answer?
Evolution of Memory
Evolution of Processing Capacity
Switching/Forwarding Cost and QoS Support
Bandwidth Cost and Availability
Some Initial Assessments
Sample Trade-off for Rate Guarantees
Aggregate vs Individual Guarantees
Some Preliminary Conclusions
Recurring Costs are Dominant
Cost of Signalling
Other Signalling Issues
QoS Routing - Cost Components
QoS Routing - Computational Cost
QoS Routing - Protocol Overhead
Trade-Off in QoS Routing
So Do We Need QoS Routing?
Traffic Growth - Sample Data
Traffic Growth vs Bandwidth Growth
More Preliminary Conclusions
Policy - Another Key Aspect of QoS Reality and Cost
Policy Enabled Networks A Scalable Infrastructure for QoS?
Policy Cost Issues
So Where Do We Stand?
So What Do We Do?
Some Promising Research Topics