Abstract
Network congestion will increase as network speed increases. New control methods are needed, especially for handling "bursty" traffic expected in very high speed networks such as asynchronous transfer mode (ATM) networks. Users should have instant access to all available network bandwidth when they need it, while being assured that the chance of losing data in the presence of congestion will be negligible. At the same time, high network utilization must be achieved, and services requiting guaranteed performance must be accommodated. This paper discusses these issues and describes congestion control solutions under study at Harvard University and elsewhere. Motivations, theory, and experimental results are presented.
Following are the topics covered in this network management book.
- Why New Control Methods Are Needed
- Rapid Increase in Network Speeds
- Network Congestion Problem
- Inadequacy of Brute-Force Approach to Providing Large Buffers
- Use of Flow Control
- Control of Congestion for ATM Networks
- Technical Goals of Flow Control for Supporting ATM ABR Services
- Two Traffic Models
- A Flood Control Principle
- Credit-based Flow Control
- Credit Update Protocol
- Static vs. Adaptive Credit Control
- Adaptive Buffer Allocation
- Receiver-oriented Adaptive Buffer Allocation
- Rationale for Credit-based Flow Control
- Overallocation of Resources to Achieve High Efficiency
- Link-by-Link Flow Control to Increase Quality of Control
- Per-VC Queueing to Achieve a High Degree of Fairness
- Rate-based Flow Control
- CreditNet ATM Switch
- Experimental Network Configurations
- Measured Performance on CreditNet Experimental Switches
- Summary and Concluding Remarks
- Acknowledgments
- References
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