Traffic Management is the key feature of ATM that distinguishes it from current networking protocols and makes it suitable for deployment in high-speed networks and for providing performance guarantees in an integrated environment.

ATM Forum has developed three different service categories for data: Available Bit Rate (ABR) service using explicit feedback, Unspecified Bit Rate (UBR) with no best effort (no guarantees), and Guaranteed Frame Rate (GFR) with minimum throughput guarantees.

Issues in performance of TCP/IP over each of these three services will be presented. Ways to improve the performance will also be discussed. In case of GFR, design issues related to buffering and queueing will be described.

Quality of service in IP is being provided with Integrated Services, RSVP, Differentiated Services, and MPLS. Issues with these approaches will also be discussed.

This talk covers the following topics:

• TCP over ATM using ABR, UBR, and GFR Services and QoS over IP Issues
• Why ATM?
• Old House vs New House
• Internet Protocols over ABR vs UBR?
• ABR vs UBR
• Improving TCP over UBR
• Policies: Results
• Guaranteed Rate Service
• GFR: Results
• Differential Fair Buffer Allocation
• Quality of Service (QoS)
• Integrated Services and RSVP
• After
• Problems with RSVP and Integrated Services
• Differentiated Services
• Expedited Forwarding
• Assured Forwarding
• Problems with DiffServ
• Multiprotocol Label Switching
• Traffic Engineering Using MPLS
• Summary

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