Riverbed Transport Streamlining

Transport Streamlining

Transport Streamlining enhances the performance of TCP-based applications by enhancing the way transport protocols behave on WANs, decreasing the number of TCP packets needed to transfer data by 65% to 98%. Transport Streamlining doesn't have the limitations of TCP because it adapts transmission characteristics such as window scale, loss handling, congestion notification, etc.

Transport Streamlining now supports the acceleration of encrypted SSL traffic (like HTTPS), therefore, even your secure business applications can take advantages from Riverbed's award-winning application acceleration.

For high-bandwidth WAN links (also known as "Long Fat Networks", or "LFNs") components of Transport Streamlining known as high speed TCP (HS-TCP) and Max-Speed TCP (MX-TCP) may be utilized which allows for greater bandwidth utilization, offering the capability to "fill the pipe" more effectively. MX-TCP also helps dealing with lossy network connections.

RiOS is architected to correspond to network conditions on-the-fly, responding to events such as congestion or packet loss without giving up the reliability and scalability that make TCP the de facto standard. With Transport Streamlining, enterprises can be certain that their networks are optimally transferring data.

Unlike products which may utilize one or two features designed to optimize TCP, RiOS uses both patented and industry-accepted features in order to fully maximize the power of TCP:

• Virtual Window Expansion
• Window Scaling
• Delayed and Selective Acknowledgments (RFC 2018)
• Explicit Congestion Notification (RFC 3168)
• Limited and Fast Re-Transmits (RFC 3042 and RFC 2582)
• Adaptive Initial Congestion Windows (RFC 3390)
• Slow Start with Congestion Avoidance (RFC 2581)
• Bandwidth Delay Control

MX-TCP vs. HS-TCP

Most terrestrial WANs have a very low natural packet loss rate, normally well under 0.1%, and often under 0.01%. Some enterprises may be dealing with lossy or dirty circuits however, so it is imperative that any WDS solution knows how to deal with both clean and lossy connections.

Features like HS-TCP allow for higher bandwidth utilization, on clean long fat network (LFN) circuits, because they ramp up faster and back off more slowly when any congestion or loss occurs. HS-TCP behaves like regular TCP when dealing with other traffic on the same connection it will back off so all senders can transmit on the link.

On lossy LFN circuits, or on clean LFN circuits where an administrator can guarantee a certain amount of bandwidth, MX-TCP is a better solution. MX-TCP will use 100% of an allocated amount of bandwidth until a transfer has been completed. It will not back off in the face of packet loss, it merely resends any lost packets.

Main Advantages:

• Eliminates 65% to 98% of TCP packets required to transfer data
• Accelerate encrypted (SSL) traffic like HTTPS
• Optimizes both low-bandwidth and high-bandwidth connections

Datasheets:

• RiOS Technical Overview

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