Chapter 6: Aggregate Route-Based IP Switching (ARIS)

Chapter 6: Aggregate Route-Based IP Switching (ARIS)

Overview

The ARIS proposal has much in common with Tag Switching, especially when one considers the core of each proposal: the handling of destination-based routing. They are much closer to each other than they are to any of the other label switching proposals. Like the inventors of Tag Switching, the ARIS team has submitted a large number of Internet drafts to the IETF, and these are the main source of information for this chapter.

There is no doubt that Tag Switching and ARIS were invented in parallel?the announcement of ARIS followed that of Tag Switching by only a few weeks and was reported to have been ready well beforehand. Both proposals rely on some ideas that had been published previously, such as the notion of threaded indices described by Varghese in 1995. The naming of ARIS, Aggregate Route-based IP Switching, suggests something about its origins: unlike Ipsilon?s IP Switching, ARIS binds labels to aggregate routes (or groups of address prefixes), rather than to flows.

There are many significant differences between ARIS and Tag Switching in spite of their architectural similarity. We will discuss these differences and their impact in Chapter 7 . In this chapter, we begin with an overview of what functionality ARIS provides and how it works. We then describe how ARIS deals with both ATM and shared medial LAN links. Finally, we examine the details of the ARIS protocol, which provides the label binding capability for this approach. In some...

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Switching in IP Networks: IP Switching, Tag Switching, & Related Technologies

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Chapter 6: Aggregate Route-Based IP Switching (ARIS)

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