from Part III - Protocols and practice
Published online by Cambridge University Press: 05 October 2012
Although there are many reasons for the adoption of a multi-path routing paradigm in the Internet, nowadays the required multi-path support is far from universal. It is mostly limited to some domains that rely on IGP features to improve load distribution in their internal infrastructure or some multi-homed parties that base their load balance on traffic engineering. This chapter explains the motivations for a multi-path routing Internet scheme, commenting on the existing alternatives, and detailing two new proposals. Part of this work has been done within the framework of the Trilogy research and development project, whose main objectives are also commented on in the chapter.
Introduction
Multi-path routing techniques enable routers to be aware of the different possible paths towards a particular destination so that they can make use of them according to certain restrictions. Since several next hops for the same destination prefix will be installed in the forwarding table, all of them can be used at the same time. Although multi-path routing has a lot of interesting properties that will be reviewed in Section 12.3, it is important to remark that in the current Internet the required multi-path routing support is far from universal. It is mostly limited to some domains that deploy multi-path routing capabilities relying on Intra-domain Gateway Protocol (IGP) features to improve the load distribution in their internal infrastructure and normally only allowing the usage of multiple paths if they all have the same cost.
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