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UFO: A Resilient Layered Routing Architecture

Report ID:
May 2007
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Conventional wisdom has held that routing protocols cannot achieve
both scalability and high availability. Despite scaling rather well,
today's Internet routing system does not react quickly to changing
network conditions. Overlay networks, on the other hand, can respond
quickly to changing network conditions, but their reliance on
aggressive probing does not scale to large topologies. This paper
presents an Underlay Fused with Overlays (UFO), which achieves the
best of both worlds by providing router support for overlay routing
mechanisms. UFO comprises two changes to existing routers: (i)
data-plane support for deflecting packets at the behest of the overlay
and (ii) explicit notification about significant changes in network
conditions. We discuss how these two mechanisms facilitate the
scalable deployment of overlay routing mechanisms at the network

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