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Summary: Towards Coordinated Interdomain Traffic Engineering
Ratul Mahajan
David Wetherall
Thomas Anderson
Abstract We argue that today's ad hoc inter-domain
traffic engineering techniques be replaced with an architec-
ture that is based on explicit coordination between ISPs. With
explicit coordination, ISPs exchange information about their
traffic and routing options, and all ISPs impacted by a po-
tential routing change negotiate the actual change. This in-
creases efficiency because it allows ISPs to find "win-win"
routing outcomes that benefit both relative to routing without
coordination; one ISP need not guess the policies of others to
successfully engineer its own network. It also offers greater
stability because it makes resource policy conflicts visible
before routing changes uncover them, allowing them to be
resolved and avoiding inadvertent violations. We sketch the
building blocks of such an architecture, and use simulation
to show it has the potential to yield significant cost benefits.
1. INTRODUCTION
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