Scaling Internet Routers Using Optics
by Isaac Keslassy, Shang-Tse Chuang, Kyoungsik Yu, David Miller, Mark Horowitz, Olav Solgaard, Nick McKeown
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| type: | misc | | publisher: | ACM | | year: | 2003 | | pages: | 189--200 | | annote: | Isaac Keslassy (Stanford University); Shang-tse Chuang (Stanford University); Kyoungsik Yu (Stanford University); David Miller (Stanford University); Mark Horowitz (Stanford University); Olav Solgaard (Stanford University); Nick Mckeown (Stanford University); | | editor: | Anja Feldmann and Martina Zitterbart and Jon Crowcroft and David Wetherall | | abstract: | Routers built around a single-stage crossbar and a centralized scheduler do not scale, and (in practice) do not provide the throughput guarantees that network operators need to make e#cient use of their expensive long-haul links. In this paper we consider how optics can be used to scale capacity and reduce power in a router. We start with the promising load-balanced switch architecture proposed by CS. Chang. This approach eliminates the scheduler, is scalable, and guarantees 100% throughput for a broad class of tra#c. But several problems need to be solved to make this architecture practical: (1) Packets can be mis-sequenced, (2) Pathological periodic tra#c patterns can make throughput arbitrarily small, (3) The architecture requires a rapidly configuring switch fabric, and (4) It does not work when linecards are missing or have failed. In this paper we solve each problem in turn, and describe new architectures that include our solutions. We motivate our work by designing a 100Tb/s packet-switched router arranged as 640 linecards, each operating at 160Gb/s. We describe two di#erent implementations based on technology available within the next three years. | | month: | dec # "~22 | | booktitle: | Proceedings of the {ACM} {SIGCOMM} 2003 Conference on Applications, Technologies, Architectures, and Protocols for Computer Communication, August 25-29 |
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