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Achieving stability in networks of input-queued switches

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2 Author(s)
Andrews, M. ; Bell Labs., Murray Hill, NJ, USA ; Zhang, L.

Recent research has generated many interesting results on scheduling input-queued switches. However, most of this work focuses on a single switch in isolation. In this paper we study the problem of scheduling a network of input-queued switches. We consider the longest-queue-first and longest-port-first protocols that are stable for a single switch and show that they can be unstable even for a fixed traffic pattern in a simple network of eight input-queued switches. Moreover, this result holds regardless of how the traffic sharing the same port-pair is scheduled at each switch. On the positive side we present a protocol, longest-in-network, that is stable in networks of input-queued switches. This result holds even if the traffic pattern is allowed to change over time

Published in:

INFOCOM 2001. Twentieth Annual Joint Conference of the IEEE Computer and Communications Societies. Proceedings. IEEE  (Volume:3 )

Date of Conference:

2001

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