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Reliable control protocol for crossbar arbitration

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3 Author(s)
Minkenberg, C. ; Zurich Res. Lab., IBM Res. GrnbH, Zurich, Switzerland ; Abel, F. ; Gusat, M.

We describe an incremental request-grant protocol between line cards comprising virtual output queues and a central arbitration unit in a crossbar-based packet switch. Moreover, we introduce a method to make this protocol reliable in the presence of transmission errors that might lead to permanent inconsistency of the queue state information maintained by the arbiter. The protocol employs a "census" mechanism that travels the round-trip distance from line card to arbiter and back. We prove that it detects any inconsistency as well as its precise magnitude, enabling immediate corrective action.

Published in:

Communications Letters, IEEE  (Volume:9 ,  Issue: 2 )

Date of Publication:

Feb. 2005

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